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Ί / / Cj The Bulletin of The Canadian Association of Physicists Vol. 33 No. 3 Congress Issue 1977 Bulletin de l’Association canadienne des physiciens Vol. 33 no. 3 Numéro du Congrès 1977 I* Can— 1 Ρ μ «· mi Caw— J Third Troisième class classe 642 OTTAWA, ONT. M Notice to CAP Members Bring this free copy of the Congress Issue to the annual congress in Saskatoon: other copies will be available at $3.00 each. Avis aux membres de l’ACP Veuillez apporter cet exemplaire gratuit du programme au Congrès à Saskatoon. Des exemplaires supplémentaires se vendront à $3.00 chacun.
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  • Ί / / Cj

    The Bulletin ofThe Canadian Associationof PhysicistsVol. 33 No. 3 Congress Issue 1977 Bulletin del’Association canadienne des physiciens Vol. 33 no. 3 Numéro du Congrès 1977

    I *Can— 1 Ρμ « ·•mi Caw— J

    Third Troisième class classe

    642OTTAWA, ONT.

    M

    Notice to CAP MembersBring this free copy of the Congress Issue to the annual congress in Saskatoon: other copies will be available at $3.00 each.

    Avis aux membres de l ’ACPVeuillez apporter cet exemplaire gratuit du programme au Congrès à Saskatoon. Des exemplaires supplémentaires se vendront à $3.00 chacun.

  • NEW FROMTRACORNORTHERNLSI-11* MICROCOMPUTER BASED, MODULAR MCA

    SIGNAL INPUT MODULES AVAILABLE:■ Choice of three ADCs; 50, 100 or 200 MHz

    ■ Multiple input scalers (MCS)

    ■ Multi-input signal averaging/'digitizing

    ■ Preamplifier/amplifier

    ■ Detector high voltage supplies, 2KV or 5KV available

    ■ Multiplex/routers for multiple PHA inputs

    THE INNOVATIVE NEW TN-1 710 INCLUDESTHESE STANDARD FEATURES:■ Large 6.5" CRT display

    ■ Alphanumeric character generator

    ■ Log display plus Tracor Northern’s exclusive autoranging feature

    ■ Regions of interest with gross count integral and net integral above background

    ■ Unique bipolar or unipolar display

    ■ Cursor for region of interest and individual channel selection

    ■ LSI-11 microcomputer

    ■ Field expandable with extra memory and new function modules

    ■ Additive and subtractive transfer

    ■ X - Y analog outpui tc plotters or recorders

    ■ New modular chassis capable of housing a wide variety of ADC, scaling and averaging inputs plus many data processing and display options

    *LSI-11 is a registered trademark of the Digital Equipment Corp.

    DATA PROCESSING MODULES AVAILABLE:■ Energy and time calibration for PHA/MCS data

    ■ Data processing including smoothing, stripping, normalization, plus spectrum integration and differentiation

    ■ Automatic learn and operate of complex analysis sequences

    ■ Peak or region of interest ratio

    Many other input and processing modulesare planned to adapt the powerful TN-1710 tomeet your specific application.

    ^ V /i W ' u m & i ű í Í o i u . .I eltartaniosIn Canada : Contact Allan Crawford Associated Ltd.Ottaw a M ontreal Toronto Vanco uver613 8 29 9651 514 6 7 0 1212 416 6 7 8 1 500 6 04 9 8 0 4831

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    The Bulletin ofThe Canadian Associationof Physicists

    Vol. 33 No. 3 Congress Issue 1977

    / ] / 7 c s v / } a )Physics in Canada

    Bulletin del'Association canadienne des physiciens

    Vol. 33 no. 3Numéro du Congrès 1977

    La Physique au Canada

    EDITORIAL BOARD/COMITÉ DE RÉDACTIONR. L. Clarke Editor/Rédacteuren chef

    Associate Lditors/Rédacteurs AssociésMona L. Jento (managing/administration)Gilles Lamarche (textes français)

    1977 CAP Congress, General Information

    Congrès 1977, renseignements généraux

    Maps/Plan du Campus

    CAP Medallists 1977/Lauréats de l'ACP 1977

    CAP Prize Exam 1977/Examen de l'ACP 1977

    Future Congresses/Congrès futurs

    E. R. FortinAdvertising Fditor/Rédacteur à la Publicité

    J. E. HardyBook Review Editor/Rédacteur à la Critique des Livres

    E. VogtEditorial Address :English Copy:R. L. Clarke Physics Department Carleton University Ottawa. Ontario KIS 5B6

    Adresse de la Rédaction :Textes français :

    Gilles Lamarche Département de Physique

    Université d'Ottawa Ottawa, Ontario K IN 6N5

    Invited Speakers/Conférenciers invités

    Program Summary/Résumé du programme

    Congress Program/Programme du Congrès

    Author Index/lndex des auteurs

    SUBSCRIPTION RATE/ABONNEMENT PAR AN $10.00 ADVERTISING. SUBSCRIPTIONS AN D CHANGE OE

    A DDR ESS/PU B LICITE, ABONNEMENT ET CHANGEMENT D'ADRESSE:

    i

    vi

    V 11

    vii

    vii

    Ix

    X

    1

    39

    Canadian Association of Physicists Association Canadienne des Physiciens

    Suite 903, 151 Slater Street Ottawa, Ontario K IP 5H3

    Phone: (613) 237-3392

    C anadian Association o f Physicists//'Association canadienne des physiciens / 977 A II rights reserved

  • OFFICERS OF THE ASSOCIATION/BUREAU PE DIRECTION COUNCIL/CONSEIL: 1976-77

    *President R.J.A. Lévesque Université de Montréal*Past President A.E. Douglas National Research Council, Ottawa*Vice-President H,E, Johns Ontario Cancer Institute, Toronto*Vice-President Elect R.R. Haering Univeristy of British Columbia*Honorary Secretary-Treasurer J.S. Fraser A.E.C.L., Chalk RiverDirector - Members H. Lysons National Research Council, OttawaDirector - Affiliates J.K. Walker Energy Mines & Resources, OttawaDirector - Students L. Krauss Carleton UniversityDirector - Corporate Members S.H. Ungar Radionics Limited, MontréalEditor R.L. Clarke Carleton University

    DIVISION CHAIRMEN

    Aeronomy and Space Physics r:.G. Shepherd York UniversityATOMIC & Molecular Physics D. Carette Université LavalCanadian Geophysical Union I. Gough University of AlbertaCondensed Matter Physics R. Datars McMaster UniversityMedical & Biological Physics C,F. MacDonald Victoria Hospital, LondonNuclear Physics K. Mark McGill UniversityOptical Physics I. Stegeman University of TorontoParticle Physics Takahashi University of AlbertaPhysics Education D.C. Baird Royal Military College, KingstonPlasma Physics H.M. Skarsgard University of SaskatchewanTheoretical Physics H. Umezawa University of Alberta

    COUNCILLORS/CONSEI LL ERS

    British Columbia and Yukon D.F. Measday (1) University of British ColumbiaD.E. Lobb (2) University of Victoria

    Alberta E.H. Pinnington (1) University of AlbertaH.R. Krouse (2) University of Calgary

    Saskatchewan and Manitoba K.V. Paulson (1) University of SaskatchewanJ.S.C. McKee (2) University of Manitoba

    Ontario - Southwest F.P. Koffyberg (1) Brock University, St. CatharinesM. Fujimoto (2) University of Guelph

    Ontario - Central and North L.D. Reed (1) D.C.I.E.M., DownsviewG.A. Rubin (2) Laurentian University

    Ontario - East D.C. Baird (1) Royal Military College, KingstonM.K. Sundaresan (2) Carleton University

    Quebec C. St-Pierre (1) Université LavalBenoit Jean (2) INRS, Université du Québec

    New Brunswick & Newfoundland H. Kiefte (1) Memorial University of NewfoundlandR.M. Lees (2) University of New Brunswick

    Nova Scotia and Prince Edward Island E.W. Grundke (1) St. Francis Xavier UniversityA.M. Simpson (2) Dalhousie University

    At large R. Carbonneau (1) C.R.D. ValcartierJ.H. Ormrod (2) Chalk River Nuclear Laboratories

    EDITOR - CANADIAN JOURNAL OF PHYSICS P.R. Wallace McGill University

    EXECUTIVE SECRETARY/SECRETAIRE EXECUTIF M.L. Jento

    *Member of Executive Committee (Revised By-Laws 1973, Art. V, Sec. 2)(1) Term ends June 1977; (2) Term ends June 1978

    CORPORATE MEMBERS ■- 1977MEMBRES CORPORATIFS - 1977

    NICOLET CANADA LIMITED

    ALLAN CRAWFORD ASSOCIATES LIMITED ONTARIO HYDRO

    APTEC ENGINEERING LIMITED PHILIPS ELECTRONICS INCORPORATED

    BARRINGER RESEARCH LIMITED POLYSAR LIMITED

    BELL-NORTHERN RESEARCH LIMITED R.C.A. LIMITED

    CTF SYSTEMS INCORPORATED RADIONICS LIMITED

    CANADIAN GENERAL ELECTRIC COMPANY LIMITED UNIROYAL LIMITED

    COMPUTING DEVICES COMPANY VARIAN ASSOCIATES OF CANADA LIMITED

    EALING SCIENTIFIC LIMITED

    EDWARDS HIGH VACUUM (CANADA) LIMITED McGILL UNIVERSITY

    ELECTROVERT LIMITED MEMORIAL UNIVERSITY OF NEWFOUNDLAND

    GULF OIL CANADA LIMITED UNIVERSITY OF OTTAWA

    INSTITUT DE RECHERCHES DE L 1 HYDRO-QUEBEC UNIVERSITY OF SASKATCHEWAN

    LUMONICS RESEARCH LIMITED UNIVERSITY OF VICTORIA

    MacDONALD DETTWILER AND ASSOCIATES LIMITED UNIVERSITY OF WATERLOO

  • RENSEIGNEMENTS GENERAUX GENERAL INFORMATION

    Le trente-deuxième congrès annuel de l'Association Canadienne des Physiciens aura lieu de lundi 20 juin au jeudi 23 juin 1977, à la cité universitaire de l'université de la Saskatchewan, Saskatoon, Saskatchewan. Le département de Physique est heureux d'annoncer le retour de ce congrès après un lapse de dix-huit années, et accueille chaleureusement les membres de cette profession.

    GUIDE POUR L'ARRIVEE

    Par avion: la cité universitaire est située à environ 10 milles au sud-est de l'aéroport.Nous recommandons le taxi aux personnes qui ont des réservations aux résidences universitaires. Le tarif est d'environ $5. et peut être partagé. Une limousine fait le trajet entre l'aérogare et certains hôtels (Park Town, King George, Holiday Inn). Le tarif est de $1.50 par personne.

    Ceux qui ont des réservations aux résidences universitaires sont priés de se rendre au Saskatchewan Hall où se trouve le bureau des résidences, sauf le dimanche alors qu'il sera situé au Athabasca Hall, Gold Room, à partir de 13h. (Voir plan ci-joint).

    Les personnes qui voyagent en voiture sont priées de noter que la cité universitaire est située tout juste au nord de la route 5 également appelée College Street sur la carte fournie dans cet exemplaire.

    En cas de difficulté, on pourra rejoindre le comité local au numéro (306) 343-4271.

    TRANSPORT LOCAL

    Cité universitaire au centre-ville

    1. L'autobus urbain no 2 "Pleasant Hill" mène au centre-ville et ensuite au Holiday Inn. Les départs s'effectuent à toutes les demi-heures de 6h le matin à minuit.

    2. L'autobus no 7 "Hudson Bay Park" mène également au centre-ville en passant parl'hôtel Park Town de 6h à 19h. A partir de 19h, l'autobus no 9 "Idylwyld South" vous conduira de l'université au centre-ville avec arrêt tout près de l'hôtel Park Town.

    Centre-ville à la cité universitaireL'autobus no 2 "University" en face du Holiday Inn vous conduira du centre-ville à la cité universitaire. Ceux qui demeurent au Park Town auront avantage à prendre l'autobus no 7 "Sutherland" à l'angle de la 25ième rue et Spadina, entre 6h le matin jusqu'à 19h, et l'autobus no 9 après 19h.

    INSCRIPTION

    Le bureau d'inscription pour le congrès sera situé au Athabasca Hall, Gold Room, le dimanche 19 juin, et au foyer de l'édifice de la physique les autres jours. Les participants pourront se

    The thirty-second annual congress of the Canadian Association of Physicists will be held in Saskatoon, Saskatchewan, on the campus of the University of Saskatchewan from Monday, June 20 to Thursday, June 23, 1977. The Physics Department is pleased to see the return of the congress after a lapse of eighteen years and extends a warm welcome to members of the physics community.

    ARRIVAL ORIENTATION

    By Air:- The university campus is about 10 miles southeast of the airport. Taxi service is recommended for persons who have reservations at the university residences. The fare is approximately $5.00 and may be shared. A limousine service operates between the airport and the hotels in the downtown area (Park Town, King George, Holiday Inn). The fare is $1.50 per person.

    Those with reservations at the university residence should proceed to Saskatchewan Hall where registration for accommodation will be at the main desk except on Sunday when it will be in the Gold Room of Athabasca Hall from 1:00 p.m. onward. (See map.)

    Persons travelling to Saskatoon by car should note that the university campus is located just north of Highway 5, also labeled College Street on the map provided in this issue.

    In case of difficulties the Local Committee may be contacted at (306) 343-4271.

    LOCAL TRANSPORTATION

    University Campus to City Centre1. Saskatoon Transit bus No. 2 "Pleasant Hill" goes to the centre of the city and then to Holiday Inn. The bus runs every half hour from 6:00 a.m. to midnight.2. Bus No. 7 "Hudson Bay Park" also goes to the city centre past the Park Town Hotel and provides this service only from 6:00 a.m. to 7:00 p.m. After 7:00 p.m. bus No. 9 "Idylwyld South" provides the transportation from the university to the downtown area with a stop near the Park Town.

    City Centre to University CampusTo reach the university campus from downtown one may board bus No. 2 "University" outside the Holiday Inn. Those staying at the Park Town Hotel will find it convenient to take bus No. 7 "Sutherland" at Spadina and 25th Street between the hours of 6:00 a.m. to 7:00 p.m. After 7:00 p.m. the service is provided by bus No. 9.

    REGISTRATION

    Registration for those attending the congress will be in the Gold Room, Athabasca Hall, on Sunday, June 19, and in the foyer of the Physics Building on other days. Tickets for the

  • procurer leurs billets pour le banquet et autres activités au bureau d'inscription.

    Le bureau d'inscription pour les résidences universitaires sera situé au Saskatchewan Hall, sauf le dimanche alors qu'il sera situé au Athabasca Hall, Gold Room.

    Bureau d'inscription pour le congrès

    Dimanche 19 juin: 14h à 21h, Athabasca Hall, Gold Room

    Lundi à jeudi, 20 au 23 juin: 8h30 à 17h, foyer, édifice de la physique

    Frais d'inscriptionMembre de l'ACP..................... $25.00Non-membres..........................$30. 00Enseignants d'école secondaire et étudiants prégradués............. $ 3.00

    Les personnes qui accompagnent les délégués sont également priées de s'inscrire; dans ce cas il n'y a aucun frais d'inscription. Les billets pour le banquet et pour les diverses activités mondaines seront en vente au bureau de l'hospitalité près du bureau d'inscription.

    LES REPAS

    Pendant tout le congrès les repas seront servis à la cafétéria de Marquis Hall. Les personnes demeurant aux résidences universitaires ont deux options:

    Option A — Chambre simple et 3 repas:$20.60 par personne par jour.Chambre double et 3 repas:$19.00 par personne par jour.

    Option B — Chambre simple, petit déjeuner et déjeuner: $18.10 par personne par jour.Chambre double, petit déjeuner et déjeuner: $16.50 par personne par jour.

    Ceux qui choisissent l'option B peuvent se procurer un billet pour le repas du soir à $4.00 le billet. Il faut acheter le billet au plus tard à 13h00 le jour même du repas.

    Les personnes ayant choisi l'option A recevront un rabais de $4.50 s'ils assistent au banquet, mercredi le 22 juin 1977.

    Les repas seront servis aux heures suivantes:

    petit déjeuner 7h30déjeuner 12h00diner 17h00

    Les personnes intéressées à l'excursion #2 (SED System Ltd. Tour) sont priées de noter que les autobus ne seront pas de retour à la cité universitaire â temps pour le repas du soir.

    social program and the banquet will be available from the congress registration desk.

    Registration for accommodation in the University Residences will be in Saskatchewan Hall on each day except Sunday when it will be in the Gold Room of Athabasca Hall.

    Congress Registration Desk

    Sunday, June 19: 2:00 p.m. to 9:00 p.m.,Gold Room, Athabasca Hall

    Monday-Thursday, June 20-23: 8:30 a.m. to5:00 p.m., Physics Bldg. Foyer.

    The schedule of registration fee is as follows:Members of the C.A.P................ $25.00Non members......................... $30.00High school teachers and undergraduate students............................ $ 3.00

    Guests accompanying congress registrants arerequested to register, without fee. Tickets for the various social events and tours can be obtained at the hospitality desk located in the registration area.

    ARRANGEMENT FOR MEALS

    Meals will be served throughout the congress in Marquis Hall. Persons using residence accommodations have two options:

    Option A — Single Room and 3 Meals:$20.60 per person per day.Double Room and 3 Meals:$19.00 per person per day.

    Option B — Single Room with Breakfast and Lunch: $18.10 per person per day.Double Room with Breakfast and Lunch: $16.50 per person per day.

    Delegates selecting Option B may buy an evening meal ticket on a daily basis at a cost of $4.00. The tickets must be bought prior to 1 p.m. on the day requested.

    For persons selecting option A and attending the banquet, there will be a reduction of $4.50 for Wednesday, June 22, 1977.

    The meal times are as follows:

    8h45 Breakfast13h30 Lunch18h30 Dinner

    Persons taking the SED System Ltd. Tour (outing #2) should note that the buses will not arrive back on campus in time for the evening meal.

  • STATIONNEMENT CAR PARKING

    Les personnes demeurant à l'extérieur de la cité universitaire pourront se procurer au coût de $3.00 un permis pour stationner dans l'espace V pendant toute la durée du congrès, ou stationner dans les espaces B ou G à $1.00 par jour. Ces permis de stationnement pour le congrès seront en vente aux bureaux d'inscription. Les personnes demeurant aux résidences pourront se procurer les permis nécessaires lors de l'inscription au bureau des résidences.

    Persons staying off campus will be required to obtain a convention parking sticker for lot V at a cost of $3.00 for the duration of the congress or they may park in lots B or G at a cost of $1.00 per day. Convention parking permits will be available at the registration desks. Persons staying in residence and requiring parking facilities will be provided with the necessary permits at the time of registration for accommodation.

    COMITE LOCAL

    Président Inscription Hospitalité BanquetProgramme local Visite des laboratoires PublicitéSalles de conférences Exposition Trésorier Hébergement Liaison K.V.

    MontalbettiLlewellyn and K.V. Paulson Kennedy ShinManson and J. Maybank Gregory GuptaPaulson and E. Ansaldo KoehlerLlewellyn and R. Montalbetti Sof ko Paulson

    LOCAL COMMITTEE

    ChairmanRegistrationHospitalityBanquetSocial Program Laboratory Tours PublicityLecture Halls and A.V.ExhibitsTreasurerAccommodationLiaison /j

    R.E.J.J.E.Y.M.A.H.J. B.I. C.

    K. V.J . A . E.J. G.J.

    Pour tous renseignements pendant le congrès, prière de vous adresser au comité local, bureaux du département de Physique, pièces 162 ou 157, téléphone: (306) 343-4271. Le service de placement de l'A.C.P. et le bureau de la presse seront à la pièce 132, et le bureau de l'executif de l'A.C.P. à la pièce 129, toutes dans l'édifice de la physique.

    The Local Committee may be contacted at the Physics Department Offices, Physics 162, or 157, phone (306) 343-4271. ^ ^ ^ ? q / f Z £

    The C.A.P. Placement Service and the Press Room will be located in Room 132, and the C.A.P.Executive Office in Room 129, all in the Physics Building.

    EXPOSITION PAR LES MANUFACTURIERS ET LES EDITEURS

    Il y aura un centre d'exposition industrielle semblable à celui des congrès antérieurs. Ce centre sera situé à l'étage principal de l'édifice de la physique et les sessions auront lieu dans les pièces adjacentes. Bien que plusieurs compagnies aient manifesté le désir d'exposer, aucun engagement n'a été conclu à l'heure actuelle. On s'attend toutefois à avoir les exposants habituels ainsi que quelques firmes canadiennes de l'ouest qui d'habitude n'exposent pas.

    MANUFACTURERS AND PUBLISHERS EXHIBITION

    There will be an industrial exhibit area similar to those at previous C.A.P. congresses. The exhibit area is on the main floor of the Physics Building in a central location; the sessions are being held in adjacent rooms. Although many companies have indicated an interest in exhibiting, no definite commitments had been made at press time in late March. Participants can anticipate seeing the regular exhibitors as well as a few western Canadian firms who have not normally participated in the past.

    The list of Exhibitors will be included in the registration kit.

    CAFE ET RAFRAICHISSEMENTS

    Le café sera servi pendant les pauses de l'avant-midi et de l'après-midi.

    REFRESHMENTS

    Coffee will be available mid-morning and mid-afternoon.

  • IV

    ACTIVITES MONDAINES ET EXCURSIONS

    Les excursions suivantes qui ont été organisées ont été choisies en raison de leur intérêt particulier ou de leur inaccessibilité relative par mode de transport public. Les billets seront en vente à l'inscription aux heures mentionnées.

    Excursion #1 - WESTERN DEVELOPMENT MUSEUM: lundi 20 juin

    Ce musée possède une collection remarquable d'équipements agricoles et domestiques utilisés par les pionniers des prairies. L'attraction principale demeure la rue d'une ville prospère de 1910 qui a été reconstruite pour illustrer le style de vie de cette époque. Nombre limite:100 personnes.

    Départ à 13h du département de Physique avec bref arrêt à l'hôtel Park Town et Holiday Inn dans cet ordre. Retour vers 16h. Billets y compris transport et rafraîchissements:

    Adultes: $2.50 Enfants: $1.00

    Prière d'acheter vos billets au bureau d'inscription de préférence le dimanche 19 juin, avant 9h ou, au plus tard, avant lOh le lundi 20 juin.

    Excursion #2 - SED SYSTEMS LTD.: lundi 20 juin

    SED systems Ltd. est une corporation universitaire qui, à l'origine, développait des charges utiles pour fusées et satellites. Cette corporation travaille encore dans le domaine des sciences spatiales avec des aéronomes canadiens soit à the Institute of Space and Atmospheric Studies (Université de la Saskatchewan) ou ailleurs. Les activités de cette corporation sont maintenant beaucoup plus variées, telles que systèmes de communication, dispositifs de télédétection et systèmes de micro-ordinateurs. Cette visite aura lieu de 16h30 à 18h30 au cours de laquelle des rafraîchissements seront servis. Nombre limite: 150 personnes.

    On peut se procurer des billets soit le dimanche 19 juin ou le lundi 20 juin avant 12h au bureau d'inscription. Des billets pour le transport seront également vendus aux mêmes heures: $1.00 par personne. Les autobus quitteront l'édifice de la physique à 16h.

    Excursion #3 - POTASH MINES: jeudi 21 juin

    Deux visites ont été organisées pour deux groupes de 39 personnes soit à la Mine Cominco à Vanscoy ou à la Mine PCS Cory. Les visiteurs passeront leur temps dans les mines souterraines et à l'usine de broyage. Les autobus quitteront le département de Physique à 13h avec bref arrêt à l'hôtel Park Town et Holiday Inn, et reviendront à 16h30.

    Adultes: $3.50 Enfants: $1.00

    Les billets pour le transport seront vendus au bureau d'inscription le dimanche 19 juin ou avant 12h le lundi 20 juin.

    SOCIAL EVENTS AND TOURS

    Special tours have been arranged for the following major attractions which have been chosen both for anticipated interest or their relative inaccessibility by public transport. Tickets must be obtained in the registration area before the times specified.

    Outing #1 — WESTERN DEVELOPMENT MUSEUM:Monday, June 20th

    This museum has an outstanding collection of agricultural and domestic equipment used by the Prairie pioneers. The main attraction is a street of 'Boom Town 1910', which portrays the life style of that time. The tour is available for 100 persons.

    Buses leave the University Physics Department at 1:00 p.m., calling at the Park Town and Holiday Inn in order, and returning by 4:00 p.m. Transportation, admission and refreshments:

    Adults - $2.50 Children - $1.00

    Tickets should be obtained in the registration area preferably on Sunday, June 19th, before 9:00 p.m., or, at the latest before 10:00 a.m. on Monday, June 20th.

    Outing #2 -- SED SYSTEMS LTD.: Monday, June 20th

    SED Systems Ltd. is a University Corporation, which was originally engaged in the development of rocket and satellite payloads: indeed the corporation is still involved in space sciences, and interacts with Canadian aeronomers both in the Institute of Space and Atmospheric Studies (University of Saskatchewan) and else-where. However, the corporation is now engaged in a much wider variety of activities including communication systems, remote sensing devices and microprocessor computer systems. A tour of the facilities and refreshments will be provided from 4:30 - 6:30 p.m. for 150 persons.

    Tickets for the tour must be picked up either on Sunday, June 19th, or on Monday, June 20th before 12:00 noon, in the registration area.Those requiring transportation must also purchase tickets at that time: the cost is $1.00 per person, and buses will leave the Physics Building at 4:00 p.m.

    Outing #3 — POTASH MINES: Tuesday, June 21st

    Tours will be available for two groups of 39 persons to either the Cominco Mine at Vanscoy or the PCS Cory Mine. Time will be spent in the underground mining areas and in the milling factory. Buses will leave the University Physics Department at 1:00 p.m., calling at the Park Town and the Holiday Inn, and returning at 4:30 p.m.

    Adults - $3.50 Children - $1.00

    Transportation tickets should be purchased in the registration area on Sunday, June 19th or before 12:00 noon on Monday, June 20th.

  • Excursion #4 - HUTTERITE COLONY, DUNDURN: mercredi 22 juin

    Cette excursion qui a été organisée pour 100 personnes au maximum permettra aux visiteurs de découvrir un genre d'agriculture très différent et des plus efficaces. Les autobus quitteront le département de Physique à 13h avec bref arrêt à l'hôtel Park Town et Holiday Inn, et reviendront â 16h30.

    Adultes: $3.00 Enfants: $1.00

    Les délégués pourront se procurer les billets de transport au bureau d'inscription dès l'arrivée, le dimanche 19 juin, ou avant 12h le lundi 20 juin.

    VISITE DES LABORATOIRES DE RECHERCHE

    Des arrangements spéciaux ont été prévus pour visiter les laboratoires de recherche de la cité universitaire. Ceux-ci comprennent le Laboratoire régional des Prairies du Conseil national de recherches, les laboratoires du Saskatchewan Research Council, la clinique des recherches sur le cancer, le Linear Accelerator Laboratory, les laboratoires du département de Physique et the Institute of Space and Atmospheric Studies. Toute information concernant les arrangements sera affichée au bureau d'inscription.

    Outing #4 — HUTTERITE COLONY, DUNDURN:Wednesday, June 22nd

    An afternoon visit will be available for up to 100 people, to a Hutterite Colony: this features a highly efficient and diverse farming style. Buses will leave the University Physics Department at 1:00 p.m., calling at the Park Town and Holiday Inn, and returning at 4:30 p.m.

    Adults - $3.00 Children - $1.00

    Transportation tickets should be purchased in the registration area upon arrival, but if possible on Sunday, June 19th or before 12:00 noon on Monday, June 20th.

    RESEARCH LABORATORIES OPEN HOUSE

    Research laboratories and installations on campus will be open to visits by arrangement. These include the National Research Council's Prairie Regional Laboratory; the Saskatchewan Research Council's Laboratories; the Cancer Clinic; the Linear Accelerator Laboratory; and the laboratories of the Physics Department and Institute of Space and Atmospheric Studies. Details of arrangements will be posted in the registration area.

    ACTIVITES SPORTIVES

    Les délégués ainsi que les personnes qui les accompagnent pourront utiliser la piscine située dans Physical Education Building pendant les heures réservées au personnel comme suit:

    RECREATIONAL FACILITIES

    C.A.P. delegates and companions will be allowed to use the swimming pool in the Physical Education Building during Faculty and Staff swimming periods according to the following schedule :

    Dimanche 13h30 à 16h30Lundi à mercredi midi à 13h30Mercredi 20h30 à 22h30

    SundayMonday to Wednesday Wednesday

    D'autres sports tels que le tennis et squash sont également disponibles: premiers arrivés, premiers servis.

    Other limited facilities like tennis and squash will also be available on first come first served basis.

    RECEPTION ET BANQUET - mercredi 22 juin

    L'université de la Saskatchewan recevra les congressistes et les personnes qui les accompagnent à une réception au Marquis Hall à 18h45. Le banquet aura lieu immédiatement après, à 19h30 au même endroit. $11.00 par personne, vin compris. Les billets doivent être achetés avant midi le mardi 21 juin car le nombre en est limité.

    CAFE, FRIANDISES ET CONVERSATION - dimanche19 juin

    Les membres du groupe local de la physique et leur épose recevront les visiteurs le dimanche 19 juin de 19h30 éa 21h30, édifice de la physique. Ce sera une excellente occasion de renouveler de vielles connaissances.

    RECEPTION AND BANQUET -- Wednesday, June 22nd

    The University of Saskatchewan is sponsoring a reception for congress participants and companions attending the banquet. The reception is scheduled for 6:45 p.m. in Marquis Hall. The banquet will follow at 7:30 p.m. at the same location. The cost is $11.00 per person (wine included). Tickets must be purchased before Tuesday noon as the number of tickets available is limited.

    COFFEE, CAKE and CONVERSATION — Sunday, June 19th

    The local physics group and wives will welcome visitors and renew old acquaintances on Sunday, June 19th from 7:30 to 9:30 p.m. in the Physics Building.

  • *

  • CANADIAN ASSOCIATION OF PHYSICISTS MEDALLISTS 1977

    LAUREATS DE L'ASSOCIATION CANADIENNE DES PHYSICIENS 1977

    CAP Medal for Achievement in Physics

    A.H. Morrish

    Herzberg Medal

    M.B. Walker

    CANADIAN ASSOCIATION OF PHYSICISTS PRIZE EXAM 1977

    RESULTATS DE L'EXAMEN DE L'ASSOCIATION CANADIENNE DES PHYSICIENS 1977

    One hundred and eighteen students from twenty nine universities competed this year. The exam was administered by R.G. Summers-Gill of McMaster University, Hamilton. An alphabetical list of the first eleven contestants with the names of the first prize-winner and the two students tied for second prize is given below:

    Pierre Asselin Marcel Berard Richard Dale Jan Grygier Aksel Hallin Robert Holdom Robin Lindsey J.H. Morgan Robert Pike John Todoeschuck Lome Whitehead

    Université de Montréal - FIRST PRIZEUniversity of Alberta - SECOND PRIZEQueen's UniversityUniversity of TorontoUniversity of British ColumbiaSimon Fraser University - SECOND PRIZEQueen's UniversityUniversity of WaterlooUniversity of TorontoMcGill UniversityUniversity of British Columbia

    FUTURE CONGRESSES

    CONGRES FUTURS

    1978 - University of Western Ontario, London, June 12-151979 - University of British Columbia, Vancouver, June 18-211980 - McMaster University, Hamilton, June 15-191981 - Dalhousie University, Halifax

  • LISTENERS, SPEAKERS, AND SESSION CHAIRMEN

    SPECIAL INSTRUCTIONS FOR TIMED PAPERS

    The papers will be timed in order to make it possible for listeners to transfer from one session to another.

    LISTENERS

    1) Please arrive at a lecture room promptly before the next paper is to begin.

    2) Leave a session unobtrusively, preferably either during or at the end of the question and answer period.

    SPEAKERS

    1) Make your slide projection arrangements before the start of your session.

    2) Be ready to start your talk on time.

    3) Pace your talk to end well before the next talk begins: about 3 minutes for a contributed paper and about 10 minutes for an invited paper.

    A) Answer questions and perhaps comments as completely and briefly as made necessary by the response of the audience.

    5) Obey your chairman's instructions.

    6) Most important, practise giving your talk BEFORE the meeting. Remember, you are the ambassador of your department and institution, and you will be judged by your audience.

    CHAIRMEN

    1) Get to the session room about half an hour before your session begins. Check that all needed projection and auxiliary equipment are present and operational. Check that your speakers are present.

    2) Start each paper right on time.

    3) Make sure each speaker stops talking well before the next paper begins.

    A) Keep the question periods interesting, lively and productive. Read over the papers in your session beforehand. If necessary, prepare comments and questions.

    5) Do not let any discussion period get out of hand, either on the speaker's or the questioners' side.

    6) If no one appears to give a paper, then either close the session until the time of the next scheduled speaker or else use the time imaginatively, perhaps begin a discussion of earlier papers.

    7) Under no circumstances may the order of giving the papers differ from that given in the program, even though you may, in your wisdom, see a better arrangement than that determined by the program committee.

  • INVITED SPEAKERS/CONFERENCIERS INVITES

    ANSALDO, E.J., UnivZtSity O f Saskatchewan; DB3: Electric Quadrupole Interactions in Metals: Systematic TrendsARSENAULT, H*, UnivZtSitë. Lavai; AE2: Statistical Properties of Laser Speckle BEAUDET, G* , U nivetsitli de M onttëdl; AA2: Nuclear Astrophysics in the Big BangBERGERSEN, B, , UnivZtSity Of BfiAtish Columbia; EBI : Theoretical Concepts in the Study of Quasi One Dimensional MaterialsBIRNIE, H.H. , UnivZtSity 0 Saskatchewan; DI2: The Saskatchewan Core Curriculum in PhysicsBURNETT, N.H., National Research Council of Canada; CA4: Scattering and Harmonic Generation in High Intensity CO2 Laser

    Heating ExperimentsCALAPRICE, F.P., PtinCZton UnivZtSity; DAI: Symmetries in Nuclear Beta DecayCARETTE, J.—D., U nivetSitz Laval; AB4: Atomes et molecules adsorbés sur le tungstèneCARTER, A.L., Catlzton UnivZtSity; BCl: Exotic Atoms - Recent DevelopmentsCHEEKE, D. , U nivetSitZ dz Shztbtooke; EB4: Phonons dans les systèmes de dimension réduiteCOEY, J.M.D., IBM Thomas J . Watson ReSZOtch CZYlttZ and CNRS, Gxznoblz; AC3: New Varieties of Magnetic Order in Amorphous Solids COLLINS, M.F. McMascet UnivZtSity; AC4: The Order - Disorder Phase Transition in AlloysCORKUM, P.B., National Rzszatch Council o f Canada; EE3: Synchronization of Short High Power Laser Pulses for Plasma

    Interaction StudiesCOSTAIN, C.C., National ReSZOtch Council o f Canada; DF1: The Canadian Primary Standard of Time and FrequencyDOUGLAS, A.E., National ReSZOtch Council Canada; AB1: High Resolution Molecular Spectroscopy in the Vacuum Ultra-Violet RegionFAULKNER, The Honourable J. Hugh, M inistry o f S ta te (5ot Scizncz and Technology; BGlFORSTER, J.S., Chalk RivCA Nuclzat Labotatotizs; DA3: Time Evolution Studies of Heavy Ion Induced Fission Using Crystal

    Blocking TechniquesFORSYTH, P.A., National Rzszatch Council of Canada and U nivetsity 0 f Wzstztn Ontatio; ba4: Origins of Radio Auroral Studies

    in CanadaFOWLER, W.A. , C a lifo tn ia In s t itu te o f Technology; AA1: Experiment and Theory Relevant to Explosive Nucleosynthesis in SupernovaeFRASER, J.S., Chalk Rivet Nuclzat L abotaioties; CC2: The Spallation Breeder of Fissile MaterialGREGORY, B.C. , 1NRS - In Z tg iZ ; CA2: Evaluation of Magnetoelectric Traps for Hot Plasma ConfinementHARRIS-LOWE, R.F., Royal M ilitâty C o llege ; DB2: Dissipation in the Transport of the Superfluid Helium FilmHUNTEN, D.M., U n iv Z tS ity Of Atizona; BA1: Atmospheric Minor Constituents in the Viking EraJOHNS, M.W., MeMastzt UnivZtSity; Dll: The Universities’ Expectations of High School PhysicsJOHNSON, D.C., Communications Rzszatch C zntte; EE2: CW Raman and Brillouin Fibre Optic LasersJOHNSON, R.R., UnivZtSity o f B r it is h Columbia and TRIÜMF; DA4: Nuclear Structure Studies Using Pion ProbesJONES, A.V., National Rzszatch Council o f Canada; BA2: Canadian Contributions to Auroral SpectroscopyJOSHI, Y., S t. Ttancis Kavizt U nivetsity ; AB2: Atomic Spectroscopy of Charged IonsKAMAL, A.N., U nivetsity o f A lbztta ; BC4: Radiative Decays of MesonsKELLY, F.M., U nivetsity o f Manitoba; AB3: Hanley Effect Study of Life-times and Collision Effects in Alkaline Earths KHANNA, F.C., Chalk Rivet Nuclzat Labotatotizs ; DB1: Elementary Excitations in Normal Liquid 3He; EA2: Pionic Effects in

    Low Energy Nuclear PhysicsKIM, J.S., S ta te U nivetsity Of, New Votk a t Albany; BA3: Magnetometers and Modern All-Sky Cameras in Auroral Studies LITHERLAND, A.E., U nivetsity o f Totonto; EAl: Electrofission of Light ElementsLITTLE, M.S., Butzau Of Radiolooical H ealth, R o ck v ille , Matyland; DC2: Standards and Regulations on Radiation Devices in the U.S.A MACDONALD, W.J., UnivZtSity Of A lbztta and TRItiMF; EA3: Proton - Nuclei Interactions at Intermediate Energy MEASDAY, D., UnivZtSity o f S t i l is h Columbia; GA3: New Developments in Intermediate Energy PhysicsMORAWITZ, H. , ISM Rzszatch LabotatOty, San Jo s e , C a lifo tn ia ; EB3: The Role of Librons in Quasi ID Organic Conductors NG, J.N«, UnivZtSity Of A lbztta ; BC3: Characteristics of Charged Lepton Spectra from Neutrino-produced Sequential Heavy Lepton OFFENBERGER, A.A., UnivZtSity 0j$ A lbztta ; CA3: Nonlinear Laser Plasma Interaction Experiments ORMROD, J.H., Chalk Rivet Nuclzat Labotatotizs; CC3: Chalk River Superconducting Heavy Ion CyclotronOTTENSMEYER, F.P., Ontatio Cancet In s t itu te and U nivetsity o f Totonto; GAI: Electron Microscopy - Imaging of Atoms, Molecules

    and CellsPATERA, G«, UnivZtSitZ dz Monttzal; EC2: A Classification of Sub-groups of Conformal Group of Space Time and Its Application

    to Physical ProblemsPEARSON, J.M., U nivetSitz de Monttzal; DA2: Hartree-Fock Approach to Exotic NucleiPERZ, J.M., UnivZtSity o f Totonto; AC2: Experimental Determination of Spin Properties of Conduction Electrons in the Alkali Metals PINTAR, M.M., UnivZtSity Of Watztloo; CBl: Nuclear Spin Polarization Torsional Spectroscopy in Solids POUTISSOU, J.-M., TRIUMF and U nivetSitz de MonttZal; BC2: Rare Decay Modes of Pion and MuonROBERTSON, E.W., Waltzt Muttay C o lleg ia te In s t itu te , Saskatoon; DI4: The Saskatchewan Core Curriculum: the High School

    Teachers' Point of ViewSERVRANCKX, R., UnivZtSity o f Saskatchewan; CCI: The Electron Pulse Stretcher Ring EROS and Its Applications SHEPHERD, G«G., Votk UnivZtSity; GA2: Observing the Dayside Magnetospheric Cleft s h e p h e r d, j.j., Sccenee Council o f Canada; BG2SHUTER, W.L.H., UnivZtSity Of B tit ish Columbia; AA4: Isotope Ratio of C and 0 Determination by Radioastronomy Techniques STEVENS, J.R. , UnivZtSity o f Guelph; DI3: The Ontario Core Curri culum in PhysicsSTOICHEFF, B.P., U nivetsity o f Totonto; DB4: Brillouin Scattering in Rare Gas Crystals; EEl: Tuneable Coherent Radiation

    in the Vacuum UltravioletSUTHERLAND, P., McMOStet UnivZtSity; AAI: Neutrino AstrophysicsSUZUKI, M., Univet&ity Of A lbetta ; ACl: A New Type of Phase Transition in Two-Dimensional Quantal and Classical Spin SystemsTEICHMANN, J., U nivetSitz de Monttzal; CAl: Dynamic Stabilization of MicroinstabilitiesVAN DRIEL, H., UnivZtSity Totonto; AE1: Ultrafast Optical Response of Semiconductor PlasmasWADATI, M., UnivZtSity of A lbztta and Kyoiku U n iv etsity , Tokyo; EC3: Theory of Soliton: Nonlinear Waves in Dispersive MediaWALKER, M., UnivZtSity o f A lbetta and Max Planck In s t i tu te , Munich; EC1: Present Status of Gravitational TheoryWEILER, L., UnivZtSity Of B t it is h Columbia; EB2: Preparation and Study of Organic MetalsWELSH, H.L., U nivetsity of Totonto; CEI: High Resolution Raman Spectroscopy of GasesWESTFALL, G.D., Lawtzncz Betkelzy LabotatOty; EA4: Nuclear Fireballs in Heavy Ion CollisionsZAREMBA, E., Queen*S U nivetsity ; BB1: Physical Adsorption of Atoms on Solid Surfaces

    IX

  • PROGRAM SUMMARY

    RESUME DU PROGRAMME

    The l e t t e r code o f the session, the s t a r t i n g t ime, the loca t ion and the top ics o f each session are

    given in o rder. A l l sessions w i l l be held in the Physics Bu i ld ing .

    (The personal names are those o f in v i te d speakers).

    SUNDAY1, JUNE: 19

    19:: 30 107

    MONDAY, JUNE: 20

    AA 9::00 107AB 9::00 130

    AC 9: 00 103

    AD 9: 00 128

    AE 9: 00 II

    BA 13:: 30 107

    BB 13: 30 103

    BC 13:: 30 128

    BD 13:: 30 130BE 13: 30 127

    BF 13:: 30 126

    BG 20 :00 107

    TUESDAY, JUNE 21CA 9:: 00 130

    CB 9 :00 103CC 9::00 202

    CD 9:: 00 126

    CE 9 : 00 128CF 9::00 107

    CG 9::00 127

    CAP COUNCIL

    Nuclear Astrophys ics; FOWLER, BEAUDET, SUTHERLAND, SHUTERAtomic and Molecu la r Physics Symposium; DOUGLAS, JOSHI, KELLY, CARETTEMagnetic P rope r t ies o f So l id s ; SUZUKI, PERZ, COEY, COLLINS

    Plasma Physics IOptica l Physics; VAN DRIEL, ARSENAULT

    B a lfou r W. C u r r ie Symposium - In v i t e d ; HUNTEN, JONES, KIM, FORSYTHSurfaces and Optica l P rope r t ies ; ZAREMBAP a r t i c le Physics Symposium; CARTER, POUTISSOU, NG, KAMALProper t ies o f L ig h t NucleiPhase T rans i t io n s

    Nuclear Ins trumentat ion and Techniques

    Physics and Soc ie ty ; FAULKNER, SHEPHERD

    Plasma Physics Symposium; TEICHMANN, GREGORY, OFFENBERGER, BURNETT Magnetic Resonance; PINTARAcce le ra to r Physics; SERVRANCKX, FRASER, ORMROD, BLACKMORE

    BiophysicsMolecu la r Physics; WELSH

    S truc tu re o f Heavy Nuclei Supe rconduct iv i ty and Pos it rons in Sol ids

    DA

    DBDCDD

    DEDF

    DGDH

    13:30 130 Nuclear Physics I ; CALAPRICE, PEARSON, FORSTER, JOHNSON

    13:30 103 Condensed Mat te r Symposium; KHANNA, HARRIS-LOWE, ANSALDO, STOICHEFF13:30 126 Health Physics; LITTLE

    13:30 128 Plasma Physics I I13:30 202 Ba lfou r W. C u r r ie Symposium - Contr ibuted I

    13:30 V?9 /7 i Atomic Physics; COSTAIN

    13:30 127 E lec t ron ic and Magnetic P rope r t ies of Metals 13:00 W Í / / 5 ” D iv is io n o f Physics Education Workshop

    16:4516:4516:4516:4516:4516:4516:4516:4516:4516:45

    202 D iv is io n o f Aeronomy and Space Physics ^W 9 n f D i v i sion o f Atomic and Molecu la r Physics 103 D iv is io n o f Condensed Matte r Physics ^

    126 D iv is io n o f Medical and B io log ica l Physics ^130 D iv is io n o f Nuclear Physics ^

    127 D iv is io n o f Optica l Physics165 D iv is io n o f P a r t ic le Physicsm / / s 'D iv is ion o f Physics Education128 D iv is io n o f Plasma Physics107 D iv is io n of Theore t ica l Physics ^

    DI 19:30 107

    WEDNESDAY, JUNE

    EA 9:00 107EB 9:00 103

    EC 9:00 130ED 9:00 128

    EE 9:00 V &EF 9:00 127

    EG 9:00 202

    FA 14:00 107

    Symposium o f the D iv is ion o f Physics Education; JOHNS, BÍRNIE, STEPHENS, ROBERTSON

    22Nuclear Physics I I ; LITHERLAND, KHANNA, MACDONALD, WESTFALL Low Dimensional Systems; BERGERSEN, WEILER, MORAWITZ, CHEEKE

    Theore t ica l Physics; WALKER, WADATI, PATERA Plasma Physics I I I

    (Lase rs ; STOICHEFF, JOHNSON, CORKUM

    L iqu ids and S t a t i s t i c a l Physics

    Ba lfou r W. C u r r ie Symposium - Contr ibuted I I

    CAP Annual General Meeting

    THURSDAY, JUNE 23GA 9:30 107 P lenary Session; OTTENSMEYER, SHEPHERD, MEASDAY

    13:00 CAP Counci 1

    Marquis Hall

  • SUNDAY, JUNE 19 , 1977 ROOM 107

    19:30 CAP COUNCIL

    Chairman: R .J.A . Lévesque

    MONDAY, JUNE 20, 1977 NUCLEAR ASTROPHYSICS

    ROOM 107 Chai rman: N. de Takacsy

    9:00AA1 Experiment and Theory Relevant to Explosive Nucleosynthesis in Supernovae

    w.A. FOWLER, CaliloAYiia InitÁXuXc ojJ Technology

    9:45AA2 Nuclear Astrophysics in the Big Bang

    G. BEAUDET, U n iv o u s it e d e Montieal

    10:30AA3 Neutrino Astrophysics

    P. SUTHERLAND, McMaitea UniveAiity

    11:15AA4 Isotope Ratio of C and 0 Determination By Radioastronomy Techniques

    w.L.H. SHUTER, UniueAAity ol B/vtti&h Columbia.

    MONDAY, JUNE 20, 1977 ATOMIC AND MOLECULAR PHYSICS SYMPOSIUM

    ROOM 130 Chai rman: H.L. Welsh

    9:00AB1 High Resolution Molecular Spectroscopy in the Vacuum Ultraviolet Region

    A.E. DOUGLAS, National ReAeoAch Council o$ Canada

    9:45AB2 Atomic Spectroscopy of Charged Ions

    YOGI JOSHI, ST. Fnancii XauieA Uniozn&ity

    10:30AB3 Hanley Effect Study of Life-times and Collision Effects in Alkaline Earths

    F.M. KELLY, UniveAAity o£ Manitoba

    11:15AB4 Atomes et molecules adsorbés sur le tungstène

    J.-D. CARETTE, UnioCAAitë Laoal

  • 2

    MONDAY, JUNE 20, 1977 MAGNETIC PROPERTIES OF SOLIDSROOM 103CHAIRMAN: A.V. Gold

    9:00AC1 A New Type of Phase Transition in Two-Dimensional Quantal and Classical Spin Systems

    M. SUZUKI*, UniveAA-Uy ofa k lb en X a

    Here we report some interesting results of Monte Carlo simulations for the two-dimensional quantal and classical XY-models. Monte Carlo simulations on the quantal system have been made on the basis of classical representations of it proposed by the present author. Classical cases have been studied by using the method of Binder and Rauch. The numerical results for the quantal XY-model show that there occurs in such a system a new type of phase transition without long-range order but with a singularity on the susceptibility. There is the appearance of vortices, as predicted by Kosterlitz and Thouless. More details will be reported at the Meeting together with some theoretical interpretations on the above results and on the similarity to spin glasses. The author would like to thank Professor C. Kawabata, Dr. A. Kuroda and Mr. S. Miyashita for allowing him to report here their partly unpublished work, and also thank Frofessor D.D. Betts for giving him a nice chance to visit Canada.

    *Permanent Address: Department of Physics, Faculty of Science, University of Tokyo, Bunkyo-ku, Tokyo, Japan.

    9:45AC2 Experimental Determination of Spin Properties of Conduction Electrons in the Alkali Metals

    J.M. p e r z, Uyiiv&ià-tty o j( T oron to

    The conduction electron g-factors in the alkali metals differ appreciably from those of a tree electron gas mainly because of many-body interactions, and the determination of precise experimental values of g is important to a critical appraisal of theoretical techniques for solving the many-body problem in these metals. In this presentation, several methods for measuring g are reviewed, and one in particular, the analysis of the amplitudes and phases of de Haas van Alphen oscillations, will be described in detail. The special techniques used to overcome problems arising from the martensitic transformation in sodium will then be treated. Finally, the results for all the alkalis (particularly those due to the Cambridge Croup — B. Knech D.L. Randles and D. Shoenberg) will be summarized, with reference to recent theoretical determination.

    10:30AC3 New Varieties of Magnetic Order in Amorphous Solids

    J.M.D. COEY, IBM ThomaA J . WatAon ReAeaAck Cen-teA, and CNRS, Grenoble, France

    Some novel forms of magnetic order are found in amorphous insulators and metals, their common feature being random orientation of the moments according to some probability distribution Ρ(Ψ). The determination of these structures from magnetization and Mossbauer data on materials with one or two chemical sublattices will be described, and a uniform nomenclature suggested. Physical mechanisms responsible for the scattered spin directions are i/ a broad distribution of exchange interactions or ii/ strong, randomly directed single-ion anisotropy. Both may be conveniently studied in amorphous rare-earth transition-metal alloys. The spin waves or other magnetic excitations and the condition for the appearance of magnetism in these materials will be discussed, and comparison made with disordered crystalline alloys, particularly the "spin glasses".

    *Permanent Address

    11:15AC4 The Order-Disorder Phase Transition in Alloys

    M.F. COLLINS, McMaAteA UnÂvQAAÎty

    The order-disorder phase transition, in a rather direct

    phase transition in alloys is conceptually one of the simplest which exhibits a Experiments on both the equilibrium and the non-equilibrium properties test the way.

    criticaltheory

  • MONDAY, JUNE 20, 1977ROOM 128Chairman: B.C. Gregory

    PLASMA PHYSICS I

    9:00

    AD1 Plasma Generation in Electrothermal Shock Tubes,* B. ARMSTRONG and B. AHLBORN, Unlv, of British Columbia.— Electrical shock tubes In which the energy of a capacitor bank is discharged through electrodes directly Into a test gas can produce two very distinctive modes of flow. At high fill gas densities the power flux delivered to the gas creates a subsonic ablation front, which drives a shock Into the test gas. At low fill gas densities and high power Input a supersonic heating wave Is created which propagates at high velocities Into the test gas converting It into plasma of about 2 to 3 eV. Details of the flow can be predicted if the heating characteristic is known. This function between the absorbed powerflux and the final temperature of the plasma was determined by time resolved measurements of pressure, temperature and front velocity.

    9:^5ADL A New Mechanism of Anomalous Resistivity.*

    A. HIROSE, Unlv. of Saskatchewan. — In conventional theories of anomalous resistivity it is assumed that relative drift between electrons and ions generates either electron-ion two-stream or ion acoustic instability. However, it has frequently been observed1 that the anomalous resistivity has only a weak corelation with the ion acoustic instability. Here, it is shown that electron plasma fluctuations, generated by, e.g., runaway electron beams, can strongly enhance the ion density fluctuations through a nonlinear scattering process. The growth rate of the ion density fluctuations is of the order of W/nT- where uip-j_ is the ion plasma frequency, and W is the fluctuation energy density of the electron plasma mode. The effective collision frequency for the electrons is of the order of ωρ6 W/nTe where u)pe is the electron plasma frequency.

    *Research supported by the National Research Council of Canada.1S.Q. Mah, Ph.D. thesis, Univ. of Sask. (1972).

    9:15AD2 Diverging Cylindrical Solitons Excited with a

    Probe.* T. CHEN and L. SCHOTT, Univ. of Saskatchewan.— It has been shown previously that solitary ion acoustic waves can be excited with an insulated cylindrical probe.1 Details of the method of excitation will be given and the experimentally observed spatial and temporal evolution of the waves will be compared with numerical solutions of the Korteweg-de- Vries equation.

    lT . Chen and L. Schott, Phys. Lett. A 58, 459 (1976).

    *Research supported by a grant of the National Research Council of Canada.

    9:30AD3 Experimental Study of Dynamic Stabilization of

    Dissipative Drift Modes by Oscillating Azimuthal Magnetic Field. S. Q. Mah, C. Boucher, J. Teichmann and H.W.H. Van Andel, Univ. de Montreal - The experiment is performed on a cylindrical plasma confined by an external magnetic field. The stabilization field is produced by an alternating current at 100 kHz in a single conductor placed parallel to the plasma column just outside the vacuum vessel. In an earlier experiment on an R.F. plasma, we have shown that under certain experimental conditions, anomalous plasma losses apparently due to the presence of drift instabilities were drastically reduced. The drift waves were eliminated, while the phase angle between electron and potential perturbations was seen to approach zero, as predicted by theory. Here a quantitative study is made of the stabilization field threshold of critical damping of drift waves under various experimental conditions. For these measurements the plasma source has been changed to a hot cathode source to facilitate experimental control. Preliminary results show that the measured critical fields agree well with theoretical calculations.

    10:00AD5 Orbit Function in the Theory of Strong Plasma

    Turbulence. G. P0C0BELLI, Úniv. of Saskatchewan.—The standing question in the theory of strong plasma turbulence of which law [t3/3 (Ref.l), t14 / 3 (Ref.2),

    k-v)2 (Ref.3) ] is correct for the exponential decay of the orbit function, is solved by taking into account in a more comprehensive way than done so far the correlation of the electric field fluctuations. It is shown thato.f. - exp I ik*vt 2m, ;.I

    (k.k*)2 t 2 (uik, -k' ·ν)2

    sinfw-. -k' >v)t l-cos(^-*,-k' ■* 1-2 ------- : — + 2 --------------_ ---

    _ (w£.-k''v)t (ω-t-.-k1 ·ν)2 t2The present expression yie^ds^a t**/8 law at small |^,-k,*v|t and a t2/(ω+,~k'·v)2 law asymptotically for the exponential decay. "Significant implications result for the velocity dependence of the diffusion tensor.

    T.H. Dupree, Phys. Fluids 9, 1773 (1966).2T.J. Birmingham and M. Bornatici, Phys. Fluids 15,31778 (1972).A.M. Sleeper, J. Weinstock and B. Bezzerides, Phys. Fluids 16, 1508 (1973).

    10:15Instabilités paramétriques dans un plasma chaud

    faiblement turbulent. F. BRUNEL et J. TEICHMANN, Univ. de Montréal - Il a été démontré·̂ · dans le cas unidimen- sionel que le mode ionosonore est profondément modifié en présence d'une faible turbulence de Langmuir. Lorsqu'un champ extérieur monochromatique pénètre un plasma faiblement turbulent au voisinage de la fréquence plasma, le couplage paramétrique se produit entre ce champ, un ou deux modes de Langmuir et le nouveau mode de basse fréquence résultant de l'interaction de la turbulence sur le mode ionosonore. Une théorie cinétique tri- dimensionelle est développée et l'approximation des phases aléatoires utilisée pour la turbulence. Des résultats sont dérivés pour différents paramètres de la turbulence et du champ H.F. extérieur.

    1V.N. Tsytovich, Sov. Phys. JETP, 30, 83 (1970).

  • h

    AD? Mesures sur un arc à courant alternatif. 25 kV, 60 kA, brûlant dans l'air. MICHEL G. DROUET, PIERRE KIEFFER, direction Sciences de base, et MICHEL ROY, laboratoire_Grande jouissance, IREQ, Varennes, Québec, Canada JÓL 2P0 — L'arc électrique brûle dans l'air entre deux électrodes distantes de 1 mètre. Le courant dans l'arc est variable de 1 à 60 kA et l'arc dure 1 seconde. L'allongement de l'arc en fonction du temps est déterminé à l'aide d'une caméra rapide. A haut courant, l'allongement atteint 20 mètres. Des mesures simultanées du courant, de la tension et de l'onde de pression produite par l'arc, ont été effectuées. Les relations entre les paramètres électriques de l'arc, la longueur de l'arc et l'onde de pression générée seront présentées.

    1 0 : 3 0

    10:145AD8 Confinement of a Fusion Plasma bv a Cold Gas

    Blanket.* B. AHLBORN, Univ. of British Columbia.—The particle end losses from a linear magnetic fusion reactor can be suppressed by establishing an ablation front in a cold gas blankét. The power density W(Watts/cm2) to drive the thermal front may be drawn from inside (energy end losses) or outside (auxiliary heating). With W below 10^W/cm2 and a D-T blanket the particle outflow is retardet. With higher W values the flow is completely stopped and the fusion plasma is recompressed by a shock wave traveling inwards from the ends.

    11:00AD9 Dynamics of a High β Plasma Column.*

    J.N. MCMULLIN and C.E. CAPJACK, Univ. of Alberta—The evolution of a high β linear θ-pinch plasma is investigated using a square profile model. A new analytic solution for the self-similar area wave is found for the case β=1, γ=2 and an exact integral of the motion of the reflected area wave is derived in the general case. The evolution of the plasma variables in the region between the reflected area waves is calculated numerically. Except for cases in which /l-B ^ a/b (plasma radius/sole- noid radius), the density in this region is a slowly varying function of position. The relative fusion power production and total energy yield is estimated, assuming constant temperature, for combinations of β and b/a relevant to two conceptual designs. It is found that in most cases significant power is produced after the area waves have reflected from the mid-plane of the solenoid. The model predicts that programming the applied magnetic field to simulate infinite b/a enhances the yield by ^85% for a 3-m neutron source but only by ^18% for a 1-km fusion reactor.

    *Supported by the National Research Council of Canada.

    Measurement of Stark Broadened Profile of Hell 4686A.* Μ. E. BACON, A. J. BARNARD and F. L. CURZ0N, Univ. of British Columbia.— Stark broadened profiles of the Hell 4686A line were measured using a Z-pinch plasma as source. The electron density was determined from the halfwidth of the Hel 3889 line and the temperature from the intensity ratio of the Hell 4686 and the Hel 3889 lines. The electron densities covered the range 0.5 to 2,3xl017cm3 and the electron temperature was 4 ev. The plasma homogeneity was checked by varying the length of the column observed. The experimental profiles are in better agreement with the recent calculations of Greene than with the earlier calculations of Kepple.

    ♦Supported by the National Research Council.

    1 1 : 1 5

    11:30AD11 Electron Collisional Ionisation Rate Measure

    ments of Lithium-like Nitrogen and Oxygen.* E. KÂLLNE, Univ. of British Columbia, and L.A. JONES, Los Alamos Scientific Laboratory.— The hot, dense plasma created by a 60kJ, 60kV thetapinch has been used to measure ionisation rates of nitrogen and oxygen. The temporal and radial temperature and density distributions are measured with 90° Thomson scattering and holographic interferometry using a 2J, 20 ns ruby laser. Using a 2.2 m grazing incidence monochromator, the time evolutions of strong VUV lines from the different ion stages are observed. The plasma light emission is predicted by solving the coupled rate equations with the observed temperature and density distributions included and by using a theoretical ionisation rate as input. These rates are adjusted until best fits with observed profiles are obtained. By including density corrections in the plasma model like depression of ionisation potential and 2s-2p mixing of the ground state as well as corrections for the temperature dependence of the excitation rate and for end losses in the plasma we found that the observed ionisation rates agreed to within 10% from Kunze's semi-empirical formula,♦Work performed under the auspices of US ERDA.

  • 5

    MONDAY, JUNE 20, 1977 OPTICAL PHYSICSROOM 129Chairman: J. Lit

    9:00AE1 Ultrafast Optical Response of Semiconductor Plasmas

    H. VAN DRIEL, Univ&UAXy 0 & ToKOYltO

    9:45AE2 Statistical Properties of Laser Speckle

    H. ARSENAULT, U n i v v u l t z L a v a l

    10:30 Break

    10:45AE3 Meas u re m e n t o f S u r f ace Roughness by U s in g Two-

    Wa v e l e n g t h S p e c k le P a t t e r n s . H I TOSH I F U J I I and JOHN

    W.Y. L I T , U n i v . L a va 1 . --A new method t o m easu re s u r f a c e

    ro u g hn e ss i s s t u d i e d t h e o r e t i c a l l y b y m ak in g use o f t h e

    s t a t i s t i c a l p r o p e r t i e s o f two m o n o c h ro m a t ic s p e c k l e p a t

    t e r n s . An o p t i c a l l y rough s u r f a c e i s i l l u m i n a t e d by a

    tw o - w a v e le n g th l a s e r beam, and t h e two s p e c k l e p a t t e r n s

    due t o each o f t h e w a v e l e n g t h s a r e a n a l y s e d i n t h e f a r -

    f i e l d . The rms d i f f e r e n c e be tw ee n t h e i n t e n s i t i e s o f

    t h e two p a t t e r n s i s d e f i n e d and e v a l u a t e d as a f u n c t i o n

    o f t h e rms o f t h e s u r f a c e r o u g h n e s s . I t i s shown t h a t

    t h e rms d i f f e r e n c e i n c r e a s e s w i t h i n c r e a s e o f t h e s u r f a

    ce r o u g h n e s s . F rom t h i s r e s u l t , a s im p l e method f o r

    m e a s u r i n g s u r f a c e r o ug hn e ss i s d e v i s e d . The e f f e c t i v e

    m e a s u r i n g r a n g e , o r t h e s e n s i t i v i t y , can be changed by

    v a r y i n g t h e two w a v e l e n g t h s o f t h e l a s e r beam. When an

    a r g o n io n l a s e r i s used f o r i l l u m i n a t i o n , a p p r o p r i a t e

    w a v e l e n g t h s can be chosen t o g i v e f u l l s c a l e r a ng es o f

    rms ro u g h n e s s v a r y i n g f r o m 0 - 0 . Sum t o 0-Aum, t h u s c o v e r

    i n g t h e most i m p o r t a n t r e g i o n s o f p r a c t i c a l s u r f a c e

    ro u g hn e ss o r d i n a r i l y e n c o u n t e r e d . Some c o m p u te r s im u

    l a t i o n s t u d i e s a r e co nd u c te d and t h e y a r e i n good a g r e e

    men t w i t h t h e t h e o r e t i c a l r e s u l t s .

    11:00AE4 Nonlinear Optical Phenomena at Surfaces.* V. SO

    and G.I. STEGEMAN, Univ. of Toronto— A general theory of nonlinear wave phenomena at surfaces has been developed and will be illustrated by treating harmonic generation in thin film optical waveguides which are of current interest in communications. A waveguide typically consists of a high refractive index film (thickness - one optical wavelength) deposited on a low refractive index substrate. The nonlinear polarization field is calculated in both the film and substrate and the inhomogeneous wave equation for the Hertz vector is solved. The polarization generated electric and magnetic fields are

    derived in the usual way from the Hertz vector and discontinuities in the tangential E and H and normal D and B fields are calculated at both surfaces. New normal modes (solutions to the homogeneous wave equation) are then introduced to satisfy the electromagnetic boundary conditions. One of these modes evolves with propagation distance into a guided wave second harmonic. The predictions of this theory differ with those of "overlap- integral” methods which require averaging of the wave equation over the film thickness and neglect the boundary conditions.

    *Research supported by NRC.

    11:15Displacement of an Electromagnetic Beam upon

    Dielectric Reflection." L.A.A. READ, Wilfrid Laurier Univ., G.E. REESOR, and MAN WONG, Univ. of Waterloo - The theoretical investigations of Antar and Boerner* concerning the sideways displacement of an electromagnetic beam upon external reflection from a dielectric have been extended. We have adopted a similar plane wave expansion to predict values of the shift for 3 cm microwaves for both perpendicular and parallel polarization for reflection from a dielectric prism whose index of refraction is 1.685 and from a dielectric slab, 9.5 cm thick, whose index of refraction is 1.63. Experimental results will be presented which show that for the single reflection case (prism) the direction of the shift is dependent on polarization; that is, for parallel polarization the shift is backwards. For the multiple reflection case (slab), the results show the direction of the shift is forward for both polarizations.lAntar, Y.M. and Boerner, W.M., 1974, Can. J. Phys., 52, 962-'Work supported by N.R.C.

  • 6

    MONDAY, JUNE 20, 1977 BALFOUR W. CURRIE SYMPOSIUM

    ROOM 107Chairman: N.C. Gerson

    13:00BAl Atmospheric Minor Constituents in the Viking Era

    D.M. HUNTEN, U niveJU -ity 0 j( k i lz o n a .

    14:10BA2 Canadian Contributions to Auroral Spectroscopy

    A. VALLANCE JONES, N a t io n a l VtAQJVich C o u n c il oj Canada

    14:50 Break

    15:10BA3 Magnetometers and Modern All-Sky Cameras in Auroral Studies

    J,S. KIM, S t a l e L in iv en à ity Wew Vo/ik a t A lbany

    15:50BA4 Origins of Radio Auroral Studies in Canada

    P.A . FORSYTH, N a t io n a l RcA eaach C o u n c il ofi C anada an d t h e i t n lv e n t i t y o ̂Wet t& in O ntan lo

    MONDAY, JUNE 20, 1977 SURFACES AND OPTICAL PROPERTIESROOM 103

    Chairman: R,R, Parsons

    13:30BB1 Physical Adsorption of Atoms on Solid Surfaces

    E. z a r e m b a, Q ueen'6 U n io o ju it y

    A review of the adsorption of atoms on solid surfaces is presented. Particular emphasis is placed on a description of the adsorption of the rare gases on metals. In these systems the attractive atom-solid interaction is the van der Waals (or polarization) force and methods for its calculation are described.The repulsive interaction is associated with exchange effects due to the overlap of the atomic and metallic electronic wave functions. The full interaction has recently been calculated for the case of helium on simple and noble metals. Application of the theory to the other rare gas atoms is discussed. A survey of the experimental techniques used to probe the atom-surface interaction is also given.

    14 : 15Low Temperature Photoconductivity in Amorphous

    ZnSe*. R. SHIAH, P.K. LIM, D.E. BRODIE and P.C. EASTMAN University of Waterloo, The Photoconductivity Δσρ, in a-ZnSe, was studied from 400K to 50K. In addition to the normal high temperature results, where a maximum (near 390K) occurs in Δσρ, near the temperature at which the occupancy of the recombination levels changes from being dominated by photoexcited carriers, a minimum is observed in Δσρ near 150K as the temperature decreases. Δσρ is frequency dependent, (i.e. Δσρ 'v ω ; s ^ 0.6), suggesting that Δσρ may be due predominantly to carriers hopping in localized states.

    A model is proposed to account for this new observation, involving a recombination centre near, but not at, the dark Fermi level. A possible mechanism for the recombination is suggested.

    This work is supported by the National Research Council of Canada.

    14:30BB3 Some Properties of Amorphous ZnSe.* P.K. LIM

    and D.E. BRODIE, Unlv. of Waterloo— Amorphous ZnSe has been prepared by vacuum deposition onto glass and fused quartz substrates cooled to 'vlOO K. As made films are unstable and they must be annealed to obtain mature amorphous specimens. Rapid crystallization of a-ZnSe, occurs above 450 K and this is an activated process with an energy of 1.9 eV. The annealling may be observed in the d.c. conductivity when the sample is warmed for the first time from 100 to 410 K. The subsequent analysis of the d.c. conductivity, photo conductivity, thermoelectric power, and a.c. conductivity indicates that a-ZnSe can be described satisfactorily with a Mott type model. Electrically, only hopping in the band tail states and at the Fermi level can be observed at temperatures below 410 K. Below 270 K the conduction process is consistent with variable range hopping and the density of states N(Ef), at Ef is 3 x lOl? cm“3/eV if Vp^ 4 x 10iU sec”i as calculated from a deformation potential according to Millar and Abrahams (1960). Evidence is presented which indicates that annealling reduces N(Ef).

    *This work is supported by the N.R.C. of Canada A. Millar & E. Abrahams, Phys. Rev. 120 (1960) 745

  • 7

    114:1* *5BBÍ4 La diffusion de__la lumière par les

    couches métalliques qranulairesT* V. V.TRUONG, Univ. de Moncton; G. D. SCOTT, Univ. of Toronto.-** Dans les études sur les propriétés optiques des couches métalliques granulaires, on a souvent négligé la diffusion de la lumière par les particules formant la couche. Les couches sont considérées comme des milieux continus possédant des propriétés optiques effectives. La contribution de la lumière diffusée dans certains cas peut cependant devenir considérable. Dans la présente étude, la distribution spectrale de la lumière diffusée à partir des couches granulaires d'or, de cuivre et d'argent a été mesurée dans la région de 0.35 à 1.0 pm. Les couches minces sont préparées de telle façon à obtenir des particules de forme régulière et de grandeur considérable, allant jusqu'à 1000A. La distribution angulaire de la lumière diffusée a été aussi mesurée. Les mesures expérimentales ont été ensuite comparées aux résultats calculés à partir d'un modèle de sphéroïdes.*Subventionné par le C.N.R.C.

    15:15BB5 Aueer Spectroscopic Evidence that Plasma Oxida

    tion Involves Mass Transfer from the Cathode to the Anode, J.D.LESLIE and V.KEITH, Physics Dept., Univ. of Waterloo - It has been generally assumed that the oxygen ions in the plasma are responsible for the oxidation of the anode. Reactive sputtering of cathode material has been viewed as a possible source of contamination of the plasma oxide layer that could be avoided by having the anode sample facing away from the cathode. We present clear evidence, through the use of Auger spectroscopy, that cathode material is transported to the anode during plasma oxidation, even when the anode is facing away from the cathode and is located on the back of a shield. In these experiments we have used anodes of Ta,Nb and Cu and cathodes of Ta,Nb,Al and C ,in various combinations. Our results indicate that cathode material does not deposit on the anode unless the anode is passing a current. The oxide on the anode formed by plasma oxidation is generally formed of two layers, with the outer layer being composed of oxide of the cathode material and the inner layer being composed of oxide of the anode material. We will present evidence that the transfer of cathode material to the anode is an integral part of the plasma oxidation process.

    15:30BB6 ATR Spectra of Alternating Plasma-

    Dielectric Layers.* G. J. KOVÁCS and. G. D. SCOTT, Univ. of Toronto— The method of attenuated total reflection (ATR) can be used to optically excite electromagnetic waves guided by thin films. We report a study of the ATR angular spectra of alternating silver-dielectric films concentrating on the two systems Ag-diel.-Ag, and Ag-diel.-Ag-die1.- A g . The resonances of the three layer system are observed to split

    into doublets in the five layer system. This splitting occurs for both parallel and perpendicular polarization of the incident radiation and is predicted by classical electromagnetic theory. Surface roughness of evaporated dielectric films has an important effect on both p- and s-polarized spectra. The roughness at a metal-dielectric interface is modelled as a thin cermet layer, which accounts for certain discrepencies between the experimental resonan· ces and those calculated by assuming perfectly planar metal-dielectric interfaces."Supported bj the National Research Council of Canada.

    15:^5Shell Model of the Bound Multiexciton Complexes in

    Si.* M.L.W. Thewalt, G. Kirczenow and R.R. Parsons, Univ. of British Columbia. The luminescence line series recently observed in lightly doped Si at liquid He temperatures are explained in terms of a shell model description of the bound multiexciton complexes. Many of the predictions of the shell model are borne out by our new experimental results. The donor bound exciton is found to have bound excited state as postulated in the theory. Preliminary results of very high resolution studies of these lines undertaken with a Fabry- Perot interferometer will also be described.

    * Supported by the National Research Council of Canada.

    l6:00Excitation Characteristics of the 0.93

    μ Luminescence of C u ? 0 . D. J. KENWAY,C. DUVVURY and F. L. WEICHMAN, Univ. of Alberta.--Despite extensive study, the mechanisms of the 0.93 μ luminescence of CU2O are not entirely understood. There is some evidence that exciton capture is responsible for the 0.93 μ luminescence stimulated by excitation with visible radiation. Through the use of a tunable dye laser we have been able to generate some further evidence of this by studying at a number of different excitation wavelengths the luminescent output as a function of temperature.

  • MONDAY, JUNE 20, 1977ROOM 128Chairman: H.C.S. Lam

    PARTICLE PHYSICS SYMPOSIUM

    13:30BC1 Exotic Atoms - Recent Developments

    A . L. CARTER, C axÍZ ton UvUvQAàlty

    14:13BC2 Rare Decay Modes of Pion and Muon

    j.-M. POUT IS SOU, TRIUMF and U yU vfM itz d z M ow tA zal

    Rare decay modes of pions and muons are very good tools to improve our understanding of the weak interaction. Tt is hoped that the advent of meson facilities will allow these difficult experiments to be significantly improved. At TRIUMF these experiments exploit the good performances of very large sodium Iodide detectors which will be discussed. We will present progress report on several experiment1 currently underway at TRIUMF; the study of the weak axial-vector form factor of pions via the π -*■ evey decay mode, the studv e-u universality via a high precision determination of the n->eve decay mode. Results will be presented on the recent experiment that looked for the u ■* ey decay mode.

    ^Collaboration Université de Montreal, University of British Columbia and University of Victoria.

    13:00BC3 Characteristics of Charged Lepton Spectra from Neutrino-produced Sequential Heavy Lepton

    J.N. NG, l lH iw u -c ty M b w t a

    The production of a charged sequential heavy lepton, L+, in high energy v^N scattering via the Bethe-Heitler process and its subsequent leptonic decay into e*v triplet is calculated and the cross section for the production of 2 GeV/c2 heavy lepton at 50 GeV incoming energy is ^10 U3cm2 with usual four-Fermi coupling. One characteristic feature of the charged decay products is the large asymmetry favoring u“ due to threshold effects persisting at presently available energies.

    15:45BC4 Radiative Decays of Mesons

    A.N. KAMAL, UilivQAA'Lty O AZbçAÙL

    MONDAY, JUNE 20, 1977 PROPERTIES OF LIGHT NUCLEIROOM 130Chairman: H.$. Caplan

    13:30B D l P i o n i c X Rays f r o m He l i u m T h r e e - G.R . MASON,

    G . A. BEER, S .K . K IM , A. O L IN , R.M. PEARCE, U n i v . o f

    V i c t o r i a , and D . A . BRYMAN, M.S. D I X I T , J . A . MACDONALD,

    J . S . V INCENT, TR IUMF — N e g a t i v e p io n s p roduced a t t h e

    TR IUMF c y c l o t r o n w e re s to p p ed in a l i q u i d h e l i u m - t h r e e

    t a r g e t 1 o p e r a t e d a t 2° K. X r a y s e m i t t e d d u r i n g th e

    p io n a to m ic cascade w e re d e t e c t e d w i t h a S i ( L i ) d e t e c

    t o r h a v in g a r e s o l u t i o n o f 160 eV a t 6 k eV . E x p e r i

    m e n t a l l y - d e t e r m i n e d v a l u e s w i l l be p r e s e n t e d f o r t h e

    s t r o n g i n t e r a c t i o n s h i f t and f o r t h e L o r e n t z î a n l i n e

    w i d t h f o r t h e K t r a n s i t i o n s ; p r e l i m i n a r y r e s u l t s i n

    d i c a t e ag re e m e n t w i t h t h e o p t i c a l model t r e a t m e n t by

    K r e 11 and E r i c sőn 2 .

    1 J . S . V i n c e n t and W.R. S m i t h , N u c l . I n s t r . and Me th .

    U_6 (197A) 551.

    2 M . K r e l l and T . E . 0 . E r i c s o n , N u c l . P h y s . B 11 ( 1969) 521 .

    * S u p p o r te d by t h e N a t i o n a l R e s e a rc h C o u n c i l o f Canada.

    13:L5BD2 P i o n i c 2 p - ls T r a n s i t i o n s i n 12Na and 2 t4Mq

    R.M. PEARCE, G . A. BEER, Ο . MASON, A. OLIN . P. P0FFEN-

    BERGER, U n i v . o f V i c t o r i a , and D . A . BRYMAN, M.S. D I X I T ,

    J . A . MACDONALD, TRIUMF — N e g a t i v e p io n s f ro m a p ro d u c

    t i o n t a r g e t e x t e r n a l t o t h e TRIUMF c y c l o t r o n w e re c o l

    l e c t e d and focu sed by a m a g n e t ic c h a nn e l 8 m i n l e n g t h ,

    d eg raded i n p o l y t h e n e , and s u b s e q u e n t l y s to pp ed i n sam

    p l e s o f L i F , Na m e ta l and Mg m e t a l . The X r a y s accom

    p an y in g t h e cascade o f t h e p io n s t h r o u g h th e a to m ic

    o r b i t s w e re d e t e c t e d i n a h ig h r e s o l u t i o n i n t r i n s i c

    ge rman ium d e t e c t o r . The Is l e v e l i s o f i n t e r e s t b e

    cause t h e o v e r l a p o f t h e p io n w i t h t h e n u c l e u s causes

    a b ro a d e n in g due to n u c l e a r a b s o r p t i o n o f t h e p io n and

    a s h i f t i n e n e r g y f ro m t h e no rma l e l e c t r o m a g n e t i c v a l u e

    due to th e p io n - n u c le u s i n t e r a c t i o n . The e n e r g y o f t h e

    2 p - 1 s X r a y i n p i o n i c f l u o r i n e ( f ro m a p r e l i m i n a r y a n

    a l y s i s ) i s 19A.9 * 0 . 3 keV and th e w i d t h i s 9-60 iO . 7 O keV . These v a l u e s d e v i a t e somewhat f ro m p r e v i o u s

    w o r k 1 *2 and have e r r o r s a p p r o x i m a t e l y two t im e s s m a l l e r

    R e s u l t s f o r Na and Mg X r a y s w i l l a l s o be p r e s e n t e d .

    1 G.Backenstoss e t a l . , Phys.Lett. 2 5B, No.5 (1967) 3652 D .Κ . A n d e rs o n e t a l . Phys . Rev. 18jT, No. 1 ( 19 6 9 ) 9

  • 9

    BD3 The Four Body Reaction ‘ L i (p.pa)np as a Probe

    o f the C lu s te r S t ru c tu re o f " L i r D . I . BONBRIGHT,

    J.S .C. McKEE and J.W. WATSON, Cyc lo tron L abo ra to ry ,

    Univ . o f Manitoba -- The re a c t io n s 6L i(p ,pa )d and 6L i(p ,pa )np have been s tud ied a t a bombarding energy

    o f 39.8 MeV in a geometry s u i ta b le fo r observing quas if r e e sc a t te r in g . Evidence is presented fo r the e x i s t

    ence o f a c lu s t e r s t ru c tu re o f alpha p a r t i c l e plus a neutron-proton p a i r w i t h in the ground s ta te o f 6L i .

    ★Supported by the NRC of Canada.

    _LU : 00

    It : 151 9 8BDh Additional Results on the Be(p,pn) BeReaction H. JEREMIE, G. KENNEDY" and L. LEMAl^ * S * Lab. de Physique Nucléaire, Univ. de Montreal,— New measurements have been performed on the yBe(p,pn)$Beg

  • 10

    MONDAY, JUNE 20, 1977ROOM 127Chairman: D. Matz

    PHASE TRANSITIONS

    13:30BEI Elastic Neutron Scattering Study of the

    Antifluorite Crystal K?OsClf;. D. MINTZ and R.L. ARMSTRONG, Univ. of Toronto, Toronto, Ontario?B.M. POWELL and W.J.L. BUYERS, Atomic Energy of Canada Ltd., Chalk River, Ontario.--The structural phase transition in potassium hexachloro-osmate (K^OsClg) has been investigated at the NRU reactor by elastic neutron scattering methods. The observed change in the crystal structure in passing through Tc is consistent with a rotational model in which rigid OsClfc octahedra undergo a collective ferro-rotation. The transition temperature found from the temperature dependence of the Bragg peaks was 44.5 ± 0.4 K. The transition is continuous with a critical exponent, $ = 0.35 ± 0.06, characteristic of three-dimensional phase transitions.

    13:1,5 * BE2 Analysis of Power Series for Critical Exponents.E. W. GRUNDKE, St. Francis Xavier Univ.--An important step in series expansion studies of critical phenomena is the final analysis of the power series to obtain the location and exponent of its dominant physical singularity.! A procedure is described which moves the singularity to a known location and then estimates the exponent using a self-consistency criterion. To some extent the strong dependence of the estimated exponent on the estimated location of the singular point is bypassed. Several innovations in the standard techniques of Pádé and ratio analysis are also discussed.

    1 D. S. Gaunt and A. J. Guttmann, in "Phase Transitions and Critical Phenomena," vol. 3 (ed. C. Domb and M.S. Green). Academic Press (London and New York, 1974)

    * Supported by the National Research Council of Canada and the St. F. X. University Council for Research.

    I k : 00BE3 Further Investigation of the Classical Vector

    Model of Ferromagnetism. P. S. ENGLISH and D. L. HUNTER, St. F. X. Univ. - We have investigated the high-tempe rature series for the free energy and specific heat of the Classical Vector Model of ferromagnetism in arbitrary spin dimensionality (D). We have extended this series to twelve terms, and have calculated the thirteenth term explicitly for D=3 (the Classical Heisenberg Model). We discuss the convergence of this series, laying particular emphasis on the cases D=2 and D=3, and compare our results with previous work1-. Following the Universality Hypothesis, the results for D=2 may be applied to the superfluidity of liquid helium. We also describe preliminary work on the susceptibility of this model through which we expect to obtain a more reliable estimate of the critical point shortly. The present work will then allow us to obtain a more reliable estimate of the specific heat exponent a.

    1. M. Ferer; M. A. Moore and M. Wortis, Phys. Rev.B4, 3954, (1971).

    114:15BEk Spontaneous Symmetry Breaking in the Large

    Dielectric Polaron. D. MATZ, Univ. de Montreal.— We have shown elsewhere how to obtain the large dielectric polaron ground state energy within the Fock Green’s function approximation (with no a priori translational invariance) for all coupling constants, a.1 We found a translationally invariant exact ground state energy solution for a < 3,* and approximate ones for a > 3, corresponding to states which break the symmetries of the Frohlich hamiltonian1*2. Here we show how to obtain the exact polaron Fock wave function in the region 0 < a < 3, confirming explicitly that it is an eigenstate of total momentum with eigenvalue zero. More importantly, the wavefunction renormalization constant displays an essential singularity at a = 3, implying that for a > 3 the system exists in a phase of different symmetry (perturbation theory also is no longer applicable), a conclusion that is consistent with our previous findings1»2. Similar results hold for the low lying excited states, i.e., small total momentum states.

    JD. Matz, Can. J. Phys. 53, 2665 (1975).2D. Matz, Y. Lépine and R. Simard, submitted for publication.

    XÍ4 :30BE5 Anharmonic Phonons in Potassium.* H.R. GLYDE,

    Univ. of Ottawa, M.L. KLEIN, National Research Council of Canada, and J.-P. HANSEN, Univ. of Paris Vl.-Calcu- Lations of the phonon frequencies and lifetimes in K at T= 162.5 K and T = 311°K using both the self consistent theory of dynamics and direct molecular dynamic simulation have been made. These show that while the self consistent theory represents anharmonic effects well in simple metals such as K, there remain small errors, particularly in the phonon lifetimes, near the melting point. Comparison of both calculations with recent measurements^· on K via neutron inelastic scattering have also been made and show excellent agreement.

    ^J. Meyer et al, J. Phys. F. 6, 943 (1976)*Supported by the National Research Council of Canada.

    15:00BE6 Positron Self-Trapping in ^He . E. ZAREMBA and

    M.J. STOTT, Dept, of Physics, Queen's Univ.— Positron annihilation experiments in helium gas have shown anomalies in annihilation rate near the gas-liquid critical point which indicate the formation of positron self-trapped states in helium droplets. A theory is presented which appears to confirm the existence of the self-trapped states and accounts quantitatively for the positron annihilation rate in the range of densities and temperatures over which these states are stable. A thermodynamic potential describing the interacting positron-helium system is constructed and a variational method is used to obtain the positron wavefunction and helium density distribution. The stability of the droplets arises from the net attractive positron-helium atom interaction and the easy compressibility of the gas near the gas-liquid critical point. The droplets have a maximum density 2.2 x 1022cm” ̂and are typically 15Â to 25Â in radius.

    *Supported by the National Research Council.

  • 11

    BE7 Vacancy Formation Enthalpy Measurements in the Brass System. P. J. SCHULTZ, T. E. JACKMAN, J. FABIAN, J. R. MacDONALD and I. K. MacKENZIE, Univ. of Guelph. Doppler broadening measurements of the annihilation line in the Cu-rich half of the Cu-Zn system are analysed by a threshold temperature technique to show the systematic dependence of the formation enthalpy on concentration and crystal structure. Evidence is found for structural vacancies at low temperature in the neighbourhood of the β' phase, the associated well depth being much less than that of the non-structural vacancies generated in the same material at higher temperature.

    15:15

    15:30be8 A Magne t ic and Mossbaue r Study o f Magnetic

    Order ing and Vacancy C lu s te r in g in CuçFeS/i

    M.G. TOWNSENDt and W.B. MUIR*

    Magnetic s u s c e p t i b i l i t i e s and Mossbauer spectra recorded

    at temperatures between 4° and 300°K show th a t the low temperature form o f Cu5 FeS4 , b o rn i t e , orders magnet ica ll y a t 76±20K. At a lower temperature 8°K a second magnetic phase t r a n s i t i o n occurs. The Mossbauer spectra

    suggest t h a t the re is s i g n i f i c a n t p a r t i a l d iso rde r ing o f cations and vacancies in te t ra hed ra l holes o f the

    face-centred cubic su lphu r l a t t i c e . The rmoe lec tr ic power measurements in d ic a te t h a t bo rn i te i s a p-type semiconductor.

    MONDAY, JUNE 20, 1977 ROOM 126

    Chairman: T.K. A lexander

    13:30BF1 Timing Properties of HPGe Detectors* B. C.

    ROBERTSON, A. BROWN, Queen1s University and U. L. MALM, Aptec Engineering Ltd.— The dependence of a coaxial HPGe detector timing characteristics on detector bias has been determined. Pulse shape characteristics as a function of bias are compared with those of a Ge(Li) detector, and with calculated pulse shapes obtained using a simple model of the pulse generation process in HPGe detectors. The HPGe detector exhibits improved timing performance because of electric field modification due to the fixed space charge present.

    *Work supported in part by the National Research Council Canada.

    13:145BF2 Response F u n c t i o n s o f I n t r i n s i c

    German ium- D e t e c t o r s to t i e c t r o n s ana

    P o s i t r o n s * W.R. LEO and K. MUUKt, M c G i l l U n iv .~ - T h e use o f an i n t r i n s i c ge rm an ium c r y s t a l d e t e c t o r f o r t h e m easu rem en t o f h ig h n u c l e a r b e ta d ecay e n e r g i e s r e q u i r e s s p e c i f i c

    kno w led g e o f t h e r e s p o n s e f u n c t i o n s o f th e d e t e c t o r i n o r d e r to a l l o w u n f o l d i n g o f th e o b s e r v e d p u l s e h e i g h t d i s t r i b u t i o n s . We have c o n s t r u c t e d a Mon te C a r l o p ro g ram w h ic h

    c a l c u l a t e s t h i s r e s p o n s e f o r e l e c t r o n s and p o s i t r o n s i n t h e 1 to 10 MeV ra n g e . The p rog ram f o l l o w s t h e e l e c t r o n s and p o s i t r o n s t h r o u g h t h e ge rm an ium c r y s t a l and keeps t r a c k

    o f t h e e n e rg y d e p o s i t e d i n t h e c r y s t a l . The

    For a th ree dimensional magnetic superexchange i n t e r ac t ion between F e ( I I I ) atoms a small supe r- t ransfe r red

    spin dens i ty would be requ ired on in te rm ed ia te Cu( I) atoms.

    tEMR, Ottawa, K1A 0G1

    *McGil l U n iv e r s i t y , Montreal

    15:U5V e l o c i t y o f U l t r a s o u n d I n TTF-TCNQ C r y s t a l s . M.H.

    JERICHO, W .A . ROGER and A. SIMPSON, D a l h o u s i e U n i v . -

    We have m easu red t h e v e l o c i t y o f 10 MHz u l t r a s o n i c p u l

    ses w h ic h w e re p ro p a g a te d a l o n g t h e b - a x i s o f TTF-TCNQ

    c r y s t a l s . The v e l o c i t y o f l o n g i t u d i n a l t y p e modes i n

    c r e a s e s by a b o u t 2ζ% on g o in g f ro m room t e m p e r a t u r e to AK and th e v e l o c i t y c u r v e s show a s h a rp k i n e k n e a r 52K.

    The m a g n i t u d e s o f t h e v e l o c i t i e s a r e r e a s o n a b l y c o n s i s

    t e n t w i t h h e a t c a p a c i t y m e a s u re m e n ts 1 b e lo w AK and we

    c o n c lu d e t h a t TTF-TCNQ does n o t d i s p l a y a n y u n u s u a l

    e l a s t i c a n i s o t r o p y . W i t h t h e h e l p o f i n f r a r e d a b s o r p t i o n

    m e a su re m e n ts 2 we have c o n s t r u c t e d a s p e c i f i c h e a t f u n c

    t i o n f o r TTF-TCNQ and c o n c lu d e t h a t t h e b - a x i s t h e rm a l