Study of high-spin states by using stable and unstable nuclear beams

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Study of high-spin states by using stable and unstable nuclear beams Eiji Ideguchi CNS, the University of Tokyo

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Study of high-spin states by using stable and unstable nuclear beams. Eiji Ideguchi CNS, the University of Tokyo. What can we learn in high-spin studies?. Variety of nuclear structure as a function of angular momentum Single particle structure Collective motion Rotation Vibration - PowerPoint PPT Presentation

Transcript of Study of high-spin states by using stable and unstable nuclear beams

  • Study of high-spin states by using stable and unstable nuclear beamsEiji IdeguchiCNS, the University of Tokyo

  • What can we learn in high-spin studies?Variety of nuclear structure as a function of angular momentumSingle particle structureCollective motionRotationVibrationDeformationdegree of freedomSuper(2:1), Hyper(3:1) deformation deformed shell gapsTriaxial Chirality, Wobbling Next talk by Porf. MatsuzakiChange of structureCollective Single particle band terminationSpherical deformed

  • Studied High-Spin Nuclei Study of high-sin states is limited to proton-rich side High-spin states in neutron rich nuclei as well as stable isotopes are not studied well Very proton-rich nuclei are not studied wellNew detector system, new method (RI beam) is necessary to expand the research to new region Fusion evaporation,Coulex, fission, decaydirect reactions were used

  • High-Spin StudiesStudy of high-spin states near 48Ca regionRI-beam experiment at RIKEN, RIPS facility

    Study of high-spin states in A100 regionIn-beam gamma-ray spectroscopy by using stable isotope beam at JYFL

  • High-spin studies in neutron rich nucleiFusion reaction: effective to produce high-spin statesStable isotope beam + Stable isotope targetHigh-spin study induced by RI beamFusion reaction:RI beam + Stable isotope targetHigh-spin states in Stable | Neutron-rich nucleiHigh-spin states in proton-rich nuclei

  • Study of 49-52Ti (Z=22,N=27-30)Deformation parameter b2High-spin study of most neutron-rich stable nuclei.

    48Ca and neighbors deformed states at high spin50Ti (Z=22, N=28) Deformed collective band at high-spin

  • Low-energy 2ndary beams using RIPS2ndary targetGe arrayF09Be target 1.0mmF2:Plastic 0.1mmAl rotatable degraderF1Wedge degrader221mg/cm230MeV/A 5MeV/APPACX : 17 mm (s)Y : 8 mm (s)2-6 A MeV90%46Ar50MeV/A48Ca64MeV/A40pnA

  • Setup around 2ndary targetSecondary target 9Be 10m (1.8mg/cm2) thick10cmDoppler correction: 2 PPACs before 2ndary targetBeam Image, incident angle on target F2 PlasticF3PPACTOFBeam Energy GRAPE(CNS Ge Array, position sensitive)GRAPE

  • Gamma-ray spectra in 9Be(46Ar, xn)55-xTi reaction01000200030004000g-ray energy [keV]

  • Excitation function measurements

  • Excitation function

  • New transition in 49Ti 2370 keV transition above (19/2) state- coincidence analysis

  • New transition in 51Ti761keV transitionabove (13/2,17/2) state- coincidenceanalysis

  • Comparison with Shell Model CalculationsANTOINEE. Caurier, shell model code ANOTINE,IRES, Strasbourg 1989-2004E. Caurier, F. NowackiActa Phys. Pol. 30 (1999) 705KB3G

  • High-spin studies of 107In

  • Study of 107In (Z=49, N=58)

  • Experimental SetupJUROGAM43 Ge+BGO+ RITUGas filled Ion Sep.+GREAT spectrometerUniversity of JyvskylGREAT: Double sided Si stripSi PIN photodiode arrayDouble sided planar GeSegmented Clover Ge

  • 107In level schemeS.K. Tandel et al.PRC58, 3738 (1998)High-spin states Up to (33/2) at 6.976MeV

  • A rotational band in 107In51465982393493310531217138615731786(1972)Sum of 514,823,1053,1386,1573,1786 keV gate

  • Total Routhian Surface CalculationDeformed minima with 20.20.3A conf.E. conf.

  • J(1), J(2) moment of inertia

  • SummaryRI-beam experimentLow-energy 46Ar beam was developed at RIPSIn-beam -ray spectroscopy of 49-51Ti by 9Be+46Ar reactionExcitation function and - coincidence analysisNew transitions in 49Ti and 51Ti

    Stable isotope beam experimentIn-beam -ray spectroscopy of 107In by using JUROGAM+RITUA rotational band in 107InTRS Calculation -,-1/2) h11/2 contributionTRS Calc. could not reproduce band crossing at 0.45MeV

  • Collaborators (Study of 49-52Ti)M.NiikuraA, M.LiuA, Y.ZhengA, C.IshidaB, T.FukuchiC, N.AoiD, H.BabaD, N.HokoiwaE, Y.IchikawaF, H.IwasakiF, T.KoikeG, T.KomatsubaraH, T.KuboD, M.KurokawaD, S.MichimasaD, K.MiyakawaH, K.MorimotoD, T.K.OnishiF, T.OhnishiD, S.OtaA, A.OzawaH, S.ShimouraA, T.SudaD, D.SuzukiF, H.SuzukiF, M.TamakiA, I.TanihataI, Y.WakabayashiA, K.YoshidaD, B.CederwallBA. CNS, the University of TokyoB. Department of Physics, Royal Institute of TechnologyC. Department of Physics, Osaka UniversityD. The Institute of Physical and Chemical Research (RIKEN)E. Department of Physics, Kyushu UniversityF. Department of Physics, the University of TokyoG. Department of Physics, Tohoku UniversityH. Institute of Physics, University of TsukubaI. Physics division, Argonne National Laboratory

  • Collaborators(Study of 107In)B.CederwallAE.GaniogluAFB.HadiniaAK.LagergrenAT.BckAS.EeckhaudtBT.GrahnBP.GreenleesBA.JohnsonAD.T.JossCR.JulinBS.JuutinenBH.KettunenBM.LeinoBA.-P.LeppanenBP.NieminenBM.NymanBJ.PakarinenBE.S.PaulDP.RahkilaBC.ScholeyBJ.UusitaloBR.WadsworthED.R.WisemanDR.WyssAA. Department of Physics, Royal Institute of Technology, SwedenB. Department of Physics, University of Jyvskyl, FinlandC. CCLRC Daresbury Laboratory, UKD. Oliver Lodge Laboratory, University of Liverpool, UKE. Department of Physics, University of York, UKF. Department of Physics, Faculty of Science, Istanbul University,