Кластерные особенности легких ядер Кластерные особенности легких ядер в процессах релятивистской в процессах релятивистской фрагментациифрагментации

П.И. Зарубин (ОИЯИ)П.И. Зарубин (ОИЯИ)

http://becquerel.lhe.jinr.ru/http://becquerel.lhe.jinr.ru/

Hammer tracks inHammer tracks in cosmic ray events:cosmic ray events:

88Be produced inBe produced in ββ-delayed decay of -delayed decay of stopped stopped 88B and B and 88Li Li

6Li 7.5% 7Li 92.5%

9Be 100%

10B 19.8% 11B 80.2%

12C 99%

7Be 53 d

8B 0.8 s

9C 0.13 s 10C 19 s 11C 20 m

12N 11 ms

Internal target

Experimental hall 1B

Experimental hall 205

Experimental hall

NUCLOTRON – 6 GeV/n

SYNCHROPHASOTRON

CO2 laserCO2 laser

<PT>=73 MeV/c

<PT*>=52 MeV/c

8B → 7Be + p

8B → 7Be + p

10С

77Be/Be/1010СС//1212NN exposureexposure

6Li 7.5% 7Li 92.5%

9Be 100%

10B 19.8% 11B 80.2%

12C 99%

7Be 53 d

8B 0.8 s

9C 0.13 s 10C 19 s 11C 20 m

12N 11 ms

Z=4Z=5

Z=6

Z=7

Фазовая диаграмма ядерной материи

Соотношение долей кластерных состояний и нуклонов в зависимости от барионной

плотности симметричной ядерной материи

160A GeV Pb160A GeV Pb

10A10A GeV Au GeV Au

1A1A GeV U GeV U

CONCLUDING REMARKSThe presented observations serve as an illustration of prospects of the Nuclotron for nuclear physics and astrophysics researches. The relativistic energy scale does not impede investigations of nuclear interactions down to energy scale relevant for nuclear astrophysics, but on the contrary gives advantages for investigation of multi-particle systems.

The results of an exclusive study of the interactions of relativistic 9Be and 8B nuclei lead to the conclusion that the known features of their structure are clearly manifested in very peripheral dissociations.

Due to a record space resolution the emulsion technique provides unique entirety in studying of light nuclei, especially, neutron-deficient ones. Providing the 3D observation of narrow dissociation vertices this classical technique gives novel possibilities of moving toward more and more complicated nuclear systems. Therefore this technique deserves upgrade, without changes in its detection basics, with the aim to speed up the microscope scanning for rather rare events of peripheral dissociation.

The investigations with light nuclei provide a basis for challenging studies of increasingly complicated systems He – H - n produced via multifragmentation of heavier relativistic nuclei in the energy scale relevant for nuclear astrophysics. In this respect, the motivated prospects are associated with a detailed analysis of the already observed fragment jets in the events of EM & Diffractive dissociation of Au nuclei at 10.6A GeV and Pb nuclei at 160A GeV.

Q’=(M*-M)/A

3.65A GeV 3.65A GeV 2020Ne 2+2+2+2+2Ne 2+2+2+2+2

Диссоциация 8В → 2Не + Н c энергией 1.2 A ГэВ в периферическом взаимодействии на ядре эмульсии. На верхней фотографии видна вершина взаимодействия и струя фрагментов в узком угловом конусе. При смещении по направлению струи фрагментов (нижняя фотография) можно различить 2 фрагмента He и фрагмент Н (трек в середине).

88B: Total PB: Total PTT ( (77Be+p)Be+p)

EMD “white”starsEMD “white”stars

nnhh≠≠00

4.5А 4.5А GeV/GeV/cc “white” stars “white” stars 1212CC→3→3αα ≈≈ 1 % of Inelastic Interactions 1 % of Inelastic Interactions

1.2A GeV 9Be 3.22A GeV 22Ne 10.7A GeV 197Au

22Ne 3.22A GeV4100 Inelastic Interactions

6He 807 ms 8He 119 ms

12Be 23 ms

12B 20 ms

10Be 1510000 y 11Be 13.8 s

8Li 838 ms

9Li 178 ms

11Li 8.5 ms0+ 0+