Кластерные особенности легких ядер в процессах релятивистской фрагментации П.И. Зарубин (ОИЯИ)

Hammer tracks in cosmic ray events: cosmic ray events: 8 Be produced in β-delayed decay of β-delayed decay of stopped 8 B and 8 Li

6 Li 7.5% 7 Li 92.5% 9 Be 100% 10 B 19.8% 11 B 80.2% 12 C 99% 7 Be 53 d 8 B 0.8 s 9 C 0.13 s 10 C 19 s 11 C 20 m 12 N 11 ms

Internal target Experimental hall 1B Experimental hall 205 Experimental hall NUCLOTRON – 6 GeV/n SYNCHROPHASOTRON CO2 laser

=73 MeV/c =52 MeV/c 8 B 7 Be + p

10 С

7 Be/ 10 С/ 12 Nexposure 7 Be/ 10 С/ 12 N exposure

6 Li 7.5% 7 Li 92.5% 9 Be 100% 10 B 19.8% 11 B 80.2% 12 C 99% 7 Be 53 d 8 B 0.8 s 9 C 0.13 s 10 C 19 s 11 C 20 m 12 N 11 ms

Z=4 Z=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 Pb 10A GeV Au 1A GeV U

CONCLUDING REMARKS The 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 9 Be and 8 B 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 20 Ne

Диссоциация 8 В 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).

8 B: Total P T ( 7 Be+p) EMD whitestars n h0

4.5А GeV/c white stars 12 C3α 1 % of Inelastic Interactions

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

22 Ne 3.22A GeV 4100 Inelastic Interactions

6 He 807 ms 8 He 119 ms 12 Be 23 ms 12 B 20 ms 10 Be y 11 Be 13.8 s 8 Li 838 ms 9 Li 178 ms 11 Li 8.5 ms