A role of the unstable nuclei 6 Be, 8 Be and 9 B in the dissociation of relativistic nuclei 7,9 Be, 10 B and 10,11 C is under study on the basis of nuclear track emulsion exposed to secondary beams of the JINR Nuclotron. Contribution of the configuration 6 Be + n to the 7 Be nucleus structure is 8 ± 1% which is near the value for the configuration 6 Li + p. Distributions over the opening angle of α-particle pairs indicate to a simultaneous presence of virtual 8 Be g.s. and 8 Be 2 + states in the ground states of the 9 Be and 10 C nuclei. The core 9 B is manifested in the 10 C nucleus with a probability of 30 ± 4%. Selection of the 10 C "white" stars accompanied by 8 Be g.s. ( 9 B) leads to appearance in the excitation energy distribution of 2α2p "quartets" of the distinct peak with a maximum at 4.1 ± 0.3 MeV. 8 Be g.s. decays are presented in 24 ± 7% of 2He + 2H events of the 11 C coherent dissociation and 27 ± 11% of the 3He ones. The channel 9 B + H amounts 14 ± 3%.The 8 Be g.s. nucleus is manifested in the coherent dissociation 10 B → 2He + H with a probability of 25 ± 5% including 14 ± 3% of 9 B decays. A probability ratio of the mirror channels 9 B + n and 9 Be + p is estimated to be 6 ± 1.PACS numbers: 21.60. Gx, 29.40.Rg * Electronic address: zarubin@lhe.jinr.ru 1 arXiv:1607.08020v1 [nucl-ex]
We analyze the self-similarity approach applied to study the hadron production in pp and AA collisions. This approach allows us to describe rather well the ratio of the proton to anti-proton yields in A-A collisions as a function of the energy at a wide range from a few GeV to a few TeV. We suggest a modification of this approach to describe rather well the inclusive spectra of hadrons produced in pp collisions at different initial energies from the AGS to LHC.
The results of investigations of the relativistic 9 Be nucleus fragmentation in emulsion which entails the production of two He fragments of an energy of 1.2 A GeV are presented. The results of the angular measurements of the 9 Be→2He events are analyzed. The 9 Be→ 8 Be+n fragmentation channel involving the 8 Be decay from the ground (0 + ) and the first excited (2 + ) states to two α particles is observed to be predominant.
Experimental data on fragmentation channels in peripheral interactions of 8 B nuclei in nuclear track emulsions are presented. A detailed analysis made it possible to justify selections of events of the electromagnetic-dissociation process 8 B → 7 Be + p and to estimate its cross section. Events of 10 C peripheral dissociation that were observed in the same exposure are described.
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