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Peripheral fragmentation of the $^8$B nuclei at an energy of 1.2A GeV in nuclear track emulsion

R. Stanoeva·V. Bradnova·S. Vokal·P. I. Zarubin·I. G. Zarubina·N. A. Kachalova·A. D. Kovalenko·A. I. Malakhov·G. I. Orlova·N. G. Peresadko·P. A. Rukoyatkin·V. V. Rusakova·E. Stan·M. Haiduc·I. Tsakov·S. P. Kharlamov
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Abstract

The results of investigations dealing with the charge topology of the fragments produced in peripheral dissociation of relativistic $^8$B nuclei in emulsion are presented. 55 events of peripheral dissociation of the $^8$B nucleus were selected from the events which do not involve the production of the target-nucleus fragments and mesons (`` white\rq\rq ~stars). A leading contribution of the $^8$B$\to^7$Be+p mode having the lowest energy threshold was revealed on the basis of those events. Information on the relative probability of dissociation modes with a larger multiplicity was obtained. The dissociation of a $^7$Be core in $^8$B indicates an analogy with that of the free $^7$Be nucleus.\par The transverse momentum distributions of the fragments from the $^8$B$\to^7$Be+p dissociation mode were obtained. Their small average value, $<$P$_t>$= 52 MeV/c, in the c.m.s. suggests a low binding energy of the external proton in the $^8$B nucleus. An indication for a strong azimuthal correlation of the $^7$Be and p fragments was got.

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R. Stanoeva, V. Bradnova, S. Vokal, P. I. Zarubin, I. G. Zarubina, N. A. Kachalova, A. D. Kovalenko, A. I. Malakhov, G. I. Orlova, N. G. Peresadko, P. A. Rukoyatkin, V. V. Rusakova, E. Stan, M. Haiduc, I. Tsakov, S. P. Kharlamov. 2006-10-17. Peripheral fragmentation of the $^8$B nuclei at an energy of 1.2A GeV in nuclear track emulsion. https://doi.org/10.1134/s1063778807070113

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