Peripheral fragmentation of the 8B 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
Abstract
The results of investigations dealing with the charge topology of the fragments produced in peripheral dissociation of relativistic 8B nuclei in emulsion are presented. 55 events of peripheral dissociation of the 8B nucleus were selected from the events which do not involve the production of the target-nucleus fragments and mesons (`` white ~stars). A leading contribution of the 8B7Be+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 7Be core in 8B indicates an analogy with that of the free 7Be nucleus. The transverse momentum distributions of the fragments from the 8B7Be+p dissociation mode were obtained. Their small average value, <Pt>= 52 MeV/c, in the c.m.s. suggests a low binding energy of the external proton in the 8B nucleus. An indication for a strong azimuthal correlation of the 7Be and p fragments was got.
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