Peripheral fragmentation of {sup 8}B nuclei in nuclear emulsion at an energy of 1.2 GeV per nucleon

• Published in: Physics of atomic nuclei 2007-07, Vol.70 (7)
• Main Authors: Stanoeva, R., Bradnova, V., Vokal, S., Zarubin, P. I., Zarubina, I. G., Kachalova, N. A., Kovalenko, A. D., Malakhov, A. I., Orlova, G. I., Peresadko, N. G., Rukoyatkin, P. A., Rusakova, V. V., Stan, E., Haiduc, M., Kharlamov, S. P., Tsakov, I., Shchedrina, T. V.
• Format: Article
• Language: English
• Subjects: BERYLLIUM 7; BINDING ENERGY; BORON 8; BRANCHING RATIO; CORRELATIONS; DISSOCIATION; DISTRIBUTION; EMULSIONS; FRAGMENTATION; GEV RANGE 01-10; MESONS; MULTIPLICITY; NUCLEAR DECAY; NUCLEAR EMULSIONS; NUCLEAR PHYSICS AND RADIATION PHYSICS; PERIPHERAL COLLISIONS; PROTONS; RELATIVISTIC RANGE; STARS; TRANSVERSE MOMENTUM
• ISSN: 1063-7788; 1562-692X
• DOI: 10.1134/S1063778807070113

The results obtained by studying the charge topology of fragments produced in the peripheral dissociation of relativistic {sup 8}B nuclei in emulsion are presented. Fifty-five events of the peripheral dissociation of a {sup 8}B nucleus in events where there was no production of target-nucleus fragments and mesons ('white stars') were selected. A leading contribution of the {sup 8}B {sup {yields}} {sup 7}Be + p mode, which has the lowest energy threshold, was revealed on the basis of these events. Information about the branching ratios for dissociation modes characterized by a higher multiplicity was obtained. The dissociation of the {sup 7}Be core in {sup 8}B bears resemblance to the dissociation of a free {sup 7}Be nucleus. The transverse-momentum distributions of fragments originating from the {sup 8}B {sup {yields}} {sup 7}Be + p dissociation mode were obtained. For these distributions, a small mean value of = 52 {+-} 5 MeV/c in the c.m. frame suggests a low binding energy of the outer proton in the {sup 8}B nucleus. An indication of a strong azimuthal correlation of the fragments {sup 7}Be and p was found.