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

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

2006-05-15

arxiv.org/abs/nucl-ex/0605013v3

Phys.Atom.Nucl.70:1216-1221,2007

Physics

Nuclear Physics

Nuclear Experiment

13 pages, 4 figures, 2 tables, conference: Conference on Physics of Fundamental Interactions, Moscow, Russia, 5-9 Dec 2005

Scientific paper

10.1134/S1063778807070113

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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