Peripheral Fragmentation of 8В Nuclei in Nuclear Emulsion at an Energy of 1.2 GeV per NucleonR. Stanoeva, V. Bradnova, S. Vokal, etc,
6 P.
Physics of Atomic Nuclei, 2007, Vol. 70, No. 7, pp. 1216–1221.
The results obtained by studying the charge topology of fragments produced in the peripheral
dissociation of relativistic
nuclei in emulsion are presented. Fifty-five events of the peripheral dissociation
of a
nucleus in events where there is no production of target-nucleus fragments and mesons
(“white” stars) were selected. A leading contribution of the
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
core in
bears resemblance to the dissociation of a free
nucleus.
The transverse-momentum distributions
of fragments originating from the
dissociation mode were obtained.
For these distributions,
a small mean value of
MeV/c in the c.m. frame suggests a low binding energy of the outer
proton in the
nucleus. An indication of a strong azimuthal correlation of the fragments
and
was
found.