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DOI: 10.1134/S1063778807070137 4 P. Physics of Atomic Nuclei, 2007, Vol. 70, No. 7, pp. 1226–1229. At the JINR Nuclotron,  nuclei are accelerated. The charge-exchange reaction involving
these nuclei at an external target provides a secondary  GeV  beam. This beam is used to
irradiate emulsion chambers. The mean free path  cm for inelastic interactions
in an emulsion coincides within the errors with those for  and nuclei.
More than  % of the
events are associated with the peripheral interactions in which the total charge of the relativistic fragments
is equal to the charge of the nucleus and in which charged mesons are not produced. An unusual ratio
of the helium isotopes is revealed in the composition of the doubly charged fragments of the nucleus:
the number of the  fragments is twice as large as that of the  fragments.
Each of  % of peripheral
interaction events includes two doubly charged fragments. The channels of the fragmentation into
charged fragments are presented. In % of events, the fragmentation occurs only into charged
fragments without the emission of neutrons. The  channel dominates, whereas each of the
 and  channels constitutes 10%.
Two events without neutron emission are observed
in the  and  three-body channels.
The mean free path for the coherent dissociation
of relativistic nuclei into is equal to
 m. The main features of the fragmentation of
relativistic nuclei in such peripheral interactions are explained
by the two-cluster structure
of the nucleus.Download:
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