Fragmentation channels of relativistic 7Be nuclei in peripheral interactions
Abstract
Nuclei of 7Li were accelerated at the JINR Nuclotron. After the charge-exchange reaction involving these nuclei at an external target a second 7Be beam of energy 1.23A GeV was formed. This beam was used to expose photo-emulsion chambers. The mean free path for inelastic 7Be interactions in emulsion λ=14.00.8 cm coincides within the errors with those for 6Li and 7Li nuclei. More than 10% of the 7Be events are associated with the peripheral interactions in which the total charge of the relativistic fragments is equal to the charge of the 7Be and in which charged mesons are not produced. An unusual ratio of the isotopes is revealed in the composition of the doubly charged 7Be fragments: the number of 3He fragments is twice as large as that of 4He fragments. In 50% of peripheral interactions, a 7Be nucleus decays to two doubly charged fragments. The present paper gives the channels of the 7Be fragmentation to charged fragments. In 50% of events, the 7Be fragmentation proceeds only to charged fragments involving no emission of neutrons. Of them, the 3He+4He channel dominates, the 4He+d+p and 6Li+pchannels constitute 10% each. Two events involving no emission of neutrons are registered in the 3-body 3He+t+p and 3He+d+d channels. The mean free path for the coherent dissociation of relativistic 7Be nuclei to 3He+4He is 71 m. The particular features of the relativistic 7Be fragmentation in such peripheral interactions are explained by the 3He+4He 2-cluster structure of the 7Be nucleus.
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