The results of investigations of the relativistic 9 Be nucleus fragmentation in emulsion which entails the production of two He fragments of an energy of 1.2 A GeV are presented. The results of the angular measurements of the 9 Be→2He events are analyzed. The 9 Be→ 8 Be+n fragmentation channel involving the 8 Be decay from the ground (0 + ) and the first excited (2 + ) states to two α particles is observed to be predominant.
Experimental data on fragmentation channels in peripheral interactions of 8 B nuclei in nuclear track emulsions are presented. A detailed analysis made it possible to justify selections of events of the electromagnetic-dissociation process 8 B → 7 Be + p and to estimate its cross section. Events of 10 C peripheral dissociation that were observed in the same exposure are described.
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