ELEMENTARY PARTICLES AND FIELDS Experiment Features of the 9 Be → → 2He Fragmentation in an Emulsion for an Energy of 1.2 A GeV

The results of investigation of the fragmentation of relativistic nuclei 9 Be in an emulsion, which is accompanied by the formation of two 1.2-A-GeV He fragments, are presented. The angular measurements of the 9 Be → 2He events are analyzed. The 9 Be → 8 Be + n fragmentation channel with the decay of 8 Be from the ground (0 + )a ndfirst excited (2 + ) states into a pair of α particles appears to be dominant.