Special features of the $^9$Be$\to$2He fragmentation in emulsion at an   energy of 1.2~A~GeV
  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$\to$2He events are analyzed.   The $^9$Be$\to^8$Be+n fragmentation channel involving the $^8$Be decay from the ground (0$^+$) and the first excited (2$^+$) states to two $\alpha$ particles is observed to be predominant. 
D.A. Artemenkov, V. Bradnova, M.M. Chernyavsky, N.A. Kachalova, A.D.   Kovalenko, M. Haiduc, A.I. Malakhov, G.I. Orlova, P.A...