Clustering features of the ${}^7$Be nucleus in relativistic fragmentation

Charge topology of fragmentation of 1.2 A GeV ${}^7$Be nuclei in nuclear track emulsion is presented.The dissociation channels ${}^4$He + ${}^3$He, 2${}^3$He+ n, ${}^4$He + 2${}^1$H are considered in detail. It is established that the events ${}^6$Be + n amount about to 27 % in the channel ${}^4$He + 2${}^1$H.