Clustering features of ${}^9$Be, ${}^{14}$N, ${}^7$Be, and ${}^8$B nuclei in relativistic fragmentation

Abstract

Recent studies of clustering in light nuclei with an initial energy above 1 A GeV in nuclear treack emulsion are overviewed. The results of investigations of the relativistic ${}^9$Be nuclei fragmentation in emulsion, which entails the production of He fragments, are presented. It is shown that most precise angular measurements provided by this technique play a crucial role in the restoration of the excitation spectrum of the $\alpha$ particle sysytem. In peripheral interactions ${}^9$Be nuclei are dissociated practically totally through the 0${}^{+}$ and 2${}^{+}$ states of the ${}^8$Be nucleus. The results of investigations of the dissociation of a ${}^{14}$N nucleus of momentum 2.86 A GeV/c in emulsion are presented as example of more complicated system. The momentum and correlation characteristics of $\alpha$ particles for the ${}^{14}$N$\to 3\alpha +X$ channel in the laboratory system and the rest systems of 3$\alpha$ particles were considered in detail. Topology of charged fragments produced in peripheral relativistic dissociation of radioactive ${}^8$B, ${}^7$Be nuclei in emulsion is studied.

14 pages, 6 figures, 4 tables, International Symposium on Exotic Nuclei (EXON-2006), 17-22 July, 2006, Khanty-Mansiysk, Russia