Multifragmentation through Exotic Shape Nuclei in alpha(5GeV/u) + Au Reactions

Abstract

We simulate the fragmentation processes in the {$\alpha$~$+$~Au~} collisions at a bombarding energy of 5 GeV/u using the simplified RQMD approach plus the statistical decay model. We find from the simulation that the angular-distribution of the intermediate mass fragments has a sideward peak, more strongly in the transverse direction than in the beam-direction, when the intermediate nucleus formed by the dynamical process has an annular eclipse shape, which explains the experimental results.

Comments: 11pages, Rectex is used, 3 Color-Postscript figures are also available by request from tomo@hadron05.tokai.jaeri.go.jp