Light-charged-particle emission from hot S-32* formed in Ne-20+C-12 reaction

Abstract

Inclusive energy distributions for light charged particles (p, d, t and alpha) have been measured in the Ne-20 (158, 170, 180, 200MeV)+ C-12 reactions in the angular range 10 degrees-50 degrees. Exclusive light-charged-particle energy distribution measurements were also done for the same system at 158MeV bombarding energy by in-plane light charged particle - fragment coincidence. Pre-equilibrium components have been separated out from proton energy spectra using the moving source model considering two sources. The data have been compared with the predictions of the statistical model code CASCADE. It has been observed that significant deformation effects were needed to be introduced in the compound nucleus in order to explain the shape of the evaporated d, t energy spectra. For protons, evaporated energy spectra were rather insensitive to nuclear deformation, though angular distributions could not be explained without deformation. The decay sequence of the hot S-32 nucleus has been investigated through exclusive light-charged-particle measurements using the Ne-20 (158MeV)+ C-12 reaction. Information on the sequential decay chain has been extracted through a comparison of the experimental data with the predictions of the statistical model. It is observed from the present analysis that exclusive light-charged-particle data may be used as a powerful tool to probe the decay sequence of hot light compound systems.