Effect of clustering on the emission of light charged particles

摘要

Energy spectra of light charged particles emitted in the reaction p + (27) Al - Si-28* have been studied and compared with statistical model calculation. Unlike O-16 + C-12 where a large deformation was observed in Si-28*, the energy spectra of alpha-particles were well explained by the statistical model calculation with standard "deformability parameters" obtained using the rotating liquid drop model. It seems that the alpha-clustering in the entrance channel causes extra deformation in Si-28* in the case of O-16 + C-12, but the reanalysis of other published data shows that there are several cases where extra deformation was observed for composites produced via non-alpha-cluster entrance channels also. An empirical relation was found between mass-asymmetry in the entrance channel and deformation, which indicates that along with alpha-clustering, mass-asymmetry may also affect the emission of a light charged particle.