Resonances in 26Al, 29Si and 30Si: Are they entrance channel dependent?

Abstract

One of the most interesting and fundamental challenges to arise from the study of heavy-ion collisions at bombarding energies well above the Coulomb barrier is that of understanding and describing the nature and properties of the compound nucleus. Indeed, the validity of the classical conception of an equilibrated, long-lived nucleus in which all nucleons share the available energy and angular momentum must be questioned in the regime of high excitation energies ~E~ available to experimentalists today. The occurrence of resonances in many lighter heavy-ion systems has served to focus a great deal of attention on this question since it is not altogether clear whether resonances are a signature of compound nucleus formation or depend mostly upon the entrance and/or exit channels. The work presented in this paper addresses the compound nucleus versus entrance channel effect aspect of heavy-ion reactions by searching for resonances correlated in different entrance channels leading to the same compound nucleus.