Heavy-Ion Resonance and Multi-Cluster Structure of Nuclei

Abstract

New kind of heavy-ion resonances recently discovered in nuclear collisions of C+C and O+O systems leading to various multi-cluster exit channels, such as C+C →3α+12C, 3α+3α, 2α+O and O+O → (α+C)+O, (α+C)+(α+C), are studied theoretically by the coupled-channel (CC) and coupled-channel Born approximation (CCBA) calculations using microscopic cluster-model wave functions of the colliding nuclei, C and O, and the nucleus-nucleus interactions based on the realistic G-matrix interaction. These resonance states correspond to highly excited states of the compound systems, Mg and S nuclei, at excitation energies more than 40∼55 MeV, having the associated multi-cluster structures and large decay widths to these reaction channels. In this talk, we show that characteristic features of these newly-found resonances as well as those of the classical resonances of di-nucleus molecular nature are well reproduced by the microscopic CC and CCBA calculations. The reaction mechanism leading to the formation of these exotic resonances is also discussed in some detail for the O+O → (α+C)+O, (α+C)+(α+C) and C+C → Be+O reactions.