Coupled-reaction-channel approach for molecular orbital phenomena of valence nucleons in heavy-ion collisions: The 12c + 13c system

Abstract

A complete coupled-reaction-channel method is applied to molecular orbital phenomena of the valence nucleon in the scattering of 12 C on 13 C, i.e. in elastic and inelastic transitions to the single-particle states of 13 C ∗ (gr., 1 2 − ; 3.086 MeV, 1 2 + ; 3.854 MeV, 5 2 + ) with consi 12 C core-exchange process. The system is analyzed with respect to the occurrence of higher-order transitions of the direct (inelastic) and transfer (core-exchange) processes of the valence nucleon in 13 C. It is found in the states of positive total parity that the transfer and direct processes act additively and lead to extreme higher-order steps of the multi-interactions, if the ground state (1p 1 2 ) and the excited states (2s 1 2 and 1d 5 2 ) are taken into account. Transitions between the excited subchannels show strong-coupling effects, which are due to the reorientations of the d 5 2 orbitals. The reoriented system couples to the ground channel ( l -parity mixing) so favourably that the multi-interaction series hardly converges. The consequence of these observations are discussed in terms of the formation of molecular nucleon orbitals based on the polarization and the hybridization of the original orbitals.