MULTINUCLEON TRANSFER STUDIES IN C-12+SR-88

摘要

vhoice Cross sections for multinucleon transfer reactions are measured at several angles in the reaction Sr-88(C-12,X) - X ranging from Be-9 to C-14 at an incident carbon-ion energy of 87.5 MeV. In case of single-nucleon transfer reactions, the measured angular distributions of cross sections in transition to the ground and low-lying states in the Sr-87,Sr-89 and Y-89 nuclei are described well in terms of finite-range DWBA calculations. The transfer probability obtained from the experiments to well-defined shell-model orbits forms the single-particle unit for evaluation of the mechanism in multinucleon transfer reactions. The analysis reveals a small enhancement of the transfer probability corresponding to a proton-pair stripping. The mechanism of one-step ''direct'' transfer of a cluster is predominant in deuteron and He-3 transfer reactions. However, the transfer of a neutron pair seems to proceed through a sequential transfer of two neutrons. [References: 27]