Study of Isotopic Effects in Capture Process

Abstract

Recently, many experimental and theoretical efforts have been devoted to the investigation of fusion, fission, and capture processes at sub-barrier energies [1–4]. Measurements of excitation functions down to the extreme sub-barrier energies are important for studying the long range behavior of the nucleus–nucleus interaction. The experimental data obtained are also of interest for solving astrophysical problems related to nuclear synthesis. The main objective of the present work is to study the isotopic dependencies of the capture cross section and the mean-square angular momentum in the reactions 48Ca + 144,150,154Sm and 40Ca + 154Sm. The quantum diffusion approach [3, 4] is employed. The collisions of nuclei are treated in terms of a single dynamic collective coordinate, the relative distance between the colliding nuclei. Our approach takes into consideration the fluctuation and dissipation effects in collisions of heavy ions that model the coupling with various channels [3, 4]. The deformation and neutron transfer effects are taken into account through the dependence of the nucleus–nucleus potential on the deformations and orientations of interacting deformed nuclei.