Fusion and elastic scattering of ⁶Li + ⁵⁸Ni at low energies

¹ Departamento de Aceleradores, Instituto Nacional de Investigaciones Nucleares, Apartado Postal 18-1027, Código Postal 11801, México, Distrito Federal, México
² Physics Department, University of Notre Dame, Notre Dame, Indiana, 46556-5670, USA

^* e-mail: eli.aguilera@inin.gob.mx

Published online: 22 November 2017

Abstract

Sub-barrier fusion cross sections (σ_fus) for the ⁶Li + ⁵⁸Ni system, obtained from the respective evaporation protons, are examined in the present work. With respect to expectations of a simple one-dimensional barrier penetration model, a large enhancement of the data is observed. Good consistency with equivalent data reported previously for similar systems is found. A comparison with total reaction cross sections (σ_R), deduced from elastic scattering measurements reported previously, indicates that σ_fus is close to σ_R within the measured energy range. To estimate the contribution of complete fusion (CF), an optical model analysis of the elastic scattering data is performed where CF is identified with the absorption in a short range volume potential. A surface polarization potential is added to the bare nuclear potential to simulate the effect of peripheral reactions. The results obtained indicate that other mechanisms different from CF may be dominant, especially in the lower energy region.