l-dependent resonance absorption in the optical model description of alpha particle elastic scattering

Abstract

The interaction of alpha particles with atomic nuclei is a useful tool for the investigation of the reaction mechanism and the structure of nucleus. Many experiments concerning the elastic scattering of alpha particles on atomic nuclei show some phenomena which are not fully understood [1-3]. Earlier investigations of the elastic alpha particle scattering from 12C [4, 5], ieO [4, 6], 20Ne [8], 24Mg [7, 8], 28Si [9, 10] and 40Ca [11-13] have revealed a strong energy dependence of the backward cross-section. The confrontation of theoretical predictions with the experiments shows that for these nuclei it is rather difficult to obtain good optical model fits to the elastic differential cross-sections in the full range of the scattering angles[…]