Elastic Scattering of 120, 145 and 172.5 MeV lpha -Particles by ¹²C, ²⁴Mg and ²⁷Al and Optical Model Analysis

摘要

The 120, 145 and 172.5 MeV lpha -particle beams from JULIC were used to measure differential cross sections for elastic scattering on ¹²C, ²⁴Mg and ²⁷Al in the angular range from about 5^circ to 70^circ (c.m. system). The angular distributions were analysed extensively in terms of the optical model using a variety of potential forms. Apart from the parametrized forms of potential, as Woods–Saxon (WS) or rather (WS)^u , also a model independent representation of potential (spline potential) was employed. The analysis based on the parametrized forms of the potential provided the possibility to find best fit parameter sets, which were then examined on their uniqueness and energy dependence. It has been of special interest to gain information on the radial shape of the potential.