Total Cross Sections for Neutron Nucleus Scattering

Ramsauer model is well known and widely applied to understand systematics of neutron nucleus total cross sections. In this work, we examined the role of nuclear effective radius parameter (r(0)) on Ramsauer model fits of neutron total cross sections. We examined the Ramsauer model global analysis of the experimental neutron total cross sections reported by W. P. Abfalterer, F. B. Bateman, et al., from 20 MeV to 550 MeV for nuclei ranging from Be to U. The global fits predict within +/- 8% deviation to data. It has been observed that a finer adjustment of r(0) parameter alone can give very good Ramsauer model description of neutron total Scattering data within +/- 4% deviation. The required,r0 values for Ramsauer model fits are provided as a function of nuclear mass number. In optical model study, we have modified the teal part of Koning-Deleroche potentials to fit the neutron total Cross sections using SCAT2 code, The modified potentials have a different energy dependence beyond 200 MeV of neutron energy and fit the neutron total cross sections from C to Bi.