STUDY ON APPLICABILITY OF GLOBAL NEUTRON OPTICAL MODEL POTENTIALS TO A NUCLEAR MASS RANGE FROM SODIUM TO GOLD AND TO ENERGIES FROM 1 TO 50 MeV
Ship Research Institute
6-38-1 Shinkawa, Mitaka, Tokyo 181, Japan
Applicability of neutron optical model potentials was studied by comparing calculated results with experimental data on σt, σnon, dσel/dΩ, the s-wave and the p-wave neutron strength functions: S0 and S1, and the potential scattering radii R' for isotopes and elements in a wide mass range from sodium to gold. The quantities S0, S1 and R' were calculated at 10 keV; the quantities σt, σnon (or σcomp) and dσel/dΩ were calculated in a wide energy range from about 1 MeV to 50 MeV. The neutron OMPs considered in the present study were those potentials reported by Becchetti and Greenlees, Hilmore and Hodgson, Rapaport et. al., and by the, author. In the comparison, results of other author's analyses were taken into account as reference data. Conclusions are: (1) the potential by Wilmore and Hodgson has a tendency of overestimating the total cross section near 50 MeV, (2) the potential by Rapaport has a tendency of underestimating the total cross section near 50 MeV, (3) the Rapaport's potential seems to underestimate the nonelastic cross sections of nuclei with large mass numbers such as 181Ta and 197Au. (4) the potential by the author seems to be more advantageous as a global potential than the other potentials considered in the present study.
KEYWORDS: neutron, optical model potential, global, applicability, 50 MeV, σt, σnon, dσel/dΩ