arXiv:nucl-th/9802027·v1·Nuclear Theory
Cascade-Exciton Model Analysis of Nucleon-Induced Fission Cross Sections of Lead and Bismuth at Energies from 45 to 500 MeV
A. V. Prokofiev (1) · S. G. Mashnik (2) · A. J. Sierk (2) ((1) V. G. Khlopin Radium Institute, St. Petersburg, Russia, (2) LANL, Los Alamos, NM)
Abstract
An extended version of the Cascade-Exciton Model (CEM) of nuclear reactions is applied to analyze nucleon-induced fission cross sections for Bi-209 and Pb-208 nuclei in the 45-500 MeV energy range. The available data on linear momentum transfer are analyzed as well. The results are compared with analytical approximations resulting from a comparative critical analysis of all available experimental data. Systematic discrepancies between calculations and experimental data are revealed. A modification of the CEM is proposed, which significantly improves the model predictions for projectile energies above 100 MeV.
Comments: 38 pages, 16 figures, 7 tables, LaTeX, submitted to Nucl. Sci. Eng