Nuclear data libraries for incident neutrons and protons to 150 MeV in ENDF- 6 format

摘要

As part of the Accelerator Production of Tritium (APT) program, an effort is underway at Los Alamos National Laboratory to develop nuclear data libraries for incident neutrons and protons to 150 MeV. The libraries will be used in the MCNP Monte Carlo code with appropriate linking to higher energy calculations with the LAHET intranuclear cascade code. The data code system will be used for design of an accelerator-based facility to produce tritium, and will provide information required for analysis of system performance, induced radiation doses, material activation, heating, damage, and shielding analysis. Because of their completeness, the libraries will also be useful for other accelerator- driven applications and for medical, shielding, and space applications at higher energies. The libraries are based primarily on nuclear model calculations with the GNASH reaction theory code, including thorough benchmarking of the model calculations against experimental data. All evaluations are in ENDF-6 format and include specification of production cross sections for light particles, gamma rays, and heavy recoil particles, energy angle correlated spectra for secondary light particles, and energy spectra for gamma rays and heavy recoil nuclei. The neutron evaluations are combined with ENDF/B-VI evaluations below 20 MeV. To date, neutron and proton evaluations have been completed for (sup 2)H, (sup 12)C, (sup 14)N, (sup 16)O, (sup 27)Al, (sup 28,29,30)Si, (sup 40)Ca, (sup 50,52,53,54)Cr, (sup 54,56,57,58)Fe, (sup 58, 60,61,62,64)Ni, (sup 182,183,184,186)W, and (sup 206,207,208)Pb.