Neutron-Photon Multigroup Cross Sections for Neutron Energies ?60 MeV
- 1 March 1979
- journal article
- research article
- Published by Taylor & Francis in Nuclear Science and Engineering
- Vol. 69 (3) , 378-388
- https://doi.org/10.13182/NSE79-A19956
Abstract
Multigroup cross sections (47 n groups, 21 gamma-ray groups) in ANISN format for neutron energies from thermal to 60 MeV and for the elements hydrogen, 10B, 11B, carbon, oxygen, silicon, calcium, chromium, iron, and nickel are described. A P5 Legendre expansion is used at energies ⩾14.9 MeV, and a P3 Legendre expansion is used at energies ⩽ 14.9 MeV. Below 14.9 MeV, the cross sections are from the Radiation Shielding Information Center’s fusion energy cross-section library. Above this energy, differential elastic scattering cross-section data from optical model calculations are used, and differential nonelastic scattering data from the intranuclear-cascade-evaporation model are used. Calculated results of the dose equivalent versus depth in the shield from a point isotropic source at the center of a 366-cm-thick spherical shell heavy concrete (density = 3.6 g cm−3) shield are presented. The energy distribution of the source neutrons is approximately that from a Li(D, n) neutron radiation damage facility.Keywords
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