Watt parameters for the Los Alamos Model : Subroutine getab
Abstract
Many neutron transport Monte-Carlo codes can randomly sample fission neutron energies from a Watt spectrum. The quality of simulations depends on how well the Watt spectrum represents the true energy spectrum of the fission neutrons, and on one's choice of the Watt parameters a and b. The energy spectra of fission neutrons have been calculated and tabulated for the neutron induced fission of 235,238U and 239Pu as a function of incoming neutron energy by Madland using the Los Alamos Model. Each of these energy spectra are mapped into time-of-flight space and fitted with a Watt spectrum. A subroutine getab has been written to interpolate these results, so that Watt a and b parameters can be estimated for all incoming neutron energies up to ~16 MeV.
Cite
@article{arxiv.1410.1769,
title = {Watt parameters for the Los Alamos Model : Subroutine getab},
author = {J. P. Lestone},
journal= {arXiv preprint arXiv:1410.1769},
year = {2014}
}
Comments
11 pages, 7 figures, 1 table, Los Alamos National Laboratory report LA-UR-07-6090