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Neutron Angular Scatter Effects in 3DHZETRN: Quasi-ElasticThe current 3DHZETRN code has a detailed three dimensional (3D) treatment of neutron transport based on a forward/isotropic assumption and has been compared to Monte Carlo (MC) simulation codes in various geometries. In most cases, it has been found that 3DHZETRN agrees with the MC codes to the extent they agree with each other. However, a recent study of neutron leakage from finite geometries revealed that further improvements to the 3DHZETRN formalism are needed. In the present report, angular scattering corrections to the neutron fluence are provided in an attempt to improve fluence estimates from a uniform sphere. It is found that further developments in the nuclear production models are required to fully evaluate the impact of transport model updates. A model for the quasi-elastic neutron production spectra is therefore developed and implemented into 3DHZETRN.
Document ID
20170004503
Acquisition Source
Langley Research Center
Document Type
Technical Publication (TP)
Authors
Wilson, John W.
(Old Dominion Univ. Norfolk, VA, United States)
Werneth, Charles M.
(NASA Langley Research Center Hampton, VA, United States)
Slaba, Tony C.
(NASA Langley Research Center Hampton, VA, United States)
Badavi, Francis F.
(Old Dominion Univ. Norfolk, VA, United States)
Reddell, Brandon D.
(NASA Johnson Space Center Houston, TX, United States)
Bahadori, Amir A.
(Kansas State Univ. Manhattan, KS, United States)
Date Acquired
May 9, 2017
Publication Date
March 1, 2017
Subject Category
Space Radiation
Report/Patent Number
NF1676L-26529
L-20794
NASA/TP-2017-219597
Funding Number(s)
WBS: WBS 651549.02.07.10
Distribution Limits
Public
Copyright
Public Use Permitted.
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