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HZETRN: Description of a free-space ion and nucleon transport and shielding computer programThe high-charge-and energy (HZE) transport computer program HZETRN is developed to address the problems of free-space radiation transport and shielding. The HZETRN program is intended specifically for the design engineer who is interested in obtaining fast and accurate dosimetric information for the design and construction of space modules and devices. The program is based on a one-dimensional space-marching formulation of the Boltzmann transport equation with a straight-ahead approximation. The effect of the long-range Coulomb force and electron interaction is treated as a continuous slowing-down process. Atomic (electronic) stopping power coefficients with energies above a few A MeV are calculated by using Bethe's theory including Bragg's rule, Ziegler's shell corrections, and effective charge. Nuclear absorption cross sections are obtained from fits to quantum calculations and total cross sections are obtained with a Ramsauer formalism. Nuclear fragmentation cross sections are calculated with a semiempirical abrasion-ablation fragmentation model. The relation of the final computer code to the Boltzmann equation is discussed in the context of simplifying assumptions. A detailed description of the flow of the computer code, input requirements, sample output, and compatibility requirements for non-VAX platforms are provided.
Document ID
19950022109
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Wilson, John W.
(NASA Langley Research Center Hampton, VA, United States)
Badavi, Francis F.
(Christopher Newport Coll. Newport News, VA., United States)
Cucinotta, Francis A.
(NASA Langley Research Center Hampton, VA, United States)
Shinn, Judy L.
(NASA Langley Research Center Hampton, VA, United States)
Badhwar, Gautam D.
(NASA Lyndon B. Johnson Space Center Houston, TX., United States)
Silberberg, R.
(Universities Space Research Association Washington, DC., United States)
Tsao, C. H.
(Naval Research Lab. Washington, DC., United States)
Townsend, Lawrence W.
(NASA Langley Research Center Hampton, VA, United States)
Tripathi, Ram K.
(Christopher Newport Coll. Newport News, VA., United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1995
Subject Category
Space Radiation
Report/Patent Number
NASA-TP-3495
L-17417
NAS 1.60:3495
Accession Number
95N28530
Funding Number(s)
PROJECT: RTOP 199-45-16-11
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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