NDLI: Fully energy-dependent hzetrn (a galactic cosmic-ray transport code)

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Fully energy-dependent hzetrn (a galactic cosmic-ray transport code)

Content Provider	NASA Technical Reports Server (NTRS)
Author	Wilson, John W. Shinn, Judy L. John, Sarah Tripathi, Ram K. Norbury, John W. Townsend, Lawrence W.
Copyright Year	1992
Description	For extended manned space missions, the radiation shielding design requires efficient and accurate cosmic-ray transport codes that can handle the physics processes in detail. The Langley Research Center galactic cosmic-ray transport code (HZETRN) is currently under development for such design use. The cross sections for the production of secondary nucleons in the existing HZETRN code are energy dependent only for nucleon collisions. The approximation of energy-independent, heavy-ion fragmentation cross section is now removed by implementing a mathematically simplified energy-dependent stepping formalism for heavy ions. The cross section at each computational grid is obtained by linear interpolation from a few tabulated data to minimize computing time. Test runs were made for galactic cosmic-ray transport through a liquid hydrogen shield and a water shield at solar minimum. The results show no appreciable change in total fluxes or computing time compared with energy-independent calculations. Differences in high LET (linear energy transfer) spectra are noted, however, because of the large variation in cross sections at the low-energy region. The high LET components are significantly higher in the new code and have important implications on biological risk estimates for heavy-ion exposure.
File Size	779060
Page Count	22
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19930003832
Archival Resource Key	ark:/13960/t0zp8z26s
Language	English
Publisher Date	1992-11-01
Access Restriction	Open
Subject Keyword	Space Radiation Heavy Ions Galactic Cosmic Rays Collision Parameters Nucleons Radiation Shielding Applications Programs Computers Manned Space Flight Radiation Transport Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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