NDLI: Semiempirical fragmentation models on galactic cosmic ray transport calculations with hydrogen target

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Semiempirical fragmentation models on galactic cosmic ray transport calculations with hydrogen target

Content Provider	NASA Technical Reports Server (NTRS)
Author	Wilson, John W. Shinn, Judy L. Badavi, Francis F.
Copyright Year	1993
Description	Nuclear fragmentation cross sections of Silberberg and Tsao that are more accurate for a hydrogen target were implemented in the data base to replace those of Rudstam for a galactic cosmic ray transport code (HZETRN). Sample calculations were made for the transported galactic cosmic ray flux through a liquid hydrogen shield at solar minimum condition to determine the effect of such a change. The transported flux based on the Silberberg-Tsao semiempirical formalism contains fewer high-LET (linear energy transfer) components but more low-LET components than the results based on Rudstam's formalism: and this disparity deepens as the shield thickness increases. A comparison of the results obtained from using both energy-dependent and energy-independent cross sections of Silberberg and Tsao indicates that the energy-independent assumption results in an underestimation of high-LET flux above 100 keV/micron by approximately 40 percent for a 15-g/cm(sup 2) thickness of liquid hydrogen. Similar results were obtained in a previous study when both energy-dependent and energy-independent cross sections of Rudstam were considered. Nonetheless, the present study found that an energy-independent calculation would be best accomplished by using Rudstam's cross sections as done in the past for various engineering applications.
File Size	1037149
Page Count	22
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19940008790
Archival Resource Key	ark:/13960/t3pw1dm63
Language	English
Publisher Date	1993-08-01
Access Restriction	Open
Subject Keyword	Space Radiation Thickness Linear Energy Transfer Let Galactic Cosmic Rays Solar Activity Effects Radiation Shielding Liquid Hydrogen Nuclear Reactions Data Bases Fragmentation 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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