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

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

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993stin...9413263s&link_type=abstract

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Applications

Fragmentation, Galactic Cosmic Rays, Liquid Hydrogen, Nuclear Reactions, Radiation Shielding, Radiation Transport, Data Bases, Linear Energy Transfer (Let), Solar Activity Effects, Thickness

Scientific paper

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/cm2 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.

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