HZETRN: neutron and proton production in quasi-elastic scattering of GCR heavy-ions

Citation
Mr. Shavers et al., HZETRN: neutron and proton production in quasi-elastic scattering of GCR heavy-ions, RADIAT MEAS, 33(3), 2001, pp. 347-353
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
RADIATION MEASUREMENTS
ISSN journal
1350-4487 → ACNP
Volume
33
Issue
3
Year of publication
2001
Pages
347 - 353
Database
ISI
SICI code
1350-4487(200106)33:3<347:HNAPPI>2.0.ZU;2-Q
Abstract
The development of transport models for radiation shielding design and eval uation has provided a series of deterministic computer codes that describe galactic cosmic radiation (GCR), solar particle events, and experimental be ams at particle accelerators. These codes continue to be modified to accomm odate new theory and improvements to the particle interaction database (Cuc inotta ct al., 1994, NASA Technical Paper 3472, US Government Printing Offi ce, Washington DC). The solution employed by the heavy-ion transport code H ZETRN was derived with the assumption that nuclear fragments are emitted wi th the same velocity as the incident ion through velocity conserving nuclea r interactions. This paper presents a version of the HZETRN transport code that provides a more realistic distribution of the energy of protons and ne utrons emitted from GCR interactions in shields. This study shows that the expected GCR dose equivalent is lower than previously calculated for water shields that are less than 110 g cm(-2) thick. Calculations of neutron ener gy spectra in low Earth orbit indicate substantial contributions from relat ivistic neutrons. (C) 2001 Elsevier Science Ltd. All rights reserved.