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Transport methods and interactions for space radiationsThis report presents a brief history leading to the involvement of the Langley Research Center of the National Aeronautics and Space Administration (NASA) in space-radiation physics and protection. Indeed, a relatively complete summary of technical capability as of the summer of 1990 is given. The Boltzmann equations for coupled ionic and neutronic fields are presented and inversion techniques for the Boltzmann operator are discussed. Errors generated by the straight ahead approximation are derived and are shown to be negligible for most problems of space-radiation protection. A decoupling of projectile propagation from the target fields greatly simplifies the Boltzmann equations and allows an analytic solution of the target fragment transport. Analytic and numerical methods of solving the projectile transport equations are discussed. The nuclear physics underlying the coefficients in the Boltzmann equation is discussed. A coupled-channel optical model is found as a consequence of the loose binding of nuclear matter and closure of the nuclear states in high-energy reactions. Transport solutions with the developed data base are used with laboratory experiments to validate both the transport code and the data base. Numerical benchmarks and comparison with Monte Carlo calculations are also used for code validation.
Document ID
19950049844
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wilson, John W.
(NASA Langley Research Center Hampton, VA, US, United States)
Townsend, Lawrence W.
(NASA Langley Research Center Hampton, VA, US, United States)
Schimmerling, Walter
(Lawrence Berkeley Lab. Berkeley, CA, US, United States)
Khandelwal, Govind S.
(Old Dominion Univ. Norfolk, VA, US, United States)
Khan, Ferdous
(Old Dominion Univ. Norfolk, VA, US, United States)
Nealy, John E.
(NASA Langley Research Center Hampton, VA, US, United States)
Cucinotta, Francis A.
(NASA Langley Research Center Hampton, VA, US, United States)
Simonsen, Lisa C.
(NASA Langley Research Center Hampton, VA, US, United States)
Shinn, Judy L.
(NASA Langley Research Center Hampton, VA, US, United States)
Norbury, John W.
(Rider Coll., Lawrenceville, NJ US, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publisher: Plenum Press (NATO ASI Series A, Life Sciences Vol. 243B)
Subject Category
Space Radiation
Accession Number
95A81443
Distribution Limits
Public
Copyright
Other

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