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Light Ion Double-Differential Cross Sections for Space RadiationNeutrons and light ions have been shown to make large contributions to space radiation dose equivalent for realistic shielding scenarios. However, there are considerable uncertainties in the calculation of light ion production. Efficient and accurate calculation of light ion double-differential cross sections are required for input into space radiation transport codes. A thermal proton cross section model is developed which includes proton production from the 3 sources of projectile, central fireball, and target. It is shown that this 3-source model is able to explain the low-momentum, small-angle shoulder seen in proton spectra. Using the coalescence model, the thermal proton model is used to calculate light ion double-differential cross sections for use in space radiation transport codes. The 3-source model is also seen to be essential to explain the light ion shoulders, which are even more pronounced than the proton shoulders. Extensive comparisons between models and experimental measurements are shown and necessary future work is discussed.
Document ID
20180006313
Acquisition Source
Langley Research Center
Document Type
Technical Publication (TP)
Authors
Norbury, John W. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
October 16, 2018
Publication Date
July 1, 2018
Subject Category
Space Radiation
Report/Patent Number
L-20937
NASA/TP-2018-220077
NF1676L-30555
Funding Number(s)
WBS: WBS 089407.01.23
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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