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Radiation Protection Dosimetry 2004 110(1-4):57-60; doi:10.1093/rpd/nch153
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Radiation Protection Dosimetry Vol. 110 Nos. 1-4 © Oxford University Press 2004; all rights reserved

Double-differential light-ion production cross sections

T. M. Miller* and L. W. Townsend

Department of Nuclear Engineering, University of Tennessee, Knoxville, TN 37996-2300, USA

* Corresponding author: tmiller7{at}utk.edu

Codes used for space radiation shielding studies typically transport light-ions from the incident cosmic ray spectrum using either a one-dimensional straight-ahead approximation or in three dimensions, often without accounting for their breakup. Light-ions are also produced by breakup of energetic heavy ions in target materials. Herein, we present cross section models that can be used to predict double-differential light-ion production cross sections. Deuteron breakup is based on a parameterization of the total reaction cross sections. Alpha fragmentation utilizes a parameterization based on an abrasion–ablation model that has been augmented by experimental data. Neutron and proton production is modelled with a quantum mechanical abrasion–ablation–coalescence model. This same model is also used to predict cross sections for triton and 3He breakup. Finally, energies and emission angles for particles other than nucleons are specified using a model of energy degradation in nucleus–nucleus collisions and systematics of momentum distributions.


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