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An abrasion-ablation model description of galactic heavy-ion fragmentationThe fragmentation of high-energy galactic heavy ions by nuclear interactions with arbitrary target nuclei is described within the context of a simple abrasion-ablation fragmentation model. The abrasion part of the theory utilizes a quantum-mechanical formalism based upon an optical model potential approximation to the exact nucleus-nucleus multiple-scattering series. Nuclear charge distributions of the excited prefragments are calculated using either a hypergeometric distribution or a method based upon the zero-point oscillations of the giant dipole resonance. The excitation energy of the prefragment is estimated from the geometric clean-cut abrasion-ablation model. The decay probabilities for the various particle emission channels, in the ablation stage of the fragmentation, are obtained from the EVAP-4 Monte Carlo computer program. Elemental production cross sections for 1.88-GeV/nucleon iron colliding with carbon, silver, and lead targets are calculated and compared with experimental data and with the predictions from the semiempirical relations of Silberberg and Tsao.
Document ID
19840014328
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Townsend, L. W. (NASA Langley Research Center Hampton, VA, United States)
Wilson, J. W. (NASA Langley Research Center Hampton, VA, United States)
Norbury, J. W. (Old Dominion Univ.)
Bidasaria, H. B. (Old Dominion Univ.)
Date Acquired
September 4, 2013
Publication Date
April 1, 1984
Subject Category
Nuclear And High-Energy Physics
Report/Patent Number
NASA-TP-2305
NAS 1.60:2305
L-15763
Accession Number
84N22396
Funding Number(s)
PROJECT: RTOP 199-20-76-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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