The effect of cross-section uncertainties on the derivation of source abundances from cosmic-ray composition observationsIt is pointed out that the derivation of source abundances from the composition observed near the earth requires that the secondary contribution to the observed nuclidic abundances be calculated from a model of cosmic-ray propagation. A crucial element in such a calculation is the choice of nuclear fragmentation cross sections. Uncertainties in these cross sections give rise to uncertainties in the derived source abundances. It is shown here that the uncertainties in fragmentation cross sections can, in certain important cases, contribute significantly to the uncertainties in cosmic ray source abundances deduced from the observed composition. For this reason, it is essential that reliable estimates of the effect of cross section uncertainties be made when interpreting the source composition deduced from cosmic ray observations. In addition, formulas are presented which can be used to obtain such estimates with a minimum of computational effort.
Document ID
19830066542
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wiedenbeck, M. E. (California, University Berkeley, CA, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Subject Category
Space Radiation
Meeting Information
Meeting: Composition and origin of cosmic rays; Advanced Study Institute