Physics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icar...54..406r&link_type=abstract
Icarus (ISSN 0019-1035), vol. 54, June 1983, p. 406-416.
Physics
12
Cosmic Rays, Interstellar Matter, Proton Irradiation, Recoilings, Spallation, Argon Isotopes, Energetic Particles, Momentum, Particle Interactions, Particle Size Distribution, Spallation, Interstellar Dust, Irradiation, Cosmic Rays, Protons, Size, Models, Grains, Density, Recoil, Momentum, Argon 38, Calculations, Production Rate, Ages, Inclusions, Procedure
Scientific paper
The importance of recoil loss for the retention of spallation products in submicrometer-sized interstellar dust, during high energy cosmic ray proton irradiation, is presently calculated by means of a model which incorporates range straggling effects, a realistic distribution of interstellar grain sizes, and an accurate theoretical formalism for the fragmentation recoil moments. It is found that, even allowing for a five-fold variation of density values, the retention against recoil is substantial. Retentivities for the spallation reactions contributing to Ar-38 are calculated and employed to deduce an interstellar spallogenic production rate. The limitations of theoretical and experimental efforts preclude conclusive statements concerning interstellar grain survival.
Ray Jaideep
Völk Heinrich J.
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