Nucleosynthesis by Spallation Reactions in the Early Solar System - The Need for Spallation Cross Sections

Details Nucleosynthesis by Spallation Reactions in the Early Solar System - The Need for Spallation Cross Sections Nucleosynthesis by Spallation Reactions in the Early Solar System - The Need for Spallation Cross Sections

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..704..331l&link_type=abstract

TOURS SYMPOSIUM ON NUCLEAR PHYSICS V; Tours 2003. AIP Conference Proceedings, Volume 704, pp. 331-340 (2004).

Physics

Nuclear Physics

1

Cosmic Ray Nucleosynthesis, General, Solar Nebula, Cosmogony

Scientific paper

Ever since their discovery in 1960, the origin of the relatively short-lived radionuclides, now extinct but alive in the early solar system, has been under debate. Possible scenarios are either nucleosynthetic production in stellar sources, e.g. AGB stars, Wolf-Rayet stars, novae and supernovae, with subsequent injection into the solar nebula, or production by spallation reactions in the early solar system by energetic particles from the young sun. Here we present model calculations for the second scenario, the production of the relatively short-lived radionuclides by solar energetic particle events in the early solar system. For successful modeling the cross sections for proton-, 3He-, and 4He-induced reactions for all relevant nuclear reactions have to be known. In addition, the modeling depends on the relative fluence contributions of protons, 3He, and 4He in the solar energetic particle events as well as on their energy distribution. The ability of the model calculations to simultaneously describe the observed nuclide ratios 7Be/9Be, 10Be/9Be, 26Al/27Al, 41Ca/40Ca, 53Mn/55Mn, and 92Nb/93Nb is presented. Special emphasis is given to the problems arising from ill-known cross sections for 3He- and 4He-induced reactions.

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