Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....3...28s&link_type=abstract
Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o
Physics
Scientific paper
In recent publications, consistent cosmic ray Galactic confinement times have been reported from Ulysses HET measurements of 10 Be, 26 Al, 36Cl and 54 Mn. The abundances of other secondary radio-isotopes, specifically electron-capture isotopes, are a crucial test of cosmic ray reacceleration. Reacceleration is implicit in interstellar shock acceleration models, but its significance for interstellar propagation is largely unknown. Electron-capture is suppressed during interstellar propagation. However, if cosmic rays experience significant reacceleration, nuclei will have spent time at lower energies where electron pick-up, and hence electron capture, is more likely than at higher energies. Thus, electron capture secondary isotopes would be less abundant (and their daughters, more abundant) than otherwise predicted. The abundance ratio of 49V to 51V is a particularly sensitive test of this effect. The latest Ulysses HET data is used to address this problem.
Connell James J.
Simpson André J.
Sparvoli Roberta
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