The Beryllium Age Observable at the Boundary of the Solar Cavity

Details The Beryllium Age Observable at the Boundary of the Solar Cavity The Beryllium Age Observable at the Boundary of the Solar Cavity

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....4..156c&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

The measurement of the unstable-to-stable isotopic ratio, 10B e/B e, allows the determination of the beryllium age and the delimitation of the ages of other stable spallation secondaries. A calculation of the beryllium age observable in the local galactic zone is presented. The calculation utilizes the observational data on the galactic magnetic field and the dimension of the disk. A uniform source distribution of the parent ions generating beryllium isotopes in the disk and a uniform interstellar gas density are relevant assumptions of the calculation. The ages of stable beryllium isotopes, 7 Be and 9Be, resulting from this calculation are less than 4 x 106 years above 1 GeV/u in the spiral field. This value disagrees with the longer age of about 15 x 106 years, derived from the measured 10 B e/B e ratios elaborated in the context of the Leaky Box Model . An explanation for the origin of this difference is attempted.

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