Other
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..apr..g604r&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, April 18-21, 1997, abstract #G6.04
Other
Scientific paper
The study of the origin of the light elements (Li, Be and B), particularly in old halo stars formed during the first billion years of Galactic evolution, provides unique information on cosmic ray origin. Of the 5 stable light isotopes, only Li-6, Be-9 and B-10 are almost totally cosmic rays produced. Li-7 has major contributions from nucleosynthesis in the Big Bang, and later on from nucleosynthesis in novae and from spallation by neutrinos in Type II supernovae (SNII). Neutrino spallation in SNII also contributes to B-11 production. The key feature of the study rests on the fact that the abundances of C and O (the main progenitors of B and Be) in the interstellar medium (ISM) of the early Galaxy were extremely low. Therefore, the bulk of the cosmic rays responsible for the production of B and Be must have been accelerated from freshly nucleosynthesized matter, most likely in Type II supernovae, before mixing in the ISM. But cosmic ray acceleration out of the ISM could have contributed significantly to Li-6 production via reactions of accelerated alpha particles with He. Thus, observations of Li-6 and Be-9 can provide information on these two cosmic ray components. The light element abundances are determined from observations with the Space Telescope and other instruments.
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