The ^11B/^10B Ratio in the Interstellar Medium

Details The ^11B/^10B Ratio in the Interstellar Medium The ^11B/^10B Ratio in the Interstellar Medium

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5877f&link_type=abstract

HST Proposal ID #5877

Physics

Hst Proposal Id #5877 Interstellar Medium

Scientific paper

We propose to measure the local interstellar ^11B/^10B ratio with the GHRS. These observations will provide the first measurements of the boron isotopic ratio beyond the solar system. The solar system ratio requires a source that enhances the ^11B/^10B ratio over that expected from spallation. Additional spallation via low energy galactic cosmic rays, whose flux is not directly measurable, may be the source. We will determine this flux from our data, and we will study the consequences of the derived flux on interstellar chemical processes and thermodynamics. Since production of ^11B is also possible in supernovae, our flux will be an upper limit.

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