Ultra-Heavy Galactic Cosmic Ray Abundances Measured with the TIGER Instrument

Details Ultra-Heavy Galactic Cosmic Ray Abundances Measured with the TIGER Instrument Ultra-Heavy Galactic Cosmic Ray Abundances Measured with the TIGER Instrument

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..apr.t9003l&link_type=abstract

American Physical Society, April Meeting, 2003, April 5-8, 2003 Philadelphia, Pennsylvania, MEETING ID: APR03, abstract #T9.003

Physics

Scientific paper

The Trans-Iron Galactic Element Recorder (TIGER) was launched in December 2001 and flew for 32 days aboard a long-duration balloon flight from McMurdo Base in Antarctica. The objective of this experiment is to measure the elemental abundances of galactic cosmic ray nuclei with charge between Z=20 and Z=40. Our data contains approximately 370,000 iron events and shows clear peaks for Zn (Z=30), Ga (Z=31), Ge (Z=32), As (Z=33), and Se (Z=34). These data represent the best statistical measurements to date with an instrument having sufficient resolution to resolve odd-Z nuclei. Our preliminary elemental abundances will be presented and compared with predicted abundances from a hot interstellar atmosphere source model (first-ionization potential enhancement) and from a cold dust source model (refractory element enhancement).

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