A Search for Bound-state Beta Decay of {}193Ir in the Galactic Cosmic Rays

Details A Search for Bound-state Beta Decay of {}193Ir in the Galactic Cosmic Rays A Search for Bound-state Beta Decay of {}193Ir in the Galactic Cosmic Rays

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....3...25w&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

Bound-state beta decay ( b decay) is an uncommon beta decay mode in which the electron is emitted into a bound atomic state rather than into the continuum. Because of the exclusion principle, the final atomic state must be initially empty, so isotopes which can only decay by b decay are stable as neutral atoms. However, when completely ionized as in the galactic cosmic rays, these isotopes can decay. The isotope 193 Ir has been predicted to undergo b decay. 193 Ir is the most abundant isotope of iridium in the Solar System. The results from the Trek detector suggest a depletion of iridium in the galactic cosmic rays. Such a signal would be consistent with the b decay of this isotope. This would be only the third example of b decay ever observed and the first observation in a natural system.

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