Cosmic ray measurement of the 54Mn β- partial half-life

Details Cosmic ray measurement of the 54Mn β- partial half-life Cosmic ray measurement of the 54Mn β- partial half-life

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996phrvc..54.2134d&link_type=abstract

Physical Review C (Nuclear Physics), Volume 54, Issue 5, November 1996, pp.R2134-R2137

Physics

Nuclear Physics

4

Lifetimes, Relation With Nuclear Matrix Elements And Nuclear Structure, Cosmic Rays

Scientific paper

In the fully stripped cosmic rays, the electron capture decay of 54Mn (τ1/2=312d) is strongly suppressed. In this situation the β- decay channel dominates; however, this half-life has never been measured in the laboratory. Some lower limits have been placed on it previously. Using the cosmic-ray data from the Ulysses spacecraft high-energy telescope (HET) and a self-consistent model of the galactic transport of cosmic rays, this partial lifetime can be determined. The best-fit β- partial decay lifetime is dependent on the interstellar gas density, but is constrained to be between 1-2×106 yr. This is consistent with, but much more restrictive than, earlier limits placed on the lifetime (>~3×104 and >~2.95×105 yr) from direct and indirect methods, respectively. This determination using the cosmic-ray data requires laboratory verification for which there appears to be interest.

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