Cosmic-ray half-life of 56Ni

Details Cosmic-ray half-life of 56Ni Cosmic-ray half-life of 56Ni

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phrvc..59.3393z&link_type=abstract

Physical Review C (Nuclear Physics), Volume 59, Issue 6, June 1999, pp.3393-3396

Physics

Nuclear Physics

3

Lifetimes, Cosmic Ray Nucleosynthesis, 39<=A<=58, Cosmic Rays

Scientific paper

The positron decay partial half-life of 56Ni is needed to employ this isotope as a cosmic-ray chronometer. We conducted an experiment by counting a purified 2.8-μCi source of 56Ni in GAMMASPHERE in order to search for the β+-decay branch of this isotope. A plastic scintillator was used to measure the energy of positrons in coincidence with the positron-annihilation γ rays and the characteristic 158-keV γ ray line. A careful analysis of 96 h of source counting shows no net signal and results in an upper limit of 77 counts of 511-511-158 keV plus scintillator coincident events. From this result we establish a 1σ upper limit on the branch for this decay mode to be (6.3×10-5)%. The discrepancy between the outcome of this experiment and previous measurements of this branch and the implications of this result for the 56Ni cosmic-ray chronometer problem are discussed.

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