Reinvestigation of 56Ni decay

Details Reinvestigation of 56Ni decay Reinvestigation of 56Ni decay

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phrvc..42..573s&link_type=abstract

Physical Review C (Nuclear Physics), Volume 42, Issue 2, August 1990, pp.573-580

Physics

Nuclear Physics

10

Beta Decay, Double Beta Decay, Electron And Muon Capture, 39<=A<=58

Scientific paper

In a series of experiments, we have reinvestigated the decay of the doubly magic nucleus 56Ni, which is believed to be copiously produced in supernovae. We have confirmed its previously known decay scheme and half-life, and have searched for several rare decay modes. We establish an upper limit of 5.8×10-7 for the branching ratio of the second forbidden unique β+ decay to the 158-keV level in 56Co, leading to a lower limit of 2.9×104 yr for the half-life of fully ionized 56Ni nuclei in cosmic rays. We also establish an upper limit of 5.0×10-3 for the branching ratio of the isospin forbidden Fermi electron capture transition to the 1451-keV level in 56Co, which in turn leads to an upper limit of 124 keV for the isospin mixing Coulomb matrix element of the 56Ni ground state.

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