The beta(+) decay and cosmic-ray half-life of Mn-54

Details The beta(+) decay and cosmic-ray half-life of Mn-54 The beta(+) decay and cosmic-ray half-life of Mn-54

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icr..confq..19d&link_type=abstract

Presented at the International Cosmic-Ray Conference, Calgary, Ontario, 19-20 Jul. 1993

Physics

Beta Particles, Cosmic Rays, Half Life, Interstellar Space, Manganese Isotopes, Radioactive Decay, Atoms, Chronometers, Electrons, Germanium

Scientific paper

We performed a search for the beta(+) branch of Mn-54 decay. As a cosmic ray, Mn-54, deprived of its atomic electrons, can decay only via beta(+) and beta(-) decay, with a half-life of the order of 106 yr. This turns Mn-54 into a suitable cosmic chronometer for the study of cosmic-ray confinement times. We searched for coincident back-to-back 511-keV gamma-rays using two germanium detectors inside a Nal(Tl) annulus. An upper limit of 2 x 10-8 was found for the beta(+) decay branch, corresponding to a lower limit of 13.7 for the log ft value.

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