Galactic Confinement Time of Iron-Group Cosmic Rays Derived from the 54Mn Chronometer

Details Galactic Confinement Time of Iron-Group Cosmic Rays Derived from the 54Mn Chronometer Galactic Confinement Time of Iron-Group Cosmic Rays Derived from the 54Mn Chronometer

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phrvl..79.4306z&link_type=abstract

Physical Review Letters, Volume 79, Issue 22, December 1, 1997, pp.4306-4309

Astronomy and Astrophysics

Astrophysics

11

Scientific paper

The β-decay half-life of 54Mn is needed to employ this isotope as a cosmic ray chronometer. We have determined the partial half-life of 54Mn for positron emission by counting a highly purified 35-μCi source of 54Mn in GAMMASPHERE to search for the astrophysically interesting β+ decay branch through the observation of coincident positron-annihilation γ rays. A careful analysis of 97 hours of source counting and 61 hours of background shows a net signal of 24+/-10 back-to-back 511-511 keV coincident events. Based on this result, the branch for this decay mode is \(2.2+/-0.9\)×10-7%. The implications of this result for the 54Mn cosmic-ray chronometer problem are discussed.

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