Cosmic-ray half-life of 144Pm

Details Cosmic-ray half-life of 144Pm Cosmic-ray half-life of 144Pm

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phrvc..57.2046z&link_type=abstract

Physical Review C (Nuclear Physics), Volume 57, Issue 4, April 1998, pp.2046-2048

Physics

Nuclear Physics

Cosmic Ray Nucleosynthesis, 90<=A<=149, Lifetimes, Gamma Transitions And Level Energies

Scientific paper

In order to test the possibility of using 144Pm as a clock to measure the mean cosmic-ray confinement time in the Galaxy, we counted a highly purified 1.4 μCi source of this isotope in GAMMASPHERE and searched for its astrophysically interesting β+ decay branch through the observation of positron-annihilation γ rays in coincidence with the characteristic 697-keV γ ray. Analysis of 57 h of source counting and 15 h of background shows no net signal and results in an upper limit of 3.7 of 511-511-697 keV coincident events. From this result we establish a 90% confidence level upper limit on the branch for this decay mode to be 7.4×10-6%. The implications of this result for the 144Pm cosmic-ray chronometer problem are discussed.

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