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Physical Review Letters 93 (2004) 072502
Direct Mass Measurements on the Superallowed Emitter $^{74}$Rb and its Daughter $^{74}$Kr
A. G. Kellerbauer, G. Audi1, D. Beck, K. Blaum, G. Bollen, B. A. Brown, P. Delahaye, C. Guénaut1, F. Herfurth, H. J. Kluge, D. Lunney1, S. Schwarz, L. Schweikhard, C. Yazidjian

The decay energy of the superallowed ? decay 74Rb(?+)74Kr was determined by direct Penning trap mass measurements on both the mother and the daughter nuclide using the time-of-flight resonance technique and found to be Q = 10416.8(4.5) keV. The exotic nuclide 74Rb, with a half-life of only 65 ms, is the shortest-lived nuclide on which a high-precision mass measurement in a Penning trap has been carried out. Together with existing data for the partial half-life as well as theoretical corrections, the decay energy yields a comparative half-life of Ft = 3084(15) s for this decay, in agreement with the mean value for the series of the lighter nuclides from 10C to 54Co. Assuming conserved vector current, this result allows for an experimental determination of the isospin-symmetry-breaking correction ?C.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Physique/Physique Nucléaire Expérimentale
beta-decay – nuclei with mass number 59 to 89 – nuclear mass – radioactive decay periods – nuclear isospin – spontaneous symmetry breaking – standard model
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