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Physical Review C 76 (2007) 045504
High-precision masses of neutron-deficient rubidium isotopes using a Penning trap mass spectrometer
A. Kellerbauer, G. Audi1, D. Beck, K. Blaum, G. Bollen, C. Guénaut1, F. Herfurth, A. Herlert, H.-J. Kluge, D. Lunney1, S. Schwarz, L. Schweikhard, c. Weber, C. Yazidjian

The atomic masses of the neutron-deficient radioactive rubidium isotopes $^{74-77,79,80,83}$Rb have been measured with the Penning trap mass spectrometer ISOLTRAP. Using the time-of-flight cyclotron resonance technique, relative mass uncertainties ranging from 1.6×10$^{-8}$ to 5.6×10$^{-8}$ were achieved. In all cases, the mass precision was significantly improved as compared with the prior Atomic-Mass Evaluation; no significant deviations from the literature values were observed. The exotic nuclide $^{74}$Rb, 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. The significance of these measurements for a check of the conserved-vector-current hypothesis of the weak interaction and the unitarity of the Cabibbo-Kobayashi-Maskawa matrix is discussed.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Physique/Physique Nucléaire Expérimentale