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Beta-decay energies and masses of short-lived isotopes of rubidium, caesium, francium, and radium

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

Total decay energies have been measured for a number of neutron-deficient Rb and Cs isotopes, as well as for some neutron-rich isotopes of Fr and Ra. Mass separated sources were produced at the ISOLDE on-line separator at CERN. By applying two differentβ-γ coincidence methods,Q values or their lower limits were determined for76–78Rb,80Rb,121–124Cs,222Fr,224–226Fr,229Ra-229Ac. For many of these nuclei, the atomic mass excesses could be derived, allowing the comparison of masses of far unstable nuclei with predictions from mass formulae. The odd-odd nuclei76Rb and78Rb appear to be 1−1 1/2 MeV more strongly bound than expected from the systematics.

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Authors and Affiliations

  1. CERN, Geneva, Switzerland

    L. Westgaard

  2. Chalmers University of Technology, Gothenburg

    K. Aleklett & G. Nyman

  3. The Swedish Research Councils' Laboratory, Studsvik, Sweden

    K. Aleklett

  4. Gesellschaft für Schwerionenforschung mbH, Darmstadt, Germany

    G. Nyman & E. Roeckl

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  1. L. Westgaard
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  2. K. Aleklett
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  3. G. Nyman
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  4. E. Roeckl
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The authors acknowledge with pleasure enlightening discussions with J. Blomquist, P. G. Hansen, E. Lund, W. D. Myers, O. B. Nielsen and G. Rudstam. Without the continuous help of E. Kugler, S. Sundell and the skill of ISOLDE separator crew these experiments could not have been performed.

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Westgaard, L., Aleklett, K., Nyman, G. et al. Beta-decay energies and masses of short-lived isotopes of rubidium, caesium, francium, and radium. Z Physik A 275, 127–144 (1975). https://doi.org/10.1007/BF01409588

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  • DOI: https://doi.org/10.1007/BF01409588

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