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The new neutron-rich nuclei231Fr and231Ra

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

The new neutron-rich isotope231Fr has been produced in a spallation reaction of238U induced by 600 MeV protons and identified by mass-separation and decay spectroscopy. In addition, the so far unknown231Ra and the known231Ac have been observed as daughter products. The Z-assignments were performed via the decay of KX-rays, and genetic relationships. Half-lives of 17.5(8) s and 103(3) s were obtained for231Fr and231Ra, respectively.

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Authors and Affiliations

  1. Institut für Kernchemie, Universität Mainz, D-6500, Mainz, Federal Republic of Germany

    P. Hill & N. Kaffrell

  2. Institute of Experimental Physics, University of Warsaw, PL-00-681, Warsaw, Poland

    W. Kurcewicz

  3. Department of Physics, Chalmers University of Technology, S-41296, Göteborg, Sweden

    G. Nyman

Authors
  1. P. Hill
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  2. N. Kaffrell
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  3. W. Kurcewicz
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  4. G. Nyman
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Additional information

The generous support of E. Ruchowska, D. Schardt and the ISOLDE Collaboration during the experriments is appreciated.

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Hill, P., Kaffrell, N., Kurcewicz, W. et al. The new neutron-rich nuclei231Fr and231Ra. Z Physik A 320, 531–532 (1985). https://doi.org/10.1007/BF01415732

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  • DOI: https://doi.org/10.1007/BF01415732

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