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Decay studies of N ≈ Z nuclei from 75Sr to 102Sn

  • T. Faestermann
  • R. Schneider
  • A. Stolz
  • K. Sümmerer
  • E. Wefers
  • J. Friese
  • H. Geissel
  • M. Hellström
  • P. Kienle
  • H.-J. Körner
  • M. Mineva
  • M. Münch
  • G. Münzenberg
  • C. Schlegel
  • K. Schmidt
  • P. Thirolf
  • H. Weick
  • K. Zeitelhack

Abstract:

Neutron deficient nuclei near 100Sn have been produced by fragmentation of a 1 . AGeV 112Sn beam. The fragments were separated, identified and stopped in a highly segmented silicon strip detector stack. This detector measured the total energy of emitted β+-particles. γ-radiation was measured with surrounding detectors. The half-lives for many nuclides have been determined for the first time and give important information for the following topics: For the heaviest particle-stable odd-odd nuclei 90Rh, 94Ag and 98In we observed for the first time fast β-decays, compatible with superallowed Fermi transitions and confirmed such decays for 78Y, 82Nb and 86Tc. We have also observed long-lived T = 0 states in some of these nuclei. We measured the half-lives of all rp-process waiting-point nuclei from 80Zr up to 92, 93Pd. In addition we find the proton drip line nucleus 77Y to decay dominantly via β-decay. To study the Gamov-Teller strength in the β-decay near the doubly magic 100Sn we measured the half-life, β- and γ-spectrum of 102Sn. We propose a level scheme for the daughter nuclide 102In and deduce the Gamov-Teller strength (BGT = 4.0±0.6). This is one of the largest values known.

PACS. 21.10.Tg Lifetimes – 23.40.Hc Relation with nuclear matrix elements and nuclear structure – 23.50.+z Decay by proton emission 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2002

Authors and Affiliations

  • T. Faestermann
    • 1
  • R. Schneider
    • 1
  • A. Stolz
    • 1
  • K. Sümmerer
    • 2
  • E. Wefers
    • 1
  • J. Friese
    • 1
  • H. Geissel
    • 2
  • M. Hellström
    • 2
  • P. Kienle
    • 1
  • H.-J. Körner
    • 1
  • M. Mineva
    • 3
  • M. Münch
    • 1
  • G. Münzenberg
    • 2
  • C. Schlegel
    • 2
  • K. Schmidt
    • 2
  • P. Thirolf
    • 4
  • H. Weick
    • 2
  • K. Zeitelhack
    • 1
  1. 1.Technische Universität München, 85748 Garching, GermanyDE
  2. 2.Gesellschaft für Schwerionenforschung mbH, 64291 Darmstadt, GermanyDE
  3. 3.Lund University, 22100 Lund, SwedenSE
  4. 4.Ludwig-Maximilians-Universität München, 85748 Garching, GermanyDE

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