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

Research output: Contribution to journalArticle


Neutron deficient nuclei near Sn-100 have been produced by fragmentation of a 1 (.) A GeV Sn-112 beam. The fragments were separated, identified and stopped in a highly segmented silicon strip detector stack. This detector measured the total energy of emitted beta(+)-particles. gamma-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 Rh-90, Ag-94 and In-98 we observed for the first time fast beta-decays, compatible with superallowed Fermi transitions and confirmed such decays for 78y, 82 Nb and Tc. 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 _Zr up to addition we find the proton drip line nucleus Y-77 to decay dominantly via beta-decay, To study the Gamov-Teller strength in the beta-decay near the doubly magic Sn-102 we measured the half-life, beta- and gamma-spectrum of Sn-102. We propose a level scheme for the daughter nuclide In-102 and deduce the Qamov-Teller strength (B-GT = 4.0 +/- 0.6). This is one of the largest values known.


  • T Faestermann
  • R Schneider
  • A Stolz
  • K Summerer
  • E Wefers
  • J Friese
  • H Geissel
  • M Hellstrom
  • P Kienle
  • HJ Korner
  • Milena Mineva
  • M Munch
  • G Munzenberg
  • C Schlegel
  • K Schmidt
  • P Thirolf
  • H Weick
  • K Zeitelhack
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Pages (from-to)185-188
JournalEuropean Physical Journal A. Hadrons and Nuclei
Issue number1-2
Publication statusPublished - 2002
Publication categoryResearch