The N=47 Shell-model Nucleus 90Tc

Research output: Contribution to journalArticle


Lifetimes of high spin states in the nucleus Tc-90 have been measured via the fusion evaporation reactions Ni-58(Ar-36, 3pn)Tc-90 at 140 MeV and Ni-58(Cl-35, 2pn)Tc-90 at 120 MeV beam energy. The OSIRIS spectrometer as well as a new neutron-gamma-coincidence setup were used to measure lifetimes in the 10(-12) - 10(-9) s range by the recoil distance Doppler-shift method. By means of gamma-multiplicity and neutron-gated spectra fifteen lifetimes were deduced. The experimental branching ratios and transition probabilities are compared to predictions of shell model calculations in a restricted pi(p(1/2)), pi(g(9/2)), nu(p(1/2)), and nu(g(9/2)) configuration space. In most cases the agreement with the calculations using the Gross-Frenkel parameters is striking but the results for several yrare states very sensitively depend on the residual interaction used.


  • Dirk Rudolph
  • A. Harder
  • M. K. Kabadiyski
  • K. P. Lieb
  • R. Schubart
  • M. Weiszflog
  • J. Altmann
  • F. Becker
  • P. von Brentano
  • T. Burkhard
  • A. Dewald
  • J. Eberth
  • U. Hermkens
  • T. Mylaeus
  • H. Grawe
  • J. Heese
  • K. H. Maier
External organisations
  • External Organization - Unknown
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Pages (from-to)105-113
JournalZeitschrift für Physik A Hadrons and Nuclei
Issue number2
Publication statusPublished - 1994
Publication categoryResearch

Bibliographic note