Observation of a New High-spin Isomer in 94Pd

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A second gamma-decaying high-spin isomeric state, with a half-life of 197(22) ns, has been identified in the N = Z + 2 nuclide Pd-94 as part of a stopped-beam Rare Isotope Spectroscopic INvestigation at GSI (RISING) experiment. Weisskopf estimates were used to establish a tentative spin/parity of 19(-), corresponding to the maximum possible spin of a negative parity state in the restricted (p(1/2), g(9/2)) model space of empirical shell model calculations. The reproduction of the E3 decay properties of the isomer required an extension of the model space to include the f (5/2) and p(3/2) orbitals using the CD-Bonn potential. This is the first time that such an extension has been required for a high-spin isomer in the vicinity of Sn-100 and reveals the importance of such orbits for understanding the decay properties of high-spin isomers in this region. However, despite the need for the extended model space for the E3 decay, the dominant configuration for the 19(-) state remains (p p(1/2)(-1)g(9/2)(-3))(11)circle times(nu g(9/2)(-2))(8). The half-life of the known, 14(+), isomer was remeasured and yielded a value of 499(13) ns.


  • T. S. Brock
  • B. S. Nara Singh
  • P. Boutachkov
  • N. Braun
  • A. Blazhev
  • Z. Liu
  • R. Wadsworth
  • M. Gorska
  • H. Grawe
  • S. Pietri
  • C. Domingo-Pardo
  • S. J. Steer
  • A. Atac
  • L. Bettermann
  • L. Caceres
  • T. Engert
  • K. Eppinger
  • T. Faestermann
  • F. Farinon
  • F. Finke
  • K. Geibel
  • J. Gerl
  • R. Gernhaeuser
  • N. Goel
  • A. Gottardo
  • J. Grebosz
  • C. Hinke
  • Robert Hoischen
  • G. Ilie
  • H. Iwasaki
  • J. Jolie
  • A. Kaskas
  • I. Kojuharov
  • R. Kruecken
  • N. Kurz
  • E. Merchan
  • C. Nociforo
  • J. Nyberg
  • M. Pfuetzner
  • A. Prochazka
  • Zs Podolyak
  • P. H. Regan
  • P. Reiter
  • S. Rinta-Antila
  • H. Schaffner
  • C. Scholl
  • P. -A. Soderstrom
  • N. Warr
  • H. Weick
  • H. -J. Wollersheim
  • P. J. Woods
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Article number061309(R)
JournalPhysical Review C (Nuclear Physics)
Issue number6
Publication statusPublished - 2010
Publication categoryResearch