A New isomeric State in $^{116}$Ag

ORAL

Abstract

We have discovered a new isomer in $^{116}$Ag with a half-life of 20(1) seconds, through the use of conversion electron, beta and gamma spectroscopy of on-line mass separated radioactivities at the Holifield Radioactive Ion Beam Facility at ORNL. The observed electron peaks at 22.5, 44.42, and 47.33 keV were interpreted as the K, L, and M conversion electron lines resulting from a 47.9 keV E3 transition associated with the decay of a second isomeric level in $^{116}$Ag. A new level structure of $^{116}$Ag is proposed, with the levels identified as the 0$^-$ ground-state and isomeric levels at 47.9 and 128.8 keV assigned spin/parities of 3$^+$ and 6$^-$ respectively. Nilsson configurations proposed for these isomeric levels correspond to an oblate deformation of $^{116}$Ag.

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Authors

  • J.C. Batchelder

  • H.K. Carter

  • E.H. Spejewski

    • UNIRIB/Oak Ridge Associated Universities

  • A. Piechaczek

  • E.F. Zganjar

    • Louisiana State University

  • J.C. Bilheux

  • K.P. Rykaczewski

  • D.W. Stracener

    • Oak Ridge National Laboratory

  • W.D. Kulp

  • J.L. Wood

    • Georgia Institute of Technology

  • C.R. Bingham

  • R. Grzywacz

  • Y. Larochelle

  • M.N. Tantawy

    • University of Tennessee

  • D.J. Hartley

    • U.S. Naval Academy

  • J.A. Winger

    • Mississippi State University

  • D.J. Fong

  • J.H. Hamilton

  • J.K. Hwang

  • W. Krolas

  • A.V. Ramayya

    • Vanderbilt University

  • P.E. Garrett

    • Lawrence Livermore National Laboratory