Anomalous behavior of the 2+ mixed-symmetry state in Zr94

E. Elhami, J. N. Orce, S. Mukhopadhyay, S. N. Choudry, M. Scheck, M. T. McEllistrem, S. W. Yates

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30 Scopus citations

Abstract

The low-spin structure of Zr94 has been studied with the (n,n'γ) reaction, and branching ratios, lifetimes, multipolarities and spin assignments were determined. The 22+ state at 1671.4 keV has been identified as the lowest mixed-symmetry state in Zr94. The 752.5-keV transition from this state to the 21+ level has a large B(M1) value of 0.33(5) μN2, and the B(E2) of the transition to the ground state has an unusually large value of 8(1) W.u. The M1 transition strength is in agreement with IBM-2 predictions in the U(5) vibrational limit, whereas the large B(E2;21,MS+→01+) value significantly exceeds the E2 strength predicted by the IBM-2. For the first time, the 21,MS+→01+E2 transition is observed to have a larger E2 transition strength than the 21+→01+ decay.

Original languageEnglish
Article number011301
JournalPhysical Review C - Nuclear Physics
Volume75
Issue number1
DOIs
StatePublished - 2007

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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