Anomalous behavior of the 2(+) mixed-symmetry state in Zr-94

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

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16 Citations (Scopus)

Abstract

The low-spin structure of 94Zr 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 94Zr. 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
Volume75
Issue number1
DOIs
Publication statusPublished - 20 Aug 2013
Externally publishedYes

Keywords

  • BRANCHING RATIO
  • E2-TRANSITIONS
  • GROUND STATES
  • KEV RANGE
  • M1-TRANSITIONS
  • MASS NUMBER
  • SPIN
  • SYMMETRY
  • VIBRATIONAL STATES
  • ZIRCONIUM 94
  • ANGULAR MOMENTUM
  • DIMENSIONLESS NUMBERS
  • ENERGY LEVELS
  • ENERGY RANGE
  • ENERGY-LEVEL TRANSITIONS
  • EVEN-EVEN NUCLEI
  • EXCITED STATES
  • INTERMEDIATE MASS NUCLEI
  • ISOTOPES
  • MULTIPOLE TRANSITIONS
  • NUCLEI
  • PARTICLE PROPERTIES
  • STABLE ISOTOPES
  • ZIRCONIUM ISOTOPES

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