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Open Access Publications from the University of California

Isomeric Character of the Lowest Observed 4^{+} State in ^{44}S.

  • Author(s): Parker, JJ
  • Wiedenhöver, I
  • Cottle, PD
  • Baker, J
  • McPherson, D
  • Riley, MA
  • Santiago-Gonzalez, D
  • Volya, A
  • Bader, VM
  • Baugher, T
  • Bazin, D
  • Gade, A
  • Ginter, T
  • Iwasaki, H
  • Loelius, C
  • Morse, C
  • Recchia, F
  • Smalley, D
  • Stroberg, SR
  • Whitmore, K
  • Weisshaar, D
  • Lemasson, A
  • Crawford, HL
  • Macchiavelli, AO
  • Wimmer, K
  • et al.

Previous experiments observed a 4^{+} state in the N=28 nucleus ^{44}S and suggested that this state may exhibit a hindered E2-decay rate, inconsistent with being a member of the collective ground state band. We populate this state via two-proton knockout from a beam of exotic ^{46}Ar projectiles and measure its lifetime using the recoil distance method with the GRETINA γ-ray spectrometer. The result, 76(14)_{stat}(20)_{syst}  ps, implies a hindered transition of B(E2;4^{+}→2_{1}^{+})=0.61(19) single-particle or Weisskopf units strength and supports the interpretation of the 4^{+} state as a K=4 isomer, the first example of a high-K isomer in a nucleus of such low mass.

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