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Multi-quasiparticle sub-nanosecond isomers in $^{178}$W

  • Rudigier, M.
  • Walker, P.M.
  • Canavan, R.L.
  • Podolyák, Zs.
  • Regan, P.H.
  • Söderström, P.-A.
  • Lebois, M.
  • Wilson, J.N.
  • Jovancevic, N.
  • Blazhev, A.
  • Benito, J.
  • Bottoni, S.
  • Brunet, M.
  • Cieplicka-Orynczak, N.
  • Courtin, S.
  • Doherty, D.T.
  • Fraile, L.M.
  • Hadynska-Klek, K.
  • Heine, M.
  • Iskra, Ł.W.
  • And 16 more
Publication Date
Feb 10, 2020
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We report on the first measurement of the half-lives of Kπ=11− and 12+ four-quasiparticle states in the even-even nucleus 178 W. The sub-nanosecond half-lives were measured by applying the centroid shift method to data taken with LaBr 3 (Ce) scintillator detectors of the NuBall array at the ALTO facility in Orsay, France. The half-lives of these states only became experimentally accessible by the combination of several experimental techniques - scintillator fast timing, isomer spectroscopy with a pulsed beam, and the event-by-event calorimetry information provided by the NuBall array. The measured half-lives are 476(44)ps and 275(65)ps for the Iπ=11− and 12+ states, respectively. The decay transitions include weakly hindered E 1 and E 2 branches directly to the ground-state band, bypassing the two-quasiparticle states. This is the first such observation for an E 1 transition. The interpretation of the small hindrance hinges on mixing between the ground-state band and the t-band.

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