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Penning trap mass measurements utilizing highly charged ions as a path to benchmark isospin-symmetry breaking corrections in Rb-74

  • Malbrunot-Ettenauer, S.
  • Brunner, T.
  • Chowdhury, U.
  • Gallant A., T.
  • Simon V., V.
  • Brodeur, M.
  • Chaudhuri, A.
  • Mane, E.
  • Simon M., C.
  • Andreoiu, C.
  • Audi, G.
  • Crespo Lopez-Urrutia J., R.
  • Delheij, P.
  • Gwinner, G.
  • Lapierre, A.
  • Lunney, D.
  • Pearson M., R.
  • Ringle, R.
  • Ullrich, J.
  • Dilling, J.
Publication Date
Apr 13, 2015
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Penning trap mass measurements of neutron-deficient Rb isotopes have been performed at TRIUMF's Ion Trap for Atomic and Nuclear Science (TITAN) facility by utilizing highly charged ions (HCIs). As imperative for a new approach with significant gain in measurement precision, experimental procedures, and systematic uncertainties are discussed in detail. Among the investigated nuclides, the superallowed nuclear beta emitter Rb-74 will especially benefit from the advantage offered by HCI because the limited attainable precision owing to its short half-life (T-1/2 = 65 ms) represents a challenge for conventional Penning trap mass spectrometry. Motivated by an updated Q(EC) value for Rb-74 of 10 416.8(3.9) keV and its large isospin-symmetry breaking corrections, we present a new test to benchmark the consistency between theoretical models of isospin-symmetry breaking corrections in superallowed decays, the conserved vector current hypothesis, and experimental data.

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