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Competing particle–hole excitations in 30Na: Constraining state-of-the-art effective interactions

  • Author(s): Petri, M
  • Fallon, P
  • Macchiavelli, AO
  • Heil, S
  • Rodriguez-Vieitez, E
  • Bazin, D
  • Campbell, CM
  • Clark, RM
  • Cromaz, M
  • Gade, A
  • Glasmacher, T
  • Lee, IY
  • Malbrunot-Ettenauer, S
  • Paschalis, S
  • Ratkiewicz, A
  • Terry, JR
  • Weisshaar, D
  • Wiedeking, M
  • et al.
Abstract

© 2015 The Authors. The odd-odd nucleus 30Na is studied via a one-proton, one-proton-one-neutron and one-neutron removal reaction using an intermediate-energy 31Mg, 32Mg and 31Na radioactive ion beam, respectively. Combining high-resolution γ-ray spectroscopy with the selectivity of the three reaction mechanisms, we are able to distinguish multiple particle-hole configurations. Negative-parity states in 30Na are observed for the first time, providing an important measure of the excitation of the 1p1h/3p3h configuration and hence the sd-pf shell gap. The extracted band structures and level energies serve as invaluable input for the theoretical refinement of the effective interactions used in this region.

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