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Is the Structure of ^{42}Si Understood?

  • Author(s): Gade, A
  • Brown, BA
  • Tostevin, JA
  • Bazin, D
  • Bender, PC
  • Campbell, CM
  • Crawford, HL
  • Elman, B
  • Kemper, KW
  • Longfellow, B
  • Lunderberg, E
  • Rhodes, D
  • Weisshaar, D
  • et al.
Abstract

A more detailed test of the implementation of nuclear forces that drive shell evolution in the pivotal nucleus ^{42}Si-going beyond earlier comparisons of excited-state energies-is important. The two leading shell-model effective interactions, SDPF-MU and SDPF-U-Si, both of which reproduce the low-lying ^{42}Si(2_{1}^{+}) energy, but whose predictions for other observables differ significantly, are interrogated by the population of states in neutron-rich ^{42}Si with a one-proton removal reaction from ^{43}P projectiles at 81  MeV/nucleon. The measured cross sections to the individual ^{42}Si final states are compared to calculations that combine eikonal reaction dynamics with these shell-model nuclear structure overlaps. The differences in the two shell-model descriptions are examined and linked to predicted low-lying excited 0^{+} states and shape coexistence. Based on the present data, which are in better agreement with the SDPF-MU calculations, the state observed at 2150(13) keV in ^{42}Si is proposed to be the (0_{2}^{+}) level.

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