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Neutron-unbound excited states of N 23

  • Author(s): Jones, MD
  • Baumann, T
  • Brett, J
  • Bullaro, J
  • DeYoung, PA
  • Finck, JE
  • Frank, N
  • Hammerton, K
  • Hinnefeld, J
  • Kohley, Z
  • Kuchera, AN
  • Pereira, J
  • Rabeh, A
  • Smith, JK
  • Spyrou, A
  • Stephenson, SL
  • Stiefel, K
  • Tuttle-Timm, M
  • Zegers, RGT
  • Thoennessen, M
  • et al.
Abstract

Neutron unbound states in N23 were populated via proton knockout from an 83.4 MeV/nucleon O24 beam on a liquid deuterium target. The two-body decay energy displays two peaks at E1∼100keV and E2∼1MeV with respect to the neutron separation energy. The data are consistent with shell model calculations predicting resonances at excitation energies of ∼3.6MeV and ∼4.5MeV. The selectivity of the reaction implies that these states correspond to the first and second 3/2- states. The energy of the first state is about 1.3 MeV lower than the first excited 2+ in O24. This decrease is largely due to coupling with the πp3/2-1 hole along with a small reduction of the N=16 shell gap in N23.

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