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Open Access Publications from the University of California

Unexpected distribution of ν1f7/2 strength in Ca49

  • Author(s): Crawford, HL
  • Macchiavelli, AO
  • Fallon, P
  • Albers, M
  • Bader, VM
  • Bazin, D
  • Campbell, CM
  • Clark, RM
  • Cromaz, M
  • Dilling, J
  • Gade, A
  • Gallant, A
  • Holt, JD
  • Janssens, RVF
  • Krücken, R
  • Langer, C
  • Lauritsen, T
  • Lee, IY
  • Menéndez, J
  • Noji, S
  • Paschalis, S
  • Recchia, F
  • Rissanen, J
  • Schwenk, A
  • Scott, M
  • Simonis, J
  • Stroberg, SR
  • Tostevin, JA
  • Walz, C
  • Weisshaar, D
  • Wiens, A
  • Wimmer, K
  • Zhu, S
  • et al.

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© 2017 American Physical Society. The calcium isotopes have emerged as a critical testing ground for new microscopically derived shell-model interactions, and a great deal of experimental and theoretical focus has been directed toward this region. We investigate the relative spectroscopic strengths associated with 1f7/2 neutron hole states in Ca47,49 following one-neutron knockout reactions from Ca48,50. The observed reduction of strength populating the 7/21- state in Ca49, as compared to Ca47, is inconsistent with shell-model calculations using both phenomenological interactions such as GXPF1, and interactions derived from microscopically based two- and three-nucleon forces. The result suggests a fragmentation of the l=3 strength to higher-lying states as suggested by the microscopic calculations, but the observed magnitude of the reduction is not reproduced in any shell-model description.

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