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.
Published Web Location
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.95.064317Abstract
© 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.