Unexpected distribution of ν1f7/2 strength in Ca49

Crawford, H. L.; Macchiavelli, A. O.; Fallon, P.; Albers, M.; Bader, V. M.; Bazin, D.; Campbell, C. M.; Clark, R. M.; Cromaz, M.; Dilling, J.; Gade, A.; Gallant, A.; Holt, J. D.; Janssens, R. V. F.; Krücken, R.; Langer, C.; Lauritsen, T.; Lee, I. Y.; Menéndez, J.; Noji, S.; Paschalis, S.; Recchia, F.; Rissanen, J.; Schwenk, A.; Scott, M.; Simonis, J.; Stroberg, S. R.; Tostevin, J. A.; Walz, C.; Weisshaar, D.; Wiens, A.; Wimmer, K.; Zhu, S.

doi:10.1103/PhysRevC.95.064317

Title: Unexpected distribution of $ν 1 f_{7 / 2}$ strength in ${}^{49}{Ca}$

Journal Article · Wed Jun 21 00:00:00 EDT 2017 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.95.064317· OSTI ID:1366427

Crawford, H. L. ^[1]; Macchiavelli, A. O. ^[2]; Fallon, P. ^[2]; Albers, M. ^[3]; Bader, V. M. ^[4]; Bazin, D. ^[4]; Campbell, C. M. ^[2]; Clark, R. M. ^[2]; Cromaz, M. ^[2]; Dilling, J. ^[5]; Gade, A. ^[4]; Gallant, A. ^[5]; Holt, J. D. ^[6]; Janssens, R. V. F. ^[3]; Krücken, R. ^[5]; Langer, C. ^[4]; Lauritsen, T. ^[3]; Lee, I. Y. ^[2]; Menéndez, J. ^[7]; Noji, S. ^[4] more »

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Ohio Univ., Athens, OH (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Michigan State Univ., East Lansing, MI (United States)
TRIUMF, Vancouver, BC (Canada); Univ. of British Columbia, Vancouver, BC (Canada)
TRIUMF, Vancouver, BC (Canada)
The Univ. of Tokyo, Tokyo (Japan)
Technische Univ. Darmstadt, Darmstadt (Germany); Univ. of York, York (United Kingdom)
Technische Univ. Darmstadt, Darmstadt (Germany); GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt (Germany)
Michigan State Univ., East Lansing, MI (United States); TRIUMF, Vancouver, BC (Canada)
Univ. of Surrey, Surrey (United Kingdom)
Technische Univ. Darmstadt, Darmstadt (Germany)
Central Michigan Univ., Mount Pleasant, MI (United States); The Univ. of Tokyo, Tokyo (Japan)

The calcium isotopes have emerged as an important testing ground for new microscopically derived shell-model interactions, and a great deal of focus has been directed toward this region. We investigate the relative spectroscopic strengths associated with $$1f_{7/2}$$ neutron hole states in $$^{47, 49}$$Ca following one-neutron knockout reactions from $$^{48,50}$$Ca. The observed reduction of strength populating the lowest 7/2$$^{-}_{1}$$ state in $$^{49}$$Ca, as compared to $$^{47}$$Ca, is consistent with the description given by shell-model calculations based on two- and three-nucleon forces in the neutron $pf$ model space, implying a fragmentation of the $$l$$=3 strength to higher-lying states. The experimental result is inconsistent with both the GXPF1 interaction routinely used in this region of the nuclear chart and with microscopic calculations in an extended model space including the $$\nu1g_{9/2}$$ orbital.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-06CH11357; AC02-05CH11231; FG02-88ER40387; NA0000979

OSTI ID:: 1366427

Alternate ID(s):: OSTI ID: 1365438; OSTI ID: 1398468; OSTI ID: 1400273

Journal Information:: Physical Review C, Vol. 95, Issue 6; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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