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Title: Unexpected distribution of ν 1 f 7 / 2 strength in Ca 49

Abstract

Here, 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 1f 7/2 neutron hole states in 47,49Ca following one-neutron knockout reactions from 48,50Ca. The observed reduction of strength populating the 7/2 1 state in 49Ca, as compared to 47Ca, 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.

Authors:
 [1];  [2];  [2];  [3];  [4];  [4];  [2];  [2];  [2];  [5];  [4];  [5];  [6];  [3];  [5];  [4];  [3];  [2];  [7];  [4] more »;  [8];  [4];  [2];  [9];  [4];  [9];  [10];  [11];  [12];  [4];  [2];  [13];  [3] « less
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Ohio Univ., Athens, OH (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Michigan State Univ., East Lansing, MI (United States)
  5. TRIUMF, Vancouver, BC (Canada); Univ. of British Columbia, Vancouver, BC (Canada)
  6. TRIUMF, Vancouver, BC (Canada)
  7. The Univ. of Tokyo, Tokyo (Japan)
  8. Technische Univ. Darmstadt, Darmstadt (Germany); Univ. of York, York (United Kingdom)
  9. Technische Univ. Darmstadt, Darmstadt (Germany); GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt (Germany)
  10. Michigan State Univ., East Lansing, MI (United States); TRIUMF, Vancouver, BC (Canada)
  11. Univ. of Surrey, Surrey (United Kingdom)
  12. Technische Univ. Darmstadt, Darmstadt (Germany)
  13. Central Michigan Univ., Mount Pleasant, MI (United States); The Univ. of Tokyo, Tokyo (Japan)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1366427
Grant/Contract Number:
AC02-06CH11357; AC02-05CH11231; FG02-88ER40387; NA0000979
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 95; Journal Issue: 6; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

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., and Zhu, S.. Unexpected distribution of ν1f7/2 strength in Ca49. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.95.064317.
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.. Unexpected distribution of ν1f7/2 strength in Ca49. United States. doi:10.1103/PhysRevC.95.064317.
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., and Zhu, S.. 2017. "Unexpected distribution of ν1f7/2 strength in Ca49". United States. doi:10.1103/PhysRevC.95.064317.
@article{osti_1366427,
title = {Unexpected distribution of ν1f7/2 strength in Ca49},
author = {Crawford, H. L. and Macchiavelli, A. O. and Fallon, P. and Albers, M. and Bader, V. M. and Bazin, D. and Campbell, C. M. and Clark, R. M. and Cromaz, M. and Dilling, J. and Gade, A. and Gallant, A. and Holt, J. D. and Janssens, R. V. F. and Krücken, R. and Langer, C. and Lauritsen, T. and Lee, I. Y. and Menéndez, J. and Noji, S. and Paschalis, S. and Recchia, F. and Rissanen, J. and Schwenk, A. and Scott, M. and Simonis, J. and Stroberg, S. R. and Tostevin, J. A. and Walz, C. and Weisshaar, D. and Wiens, A. and Wimmer, K. and Zhu, S.},
abstractNote = {Here, 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 47,49Ca following one-neutron knockout reactions from 48,50Ca. The observed reduction of strength populating the 7/2–1 state in 49Ca, as compared to 47Ca, 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.},
doi = {10.1103/PhysRevC.95.064317},
journal = {Physical Review C},
number = 6,
volume = 95,
place = {United States},
year = 2017,
month = 6
}

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  • 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 withmore » $$1f_{7/2}$$ 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.« less
  • 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 1f7/2 neutron hole states in 47,49Ca following one-neutron knockout reactions from 48,50Ca. The observed reduction of strength populating the lowest 7/2- 1 state in 49Ca, as compared to 47Ca, 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 ismore » 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 ν1g9/2 orbital.« less
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