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Title: Experimental identification of the T = 1 , J π = 6 + state of Co 54 and isospin symmetry in A = 54 studied via one-nucleon knockout reactions

Abstract

In this paper, new experimental data obtained from γ-ray tagged one-neutron and one-proton knockout from 55Co are presented. A candidate for the sought-after T = 1, Tz = 0, Jπ = 6+ state in 54Co is proposed based on a comparison to the new data on 54Fe, the corresponding observables predicted by large-scale-shell-model (LSSM) calculations in the full fp-model space employing charge-dependent contributions, and isospin-symmetry arguments. Furthermore, possible isospin-symmetry breaking in the A = 54, T = 1 triplet is studied by calculating the experimental c coefficients of the isobaric mass multiplet equation (IMME) up to the maximum possible spin J = 6 expected for the (1f7/2)-2 two-hole configuration relative to the doubly magic nucleus 56Ni. Lastly, the experimental quantities are compared to the theoretically predicted c coefficients from LSSM calculations using two-body matrix elements obtained from a realistic chiral effective field theory potential at next-to-next-to-next-to-leading order (N3LO).

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [1];  [2];  [1];  [1];  [1];  [1];  [3];  [1];  [1];  [4]
  1. Michigan State Univ., East Lansing, MI (United States)
  2. Univ. of York (United Kingdom)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Univ. of Surrey, Guildford (United Kingdom)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1580255
Alternate Identifier(s):
OSTI ID: 1737593
Report Number(s):
BNL-212450-2019-JAAM
Journal ID: ISSN 2469-9985; PRVCAN
Grant/Contract Number:  
SC0012704; NA0003180; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 100; 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; Direct reactions; energy levels & level densities; nuclear reactions; nuclear structure & decays; nucleon-nucleon interactions; shell model; unstable nuclei induced nuclear reactions

Citation Formats

Spieker, Mark, Weisshaar, D., Gade, A., Brown, B. A., Adrich, P., Bazin, D., Bentley, M. A., Brown, J. R., Campbell, C. M., Diget, C. Aa., Elman, B., Glasmacher, T., Hill, M., Longfellow, B., Pritychenko, Boris, Ratkiewicz, A., Rhodes, D., and Tostevin, J. A. Experimental identification of the T=1 , Jπ=6+ state of Co54 and isospin symmetry in A=54 studied via one-nucleon knockout reactions. United States: N. p., 2019. Web. doi:10.1103/PhysRevC.100.061303.
Spieker, Mark, Weisshaar, D., Gade, A., Brown, B. A., Adrich, P., Bazin, D., Bentley, M. A., Brown, J. R., Campbell, C. M., Diget, C. Aa., Elman, B., Glasmacher, T., Hill, M., Longfellow, B., Pritychenko, Boris, Ratkiewicz, A., Rhodes, D., & Tostevin, J. A. Experimental identification of the T=1 , Jπ=6+ state of Co54 and isospin symmetry in A=54 studied via one-nucleon knockout reactions. United States. doi:https://doi.org/10.1103/PhysRevC.100.061303
Spieker, Mark, Weisshaar, D., Gade, A., Brown, B. A., Adrich, P., Bazin, D., Bentley, M. A., Brown, J. R., Campbell, C. M., Diget, C. Aa., Elman, B., Glasmacher, T., Hill, M., Longfellow, B., Pritychenko, Boris, Ratkiewicz, A., Rhodes, D., and Tostevin, J. A. Wed . "Experimental identification of the T=1 , Jπ=6+ state of Co54 and isospin symmetry in A=54 studied via one-nucleon knockout reactions". United States. doi:https://doi.org/10.1103/PhysRevC.100.061303. https://www.osti.gov/servlets/purl/1580255.
@article{osti_1580255,
title = {Experimental identification of the T=1 , Jπ=6+ state of Co54 and isospin symmetry in A=54 studied via one-nucleon knockout reactions},
author = {Spieker, Mark and Weisshaar, D. and Gade, A. and Brown, B. A. and Adrich, P. and Bazin, D. and Bentley, M. A. and Brown, J. R. and Campbell, C. M. and Diget, C. Aa. and Elman, B. and Glasmacher, T. and Hill, M. and Longfellow, B. and Pritychenko, Boris and Ratkiewicz, A. and Rhodes, D. and Tostevin, J. A.},
abstractNote = {In this paper, new experimental data obtained from γ-ray tagged one-neutron and one-proton knockout from 55Co are presented. A candidate for the sought-after T = 1, Tz = 0, Jπ = 6+ state in 54Co is proposed based on a comparison to the new data on 54Fe, the corresponding observables predicted by large-scale-shell-model (LSSM) calculations in the full fp-model space employing charge-dependent contributions, and isospin-symmetry arguments. Furthermore, possible isospin-symmetry breaking in the A = 54, T = 1 triplet is studied by calculating the experimental c coefficients of the isobaric mass multiplet equation (IMME) up to the maximum possible spin J = 6 expected for the (1f7/2)-2 two-hole configuration relative to the doubly magic nucleus 56Ni. Lastly, the experimental quantities are compared to the theoretically predicted c coefficients from LSSM calculations using two-body matrix elements obtained from a realistic chiral effective field theory potential at next-to-next-to-next-to-leading order (N3LO).},
doi = {10.1103/PhysRevC.100.061303},
journal = {Physical Review C},
number = 6,
volume = 100,
place = {United States},
year = {2019},
month = {12}
}

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