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

Spieker, M., 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, B., Ratkiewicz, A., Rhodes, D. and Tostevin, J.A. (2019) Experimental identification of the T = 1, Jπ = 6+ state of 54Co and isospin symmetry in A = 54 studied via one-nucleon knockout reactions Physical Review C, 100 (6), 061303(R).

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New experimental data obtained from γ-ray tagged one-neutron and one-proton knockout from 55Co is presented. A candidate for the sought-after T = 1, T z = 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. 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).

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Spieker, M.
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, B.
Ratkiewicz, A.
Rhodes, D.
Date : 11 December 2019
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1103/PhysRevC.100.061303
Copyright Disclaimer : © 2019 American Physical Society
Related URLs :
Additional Information : This work was supported by the National Science Foundation under Grant No. PHY-1565546 (NSCL) and PHY-1811855, the DOE National Nuclear Security Ad- ministration through the Nuclear Science and Security Consortium under Award No. DE-NA0003180 as well as by the UK Science and Technology Facilities Coun- cil (STFC) through Research Grant No. ST/F005314/1, ST/P003885/1 and GR/T18486/01.
Depositing User : Diane Maxfield
Date Deposited : 21 Nov 2019 15:18
Last Modified : 21 Jan 2020 14:14

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