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Experimental identification of the T=1 , Jπ=6+ state of Co54 and isospin symmetry in A=54 studied via one-nucleon knockout reactions

Journal Article · · Physical Review C
 [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)
+ Show Author Affiliations
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).
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC02-05CH11231; NA0003180; SC0012704
OSTI ID:
1580255
Alternate ID(s):
OSTI ID: 1737593
Report Number(s):
BNL--212450-2019-JAAM
Journal Information:
Physical Review C, Journal Name: Physical Review C Journal Issue: 6 Vol. 100; ISSN PRVCAN; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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