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Title: Revalidation of the isobaric multiplet mass equation for the A=20 quintet

An unexpected breakdown of the isobaric multiplet mass equation in the A = 20, T = 2 quintet was recently reported, presenting a challenge to modern theories of nuclear structure. In the present work, the excitation energy of the lowest T = 2 state in Na-20 has been measured to be 6498.4 +/- 0.2stat ± 0.4syst keV by using the superallowed 0+ → 0+ beta decay of Mg-20 to access it and an array of high-purity germanium detectors to detect its gamma-ray deexcitation. This value differs by 27 keV (1.9 standard deviations) from the recommended value of 6525 ± 14 keV and is a factor of 28 more precise. The isobaric multiplet mass equation is shown to be revalidated when the new value is adopted.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [3] ;  [3] ;  [1] ;  [2] ;  [2] ;  [1] ;  [2] ;  [1] ;  [4] ;  [1] ;  [5] ;  [6] ;  [3] more »;  [1] « less
  1. Michigan State Univ., East Lansing, MI (United States)
  2. Univ. of Notre Dame, IN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Texas A & M Univ., College Station, TX (United States)
  6. Univ. of Surrey, Guildford (United Kingdom)
Publication Date:
OSTI Identifier:
1261473
Grant/Contract Number:
AC05-00OR22725; PHY-1102511; PHY-1419765; PHY-1404442
Type:
Accepted Manuscript
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 4; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS