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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 +/- 0.2 stat ± 0.4 syst 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:
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 Lab. (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
OSTI Identifier:
1261473

Glassman, B. E., Pérez-Loureiro, D., Wrede, C., Allen, J., Bardayan, D. W., Bennett, M. B., Brown, B. A., Chipps, K. A., Febbraro, M., Fry, C., Hall, M. R., Hall, O., Liddick, S. N., O'Malley, P., Ong, W., Pain, S. D., Schwartz, S. B., Shidling, P., Sims, H., Thompson, P., and Zhang, H.. Revalidation of the isobaric multiplet mass equation for the A=20 quintet. United States: N. p., Web. doi:10.1103/PhysRevC.92.042501.
Glassman, B. E., Pérez-Loureiro, D., Wrede, C., Allen, J., Bardayan, D. W., Bennett, M. B., Brown, B. A., Chipps, K. A., Febbraro, M., Fry, C., Hall, M. R., Hall, O., Liddick, S. N., O'Malley, P., Ong, W., Pain, S. D., Schwartz, S. B., Shidling, P., Sims, H., Thompson, P., & Zhang, H.. Revalidation of the isobaric multiplet mass equation for the A=20 quintet. United States. doi:10.1103/PhysRevC.92.042501.
Glassman, B. E., Pérez-Loureiro, D., Wrede, C., Allen, J., Bardayan, D. W., Bennett, M. B., Brown, B. A., Chipps, K. A., Febbraro, M., Fry, C., Hall, M. R., Hall, O., Liddick, S. N., O'Malley, P., Ong, W., Pain, S. D., Schwartz, S. B., Shidling, P., Sims, H., Thompson, P., and Zhang, H.. 2015. "Revalidation of the isobaric multiplet mass equation for the A=20 quintet". United States. doi:10.1103/PhysRevC.92.042501. https://www.osti.gov/servlets/purl/1261473.
@article{osti_1261473,
title = {Revalidation of the isobaric multiplet mass equation for the A=20 quintet},
author = {Glassman, B. E. and Pérez-Loureiro, D. and Wrede, C. and Allen, J. and Bardayan, D. W. and Bennett, M. B. and Brown, B. A. and Chipps, K. A. and Febbraro, M. and Fry, C. and Hall, M. R. and Hall, O. and Liddick, S. N. and O'Malley, P. and Ong, W. and Pain, S. D. and Schwartz, S. B. and Shidling, P. and Sims, H. and Thompson, P. and Zhang, H.},
abstractNote = {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.},
doi = {10.1103/PhysRevC.92.042501},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 92,
place = {United States},
year = {2015},
month = {10}
}