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

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.

doi:10.1103/PhysRevC.92.042501

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

Journal Article · Thu Oct 29 00:00:00 EDT 2015 · Physical Review C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.92.042501· OSTI ID:1261473

Glassman, B. E. ^[1]; Pérez-Loureiro, D. ^[1]; Wrede, C. ^[1]; Allen, J. ^[2]; Bardayan, D. W. ^[2]; Bennett, M. B. ^[1]; Brown, B. A. ^[1]; Chipps, K. A. ^[3]; Febbraro, M. ^[3]; Fry, C. ^[1]; Hall, M. R. ^[2]; Hall, O. ^[2]; Liddick, S. N. ^[1]; O'Malley, P. ^[2]; Ong, W. ^[1]; Pain, S. D. ^[4]; Schwartz, S. B. ^[1]; Shidling, P. ^[5]; Sims, H. ^[6]; Thompson, P. ^[3] more »

Michigan State Univ., East Lansing, MI (United States)
Univ. of Notre Dame, IN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Texas A & M Univ., College Station, TX (United States)
Univ. of Surrey, Guildford (United Kingdom)

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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; PHY-1102511; PHY-1419765; PHY-1404442

OSTI ID:: 1261473

Journal Information:: Physical Review C, Nuclear Physics, Vol. 92, Issue 4; ISSN 0556-2813

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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References (36)

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