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

B. E. Glassman; D. Pérez-Loureiro; C. Wrede; J. Allen; D. W. Bardayan; M. B. Bennett; B. A. Brown; K. A. Chipps; M. Febbraro; C. Fry; M. R. Hall; O. Hall; S. N. Liddick; P. O'Malley; W. Ong; S. D. Pain; S. B. Schwartz; P. Shidling; H. Sims; P. Thompson; H. Zhang

doi:10.1103/PhysRevC.92.042501

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

B. E. Glassman, D. Pérez-Loureiro, C. Wrede, J. Allen, D. W. Bardayan, M. B. Bennett, B. A. Brown, K. A. Chipps, M. Febbraro, C. Fry, M. R. Hall, O. Hall, S. N. Liddick, P. O'Malley, W. Ong, S. D. Pain, S. B. Schwartz, P. Shidling, H. Sims, P. ThompsonH. Zhang

Nuclear Structure and Nuclear Astrophysi

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16 Scopus citations

Abstract

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 Na20 has been measured to be 6498.4±0.2stat±0.4syst keV by using the superallowed 0+→0+ beta decay of Mg20 to access it and an array of high-purity germanium detectors to detect its γ-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.

Original language	English
Article number	042501
Journal	Physical Review C - Nuclear Physics
Volume	92
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.92.042501
State	Published - Oct 29 2015

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© 2015 American Physical Society.

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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., ... Zhang, H. (2015). Revalidation of the isobaric multiplet mass equation for the A=20 quintet. Physical Review C - Nuclear Physics, 92(4), Article 042501. https://doi.org/10.1103/PhysRevC.92.042501

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

abstract = "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 Na20 has been measured to be 6498.4±0.2stat±0.4syst keV by using the superallowed 0+→0+ beta decay of Mg20 to access it and an array of high-purity germanium detectors to detect its γ-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.",

author = "Glassman, {B. E.} and D. P{\'e}rez-Loureiro and C. Wrede and J. Allen and Bardayan, {D. W.} and Bennett, {M. B.} and Brown, {B. A.} and Chipps, {K. A.} and M. Febbraro and C. Fry and Hall, {M. R.} and O. Hall and Liddick, {S. N.} and P. O'Malley and W. Ong and Pain, {S. D.} and Schwartz, {S. B.} and P. Shidling and H. Sims and P. Thompson and H. Zhang",

note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",

year = "2015",

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language = "English",

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Glassman, BE, Pérez-Loureiro, D, Wrede, C, Allen, J, Bardayan, DW, Bennett, MB, Brown, BA, Chipps, KA, Febbraro, M, Fry, C, Hall, MR, Hall, O, Liddick, SN, O'Malley, P, Ong, W, Pain, SD, Schwartz, SB, Shidling, P, Sims, H, Thompson, P & Zhang, H 2015, 'Revalidation of the isobaric multiplet mass equation for the A=20 quintet', Physical Review C - Nuclear Physics, vol. 92, no. 4, 042501. https://doi.org/10.1103/PhysRevC.92.042501

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AU - Glassman, B. E.

AU - Pérez-Loureiro, D.

AU - Wrede, C.

AU - Allen, J.

AU - Bardayan, D. W.

AU - Bennett, M. B.

AU - Brown, B. A.

AU - Chipps, K. A.

AU - Febbraro, M.

AU - Fry, C.

AU - Hall, M. R.

AU - Hall, O.

AU - Liddick, S. N.

AU - O'Malley, P.

AU - Ong, W.

AU - Pain, S. D.

AU - Schwartz, S. B.

AU - Shidling, P.

AU - Sims, H.

AU - Thompson, P.

AU - Zhang, H.

PY - 2015/10/29

Y1 - 2015/10/29

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AB - 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 Na20 has been measured to be 6498.4±0.2stat±0.4syst keV by using the superallowed 0+→0+ beta decay of Mg20 to access it and an array of high-purity germanium detectors to detect its γ-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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Revalidation of the isobaric multiplet mass equation for the A=20 quintet

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