High-precision branching ratio measurement and spin assignment implications for Ga-62 superallowed beta decay

A. D. MacLean; A. T. Laffoley; C. E. Svensson; G. C. Ball; J. R. Leslie; C. Andreoiu; A. Babu; S.S. Bhattacharjee; H. Bidaman; V. Bildstein; C. Burbadge; M. Bowry; C. Cheng; D. S. Cross; A. Diaz-Varela; I. Dillmann; M. R. Dunlop; R. Dunlop; L. J. Evitts; P. Finlay; S. Gillespie; A. B. Garnsworthy; P. E. Garrett; E. Gopaul; G. F. Grinyer; G. Hackman; B. Jigmeddorj; K. G. Leach; E. Kassanda; J. McAfee; M. Moukaddam; C. Natzke; S. Nittala; B. Olaizola; J. Park; C. Paxman; J. L. Pore; C. Porzio; A. J. Radich; P. Ruotsalainen; Y. Saito; S. Sharma; J. Smallcombe; R. Sultana; J. Turko; D. Yates; T. Zidar

doi:10.1103/PhysRevC.102.054325

High-precision branching ratio measurement and spin assignment implications for Ga-62 superallowed beta decay

A. D. MacLean
, A. T. Laffoley
, C. E. Svensson
, G. C. Ball
, J. R. Leslie
, C. Andreoiu
, A. Babu
, S.S. Bhattacharjee
, H. Bidaman
, V. Bildstein
, C. Burbadge
, M. Bowry
, C. Cheng
, D. S. Cross
, A. Diaz-Varela
, I. Dillmann
, M. R. Dunlop
, R. Dunlop
, L. J. Evitts
, P. Finlay

S. Gillespie, A. B. Garnsworthy, P. E. Garrett, E. Gopaul, G. F. Grinyer, G. Hackman, B. Jigmeddorj, K. G. Leach, E. Kassanda, J. McAfee, M. Moukaddam, C. Natzke, S. Nittala, B. Olaizola, J. Park, C. Paxman, J. L. Pore, C. Porzio, A. J. Radich, P. Ruotsalainen, Y. Saito, S. Sharma, J. Smallcombe, R. Sultana, J. Turko, D. Yates, T. Zidar

School of Computer Science & Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

A high-precision branching ratio measurement for the superallowed Fermi β
+ emitter 62Ga was
performed with the Gamma-Ray Infrastructure for Fundamental Investigations of Nuclei (GRIFFIN)
spectrometer at the Isotope Separator and Accelerator (ISAC) radioactive ion beam facility at
TRIUMF. The high efficiency of the GRIFFIN spectrometer allowed 63 γ-ray transitions, with
intensities down to ≈1 part per million (ppm) per 62Ga β
+ decay, to be placed in the level scheme
of the daughter nucleus 62Zn, establishing the superallowed β branching ratio for 62Ga decay to be
99.8577+0.0023
−0.0029%, a factor of 4 more precise than the previous world average. For several cascades,
γ−γ angular correlation measurements were performed to assign spins and/or determine the mixing
ratios of transitions. In particular, the spin of the 2.342 MeV excited state in the daughter nucleus
62Zn was definitively assigned as J = 0. This assignment resolves a discrepancy between previous
measurements and has important implications for the isospin symmetry breaking correction, δC1,
in 62Ga superallowed Fermi β decay.
Keywords: 62Ga, β decay, branching ratios, γ − γ angular correlations, HPGe, isospin symmetry breaking

Original language	English
Article number	054325
Journal	Physical Review C
Volume	102
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.102.054325
Publication status	Published - 19 Nov 2020

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MacLean, A. D., Laffoley, A. T., Svensson, C. E., Ball, G. C., Leslie, J. R., Andreoiu, C., Babu, A., Bhattacharjee, S. S., Bidaman, H., Bildstein, V., Burbadge, C., Bowry, M., Cheng, C., Cross, D. S., Diaz-Varela, A., Dillmann, I., Dunlop, M. R., Dunlop, R., Evitts, L. J., ... Zidar, T. (2020). High-precision branching ratio measurement and spin assignment implications for Ga-62 superallowed beta decay. Physical Review C, 102(5), Article 054325. https://doi.org/10.1103/PhysRevC.102.054325

@article{6f0dfb08e8bf4b82844b3588adb8c142,

title = "High-precision branching ratio measurement and spin assignment implications for Ga-62 superallowed beta decay",

abstract = "A high-precision branching ratio measurement for the superallowed Fermi β + emitter 62Ga was performed with the Gamma-Ray Infrastructure for Fundamental Investigations of Nuclei (GRIFFIN) spectrometer at the Isotope Separator and Accelerator (ISAC) radioactive ion beam facility at TRIUMF. The high efficiency of the GRIFFIN spectrometer allowed 63 γ-ray transitions, with intensities down to ≈1 part per million (ppm) per 62Ga β + decay, to be placed in the level scheme of the daughter nucleus 62Zn, establishing the superallowed β branching ratio for 62Ga decay to be 99.8577+0.0023 −0.0029\%, a factor of 4 more precise than the previous world average. For several cascades, γ−γ angular correlation measurements were performed to assign spins and/or determine the mixing ratios of transitions. In particular, the spin of the 2.342 MeV excited state in the daughter nucleus 62Zn was definitively assigned as J = 0. This assignment resolves a discrepancy between previous measurements and has important implications for the isospin symmetry breaking correction, δC1, in 62Ga superallowed Fermi β decay. Keywords: 62Ga, β decay, branching ratios, γ − γ angular correlations, HPGe, isospin symmetry breaking",

author = "MacLean, \{A. D.\} and Laffoley, \{A. T.\} and Svensson, \{C. E.\} and Ball, \{G. C.\} and Leslie, \{J. R.\} and C. Andreoiu and A. Babu and S.S. Bhattacharjee and H. Bidaman and V. Bildstein and C. Burbadge and M. Bowry and C. Cheng and Cross, \{D. S.\} and A. Diaz-Varela and I. Dillmann and Dunlop, \{M. R.\} and R. Dunlop and Evitts, \{L. J.\} and P. Finlay and S. Gillespie and Garnsworthy, \{A. B.\} and Garrett, \{P. E.\} and E. Gopaul and Grinyer, \{G. F.\} and G. Hackman and B. Jigmeddorj and Leach, \{K. G.\} and E. Kassanda and J. McAfee and M. Moukaddam and C. Natzke and S. Nittala and B. Olaizola and J. Park and C. Paxman and Pore, \{J. L.\} and C. Porzio and Radich, \{A. J.\} and P. Ruotsalainen and Y. Saito and S. Sharma and J. Smallcombe and R. Sultana and J. Turko and D. Yates and T. Zidar",

year = "2020",

month = nov,

day = "19",

doi = "10.1103/PhysRevC.102.054325",

language = "English",

volume = "102",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "5",

}

MacLean, AD, Laffoley, AT, Svensson, CE, Ball, GC, Leslie, JR, Andreoiu, C, Babu, A, Bhattacharjee, SS, Bidaman, H, Bildstein, V, Burbadge, C, Bowry, M, Cheng, C, Cross, DS, Diaz-Varela, A, Dillmann, I, Dunlop, MR, Dunlop, R, Evitts, LJ, Finlay, P, Gillespie, S, Garnsworthy, AB, Garrett, PE, Gopaul, E, Grinyer, GF, Hackman, G, Jigmeddorj, B, Leach, KG, Kassanda, E, McAfee, J, Moukaddam, M, Natzke, C, Nittala, S, Olaizola, B, Park, J, Paxman, C, Pore, JL, Porzio, C, Radich, AJ, Ruotsalainen, P, Saito, Y, Sharma, S, Smallcombe, J, Sultana, R, Turko, J, Yates, D & Zidar, T 2020, 'High-precision branching ratio measurement and spin assignment implications for Ga-62 superallowed beta decay', Physical Review C, vol. 102, no. 5, 054325. https://doi.org/10.1103/PhysRevC.102.054325

TY - JOUR

T1 - High-precision branching ratio measurement and spin assignment implications for Ga-62 superallowed beta decay

AU - MacLean, A. D.

AU - Laffoley, A. T.

AU - Svensson, C. E.

AU - Ball, G. C.

AU - Leslie, J. R.

AU - Andreoiu, C.

AU - Babu, A.

AU - Bhattacharjee, S.S.

AU - Bidaman, H.

AU - Bildstein, V.

AU - Burbadge, C.

AU - Bowry, M.

AU - Cheng, C.

AU - Cross, D. S.

AU - Diaz-Varela, A.

AU - Dillmann, I.

AU - Dunlop, M. R.

AU - Dunlop, R.

AU - Evitts, L. J.

AU - Finlay, P.

AU - Gillespie, S.

AU - Garnsworthy, A. B.

AU - Garrett, P. E.

AU - Gopaul, E.

AU - Grinyer, G. F.

AU - Hackman, G.

AU - Jigmeddorj, B.

AU - Leach, K. G.

AU - Kassanda, E.

AU - McAfee, J.

AU - Moukaddam, M.

AU - Natzke, C.

AU - Nittala, S.

AU - Olaizola, B.

AU - Park, J.

AU - Paxman, C.

AU - Pore, J. L.

AU - Porzio, C.

AU - Radich, A. J.

AU - Ruotsalainen, P.

AU - Saito, Y.

AU - Sharma, S.

AU - Smallcombe, J.

AU - Sultana, R.

AU - Turko, J.

AU - Yates, D.

AU - Zidar, T.

PY - 2020/11/19

Y1 - 2020/11/19

N2 - A high-precision branching ratio measurement for the superallowed Fermi β + emitter 62Ga was performed with the Gamma-Ray Infrastructure for Fundamental Investigations of Nuclei (GRIFFIN) spectrometer at the Isotope Separator and Accelerator (ISAC) radioactive ion beam facility at TRIUMF. The high efficiency of the GRIFFIN spectrometer allowed 63 γ-ray transitions, with intensities down to ≈1 part per million (ppm) per 62Ga β + decay, to be placed in the level scheme of the daughter nucleus 62Zn, establishing the superallowed β branching ratio for 62Ga decay to be 99.8577+0.0023 −0.0029%, a factor of 4 more precise than the previous world average. For several cascades, γ−γ angular correlation measurements were performed to assign spins and/or determine the mixing ratios of transitions. In particular, the spin of the 2.342 MeV excited state in the daughter nucleus 62Zn was definitively assigned as J = 0. This assignment resolves a discrepancy between previous measurements and has important implications for the isospin symmetry breaking correction, δC1, in 62Ga superallowed Fermi β decay. Keywords: 62Ga, β decay, branching ratios, γ − γ angular correlations, HPGe, isospin symmetry breaking

AB - A high-precision branching ratio measurement for the superallowed Fermi β + emitter 62Ga was performed with the Gamma-Ray Infrastructure for Fundamental Investigations of Nuclei (GRIFFIN) spectrometer at the Isotope Separator and Accelerator (ISAC) radioactive ion beam facility at TRIUMF. The high efficiency of the GRIFFIN spectrometer allowed 63 γ-ray transitions, with intensities down to ≈1 part per million (ppm) per 62Ga β + decay, to be placed in the level scheme of the daughter nucleus 62Zn, establishing the superallowed β branching ratio for 62Ga decay to be 99.8577+0.0023 −0.0029%, a factor of 4 more precise than the previous world average. For several cascades, γ−γ angular correlation measurements were performed to assign spins and/or determine the mixing ratios of transitions. In particular, the spin of the 2.342 MeV excited state in the daughter nucleus 62Zn was definitively assigned as J = 0. This assignment resolves a discrepancy between previous measurements and has important implications for the isospin symmetry breaking correction, δC1, in 62Ga superallowed Fermi β decay. Keywords: 62Ga, β decay, branching ratios, γ − γ angular correlations, HPGe, isospin symmetry breaking

U2 - 10.1103/PhysRevC.102.054325

DO - 10.1103/PhysRevC.102.054325

M3 - Article

SN - 2469-9985

VL - 102

JO - Physical Review C

JF - Physical Review C

IS - 5

M1 - 054325

ER -

High-precision branching ratio measurement and spin assignment implications for Ga-62 superallowed beta decay

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