High-precision branching ratio measurement and spin assignment implications for Ga 62 superallowed β 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; C. J. Griffin; G. F. Grinyer; G. Hackman; J. Henderson; 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; J. K. Smith; R. Sultana; J. Turko; J. Williams; D. Yates; T. Zidar

doi:10.1103/PhysRevC.102.054325

High-precision branching ratio measurement and spin assignment implications for Ga 62 superallowed β 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. FinlayS. Gillespie, A. B. Garnsworthy, P. E. Garrett, E. Gopaul, C. J. Griffin, G. F. Grinyer, G. Hackman, J. Henderson, 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, J. K. Smith, R. Sultana, J. Turko, J. Williams, D. Yates, T. Zidar

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Abstract

A high-precision branching ratio measurement for the superallowed Fermi β+ emitter Ga62 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 Ga62β+ decay, to be placed in the level scheme of the daughter nucleus Zn62, establishing the superallowed β branching ratio for Ga62 decay to be 99.8577-0.0029+0.0023%, 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 Zn62 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 Ga62 superallowed Fermi β decay.

Original language	English (US)
Article number	054325
Journal	Physical Review C
Volume	102
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.102.054325
State	Published - Nov 19 2020
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.102.054325

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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 β decay. Physical Review C, 102(5), [054325]. https://doi.org/10.1103/PhysRevC.102.054325

@article{c58ae242dcb7426a918db9d64349579d,

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

abstract = "A high-precision branching ratio measurement for the superallowed Fermi β+ emitter Ga62 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 Ga62β+ decay, to be placed in the level scheme of the daughter nucleus Zn62, establishing the superallowed β branching ratio for Ga62 decay to be 99.8577-0.0029+0.0023%, 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 Zn62 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 Ga62 superallowed Fermi β decay.",

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 Bhattacharjee, {S. S.} 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 Griffin, {C. J.} and Grinyer, {G. F.} and G. Hackman and J. Henderson 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 Smith, {J. K.} and R. Sultana and J. Turko and J. Williams and D. Yates and T. Zidar",

note = "Funding Information: We thank the operations and beam delivery staff at TRIUMF for providing the high-quality radioactive beam, and I. S. Towner for providing the shell-model calculations of decay and the subsequent decay in the daughter nucleus . This work was supported by the Natural Sciences and Engineering Research Council of Canada and the U.S. DOE Office of Science, under Grant No. DE-SC0017649. The GRIFFIN infrastructure was funded jointly by the Canada Foundation for Innovation, the Ontario Ministry of Research and Innovation, the British Columbia Knowledge Development Fund, TRIUMF, and the University of Guelph. TRIUMF receives funding through a contribution agreement with the National Research Council Canada. C.E.S. acknowledges support from the Canada Research Chairs program. Publisher Copyright: {\textcopyright} 2020 American Physical Society.",

year = "2020",

month = nov,

day = "19",

doi = "10.1103/PhysRevC.102.054325",

language = "English (US)",

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, Griffin, CJ, Grinyer, GF, Hackman, G, Henderson, J, 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, Smith, JK, Sultana, R, Turko, J, Williams, J, Yates, D & Zidar, T 2020, 'High-precision branching ratio measurement and spin assignment implications for Ga 62 superallowed β 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 β 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 - Griffin, C. J.

AU - Grinyer, G. F.

AU - Hackman, G.

AU - Henderson, J.

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 - Smith, J. K.

AU - Sultana, R.

AU - Turko, J.

AU - Williams, J.

AU - Yates, D.

AU - Zidar, T.

N1 - Funding Information: We thank the operations and beam delivery staff at TRIUMF for providing the high-quality radioactive beam, and I. S. Towner for providing the shell-model calculations of decay and the subsequent decay in the daughter nucleus . This work was supported by the Natural Sciences and Engineering Research Council of Canada and the U.S. DOE Office of Science, under Grant No. DE-SC0017649. The GRIFFIN infrastructure was funded jointly by the Canada Foundation for Innovation, the Ontario Ministry of Research and Innovation, the British Columbia Knowledge Development Fund, TRIUMF, and the University of Guelph. TRIUMF receives funding through a contribution agreement with the National Research Council Canada. C.E.S. acknowledges support from the Canada Research Chairs program. Publisher Copyright: © 2020 American Physical Society.

PY - 2020/11/19

Y1 - 2020/11/19

N2 - A high-precision branching ratio measurement for the superallowed Fermi β+ emitter Ga62 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 Ga62β+ decay, to be placed in the level scheme of the daughter nucleus Zn62, establishing the superallowed β branching ratio for Ga62 decay to be 99.8577-0.0029+0.0023%, 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 Zn62 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 Ga62 superallowed Fermi β decay.

AB - A high-precision branching ratio measurement for the superallowed Fermi β+ emitter Ga62 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 Ga62β+ decay, to be placed in the level scheme of the daughter nucleus Zn62, establishing the superallowed β branching ratio for Ga62 decay to be 99.8577-0.0029+0.0023%, 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 Zn62 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 Ga62 superallowed Fermi β decay.

UR - http://www.scopus.com/inward/record.url?scp=85097159582&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85097159582&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.102.054325

DO - 10.1103/PhysRevC.102.054325

M3 - Article

AN - SCOPUS:85097159582

VL - 102

JO - Physical Review C

JF - Physical Review C

SN - 2469-9985

IS - 5

M1 - 054325

ER -

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

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