Spectroscopic study of $^{47}$Ca from the $\beta^-$ decay of $^{47}$K

J. K. Smith; A. B. Garnsworthy; J. L. Pore; C. Andreoiu; A. D. MacLean; A. Chester; Z. Beadle; G. C. Ball; P. C. Bender; V. Bildstein; R. Braid; A. Diaz Varela; R. Dunlop; L. J. Evitts; P. E. Garrett; G. Hackman; S. V. Ilyushkin; B. Jigmeddorj; K. Kuhn; A. T. Laffoley; K. G. Leach; D. Miller; W. J. Mills; W. Moore; M. Moukaddam; B. Olaizola; E. E. Peters; A. J. Radich; E. T. Rand; F. Sarazin; C. E. Svensson; S. J. Williams; S. W. Yates

doi:10.1103/physrevc.102.054314

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arXiv · 2010.15878

Spectroscopic study of $^{47}$Ca from the $\beta^-$ decay of $^{47}$K

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Abstract

The $\beta^-$ decay of $^{47}$K to $^{47}$Ca is an appropriate mechanism for benchmarking interactions spanning the $sd$ and $pf$ shells, but current knowledge of the $\beta^-$-decay scheme is limited. We have performed a high-resolution, high-efficiency study of the $\beta^-$-decay of $^{47}$K with the GRIFFIN spectrometer at TRIUMF-ISAC. The study revealed 48 new transitions, a more precise value for the $^{47}$K half-life (17.38(3)~s), and new spin and parity assignments for eight excited states. Levels placed for the first time here raise the highest state observed in $\beta^-$ decay to within 568(3) keV of the $Q$-value and confirm the previously measured large $\beta^-$-decay branching ratios to the low-lying states. Previously unobserved $\beta^-$-feeding to 3/2$^+$ states between 4.5 and 6.1~MeV excitation energy was identified with a total $\beta^-$-feeding intensity of 1.29(2)\%. The sum of the $B(GT)$ values for these states indicates that the $1s_{1/2}$ proton hole strength near this excitation energy is comparable to the previously known $1s_{1/2}$ proton and neutron hole strengths near 2.6 MeV.

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J. K. Smith, A. B. Garnsworthy, J. L. Pore, C. Andreoiu, A. D. MacLean, A. Chester, Z. Beadle, G. C. Ball, P. C. Bender, V. Bildstein, R. Braid, A. Diaz Varela, R. Dunlop, L. J. Evitts, P. E. Garrett, G. Hackman, S. V. Ilyushkin, B. Jigmeddorj, K. Kuhn, A. T. Laffoley, K. G. Leach, D. Miller, W. J. Mills, W. Moore, M. Moukaddam, B. Olaizola, E. E. Peters, A. J. Radich, E. T. Rand, F. Sarazin, C. E. Svensson, S. J. Williams, S. W. Yates. 2020-10-29. Spectroscopic study of $^{47}$Ca from the $\beta^-$ decay of $^{47}$K. https://doi.org/10.1103/physrevc.102.054314

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