The ${\beta }^{-}$ decay of ${}^{47}\mathrm{K}$ to ${}^{47}\mathrm{Ca}$ 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 ${}^{47}\mathrm{K}$ with the GRIFFIN spectrometer at TRIUMF-ISAC. The study revealed 48 new transitions, a more precise value for the ${}^{47}\mathrm{K}$ half-life [17.38(3) s], and new spin and parity assignments for 8 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 $B\left(GT\right)$ 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.

• Received 1 July 2020
• Accepted 27 October 2020

DOI:https://doi.org/10.1103/PhysRevC.102.054314