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The $\beta^-$ decay of $^{47}$K to $^{47}$Ca is an appropriate mechanism forbenchmarking interactions spanning the $sd$ and $pf$ shells, but currentknowledge of the $\beta^-$-decay scheme is limited. We have performed ahigh-resolution, high-efficiency study of the $\beta^-$-decay of $^{47}$K withthe 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 andparity assignments for eight excited states. Levels placed for the first timehere raise the highest state observed in $\beta^-$ decay to within 568(3) keVof the $Q$-value and confirm the previously measured large $\beta^-$-decaybranching ratios to the low-lying states. Previously unobserved$\beta^-$-feeding to 3/2$^+$ states between 4.5 and 6.1~MeV excitation energywas identified with a total $\beta^-$-feeding intensity of 1.29(2)\%. The sumof the $B(GT)$ values for these states indicates that the $1s_{1/2}$ protonhole strength near this excitation energy is comparable to the previously known$1s_{1/2}$ proton and neutron hole strengths near 2.6 MeV.

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