The β
− decay of 47K to 47Ca is an appropriate mechanism for benchmarking interactions spanning
the sd and pf shells, but current knowledge of the β
−-decay scheme is limited. We have performed
a high-resolution, high-efficiency study of the β
−-decay of 47K with the GRIFFIN spectrometer at
TRIUMF-ISAC. The study revealed 48 new transitions, a more precise value for the 47K 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 β
− decay to within 568(3) keV of the Q-value and
confirm the previously measured large β
−-decay branching ratios to the low-lying states. Previously
unobserved β
−-feeding to 3/2+ states between 4.5 and 6.1 MeV excitation energy was identified with
a total β
−-feeding intensity of 1.29(2)%. The sum of the B(GT) values for these states indicates that
the 1s1/2 proton hole strength near this excitation energy is comparable to the previously known
1s1/2 proton and neutron hole strengths near 2.6 MeV