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.
@article{arxiv.2010.15878,
title = {Spectroscopic study of $^{47}$Ca from the $\beta^-$ decay of $^{47}$K},
author = {J. K. Smith and A. B. Garnsworthy and J. L. Pore and C. Andreoiu and A. D. MacLean and A. Chester and Z. Beadle and G. C. Ball and P. C. Bender and V. Bildstein and R. Braid and A. Diaz Varela and R. Dunlop and L. J. Evitts and P. E. Garrett and G. Hackman and S. V. Ilyushkin and B. Jigmeddorj and K. Kuhn and A. T. Laffoley and K. G. Leach and D. Miller and W. J. Mills and W. Moore and M. Moukaddam and B. Olaizola and E. E. Peters and A. J. Radich and E. T. Rand and F. Sarazin and C. E. Svensson and S. J. Williams and S. W. Yates},
journal= {arXiv preprint arXiv:2010.15878},
year = {2020}
}