The β- decay of K47 to Ca47 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 K47 with the GRIFFIN spectrometer at TRIUMF-ISAC. The study revealed 48 new transitions, a more precise value for the K47 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 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.
ASJC Scopus subject areas
- Nuclear and High Energy Physics