Abstract
We report on high-statistics data from the beta(-) decay of the K-46 J pi = 2(-) ground state taken with the GRIFFIN spectrometer located at the TRIUMF-ISAC facility. In total, 199 gamma rays and 42 excited states were placed in the level scheme, and from the observed beta feeding and angular correlations of pairs of cascading gamma rays, it was possible to assign spins and parities to excited states and determine mixing ratios for selected gamma rays. The level structure of Ca-46 is compared to theoretical predictions from a microscopic valence-space Hamiltonian derived from two- and three-nucleon forces. These calculations are in reasonable agreement with the experimental data and indicate that the protons in this region are not as inert as would be expected for semimagic nuclei.