Decay spectroscopy of $^{50}$Sc and $^{50m}$Sc to $^{50}$Ti

Abstract

The β decay of the isomeric and ground state of 50 Sc to the semi-magic nucleus 50 22 Ti28 has been studied using a 50 Ca beam delivered to the GRIFFIN γ-ray spectrometer at the TRIUMF-ISAC facility. β-decay branching ratios are reported to 16 excited states with a total of 38 γ-ray transitions linking them. These new data significantly expands the information available over previous studies. Relative intensities are measured to less than 0.001% that of the strongest transition with the majority of γ-ray transitions observed here in β decay for the first time. The data are compared to shell-model calculations utilizing both phenomenologically-derived interactions employed in the pf shell as well as a state-of-the-art, ab initio based interaction built in the valence-space in-medium similarity renormalization group framework.