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

## TL;DR

This study investigates the beta decay of $^{50}$Sc to $^{50}$Ti using gamma-ray spectroscopy, revealing new decay pathways and providing detailed data that enhance understanding of nuclear structure near semi-magic nuclei.

## Contribution

It provides the first detailed gamma-ray decay scheme for $^{50}$Sc to $^{50}$Ti, including new transitions and branching ratios, and compares results with advanced shell-model calculations.

## Key findings

- Discovered 16 excited states linked by 38 gamma-ray transitions.
- Measured gamma-ray intensities down to 0.001% of the strongest transition.
- Data agree with shell-model calculations, validating theoretical models.

## Abstract

The $\beta$ decay of the isomeric and ground state of $^{50}$Sc to the semi-magic nucleus $^{50}_{22}$Ti$_{28}$ has been studied using a $^{50}$Ca beam delivered to the GRIFFIN $\gamma$-ray spectrometer at the TRIUMF-ISAC facility. $\beta$-decay branching ratios are reported to 16 excited states with a total of 38 $\gamma$-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 $\gamma$-ray transitions observed here in $\beta$ decay for the first time. The data are compared to shell-model calculations utilizing both phenomenologically-derived interactions employed in the ${\it pf}$ shell as well as a state-of-the-art, ${\it ab~initio}$ based interaction built in the valence-space in-medium similarity renormalization group framework.