# Study of the $\beta$-decay of $^{100}$Tc with Total Absorption $\gamma$-Ray Spectroscopy

## TL;DR

This study investigates the beta decay of 100 Tc using Total Absorption Gamma-Ray Spectroscopy, providing new insights into decay feeding levels and benchmarking QRPA theoretical models relevant for double beta decay research.

## Contribution

It introduces the use of the DTAS spectrometer with a plastic beta detector for detailed beta decay analysis of 100 Tc, revealing new decay feeding information and benchmarking QRPA calculations.

## Key findings

- Good agreement with previous measurements on ground state feeding
- Differences observed in feeding to the first excited state
- Identification of weak feeding to a high-energy level

## Abstract

The \b{eta}-decay of 100 Tc has been studied using the Total Absorption {\gamma}-Ray Spectroscopy technique at IGISOL. In this work the new DTAS spectrometer in coincidence with a cylindrical plastic \b{eta} detector has been employed. The \b{eta}-intensity to the ground state obtained from the analysis is in good agreement with previous high-resolution measurements. However, differences in the feeding to the first excited state as well as weak feeding to a new level at high excitation energy have been deduced from this experiment. Theoretical calculations performed in the quasiparticle random- phase approximation (QRPA) framework are also reported. Comparison of these calculations with our measurement serves as a benchmark for calculations of the double \b{eta}-decay of 100 Mo.