# 17th International Conference on Topics in Astroparticle and Underground Physics (TAUP 2021)

26 August 2021 to 3 September 2021

## Detection prospects for the double-beta decays of $^{124}$Xe

30 Aug 2021, 18:00
1h 30m
Poster Neutrino physics and astrophysics

### Speaker

Christian Wittweg (University of Zürich)

### Description

The isotope $^{124}$Xe is exceedingly rare and long-lived. Still, its two-neutrino and neutrinoless double-weak decays offer exciting opportunities for neutrino and nuclear physics. The double-weak decays with neutrinos provide constraints for nuclear matrix element calculations on the proton-rich side of the nuclear chart [C. Wittweg, B. Lenardo, A. Fieguth and C. Weinheimer, EPJ C 80 (2020) 1161]. What makes $^{124}$Xe special is the theoretical possibility of three different neutrinoless decay modes – either via double-electron capture in a nuclear resonance, or involving the emission of one or two positrons. These decays could be a key to understanding the mass and nature of the neutrino as well as the dominance of matter over antimatter in the Universe. Together with the observation of neutrinoless double-beta decays in other isotopes, $^{124}$Xe could allow to disentangle the underlying decay mechanism. The poster will introduce the neutrinoless and two-neutrino decays of $^{124}$Xe and discuss the detection prospects with upcoming experiments such as LZ, XENONnT, nEXO and DARWIN.

Reference to paper (DOI or arXiv) 10.1140/epjc/s10052-020-08726-w

### Primary author

Christian Wittweg (University of Zürich)

### Co-authors

Dr. Brian Lenardo (Stanford University) Dr. Alexander Fieguth (Stanford University) Prof. Christian Weinheimer (Institute of Nuclear Physics, WWU Münster) Christian Wittweg (Universität Zürich)

### Presentation Materials

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