$0\nu\beta\beta$ into the normal ordering with Theia
Nuclear-structure effects play an important role in the decay rate of very rare processes. These effects are summarized in the nuclear matrix elements which holds information about the initial and final states and are dependent on the weak axial-vector coupling. One commonly overlooked suppression, quenching of the weak axial-vector coupling, can significantly increase calculated 0νββ...
Double beta plus decay is a rare nuclear disintegration process. Difficulties in its measurement arise from suppressed decay probabilities, experimentally challenging decay signatures and low natural abundances of suitable candidate nuclei. Studying these decays can offer valuable insights into nuclear structure and fundamental symmetries. The decay rate is influenced by nuclear matrix...
The LEGEND collaboration aims to unambiguously discover neutrinoless double-beta decay (0νββ) using high-purity germanium (HPGe) detectors enriched in the double-beta-decaying isotope $^{76}$Ge (Q$_{ββ}$ = 2039 keV). The HPGe detectors operate in liquid argon, which serves as a coolant and an active shield, enabling a quasi background-free search for 0νββ decay. The first phase, LEGEND-200,...
The scientific priority of searching for neutrinoless double beta decay with sensitivity to the Normal Hierarchy is well known. In this talk I will point out how a liquid xenon detector might be designed to reach the required sensitivity by implementing a number of techniques to control the backgrounds. The concept would allow almost all of the xenon to be fiducial, leading to a modular...
