Search for Double Beta Plus Decays with NuDoubt++

TL;DR

NuDoubt++ is a novel detector concept combining hybrid and opaque scintillation technologies with new light read-out methods, aiming to detect rare double beta plus decay modes with significantly improved sensitivity.

Contribution

The paper introduces NuDoubt++, a new detector design that enhances detection of double beta plus decay by integrating innovative scintillation and light read-out techniques.

Findings

Potential to discover two-neutrino double beta plus decay within 1 tonne-week exposure.

Ability to probe neutrinoless double beta plus decays at significantly improved sensitivity.

First-time combination of hybrid and opaque scintillation technologies for this purpose.

Abstract

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. In this presentation, we propose NuDoubt++, a new detector concept to overcome these challenges. It is based on the first-time combination of hybrid and opaque scintillation detector technology paired with novel light read-out techniques. This approach is particularly suitable detecting positron (beta plus) signatures. We expect to discover two-neutrino double beta plus decay modes within 1 tonne-week exposure and are able to probe neutrinoless double beta plus decays at several orders of magnitude improved significance compared to current experimental limits.