Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 22: Neutrino Physics II

T 22.2: Vortrag

Dienstag, 17. März 2026, 16:30–16:45, AudiMax

NuDoubt⁺⁺: Search for Double Beta Plus Decays — •Veronika Palusova for the NuDoubt collaboration — Johannes Gutenberg-Universität Mainz

Double beta plus decay modes (β⁺β⁺, β⁺EC, and 2EC) are rare second-order weak processes converting two protons into two neutrons. Their observation is difficult due to extremely low probabilities, com- plex signatures, and the low natural abundance of suitable isotopes. Studying these decays offers insights into nuclear structure and fundamental symmetries. Decay rates depend on nuclear matrix elements (NMEs) and phase space factors (PSFs), crucial for interpreting data and refining theoretical models. We introduce NuDoubt⁺⁺, a novel detector concept for double beta plus decay searches with unprecedented sensitivity. It integrates hybrid and opaque scintillation technologies with advanced light readout to enhance positron detection. Preliminary estimates show that a 1-tonne-week exposure could reach sensitivity to 2νβ⁺β⁺ and 2νβ⁺EC decays in ⁷⁸Kr. The design also improves background rejection and resolution, enabling exploration of 0νβ⁺β⁺ decay beyond current limits.

Keywords: Double beta decay; Neutrinoless double beta decay