Göttingen 2025 – scientific programme

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T: Fachverband Teilchenphysik

T 16: Neutrino Physics I

T 16.3: Talk

Monday, March 31, 2025, 17:15–17:30, VG 3.103

Search for Neutrinoless Double Beta Plus Decays with NuDoubt⁺⁺ — •Cloé Girard-Carillo for the NuDoubt collaboration — Johannes Gutenberg-Universität Mainz

The discovery of neutrino oscillations revealed the possibility of neutrinos having masses, which could originate from Majorana particles and result in lepton number violation. One way to observe this violation is through neutrinoless double beta decay, where neutrinos are exchanged internally without appearing as external particles.

Most experiments so far have focused on double electron emission. However, advancements in new scintillator technologies, offering enhanced particle identification, now make it feasible to investigate double positron emission processes as well.

This presentation introduces the NuDoubt++ experiment, which uses a hybrid opaque scintillator with isotope loading to search for such a process. This combination makes it possible to separate signal from background using event topology and the ratio of Cherenkov to scintillation light. We will also explain how we plan to load ββ isotopes into the scintillator and describe a new proposal for collecting light more efficiently. We present the latest progress on the project, including recent developments in detector design and performance.

Keywords: Double Beta Decay; Scintillator; Particle ID; Isotope Loading; Positron