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T: Fachverband Teilchenphysik

T 87: Electroweak Interactions (Exp.) 2

T 87.8: Talk

Thursday, March 24, 2022, 18:05–18:20, T-H18

Upper limits on tri nucleon decays from GERDA — •Sean Sullivan for the GERDA collaboration — MPIK, Heidelberg, Germany

Tri-nucleon decay is a hypothetical process violating baryon number conservation allowed for in the standard model with an extension for light neutrino masses [1,2]. The GERDA search for neutrinoless double-beta decay employs HPGe detectors enriched in ⁷⁶Ge which could undergo tri-nucleon decay to unstable daughter nuclei. This work investigates the tri-nucleon decay chain of ⁷⁶Ge to ⁷³Ga and the subsequent beta decay and gamma cascade to the stable daughter ⁷³Ge. This allows setting limits on the tri-nucleon decay channels without the need to consider the exotic physics of the initial decay.

[1]S.I. Alvis et al. (Majorana Collaboration), 2019. Search for Tri-Nucleon Decay in the Majorana Demonstrator Phys. Rev. D 99, 072004

[2] Babu, K.S., Gogoladze, I. and Wang, K., 2003. Gauged baryon parity and nucleon stability. Physics Letters B, 570(1-2), pp.32-38.