Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Astroparticle Physics II

HK 44.2: Group Report

Wednesday, March 30, 2022, 14:30–15:00, HK-H10

The MONUMENT Experiment; ordinary muon capture as a benchmark for 0νββ decay nuclear structure calculations — Elisabetta Bossio¹, •Elizabeth Mondragon¹, Stefan Schönert¹, Mario Schwarz¹, and Christoph Wiesinger^1,2 for the MONUMENT collaboration — ¹Lehrstuhl für Experimentalphysik E15, Technische Universität München, Garching — ²Max-Planck Institut für Physik, München

Extracting particle physics properties from neutrinoless double-beta (0νββ) decay requires a detailed understanding of the involved nuclear structures. Still, modern calculations of the corresponding nuclear matrix elements (NMEs) differ by factors 2-3. The high momentum transfer of Ordinary Muon Capture (OMC) provides insight into highly excited states similar to those that contribute virtually to 0νββ transitions. The precise study of the γ’s following the OMC process makes this a promising tool to validate NME calculations. The MONUMENT collaboration is performing a series of explorative OMC measurements involving typical ββ decay daughter isotopes such as ⁷⁶Se and ¹³⁶Ba, as well as other benchmark isotopes. In this talk the experiment carried out at the Paul Scherrer Institute and first results from the beamtime in 2021 will be presented. This research is supported by the DFG Grant 448829699.