SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 11: Neutrinos, Dark Matter I

T 11.3: Vortrag

Montag, 20. März 2023, 17:00–17:15, POT/0051

Status of the MONUMENT Experiment; ordinary muon capture as a benchmark for 0νββ decay nuclear structure calculations — •Elizabeth Mondragon for the MONUMENT collaboration — Technical University of Munich, 85748 Garching, Germany

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-radiation following the OMC process makes this a promising tool to validate NME calculations and test the quenching of the axial vector coupling g_A. 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. The experiment carried out at the Paul Scherrer Institute and the first results from the beam-time in 2021 will be presented.

This research is supported by the DFG Grant: 448829699 and RFBR-DFG with project number: 21-52-12040.