SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 69: Structure and Dynamics of Nuclei XIV

HK 69.2: Vortrag

Donnerstag, 23. März 2023, 16:00–16:15, SCH/A118

Simulation of ordinary muon capture for nuclear matrix elements of 0vββ research — •Xianke He, Andreas Jansen, and Kai Zuber — Institute of Nuclear and Particle Physics, TU Dresden, Germany

The search for beyond the Standard Model neutrinoless double beta decay (0vββ) is currently one method of determining the Majorana nature of the neutrino. The decay requires a non-zero neutrino mass. The connection between any possibly measured half-life and the neutrino mass is provided by the nuclear matrix elements (NMEs).

Nuclear models aiming at the description of the NMEs of 0vββ decays at high-momentum-exchange could be tested with Ordinary Muon Capture. OMC is a semi-leptonic weak interaction process quite like electron capture but with 200 times the electron rest mass. This leads to a remarkably larger momentum exchange. The OMC process taking place in the mother nuclei produces multipolarities J^π states of daughter nuclei with large angular momenta and high excitation energies.

From an experimental point of view, the corresponding muon capture rates can be obtained by measuring the intensity of gamma rays emitted during the de-excitation of these excited state nuclei over time, which can be used to test the correctness of the model describing the NMEs.

This talk will show the proposed experimental design to measure gamma spectrum of OMC using cosmic muons.