The MONUMENT Experiment: Ordinary Muon Capture studies for 0νββ decay
arxiv(2024)
摘要
The MONUMENT experiment measures ordinary muon capture (OMC) on isotopes
relevant for neutrinoless double-beta (0νββ) decay and nuclear
astrophysics. OMC is a particularly attractive tool for improving the
theoretical description of 0νββ decay. It involves similar momentum
transfers and allows testing the virtual transitions involved in
0νββ decay against experimental data. During the 2021 campaign,
MONUMENT measured OMC on ^76Se and ^136Ba, the isotopes relevant for
next-generation 0νββ decay searches, like LEGEND and nEXO. The
experimental setup has been designed to accurately extract the total and
partial muon capture rates, which requires precise reconstruction of energies
and time-dependent intensities of the OMC-related γ rays. The setup also
includes a veto counter system to allow selecting a clean sample of OMC events.
This work provides a detailed description of the MONUMENT setup operated during
the 2021 campaign, its two DAQ systems, calibration and analysis approaches,
and summarises the achieved detector performance. Future improvements are also
discussed.
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