1. The Monument experiment: ordinary muon capture studies for $$0\nu \beta \beta $$ 0 ν β β decay
- Author
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G. R. Araujo, D. Bajpai, L. Baudis, V. Belov, E. Bossio, T. E. Cocolios, H. Ejiri, M. Fomina, K. Gusev, I. H. Hashim, M. Heines, S. Kazartsev, A. Knecht, E. Mondragón, Z. W. Ng, I. Ostrovskiy, F. Othman, N. Rumyantseva, S. Schönert, M. Schwarz, E. Shevchik, M. Shirchenko, Yu Shitov, E. O. Sushenok, J. Suhonen, S. M. Vogiatzi, C. Wiesinger, I. Zhitnikov, and D. Zinatulina
- Subjects
Astrophysics ,QB460-466 ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract The Monument experiment measures ordinary muon capture (OMC) on isotopes relevant for neutrinoless double-beta ( $$0\nu \beta \beta $$ 0 ν β β ) decay and nuclear astrophysics. OMC is a particularly attractive tool for improving the theoretical description of $$0\nu \beta \beta $$ 0 ν β β decay. It involves similar momentum transfers and allows testing the virtual transitions involved in $$0\nu \beta \beta $$ 0 ν β β decay against experimental data. During the 2021 campaign, Monument studied OMC on $$^{76}$$ 76 Se and $$^{136}$$ 136 Ba, the isotopes relevant for next-generation $$0\nu \beta \beta $$ 0 ν β β 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 $$\gamma $$ 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.
- Published
- 2024
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