Speaker
Description
We describe the MONUMENT project (Muon Ordinary capture for NUclear Matrix elemENTs calculations) aims to determine ordinary muon capture (OMC) rates, which could help in studying nuclear responses for antineutrinos associated with double beta decays (ββ) and astroneutrino interactions.
The MONUMENT project has conducted a series of meticulous measurements at the PSI muon facility in Switzerland. Utilizing high-precision gamma-spectroscopy with negative slow muons and HPGe detectors, measurements were carried out on solid and are planned to be carried out on gaseous targets. The carefully controlled parameters of the muon beam especialy the beam momentum have enabled measurements on isotopically enriched targets with small masses, enhancing the precision of the study.
OMC presents a valuable supplementary tool for ββ decay matrix element calculations, effectively representing a virtual stage of this decay process. Additionally, the substantial transferred momentum (up to 100 MeV) can excite high-lying level states in intermediate nuclei. This unique feature opens avenues for investigating the details of nuclear structure of the isotopes involved in the ββ decay.
The MONUMENT project's ongoing efforts involve the continuation of these investigations through future experiments. Furthermore, the developed methods will be applied to explore the suppression of Gamow-Teller transitions in nuclei (G_a suppression).
