Nuclear Gamma Radiation Caused by a Muon at Rest in 152 Sm

Investigation of the interaction of muons with complex nuclei yields important results on the properties of nuclei and on their electromagnetic interaction with muons happening to be in the Coulomb field of the nucleus. The muon serves as a unique instrument in studies of the charge distribution and of other properties of nuclei. The following are processes which yield information relevant to the properties of nuclei. This work is the first (and unique) investigation of the dynamic E0 excitation of nucleus at µ– decay on the K-orbit of muonic atom. This excitation mechanism permits one to get per se nuclear monopole excitation. Study of nuclear excitation by the bound muon is of independent interest— the discovery of a new process and validation of ideas about it in the future can provide a new complementary method for studying nuclear monopole states. Information on the phenomenon investigated in the present work is of interest from the point of view of analysis of neutrinoless µ → ẹ conversion in Mu2e and COMET experiments.