[en] Recently, a new focus for muonic atoms experiments has developed-- one which deals with the simplest muonic systems. In this paper, some novel precision experiments on the three-body muonic atoms and neutral muonic helium are described. These include a discus- sion of the properties and formation of muonic helium, and the measurement of the muonic helium hfs interval

No abstract available

No abstract available

[en] Separate abstracts are prepared for the three sections

[en] Properties of muon atoms of heavy elements are considered. Negative muon in heavy atom may induce fission via two ways

No abstract available

[en] A polarization shift of the levels and a corresponding polarization potential has been found for muonic atoms with Zapprox.10--50, for which the Coulomb energy of the muon is on the order of or greater than the characteristic excitation energy of the nucleus

[en] After a survey of the phenomenology of muonic hydrogen atoms and molecules recent experiments at SIN are discussed, dealing with muonic atoms and molecules in deuterium. These experiments could clarify the longstanding problem of hyperfine populations of muonic deuterium atoms. For the first time hyperfine transitions in muonic atoms and hyperfine effects in the resonant formation of muonic molecules have been observed. The implication of these new results on weak-interaction rates and the three-body Coulomb problem of muonic atoms are discussed. (orig.)

[en] In this brief article the current status on muonium spectroscopy with emphasis on recent developments will be summarized. The experimental and theoretical progress of the muonic helium atom will be reviewed. Future directions in this field of research will be discussed. (orig./HSI)

No abstract available