Preliminary results of the strong interaction shift and width in pionic hydrogen (πH) using an X-ray spectrometer with spherically bent crystals and CCDs as X-ray detector are presented. In the experiment at the Paul Scherrer Institute three different (np → 1s) transitions in πH were measured. Moreover the pion mass measurement using the (5 → 4) transitions in pionic nitrogen and muonic oxygen ...

We have calculated differential, total and transport cross sections for muonic hydrogen in the n = 2 state scattering from hydrogen. The metastable fraction of the 2S state that slows down below the 2P threshold without undergoing collisional quenching has been calculated as a function of the initial kinetic energy using a Monte Carlo kinetics program. Contrary to earlier estimates, the metasta...

Results of the experimental project using ne| ive muon spin rotation at Lawrence Berkeley Laboratory are reported. The following ave been discussed briefly, i) The bound muon g factors from the viewpoints of the relativistic and nuclear polarization effects, ii) Strange depolarization phenomena in terms of the difference between the muonic-atom probe and its equivalent nuclear probe iii) Applic...