The hadronic width of the ground state of pionic hydrogen has been redetermined by X-ray
spectroscopy to be\varGamma^ π H _ 1s=(856\, ±\, 16_ stat\, ±\, 22_ sys) Γ 1 s π H=(856±16 …

The strong-interaction shift ε 1 s π D and broadening Γ 1 s π D in pionic deuterium have
been determined in a high statistics study of the π D (3 p-1 s) X-ray transition using a high …

The hadronic shift in pionic hydrogen has been redetermined to be ε 1 s= 7.086±0.007
(stat)±0.006 (sys) eV by X-ray spectroscopy of ground-state transitions applying various …

The recent Lamb shift experiment at PSI and the discussions about the incompatibility of the
proton radii extracted using different methods have revived the interest in the measurement …

A set of 14 high-accuracy x-ray transition energies in the 2.4–3.1 keV range is presented,
which can be used as x-ray standards. They were measured in two-to four-electron sulfur …

An unusual but effective way to determine at threshold the d π↔ NN transition strength α is
to exploit the hadronic ground-state broadening Γ 1 s in pionic deuterium, accessible by x …

Ab initio study of the density-dependent population and lifetime of the long-lived (μ p) 2 s
and the yield of (μ p) 1 s atoms with kinetic energy 0.9 keV have been performed. The direct …

The kinetic energy distributions of μ− p and π− p atoms at a time of the radiative np→ 1 s
transitions and charge-exchange reaction (in case of π− p) have been studied in the …

The K β transition in muonic hydrogen was measured with a high-resolution crystal
spectrometer. The spectrum is shown to be sensitive to the ground-state hyperfine splitting …

The quantum-mechanical calculations of the differential and integrated cross sections of the
elastic scattering, Stark transitions, and Coulomb deexcitation at collisions of excited μ− p …