Laser spectroscopy of muonic atoms has been recently used to probe properties of light
nuclei with unprecedented precision. We introduce nuclear effects in hydrogen-like atoms …

A comprehensive theory of the Lamb shift in light muonic atoms such as μ H, μ D, μ 3 He+,
and μ 4 He+ is presented, with all quantum electrodynamic corrections included at the …

Transition frequencies and fine-structure splittings of the 2 S 1 3→ 2 P 3 J transitions in
helium-like C 4+ 12 were measured by collinear laser spectroscopy on a 1-ppb level …

We have derived the complete formula for the α 7 m contribution to energy levels of an
arbitrary triplet state of the helium atom, performed numerical calculations for the 2 3 S and 2 …

Light-ion trap (LIONTRAP), a high-precision Penning-trap mass spectrometer, was used to
determine the atomic mass of He 4. Here, we report a 12 parts-per-trillion measurement of …

In April 2021, scientists active in muon physics met to discuss and work out the physics case
for the new High-Intensity Muon Beams (HIMB) project at PSI that could deliver of order …

In a recent breakthrough in first-principles calculations of two-electron systems, Patkóś,
Yerokhin, and Pachucki [Phys. Rev. A 103, 042809 (2021) PLRAAN 2469-9926 …

Collinear laser spectroscopy has been performed on He-like C 4+ ions extracted from an
electron-beam ion source (EBIS). In order to determine the transition frequency with the …

To test bound-state quantum electrodynamics (BSQED) in the strong-field regime, we have
performed high precision x-ray spectroscopy of the 5 g–4 f and 5 f–4 d transitions (BSQED …

The ground-breaking works of Weinberg have opened the way to calculations of atomic
nuclei that are based on systematically improvable Hamiltonians. Solving the associated …