We report the results of a new measurement of the positronium 2 S 3 1→ 2 P 3 2 (ν 2)
interval. Using a modified experimental arrangement we have significantly reduced the …

We describe the experimental production of a beam of 2 3 S 1 positronium (Ps) atoms
obtained from charge-exchange collisions between a positron beam and Xe held in a gas …

We have measured the spin polarization of a slow positron beam via state-selective
depopulation of 2 S 1 3 positronium atoms, generated by passing the beam through a gas …

We report the results of a new measurement of the positronium Precision Microwave
Spectroscopy of the Positronium 2 ³S₁→ 2 ³P₂ (v₂) interval. Using a modified …

We calculate hard spin-independent contributions to energy levels in muonium and
positronium which are due to radiatively corrected electron factor insertion in two-photon …

The Standard Model predicts a long-range force mediated by a pair of neutrinos, known as"
the neutrino force." We derive an expression for this force that is valid for all $ r $. For large …

SH Reeder, SD Hogan, DB Cassidy Page 1 Precision measurements of positronium (Ps) can
be considered to be direct tests of QED theory, and potential harbingers of physics beyond …