Abstract The Antiproton Decelerator (AD) facility of CERN began operation in 1999 to serve
experiments for studies of CPT invariance by precision laser and microwave spectroscopy of …

We demonstrate the laser excitation of the n= 3 state of positronium (Ps) in vacuum. A
combination of a specially designed pulsed slow positron beam and a high-efficiency …

We demonstrate experimentally the production of Rydberg positronium (Ps) atoms in a two-
step process, comprising incoherent laser excitation, first to the 2 P 3 state and then to states …

The AEGIS experiment, currently being set up at the Antiproton Decelerator at CERN, has
the objective of studying the free fall of antimatter in the Earth's gravitational field by means …

experiment's main goal is to measure the local gravitational acceleration of antihydrogen
and thus perform a direct test of the weak equivalence principle with antimatter. In the first …

We describe a system designed to re-bunch positron pulses delivered by an accumulator
supplied by a positron source and a Surko-trap. Positron pulses from the accumulator are …

The two-center convergent close-coupling method is used to calculate antihydrogen (H¯)
formation via positronium (Ps) scattering on antiprotons (p¯) at near threshold energies. For …

Producing positronium (Ps) in the metastable 2 3 S state is of interest for various
applications in fundamental physics. We report here on an experiment in which Ps atoms …

The AEgIS Experiment is an international collaboration based at CERN whose aim is to
perform the first direct measurement of the gravitational acceleration g of antihydrogen in the …

Positronium in the 2 S 3 metastable state exhibits a low electrical polarizability and a long
lifetime (1140 ns), making it a promising candidate for interferometry experiments with a …