Protonium formation in the p̄-H collision at low energies by a diabatic approach

Ultraslow p̄-H collisions in hyperspherical coordinates: Hydrogen and protonium channels

The collision of an antiproton and a hydrogen atom at ultralow energies is described in hyperspherical coordinates. An adiabatic approximation leads to potential-energy curves that can be used to describe the dynamics of capture in the p̄ -H(1s) collision. A unified formulation of the collision and capture processes leading to formation of pp̄ bound states emerges. Both Pn(nl)-e ‘‘atomic-type’’ a...

Non-Hermitian diabatic formulation of antiproton collision: protonium formation

We present a non-Hermitian coupled-channel resonant diabatic approach to Rydberg protonium formation in the ultraslow rearrangement collision p̄ − H → Pn + e−, where the kinetic coupling between the electronic and the nuclear motions is strong. We calculate complex diabatic potential energy curves and associated coupling matrix elements that vary smoothly with pp̄ distance. The [Pn – e]− resonanc...

Effect of strong p̄ - p nuclear forces on the rate of the low - energy three - body protonium formation reaction : p̄ + H μ ( 1 s ) → ( p̄p ) α + μ −

Abstract The effect of the strong p̄-p nuclear interaction in a three-charge-particle system with arbitrary masses is investigated. Specifically, the (p̄, μ−, p) system is considered, where p̄ is an antiproton, μ− is a muon and p is a proton. A numerical computation in the framework of a detailed few-body approach is carried out for the following protonium (antiprotonic hydrogen) formation three-b...

Protonium Formation in Antiproton–Hydrogen Collisions

We present a computation of the cross section of protonium formation in antiproton-hydrogen collisions using the nonlocal resonance model. It is based on restoration of the Born-Oppenheimer approximation, when the adiabatic electronic basis is replaced with the so called diabatic one. This allows us to separate the electron and hadron parts of our problem at the cost of a nonlocal potential in ...

Mass polarization effect on the resonant energies of p? -He+ ions and the protonium formation in low-energy antiproton hydrogen-atom collisions