Antihydrogen-Hydrogen annihilation at sub-kelvin temperatures
Abstract
Annihilation cross-section of ultra low-energy atomic antihydrogen (% E\le10^{-5} a.u.) on atomic hydrogen are calculated within a quantum mechanical coupled channels approach. The results differ from the extrapolations of semiclassical models to low energies. The main features of the observables are found to be determined by a family of H\bar{H} nearthreshold states.