Physics – Atomic Physics
Scientific paper
1998-05-24
Physical Review A, vol.57 n.5 (1998)
Physics
Atomic Physics
latex.tar.gz file, 22 pages, 9 figures
Scientific paper
10.1103/PhysRevA.57.4335
The main properties of the interaction of ultra low-energy antiprotons ($% E\le10^{-6}$ a.u.) with atomic hydrogen are established. They include the elastic and inelastic cross sections and Protonium (Pn) formation spectrum. The inverse Auger process ($Pn+e \to H+\bar{p}$) is taken into account in the framework of an unitary coupled-channels model. The annihilation cross-section is found to be several times smaller than the predictions made by the black sphere absorption models. A family of $\bar{p}H$ nearthreshold metastable states is predicited. The dependence of Protonium formation probability on the position of such nearthreshold S-matrix singularities is analysed. An estimation for the $H\bar{H}$ annihilation cross section is obtained.
Carbonell Jaime
Voronin Alexei Yu.
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