Antiproton-Hydrogen annihilation at sub-kelvin temperatures

Details Antiproton-Hydrogen annihilation at sub-kelvin temperatures Antiproton-Hydrogen annihilation at sub-kelvin temperatures

1998-05-24

arxiv.org/abs/physics/9805033v1

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.

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