Article Dans Une Revue Physical Review A : Atomic, molecular, and optical physics [1990-2015] Année : 1998

Antiproton-hydrogen annihilation at subkelvin temperatures

Résumé

The main properties of the interaction of ultralow-energy antiprotons (E<~10-6 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→H+p̅) is taken into account in the framework of a unitary coupled-channel 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 p̅H near-threshold metastable states is predicted. The dependence of protonium formation probability on the position of such near-threshold S-matrix singularities is analyzed. An estimation for the HH¯ annihilation cross section is obtained.

Dates et versions

in2p3-00000390 , version 1 (29-01-1999)

Identifiants

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A.Yu. Voronin, J. Carbonell. Antiproton-hydrogen annihilation at subkelvin temperatures. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 1998, 57, pp.4335-4345. ⟨10.1103/PhysRevA.57.4335⟩. ⟨in2p3-00000390⟩
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