Ultraslow p-bar-H collisions in hyperspherical coordinates: Hydrogen and protonium channels
- Department of Physics and J.R. Macdonald Laboratory, Kansas State University, Manhattan, Kansas 66506 (United States)
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 p-bar-H(1s) collision. A unified formulation of the collision and capture processes leading to formation of pp-bar bound states emerges. Both Pn(nl)-e{sup -} 'atomic-type' and p-bar-H(n{sup '}l{sup '}) 'molecular-type' states are represented. These potential curves are calculated to more than 10 000 protonium Bohr radii, where low-energy antiprotons are stopped in collisions with hydrogen atoms. Elastic and inelastic partial and total protonium formation cross sections in the mass-scaled p-bar-H system are calculated. The existence of protonium negative (or positive) ion in its ground and excited states is discussed.
- OSTI ID:
- 20634118
- Journal Information:
- Physical Review. A, Vol. 67, Issue 1; Other Information: DOI: 10.1103/PhysRevA.67.012704; (c) 2003 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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