Ultraslow p¯-H collisions in hyperspherical coordinates: Hydrogen and protonium channels

B. D. Esry and H. R. Sadeghpour
Phys. Rev. A 67, 012704 – Published 14 January 2003
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Abstract

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¯H(1s) collision. A unified formulation of the collision and capture processes leading to formation of pp¯ bound states emerges. Both Pn(nl)e “atomic-type” and p¯H(nl) “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¯-H system are calculated. The existence of protonium negative (or positive) ion in its ground and excited states is discussed.

  • Received 4 May 2001

DOI:https://doi.org/10.1103/PhysRevA.67.012704

©2003 American Physical Society

Authors & Affiliations

B. D. Esry*

  • Department of Physics and J.R. Macdonald Laboratory, Kansas State University, Manhattan, Kansas 66506

H. R. Sadeghpour

  • Institute for Theoretical Atomic and Molecular Physics, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138

  • *Email address: esry@phys.ksu.edu
  • Email address: hsadeghpour@cfa.harvard.edu

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Vol. 67, Iss. 1 — January 2003

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