Antiproton collisions with excited positronium

Authors

M. Charlton, Swansea University
H. B. Ambalampitiya, University of NebraskaFollow
Ilya I. Fabrikant, University of Nebraska-LincolnFollow
I. Kalinkin, Curtin University
D. V. Fursa, Curtin University
A. S. Kadyrov, Curtin University
I. Bray, Curtin University

Date of this Version

1-19-2023

Citation

PHYSICAL REVIEW A 107, 012814 (2023). DOI: 10.1103/PhysRevA.107.012814

Comments

Used by permission.

Abstract

We present results of calculations of several processes resulting from positronium (Ps) collisions with antiprotons: antihydrogen formation, Ps breakup, and n_Ps-changing collisions. Calculations utilize the quantum convergent close-coupling (CCC) method and the classical trajectory Monte Carlo (CTMC) method. We identify a region of Ps principal quantum numbers n_Ps and Ps energies where the classical description is valid and where the CCC calculations become computationally too expensive. This allows us to present the most complete and reliable set of cross sections in a broad range of n_Ps and initial orbital momentum quantum numbers lPs which are necessary for experiments with antihydrogen at CERN.