Low-energy capture of antiprotons by helium ions
Journal Article
·
· Physical Review. A
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Yoshinodai, Sagamihara 229-8510 (Japan)
Low-energy antiproton capture, p+He{sup +}{yields}pHe{sup 2+}+e, is investigated using a wave-packet-propagation full-quantum-mechanical method or a quantum-classical hybrid (i.e., semiclassical) approximation. If the adiabatic picture (i.e., Born-Oppenheinmer separation) is a good approximation, the antiproton capture, which is a typical nonadiabatic process, can rarely occur. It is found that the probability of the nonadiabatic transition is small (at most {approx}0.1). However, even in the zero energy limit (E{yields}0), the antiproton capture always occurs for the total angular momenta J(less-or-similar sign)40. Correspondingly, the cross section for the antiproton capture diverges as E{yields}0. This happens due to the peculiarity that the Coulomb force range is longer than the centrifugal one. The importance of a Rydberg series of resonances in the capture process is emphasized. On the low-energy dynamical feature, some interesting similarities to the e+ion system are also found.
- OSTI ID:
- 20853070
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 74; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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