Cross sections for antiproton capture by helium ions

Journal Article · Thu Jul 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.012501· OSTI ID:21442905

Sakimoto, Kazuhiro ^[1]

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1. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Yoshinodai 3-1-1, Chuo-ku, Sagamihara, Kanagawa 252-5210 (Japan)

Accurate quantum-mechanical calculations are carried out for antiproton capture by singly ionized He ions, that is, p-bar+He{sup +}{yields}p-barHe{sup 2+}+e, by the combined use of an R-matrix method and direct numerical solution. The total capture cross sections (or collision strengths) and the state distributions of the capture products, p-barHe{sup 2+}, are calculated at collision energies ranging from 0 to 4 eV. The present system is rich in resonances, which appear as a Rydberg series and are characterized as an electron attached to an ion core, p-barHe{sup 2+}. Some resonance levels can be reproduced by a reasonable model based on molecular-quantum-defect theory. The capture into the highest energetically possible state of the products, p-barHe{sup 2+}, always takes place overwhelmingly in the presence or absence of the resonances. However, owing to the resonances, the angular momentum distribution of the products varies considerably depending on the collision energy. The energy-averaged capture cross sections and the capture rate coefficients are also presented for the convenience of future experiments.

• OSTI ID: 21442905
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 1 Vol. 82; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR MOMENTUM
ANTIBARYONS
ANTIMATTER
ANTINUCLEI
ANTINUCLEONS
ANTIPARTICLES
ANTIPROTONS
BARYONS
CAPTURE
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EV RANGE
EXCITED STATES
FERMIONS
HADRONS
HELIUM IONS
ION COLLISIONS
IONS
LEPTONS
MATHEMATICAL SOLUTIONS
MATRICES
MATTER
MECHANICS
NUCLEI
NUCLEONS
NUMERICAL SOLUTION
PROTONS
QUANTUM MECHANICS
R MATRIX
RESONANCE
RYDBERG STATES