R-matrix calculation of negative muon capture by helium ions

Journal Article · Wed Jul 15 04:00:00 EDT 2009 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.80.012517· OSTI ID:21313259

Sakimoto, Kazuhiro ^[1]

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1. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Yoshinodai, Sagamihara 229-8510 (Japan)

Negative muon ({mu}{sup -}) capture by helium ions (He{sup +}), i.e., {mu}{sup -}+He{sup +}{yields}{mu}{sup -}He{sup 2+}+e, is investigated by carrying out a rigorous R-matrix quantum-mechanical calculation. The present exotic reaction exhibits a Rydberg series of resonances, which are described as an electron attached to an ion core {mu}{sup -}He{sup 2+}, or in other words as a Feshbach type originating from the product channel {mu}{sup -}He{sup 2+}+e. The series limit of the resonances is the excited-state energy of {mu}{sup -}He{sup 2+}. The {mu}{sup -} capture cross sections (or collision strengths) and their energy-averaged quantities are calculated at collision energies up to 7 eV. At a rough guess, a resonance bunch belonging to each Rydberg state appears in the form of two humps. The final-state distribution of the product ions {mu}{sup -}He{sup 2+} is also presented. The highest energetically possible states are mostly occupied by {mu}{sup -}He{sup 2+} at all the energies. However, the angular momentum distribution of {mu}{sup -}He{sup 2+} becomes quite different in individual cases of resonances.

• OSTI ID: 21313259
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 1 Vol. 80; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANIONS
CAPTURE
CROSS SECTIONS
ELECTRONS
EV RANGE 01-10
HELIUM IONS
MESONS
MUON-ATOM COLLISIONS
MUONIC ATOMS
MUONS MINUS
MUONS PLUS
QUANTUM MECHANICS
R MATRIX
RESONANCE
RYDBERG STATES