Wave-packet analysis of multichannel resonances in positron scattering by a helium ion

Journal Article · Wed Dec 01 04:00:00 EST 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.70.062701· OSTI ID:20649932

Yamanaka, Nobuhiro; Kino, Yasushi; Ichimura, Atsushi ^[1]

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1. RIKEN - Institute of Physical and Chemical Research, Wako, Saitama 351-0198 (Japan)

We present the wave-packet analysis for two S-wave resonances in positron scattering by a helium ion whose existence was predicted by Bhatia and Drachman but has been controversial. The evolution of the wave packet is solved to exhibit temporary formation of the quasistationary state. For both the resonances, the position and width are determined through the resulting time delays in a consideration of a multichannel nature to agree with those by previous variational eigenenergy calculations. It is further found that the lower resonance dominantly forms from, and decays into, the n=2 states of the helium ion, while the higher one the n=3 states.

• OSTI ID: 20649932
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 70; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
DECAY
EVOLUTION
HELIUM IONS
LEVEL WIDTHS
POSITRON-ATOM COLLISIONS
POSITRONS
RESONANCE
S STATES
S WAVES
SCATTERING
TIME DELAY
VARIATIONAL METHODS
WAVE PACKETS