Resonance phenomena and threshold features in positron–helium scattering

doi:10.1088/1674-1056/21/5/053402

Abstract Investigations of resonances and threshold behaviors in positron--helium scattering have been made using the momentum-space coupled-channels optical method. The positronium formation channels are considered via an equivalent-local complex potential. The s-wave resonances and the Wigner cusp feature at the positronium (n=1) formation threshold are compared with the previous reports. The p-and the d-wave resonances and a Wigner cusp feature at the positronium (n=2) formation threshold are reported for the first time.

Keywords: positron helium resonance

Received: 09 January 2012
Revised: 27 April 2012
Accepted manuscript online:

PACS:

34.80.Uv

(Positron scattering)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10674055)

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Yu Rong-Mei(于荣梅), Cheng Yong-Jun(程勇军), Wang Yang(王旸), and Zhou Ya-Jun(周雅君) Resonance phenomena and threshold features in positron–helium scattering 2012 Chin. Phys. B 21 053402

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Resonance phenomena and threshold features in positron–helium scattering

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