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Coupled channel effects on resonance states of positronic alkali atom

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Abstract

S-wave Feshbach resonance states belonging to dipole series in positronic alkali atoms (e+Li, e+Na, e+K, e+Rb and e+Cs) are studied by coupled-channel calculations within a three-body model. Resonance energies and widths below a dissociation threshold of alkali-ion and positronium are calculated with a complex scaling method. Extended model potentials that provide positronic pseudo-alkali-atoms are introduced to investigate the relationship between the resonance states and dissociation thresholds based on a three-body dynamics. Resonances of the dipole series below a dissociation threshold of alkali-atom and positron would have some associations with atomic energy levels that results in longer resonance lifetimes than the prediction of the analytical law derived from the ion–dipole interaction.

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Authors and Affiliations

  1. Department of Chemistry, Tohoku University, Sendai, 980-8578, Japan

    Takuma Yamashita & Yasushi Kino

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  1. Takuma Yamashita
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  2. Yasushi Kino
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Correspondence to Takuma Yamashita.

Additional information

Contribution to the Topical Issue “Low Energy Positron and Electron Interactions”, edited by James Sullivan, Ron White, Michael Bromley, Ilya Fabrikant and David Cassidy.

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Yamashita, T., Kino, Y. Coupled channel effects on resonance states of positronic alkali atom. Eur. Phys. J. D 72, 13 (2018). https://doi.org/10.1140/epjd/e2017-80542-6

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