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Positron elastic scattering from alkaline earth targets

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Abstract

A previously reported model potential approach [Poveda et al., Phys. Rev. A 87, 052702 (2013)] was extended to study low energy positron elastic scattering from beryllium and magnesium. The cross sections were computed for energies ranging from 10-5 eV up to well above the positronium formation threshold. The present results are in good agreement with previous reports, including the prediction of a p-wave resonance in the cross section for magnesium. The emergence of this shape resonance is connected to a trend observed in the evolution of the partial wave cross section in going from Be to Mg target. This trend lead us to speculate that a sharp d-wave resonance should be observed in positron elastic scattering from calcium. The positron-target binding energies are investigated in detail, both using the scattering information and by direct computation of the bound state energies using the model potentials.

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Authors and Affiliations

  1. Centro Federal de Educação Tecnológica de Minas Gerais, Amazonas 5253, 30421-169, Belo Horizonte, MG, Brasil

    Luis A. Poveda

  2. Departamento de Física, Centro de Ciências Exatas, Universidade Federal do Espírito Santo, 29075-910, Vitória, ES, Brasil

    Denise Assafrão

  3. Laboratório de Átomos e Moléculas Especiais, Departamento de Física, ICEx, Universidade Federal de Minas Gerais, PO Box 702, 30123-970, Belo Horizonte, MG, Brasil

    José R. Mohallem

Authors
  1. Luis A. Poveda
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  2. Denise Assafrão
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  3. José R. Mohallem
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Correspondence to Luis A. Poveda.

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Poveda, L., Assafrão, D. & Mohallem, J. Positron elastic scattering from alkaline earth targets. Eur. Phys. J. D 70, 152 (2016). https://doi.org/10.1140/epjd/e2016-70120-y

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  • DOI: https://doi.org/10.1140/epjd/e2016-70120-y

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