https://doi.org/10.1140/epjd/e2016-70120-y
Regular Article
Positron elastic scattering from alkaline earth targets*,**
1 Centro Federal de Educação
Tecnológica de Minas Gerais, Amazonas 5253, 30421-169 Belo Horizonte, MG, Brasil
2 Departamento de Física, Centro de
Ciências Exatas, Universidade Federal do Espírito Santo, 29075-910
Vitória, ES, Brasil
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
a
e-mail: poveda.calvino@gmail.com
Received:
21
February
2016
Received in final form:
4
May
2016
Published online:
12
July
2016
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.
Contribution to the Topical Issue “Advances in Positron and Electron Scattering”, edited by Paulo Limao-Vieira, Gustavo Garcia, E. Krishnakumar, James Sullivan, Hajime Tanuma and Zoran Petrovic.
Supplementary material in the form of one pdf file available from the Journal web page at http://dx.doi.org/10.1140/epjd/e2016-70120-y
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2016
