Abstract
We report the first experimentally supported determination of the scattering length for positron scattering from krypton. Our result of −10.3 ± 1.5 a.u. compares favourably with that from a convergent close coupling calculation performed as a part of this investigation (−9.5 a.u.), and also with an earlier many body theory calculation of −10.1 a.u. from Gribakin and Ludlow [Phys. Rev. A 70, 032720 (2004)] and a polarized-orbital result of −10.4 a.u. from McEachran et al. [J. Phys. B 13, 1281 (1980)]. The present experimental scattering length supports the existence of a low-lying positron-krypton virtual state (Surko et al. [J. Phys. B 38, R57 (2005)]) at an energy ε = 0.13 eV.
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Zecca, A., Chiari, L., Trainotti, E. et al. Experimental determination of the scattering length for positron scattering from krypton. Eur. Phys. J. D 64, 317–321 (2011). https://doi.org/10.1140/epjd/e2011-20333-7
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DOI: https://doi.org/10.1140/epjd/e2011-20333-7