Abstract
Due to the dominant electron capture by positrons from the molecular shell and the spatial dephasing across the shell width, a powerful diffraction effect universally underlies the positronium (Ps) formation from fullerenes. This results in trains of resonances in the Ps formation cross section as a function of the positron beam energy, producing structures in recoil momenta in analogy with classical single-slit diffraction fringes in the configuration space. This work opens a hitherto unknown avenue of Ps spectroscopy with nanomaterials and motivates level-differential measurements.
- Received 28 September 2016
DOI:https://doi.org/10.1103/PhysRevA.95.020701
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