Anomalous states of positronium
@article{Patterson2019AnomalousSO, title={Anomalous states of positronium}, author={C. Patterson}, journal={Physical Review A}, year={2019}, volume={100}, pages={062128} }
The energies and wave functions of the two-body Dirac equation for positronium are compared with those of the Pauli approximation and the Bethe-Salpeter equation. The unusual behavior of the ground-state wave function of the Dirac equation is explained in terms of anomalous bound-state solutions
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