Angular Correlation Effects with Annihilation Radiation

@article{Pryce1947AngularCE,
  title={Angular Correlation Effects with Annihilation Radiation},
  author={Maurice Henry Lecorney Pryce and J. CLIFTON Ward},
  journal={Nature},
  year={1947},
  volume={160},
  pages={435-435}
}
IF the two gamma-quanta emitted on the annihilation of a slowly moving positron-electron pair both undergo a Compton scattering, in view of the fact that they are polarized in perpendicular directions, it is reasonable to expect that the scatter distributions will be correlated in azimuthal angle. Fig. 1 shows the expected state of affairs. It has recently been proposed by R. C. Hanna to detect this effect, using counters to observe coincidences of the scattered quanta. With the view of… 
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