Abstract
The departure from exact 180° angular correlation of quanta resulting from positrons annihilating in various materials has been measured. This provides data as to the momenta of the centres of mass of the annihilating electron-positron pairs. It does not appear possible to account for the data on the assumption that the positron achieves thermal energy by lattice collisions before annihilating, so that such measurements may not be simply related to the momentum distribution of the more loosely bound electrons in the absorbing substance.
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