Angular Correlation Effects with Annihilation Radiation
Abstract
IF the two gammaquanta emitted on the annihilation of a slowly moving positronelectron 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 assisting the design of the experiment, we have calculated the magnitude of the effect to be expected. We find that the differential double crosssection is given by where r_{0} is the classical electron radius, and dΩ_{1}, dΩ_{2} are elements of solid angle for quanta 1 and 2 respectively.
 Publication:

Nature
 Pub Date:
 September 1947
 DOI:
 10.1038/160435a0
 Bibcode:
 1947Natur.160..435P