Abstract
A theoretical investigation shows that there should be a correlation between the directions of propagation of the quanta emitted in two successive transitions of a single radiating system. This correlation is described by a function which gives the relative probability that the second quantum will be emitted at an angle with the first; is determined by the angular momenta of the three levels involved in the two transitions and by the multipole order of the radiation emitted in these transitions. The explicit forms of for all angular momenta and for dipole and quadrupole radiation are given; experimental determination of in any given case should limit these factors to a small number of possibilities. This has particular interest as a means of investigating the nuclear energy levels involved in -radiation; here should be observable by measuring the variation with of gamma-gamma coincidence counting rates.
- Received 6 May 1940
DOI:https://doi.org/10.1103/PhysRev.58.122
©1940 American Physical Society