The Flexure of a Prism with Cross-Section Bounded by a Cardioid

W. M. Shepherd
1936 Proceedings of the Royal Society A  
The interaction of two particles is considered according to the methods o f Quantum Electrodynamics, and to fix ideas we have considered the interaction o f a particle in the nucleus o f an atom with an electron in the K-shell. In this form the work is applicable to the theory of internal conversion. The nuclear particle is taken to be initially in an excited state, and in order to obtain an unambiguous result it is necessary to take into account its finite life-time in this state. We then
more » ... state. We then obtain a result which agrees with that found by Moller using correspondence methods. In terms o f the latter theory our results show that for bound particles it is essential to take the retarded potentials due to the transition where the first particle jumps down, and then consider these as perturbing the second particle. On the other hand, for free particles it is immaterial whether we take retarded or advanced potentials, and by taking the mean the result may be put in the symmetrical form which we expect for free particles. 500 W. M. Shepherd
doi:10.1098/rspa.1936.0064 fatcat:gljukwhvsveqxakdc66kno3uy4