Stepwise Phase Modulation of Recoilless Gamma Radiation in a Coincidence Experiment: Gamma Echo.

摘要

Classical phase modulation theory is applied to describe the interference of the recoil-free gamma radiation fields emitted by a Mossbauer source and a resonant absorber in forward scattering geometry. During the exponential decay of the excited state in the source the resonant absorber develops and emits a coherent field, which interferes destructively with the source field. Here, a detailed description of the experimental and theoretical aspects of step-wise phase modulation in a coincidence scheme is given. Theoretical results are presented in a general form, taking into account the experimental nonidealities. The properties of the mechanical drive system are discussed in detail. Novel gamma echo data are presented. Good agreement between the theoretical calculations and the experimental data has been established.