Resonant forward nuclear scattering of γ rays after a stepped change in the energy of an excited nuclear state
Shvyd'ko Yu. V., Popov S. L., Smirnov G. V.
The forward rescattering of γ rays by an ensemble of resonant nuclei after reversal of the hyperfine magnetic field has been studied. The experimental data show that the energy of the intermediate excitation in the system of nuclei is changed by the field reversal. The excitation decays spontaneously, with a coherent enhancement of the radiative channel and a forward emission of γ rays at a shifted frequency.