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VOLUME 53 (1991) | ISSUE 2 | PAGE 69
Observation of intensified forward γ-ray emission in spontaneous nuclear decay
A nuclear target which is an essentially black absorber for resonant χ-ray emission becomes a strong emitter of γ rays in the forward direction after irradiation of this target is ended abruptly. A magnetic-resonance device was used to chop a y-ray beam in order to observe this effect. The operating time of this chopper is much shorter than the time scale of the spontaneous decay of the excited nuclear state.