Ultrasound-induced echoes in the nuclear-exciton decay utilising synchrotron radiation Bragg-scattered by a quartz crystal
Universität Ulm Albert-Einstein-Allee 11, D-89081 Ulm, Germany
2 Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany
Accepted: 11 September 1997
The time evolution of the coherent decay of the nuclear exciton induced by 14.4 keV synchrotron radiation was observed with a system of two stainless-steel resonance absorbers. In between these foils, the radiation was Bragg-scattered from a vibrating quartz crystal. The ultrasound-modulated radiation disrupts the coherent superposition of the radiation from both targets. However, at times corresponding to multiples of the ultrasound period, spikes or dips in the decay were observed which are interpreted as ultrasound-induced echoes.
PACS: 76.80.+y – Mössbauer effect; other γ-ray spectroscopy / 63.20.-e – Phonons in crystal lattices / 78.70.-g – Interactions of particles and radiation with matter
© EDP Sciences, 1997