Abstract
The motion of excited recoiling atoms produced by \ensuremath{\beta} decay of ${}^{152}\mathrm{Eu}$ causes a Doppler broadening of subsequently emitted \ensuremath{\gamma} rays. The neutrino-induced Doppler-broadened \ensuremath{\gamma}-ray line shape is measured in oriented EuO single crystal targets using a high resolving power spectrometer. The motion and the slowing down of the emitting atoms depend on the forces exerted by the other atoms and on the direction of observation with respect to the crystal orientation. The comparison between measured and calculated \ensuremath{\gamma}-ray line shapes obtained by molecular dynamic simulation, permits to test different interatomic potentials and slowing down theories. The dependence of the observed line shape on the crystal orientation is also investigated.
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