Abstract
Molecular-dynamics simulations describing the slowing down of atoms in solids are used to study interatomic potentials in metals. This analysis is achieved by observing the fine structures of Doppler-broadened \ensuremath{\gamma} rays emitted by the recoiling excited nuclei. The recoil of the atom, \ensuremath{\sim}400 eV kinetic energy, is generated by the emission of a preceding \ensuremath{\gamma} ray following thermal-neutron capture. The experiment was performed with oriented single crystals of Fe and Cr as target and high-resolution \ensuremath{\gamma}-ray spectroscopy. Two different nuclear levels for each element were studied and the best interatomic potential among many available in the literature could be deduced from the data. The construction of a different potential was also investigated with this technique. Lifetime values with a much improved precision were obtained for four excited nuclear levels.
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