Abstract
Energy spectra of nuclear inelastic absorption of synchrotron radiation in $\ensuremath{\alpha}$-$^{57}\mathrm{Fe}$ were measured with 4.4-meV energy resolution in a temperature range 24-400 K. The temperature dependence of the recoil fraction and of the multiphonon contribution was determined. The density of phonon states was derived at each temperature and showed a 4% relative frequency change within the studied temperature range.
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