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- W2013184698 abstract "The experimental values of the integral dechannelling function of protons with 1 MeV initial energy are presented. The values have been obtained for the four most open channels of W crystal and six channels of Ge crystal. The dechannelling mechanism due to crystal atom thermal vibrations is discussed. The fact is taken into account that not only the particle momentum fluctuations but also the fluctuations of particle position in the transverse plane after a scattering event give rise to the changes of the transverse energy when the particle is scattered by a displaced chain atom. The correlations of thermal displacements of crystal atoms have been included by examining the result of scattering by an individual atomic string. The correlations have been shown to result in the appearance of the factor (1+ Sigma j gamma ij) in the addend ( delta pperpendicular to 2)/2M1 in the expression of the dechannelling rate (here gamma ij are the correlation coefficients of thermal displacements of atoms). The integral dechannelling function is calculated using the values of gamma ij obtained in the framework of the Debye approximation. The contribution from multiple scattering by electrons to the dechannelling is discussed on the basis of the methods developed earlier to calculate the channelled particle energy loss. The comparison with experimental data has shown that the inclusion of the correlations of the crystal thermal vibrations can significantly improve the agreement with experiment. The results obtained may be treated to be a substantiation for the possibility of deriving fresh information about lattice vibrations from the experimental data on the dechannelling." @default.
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- W2013184698 date "1982-08-20" @default.
- W2013184698 modified "2023-09-26" @default.
- W2013184698 title "The effect of lattice thermal vibrations on particle dechannelling" @default.
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- W2013184698 doi "https://doi.org/10.1088/0022-3719/15/23/015" @default.
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