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The Feynman-Cohen model for rotons is shown to lead to an attractive interaction for two rotons at large distances and a repulsive interaction at short distances. The attractive interaction leads to a bound state of d symmetry in agreement with recent light-scattering data. The scattering of rotons arises from the repulsive interaction, and the experimental data on roton-roton scattering lead to an estimate of the range of repulsive interaction.
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Yau et al. (1971) studied this question.
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