The small-k behavior of the static structure factor $S(k)$ in a noble gas fluid is related to the two- and three-body part of the long-range interatomic potential, the London and Axilrod-Teller interaction, respectively. We have measured the $S(k)$ of xenon at room temperature and four low densities by means of a small angle neutron diffractometer. A careful data analysis has allowed the determination of the strength of the long-range pair potential as well as the clear detection of the three-body effect, whose intensity has been directly obtained.
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Formisano et al. (1998) studied this question.
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