A researcher whose team compared bosons and fermions using nearly identical trapped-cloud conditions. The contrasting pair correlations of helium-4 and helium-3 therefore isolated exchange statistics rather than ordinary attractive or repulsive forces between particles.[ref]
Comparison of the Hanbury Brown-Twiss effect for bosons and fermions by T. Jeltes and others. Abstract and pp. 3–4: matched trapping conditions and negligible interactions
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