Attractive well of He–He from 3He–4He differential elastic scattering measurements

The elastic differential cross section for 3He–4He was measured at a relative collision energy of 0.799×10−14 erg, approximately five times the well depth. The data are fitted to a multiparameter potential form with ε/k=10.57 °K and rm=2.97 Å. Comparisons with recent experimental and theoretical helium potentials are made. No evidence for a significant isotope effect in the 3He–4He and 4He–4He interactomic potentials is found in this work.