Neutron inelastic scattering with high momentum transfers was used to probe the single-particle motions in liquid ⁴He at temperatures ranging from 4.2 to 1.27^∘{}K. The observed scattered neutron distributions below T_λ are consistent with a two-component model of liquid helium involving condensation into a zero-momentum ground state. A fractional condensate density of (7.4±{}1.5)% and an average kinetic energy per particle of 14.1±{}0.6^∘{}K for helium at 1.27^∘{}K is deduced from a comparison of the experimental results with a theory for high-energy neutron-liquid-He scattering.
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O. K. Harling (1970) studied this question.
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