Abstract
A calculation is reported of the momentum distribution in liquid helium at absolute zero using a pair wave function and a modified superposition approximation. A value of 0 13 for the fraction of particles in the zero-momentum state is obtained. The approximations obtained for the momentum distribution function for small values of k is shown to be inaccurate. The use of an exact result for nk for small k leads to a modified distribution function which gives 0 25 for the fraction of particles in the zero-momentum state.
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