This article reviews recent investigations on the phenomenon of Bose-Einstein
condensation of dilute gases. Since the experimental observation of quantum degeneracy in …

This volume gives an up-to-date, systematic account of the microscopic theory of Bose-
condensed fluids developed since the late 1950s. In contrast to the usual phenomenological …

An investigation of the structure of liquid He 4 at saturated vapor pressure by means of
neutron diffraction is reported for 11 temperatures in the range 1.00 to 4.27 K. At each …

Abstract The Green's-function Monte Carlo method has been used to calculate the
properties of the ground-state He 4 with several modern potentials. One potential, dubbed …

The momentum distribution function, n (p→), is determined for liquid He 4 at 1.00, 2.12, 2.27,
and 4.27 K from new neutron inelastic-scattering measurements at large momentum …

We present the results of measurements of the liquid structure factor, S (k), for liquid He 4 at
saturated vapor pressure at seven temperatures between 1.38 and 4.24 K over the …

Neutron-scattering techniques have been used to determine the momentum distribution n
(p→) for He 4 for different temperatures and densities. n (p→) is found to be a strong function …

The macroscopic properties are derived in as exact a manner as possible by making use of
the exact microscopic equations of motion without attempting to solve them explicitly. The …

A new method for the experimental determination of the condensate fraction, n 0, of
superfluid He 4 is presented. This method, which depends on the temperature variation of …

By applying the method of Hyland, Rowlands, and Cummings to pair-correlation functions
obtained from new high-accuracy neutron-diffraction measurements, the condensate …