Momentum distributions of liquid para-hydrogen were determined by means of inelastic neutron scattering under applied pressures ranging from $1\text{to}80\text{bars}$, at $T=16.5\mathrm{K}$. The data processing procedure involves the parametrization of the dynamic structure factor and yields a set of momentum distributions as functions of the density. The results depict significant pressure dependences for all single-particle quantities such as the momentum distributions and average kinetic energies as well as for the final-state effects. The obtained results enable us to quantify the departure of the momentum distributions from classical Maxwell-Gauss shape. Such observations are then rationalized with the help of calculations that were carried out in terms of the correlated density matrix formalism.

• Received 26 January 2006

DOI:https://doi.org/10.1103/PhysRevB.73.144203