Abstract
A recently developed formalism for Helium II is generalized by introducing a 2-body interaction of spheres with diameter depending on the momentum exchanged between two atoms in an interaction process. A larger class of atomic collisions is also admitted. These modifications allow to account for some details of the interatomic potential V He (r) between two 4 He atoms, which were previously disregarded, and to improve the theoretical graphs of Helium II momentum distribution and normal fluid fraction.
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