Medium modification of two-particle scattering in nonideal Bose systems

Details Medium modification of two-particle scattering in nonideal Bose systems Medium modification of two-particle scattering in nonideal Bose systems

1998-02-27

arxiv.org/abs/physics/9802052v1

Phys.Rev. A55 (2000) 1945

Physics

Atomic Physics

Scientific paper

10.1103/PhysRevA.55.1945

Medium modification of scattering properties in interacting Bose systems are considered by solving the Bethe-Salpeter equation. An equation of state for the normal phase (generalized Beth-Uhlenbeck formula) is given using the in-medium phase shifts to include two-particle correlations. Conclusions are drawn for systems of bosonic atoms with repulsive interaction such as sodium $^{23}$Na and rubidium $^{87}$Rb. It is shown that the in-medium scattering length and the absolute value of the in-medium scattering phase shift for low scattering energies increase with density.

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