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Medium modification of two-particle scattering in nonideal Bose systems

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arxiv physics/9802052 v1 pith:TFZCNL44 submitted 1998-02-27 physics.atom-ph cond-mat.stat-mechnucl-thphysics.acc-ph

H. Stein , K. Morawetz , G. Röpke This is my paper · ORCID
classification physics.atom-phcond-mat.stat-mechnucl-thphysics.acc-ph
keywords scatteringin-mediumphasesystemsboseequationmediummodification
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abstract

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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