非理想玻色系统中两粒子散射的介质修正
Medium modification of two-particle scattering in nonideal Bose systems
摘要：
通过求解Bethe-Salpeter方程，研究了相互作用玻色系统中散射性质的介质修正。利用介质内相移给出了正常相的状态方程（广义Beth-Uhlenbeck公式），以包含两粒子关联。结论得出的玻色子原子系统的排斥相互作用，如钠$^{23}$钠和铷$^{87}$ Rb。结果表明，低散射能量的介质中散射长度和介质中散射相移的绝对值随密度的增加而增加。
英文摘要：
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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