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论文类型：期刊论文

发表时间：2015-04-23

发表刊物：PHYSICAL REVIEW A

收录刊物：SCIE、EI、Scopus

卷号：91

期号：4

ISSN号：1050-2947

摘要：We present a simple theoretical model for describing ultracold-atomic collision dynamics and Feshbach resonances (FRs) without onerous numerical computation. An effective quantum-defect phase shift delta(eff)(Y) is derived and the reference potentials are shown acting as an assistant tool in the calculation. With the help of singlet and triplet scattering lengths a(S) and a(T), as well as an adjustable parameter gamma(sr), this model can be used to reliably predict FRs. An application example of Li-6-K-40 collision shows that the results given by the simple model agree quite well with both the relevant experimental data and the coupled-channel calculations.