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论文类型：期刊论文

发表时间：2012-03-14

发表刊物：PHYSICAL REVIEW A

收录刊物：SCIE、EI、Scopus

卷号：85

期号：3

ISSN号：1050-2947

摘要：We present a theoretical model for describing ultracold atomic collision based on the multichannel quantum-defect theory. An analytical expression for the quantum-defect matrix Y is derived for the truncated 1/R-6 model potential, and threshold behaviors of the quantum-defect parameters are discussed. The model allows us to predict the Feshbach resonances when the singlet and triplet scattering lengths are known or to fit the scattering lengths when a couple of Feshbach resonances is located experimentally. As an illustrative example, we investigate the Li-6-K-40 scattering. The theoretical results agree quite well with experimental values.