%0 Journal Article %J Physical Review A %D 2005 %T Multichannel quantum-defect theory for slow atomic collisions %A Bo Gao %A Eite Tiesinga %A Carl J. Williams %A Paul S. Julienne %X We present a multichannel quantum-defect theory for slow atomic collisions that takes advantages of the analytic solutions for the long-range potential, and both the energy and the angular-momentum insensitivities of the short-range parameters. The theory provides an accurate and complete account of scattering processes, including shape and Feshbach resonances, in terms of a few parameters such as the singlet and the triplet scattering lengths. As an example, results for $^{23}$Na-$^{23}$Na scattering are presented and compared close-coupling calculations. %B Physical Review A %V 72 %8 2005/10/28 %G eng %U http://arxiv.org/abs/physics/0508060v1 %N 4 %! Phys. Rev. A %R 10.1103/PhysRevA.72.042719