Calculation of the elastic collision properties of Na and Li atoms at ultracold temperature

This paper firstly reports a theoretical study of elastic scattering properties in a mixture of ²³Na and ⁷Li atoms at cold and ultracold temperatures in detail. Based on the new constructed accurate singlet X^1\varSigma_g^+ and the triplet a^3\varSigma_u^+ states interatomic potentials for ²³Na⁷Li mixture, it calculates the scattering lengths and the effective ranges by three computational methods, and obtains good agreements. Using the mass scaling method, it also calculates ²³Na⁶Li scattering lengths and s-wave and total elastic cross sections, whose rich resonance structures were found and interpreted in terms of quasibound diatomic levels trapped behind a centrifugal barrier.