Sympathetic cooling of Li-6 atoms

We use recently measured cold photoassociation and two-photon data to extract the singlet and triplet accumulated radial phases of interacting ground-state lithium atoms. Using the resulting values we predict scattering lengths, Feshbach resonances, and exchange decay rates for cold collisions between Li-7 and Li-6 atoms that are of interest for the possibility of sympathetic cooling of Li-6 and for the coexistence of the bosonic and fermionic quantum-degenerate phases of Li-7 and Li-6. In addition, we calculate scattering lengths and exchange decay rates for cold collisions between identical lithium isotopes in different hyperfine states. These quantities are used to examine the possibilities of coexisting Li-7 Bose condensates and of evaporatively cooling coexisting Li-6 subsystems.