Elastic collision properties of ultracold calcium atoms

Author： Zhang Ji-Cai Sun Jin-Feng Zhu Zun-Lue Liu Yu-Fang

ISSN： 1402-4896

Source： Physica Scripta, Vol.87, Iss.2, 2013-02, pp. : 25302-25305

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Abstract

The s-wave scattering lengths are obtained for all stable isotope combinations of Ca atoms and those values are very sensitive to small changes of the reduced mass. These results rely on a recent measurement of the ⁴⁰Ca-⁴⁰Ca scattering length in a Bose condensate of ⁴⁰Ca and making small corrections to a Born-Oppenheimer potential that reproduces all known spectroscopic data. We find that the ⁴²Ca isotope has a scattering length of 417.5a₀ and, thus, can be Bose condensed. The large interisotope scattering length between ⁴³Ca and ⁴²Ca indicates that sympathetic cooling of ⁴³Ca by ⁴²Ca atoms will be effective, and ⁴³Ca-⁴²Ca can also be used to study isotopic Bose-Fermi mixtures. We also predict a d-wave shape resonance for collisions of fermionic ⁴³Ca atoms in different spin components.