Feshbach resonances in ultracold 39K

Chiara d'Errico (1) , Matteo Zaccanti (1) , Marco Fattori (1) , Giacomo Roati (1) , Massimo Inguscio (1) , Giovanni Modugno (1) , Andrea Simoni (2)

1 LENS - European Laboratory for Non-Linear Spectroscopy
2 PALMS - Physique des atomes, lasers, molécules et surfaces

We discover several magnetic Feshbach resonances in collisions of ultracold 39K atoms, by studying atom losses and molecule formation. Accurate determination of the magnetic-field resonance locations allows us to optimize a quantum collision model for potassium isotopes. We employ the model to predict the magnetic-field dependence of scattering lengths and of near-threshold molecular levels. Our findings will be useful to plan future experiments on ultracold 39K atoms and molecules.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Chiara d'Errico, Matteo Zaccanti, Marco Fattori, Giacomo Roati, Massimo Inguscio, et al.. Feshbach resonances in ultracold 39K. New Journal of Physics, 2007, 9 (7), pp.223. ⟨10.1088/1367-2630/9/7/223⟩. ⟨hal-00908176⟩