We have combined results of our observation of shape resonances in ^85Rb and ^87Rb, the JILA experiment realizing two coexisting Bose condensates in ^87Rb, and our cold-atom optical double resonance observation of the least-bound ^85Rb2 states(R.S. Freeland, C.C. Tsai, J.M. Vogels, D.J. Heinzen, and B.J. Verhaar (to be published)), to describe the collisions of cold Rb atoms with unprecedented accuracy. This enables us(J.M. Vogels, C.C. Tsai, R.S. Freeland, S.J.J.M.F. Kokkelmans, B.J. Verhaar, and D.J. Heinzen (to be published)) to predict B-field induced Feshbach resonances, thus making it possible to control the sign and magnitude of the effective particle-particle interaction in a Bose condensate by tuning a bias magnetic field. For a gas of ^85Rb atoms they are found to occur in the low-field seeking B-range. For ^87Rb we predict them to occur at negative field values.
|Publication status||Published - 1 Apr 1997|
|Event||1997 Joint APS/AAPT Meeting, April 18-21, 1997, Washington, DC. - Washington, DC, United States|
Duration: 18 Apr 1997 → 21 Apr 1997
|Conference||1997 Joint APS/AAPT Meeting, April 18-21, 1997, Washington, DC.|
|Period||18/04/97 → 21/04/97|