Publications [#303757] of John E. Thomas

Papers Published
  1. O'Hara, KM; Hemmer, SL; Granade, SR; Gehm, ME; Thomas, JE; Venturi, V; Tiesinga, E; Williams, CJ, Measurement of the Zero Crossing in a Feshbach Resonance of Fermionic 6-Li, vol. 66 (July, 2002), pp. 041401 [0207717v1], [doi] .

    We measure a zero crossing in the scattering length of a mixture of the two lowest hyperfine states of 6-Li. To locate the zero crossing, we monitor the decrease in temperature and atom number arising from evaporation in a CO2 laser trap as a function of magnetic field B. The temperature decrease and atom loss are minimized for B=528(4) G, consistent with no evaporation. We also present preliminary calculations using potentials that have been constrained by the measured zero crossing and locate a broad Feshbach resonance at approximately 860 G, in agreement with previous theoretical predictions. In addition, our theoretical model predicts a second and much narrower Feshbach resonance near 550 G.