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We have measured the precession frequency of a vortex lattice in aBose-Einstein condensate of 87Rb atoms. The observed mode corresponds to acollective motion in which all the vortices in the array are tilted by a smallangle with respect to the z-axis (the symmetry axis of the trapping potential)and synchronously rotate about this axis. This motion corresponds to excitationof a Kelvin wave along the core of each vortex and we have verified that it hasthe handedness expected for such helical waves, i.e. precession in the oppositesense to the rotational flow around the vortices. The experimental method usedto excite this collective mode closely resembles that used to study thescissors mode and excitation of the scissors mode for a condensate containing avortex array was used to determine the angular momentum of the system. Indeed,the collective tilting of the array that we have observed has previously beenreferred to as an `anomalous' scissors mode.Comment: 5 pages, 7 figures to be published in PR

Experimental Observation of the Tilting Mode of an Array of Vortices in a Dilute Bose-Einstein Condensate