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We have observed Feshbach resonances in elastic collisions between ultracold${}^{52}$Cr atoms. This is the first observation of collisional Feshbachresonances in an atomic species with more than one valence electron. The zeronuclear spin of ${}^{52}$Cr and thus the absence of a Fermi-contact interactionleads to regularly-spaced resonance sequences. By comparing resonance positionswith multi-channel scattering calculations we determine the s-wave scatteringlength of the lowest $^{2S+1}\Sigma_{g}^{+}$ potentials to be$\unit[112(14)]{a_0}$, $\unit[58(6)]{a_0}$ and $-\unit[7(20)]{a_0}$ for S=6, 4,and 2, respectively, where $a_{0}=\unit[0.0529]{nm}$.Comment: 4 pages, 2 figures, 1 tabl

physical review letters

Observation of Feshbach Resonances in an Ultracold Gas of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Cr</mml:mi><mml:mprescripts /><mml:none /><mml:mn>52</mml:mn></mml:mmultiscripts></mml:math>

Observation of Feshbach Resonances in an Ultracold Gas ofCr52