title: Determination of the s-wave scattering length of chromium.
abstract: We have measured the deca-triplet s-wave scattering length of the bosonic chromium isotopes 52Cr and 50Cr. From the time constants for cross-dimensional thermalization in ultracold atomic samples, we have determined the magnitudes |a(52Cr)|=(170+/-39)a(0) and |a(50Cr)|=(40+/-15)a(0), where a(0)=0.053 nm. By measuring the rethermalization rate of 52Cr over a wide temperature range and comparing the temperature dependence with the effective-range theory and numerical single-channel calculations, we have obtained strong evidence that the sign of a(52Cr) is positive. Rescaling our 52Cr model potential to 50Cr strongly suggests that a(50Cr) is positive also.
authors: 5. Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart, Germany.
authors: P O
authors: PO
authors: Schmidt
authors: S
authors: S
authors: Hensler
authors: J
authors: J
authors: Werner
authors: A
authors: A
authors: Griesmaier
authors: A
authors: A
authors: Görlitz
authors: T
authors: T
authors: Pfau
authors: A
authors: A
authors: Simoni