Determination of the s-wave scattering length of chromium.
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.
Schmidt
P O
PO
5. Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart, Germany.
Hensler
S
S
Werner
J
J
Griesmaier
A
A
Görlitz
A
A
Pfau
T
T
Simoni
A
A