Year: 1999
Type: article
Abstract: We have measured independently both $s$-wave and $p$-wave cross-dimensional thermalization rates for ultracold ${}^{40}\mathrm{K}$ atoms held in a magnetic trap. These measurements reveal that this fermionic isotope has a large positive $s$-wave triplet scattering length in addition to a low temperature $p$-wave shape resonance. We have measured directly the $p$-wave threshold law which, combined with the Fermi statistics, dramatically suppresses elastic collision rates at low temperatures. In addition, we present initial evaporative cooling results that make possible these collision measurements and are a precursor to achieving quantum degeneracy in this neutral, low-density Fermi system.
Source: Physical Review Letters
Authors: B. DeMarco, J. L. Bohn, J. P. Burke, M. Holland, D. S. Jin
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2048718109