Measurement of p-wave threshold law using evaporatively cooled fermionic atoms

B. De Marco, J. L. Bohn, J. P. Burke, M. Holland, D. S. Jin

Research output: Contribution to journalArticlepeer-review


We have measured independently both s-wave and p-wave cross-dimensional thermalization rates for ultracold 40K 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.

Original languageEnglish (US)
Pages (from-to)4208-4211
Number of pages4
JournalPhysical review letters
Issue number21
StatePublished - 1999
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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