| Autor: |
Roy, Sanjukta, Landini, Manuele, Trenkwalder, Andreas, Semeghini, Giulia, Spagnolli, Giacomo, Simoni, Andrea, Fattori, Marco, Inguscio, Massimo, Modugno, Giovanni |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. Lett. 111, 053202 (2013) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.111.053202 |
| Popis: |
We measure the critical scattering length for the appearance of the first three-body bound state, or Efimov three-body parameter, at seven different Feshbach resonances in ultracold 39K atoms. We study both intermediate and narrow resonances, where the three-body spectrum is expected to be determined by the non-universal coupling of two scattering channels. We observe instead approximately the same universal relation of the three-body parameter with the two-body van der Waals radius already found for broader resonances, which can be modeled with a single channel. This unexpected observation suggests the presence of a new regime for three-body scattering at narrow resonances. |
| Databáze: |
arXiv |
| Externí odkaz: |
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