| Autor: |
Rem, B. S., Grier, A. T., Ferrier-Barbut, I., Eismann, U., Langen, T., Navon, N., Khaykovich, L., Werner, F., Petrov, D. S., Chevy, F., Salomon, C. |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
Phys. Rev. Lett. 110, 163202 (2013) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.110.163202 |
| Popis: |
We study the lifetime of a Bose gas at and around unitarity using a Feshbach resonance in lithium~7. At unitarity, we measure the temperature dependence of the three-body decay coefficient $L_{3}$. Our data follow a $L_3 {=} \lambda_{3} / T^{2}$ law with $\lambda_{3} = 2.5(3)_{stat}_(6)_{sys} 10^{-20} (\mu K)^2 cm^6 s^{-1}$ and are in good agreement with our analytical result based on the zero-range theory. Varying the scattering length $a$ at fixed temperature, we investigate the crossover between the finite-temperature unitary region and the previously studied regime where $|a|$ is smaller than the thermal wavelength. We find that $L_{3}$ is continuous across resonance, and over the whole $a {<} 0$ range our data quantitatively agree with our calculation. |
| Databáze: |
arXiv |
| Externí odkaz: |
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