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arXiv physics/0207098physics.atom-ph
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磁场对费米锂原子冷气体弹性散射的控制

Magnetic field control of elastic scattering in a cold gas of fermionic lithium atoms

S. Jochim, M. Bartenstein, G. Hendl, J. Hecker Denschlag, R. Grimm, A. Mosk, M. Weidemüller

摘要:

通过测量蒸发损耗,研究了在高达1.5kG的磁场作用下,光阱自旋混合费米锂原子的弹性碰撞。我们的实验证实了预期的磁性可调性的散射长度显示的弹性散射的主要特点,根据最近的计算。我们在530(3)G测量了与预测的费什巴赫共振相关的散射长度的零交叉。除了共振,我们观察到预期的大截面的三重散射制度。

英文摘要:

We study elastic collisions in an optically trapped spin mixture of fermionic lithium atoms in the presence of magnetic fields up to 1.5kG by measuring evaporative loss. Our experiments confirm the expected magnetic tunability of the scattering length by showing the main features of elastic scattering according to recent calculations. We measure the zero crossing of the scattering length that is associated with a predicted Feshbach resonance at 530(3)G. Beyond the resonance we observe the expected large cross section in the triplet scattering regime.

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