We study experimentally the transverse monopole mode of an elongated rubidium condensate. Because of the scaling invariance of the nonlinear Schr\"odinger (Gross-Pitaevskii) equation, the oscillation is monochromatic and sinusoidal at short times, even under strong excitation. For ultralow temperatures, the quality factor Q0ex0ex=0ex0exω₀/γ₀ can exceed 2000, where ω₀ and γ₀ are the mode angular frequency and damping rate. This value is much larger than any previously reported for other eigenmodes of a condensate. We also present the temperature variation of ω₀ and γ₀.
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Chevy et al. (2002) studied this question.
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