Quantum tunneling was observed in the decay of metastable spin domains in gaseous Bose-Einstein condensates. A mean-field description of the tunneling was developed and compared with measurement. The tunneling rates are a sensitive probe of the boundary between spin domains, and indicate a spin structure which is prohibited in the bulk fluid. These experiments were performed with optically trapped F0ex0ex=0ex0ex1 spinor Bose-Einstein condensates of sodium.
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Stamper-Kurn et al. (1999) studied this question.
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