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The quantum nucleation of phase slips in neutral superfluids confined in athin torus is investigated by means of the collective coordinate method. Wehave devised, with numerical justification, a certain collective coordinate todescribe the quantum nucleation process of a phase slip. Considering thequantum fluctuation around the local minimum of the action, we calculate theeffective mass of the phase slip. Due to the coherence of the condensatethroughout the torus, the effective mass is proportional to the circumference Lof the torus, and the decay rate has a strong exponential L-dependence.Comment: 4 pages, 2 figures, REVTe

Decay of Superflow Confined in Thin Torus: A Realization of Tunneling Quantum Fields