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The UCN$\tau$ experiment is designed to measure the lifetime $\tau_{n}$ ofthe free neutron by trapping ultracold neutrons (UCN) in amagneto-gravitational trap. An asymmetric bowl-shaped NdFeB magnet Halbacharray confines low-field-seeking UCN within the apparatus, and a set ofelectromagnetic coils in a toroidal geometry provide a background "holding"field to eliminate depolarization-induced UCN loss caused by magnetic fieldnodes. We present a measurement of the storage time $\tau_{store}$ of the trapby storing UCN for various times, and counting the survivors. The data areconsistent with a single exponential decay, and we find $\tau_{store}=860\pm19$s: within $1 \sigma$ of current global averages for $\tau_{n}$. The storagetime with the holding field deactiveated is found to be $\tau_{store}=470 \pm160$ s; this decreased storage time is due to the loss of UCN which undergoMajorana spin-flips while being stored. We discuss plans to increase thestatistical sensitivity of the measurement and investigate potential systematiceffects.

Storage of ultracold neutrons in the UCN$\tau$ magneto-gravitational trap