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VOLUME 107 | ISSUE 11 | PAGE 707
Measurement of the neutron lifetime with ultra-cold neutrons stored in a magneto-gravitational trap
Abstract
We report a measurement of the neutron lifetime using ultra-cold neutrons stored in a magneto-gravitational trap made of permanent magnets. Neutrons surviving in the trap after fixed storage times have been counted and the trap losses have continuously been monitored during storage by detecting neutrons leaking from the trap. The value of the neutron lifetime resulting from this measurement is \tau_n = (878.3\pm 1.6_{\text{stat}}\pm 1.0_{\text{syst}}) s. A unique feature of this experiment is the monitoring of leaking neutrons providing a robust control of the main systematic loss.