Journal
PHYSICAL REVIEW LETTERS
Volume 91, Issue 15, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.91.152302
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We report a new measurement of the neutron decay lifetime by the absolute counting of in-beam neutrons and their decay protons. Protons were confined in a quasi-Penning trap and counted with a silicon detector. The neutron beam fluence was measured by capture in a thin (LiF)-Li-6 foil detector with known absolute efficiency. The combination of these simultaneous measurements gives the neutron lifetime: tau(n)=(886.8+/-1.2[stat]+/-3.2[syst]) s. The systematic uncertainty is dominated by uncertainties in the mass of the (LiF)-Li-6 deposit and the Li-6(n,t) cross section. This is the most precise measurement of the neutron lifetime to date using an in-beam method.
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