A measurement of the neutron lifetime Tn performed by the absolute clounting of in-beam neutrons and their decay protons has been completed. Protons confined in a quasi-Penning trap were accelerated onto a silicon detector held a a high potential and counted with nearly unit efficiency. The neutrons were counted by a device with an efficiency inversely proportional to neutron velocity, which cancels the dwell time of the neutron beam in trap. The result is Tn=(886.3 +/- 1.2 [stat] +/- 3.2 [sys])s, which is the most precise measurement of the lifetime using an in-beam method. The systematic technique and apparatus, data analysis, and investigation of systematic uncertainties are discussed in detail.
NICO J.S.;
DEWEY M.S.;
GILLIAM D.M.;
WIETFELDT F.E.;
FEI X.;
SNOW W.M.;
GREENE G.L.;
PAUWELS Jean;
EYKENS Roger;
LAMBERTY Andree;
VAN GESTEL Jozef;
SCOTT R.D.;
2005-12-20
AMERICAN PHYSICAL SOC
JRC30511
https://publications.jrc.ec.europa.eu/repository/handle/JRC30511,
10.1103/PhysRevC.71.055502,
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