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|Title:||Measurement of the Neutron Lifetime by Counting Trapped Protons in a Cold Neutron Beam|
|Authors:||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.|
|Citation:||PHYSICAL REVIEW C-NUCLEAR PHYSICS vol. 71 p. 055502-1 - 05502-27|
|Publisher:||AMERICAN PHYSICAL SOC|
|Type:||Articles in periodicals and books|
|Abstract:||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.|
|JRC Institute:||Institute for Reference Materials and Measurements|
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