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 JeanEYKENS ROGERLAMBERTY ANDREEVAN GESTEL JozefSCOTT R.d.
Citation: PHYSICAL REVIEW C-NUCLEAR PHYSICS vol. 71 p. 055502-1 - 05502-27
Publisher: AMERICAN PHYSICAL SOC
Publication Year: 2005
JRC N°: JRC30511
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC30511
Type: Articles in Journals
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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