Measurement of the Neutron Lifetime by Counting Trapped Protons.

Autor: Wietfeldt FE; Tulane University, New Orleans, LA 70118., Dewey MS; National Institute of Standards and Technology, Gaithersburg, MD 20899., Gilliam DM; National Institute of Standards and Technology, Gaithersburg, MD 20899., Nico JS; National Institute of Standards and Technology, Gaithersburg, MD 20899., Fei X; Indiana University, Bloomington, IN 47408., Snow WM; Indiana University, Bloomington, IN 47408., Greene GL; University of Tennessee/Oak Ridge National Laboratory, Knoxville, TN 37996., Pauwels J; European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, 2440 Geel, Belgium., Eykens R; European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, 2440 Geel, Belgium., Lamberty A; European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, 2440 Geel, Belgium., Van Gestel J; European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, 2440 Geel, Belgium.
Jazyk: angličtina
Zdroj: Journal of research of the National Institute of Standards and Technology [J Res Natl Inst Stand Technol] 2005 Aug 01; Vol. 110 (4), pp. 327-31. Date of Electronic Publication: 2005 Aug 01 (Print Publication: 2005).
DOI: 10.6028/jres.110.048
Abstrakt: We measured the neutron decay lifetime by counting in-beam neutron decay recoil protons trapped in a quasi-Penning trap. The absolute neutron beam fluence was measured by capture in a thin (6)LiF foil detector with known efficiency. The combination of these measurements gives the neutron lifetime: τ n = (886.8 ± 1.2 ± 3.2) s, where the first (second) uncertainty is statistical (systematic) in nature. This is the most precise neutron lifetime determination to date using an in-beam method.
Databáze: MEDLINE