1996/10/14 by The E142 Collaboration, P.L. Anthony, R. G. Arnold +47
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #Atomic and Subatomic Physics Research #Atomic physics #Deep inelastic scattering #Electron #Electron scattering #Inelastic neutron scattering #Inelastic scattering #Materials science #Neutron #Neutron scattering #Nuclear physics #Optics #Particle physics #Physics #Proton #Radiation Detection and Scintillator Technologies #Range (aeronautics) #Scattering #Spin (aerodynamics) #hep-ex
paper · pdf · doi:10.1103/physrevd.54.6620
published as Phys.Rev.D54:6620-6650,1996 · 97 pages, format is postscript file
arxiv created 1996/10/14 · openalex publication_date 1996/12/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
The neutron longitudinal and transverse asymmetries A1n and A2n have been extracted from deep inelastic scattering of polarized electrons by a polarized 3He target at incident energies of 19.42, 22.66, and 25.51 GeV. The measurement allows for the determination of the neutron spin structure functions g1n(x, Q2) and g2n(x, Q2) over the range 0.03<x<0.6 at an average Q2 of 2 (GeV/c)2. The data are used for the evaluation of the Ellis-Jaffe and Bjorken sum rules. The neutron spin structure function g1n(x, Q2) is small and negative within the range of our measurement, yielding an integral \ensuremath∫0.030.6g1n(x)dx=\ensuremath-0.028\ifmmode±\else\textpm\fi0.006 (stat)\ifmmode±\else\textpm\fi0.006 (syst). Assuming Regge behavior at low x, we extract \ensuremathΓ1n=\ensuremath∫01g1n(x)dx=\ensuremath-0.031\ifmmode±\else\textpm\fi0.006 (stat)\ifmmode±\else\textpm\fi0.009 (syst). Combined with previous proton integral results from SLAC experiment E143, we find \ensuremathΓ1p\ensuremath-\ensuremathΓ1n=0.160\ifmmode±\else\textpm\fi0.015 in agreement with the Bjorken sum rule prediction \ensuremathΓ1p\ensuremath-\ensuremathΓ1n=0.176\ifmmode±\else\textpm\fi0.008 at a Q2 value of 3 (GeV/c)2 evaluated using \ensuremathαs=0.32\ifmmode±\else\textpm\fi0.05.