We report on the first measurement of the F2 structure function of the neutron from the semi-inclusive scattering of electrons from deuterium, with low-momentum protons detected in the back-ward hemisphere. Restricting the momentum of the spectator protons to 100 MeV/c and their angles to 100◦ relative to the momentum transfer allows an interpretation of the process in terms of scattering from nearly on-shell neutrons. The Fn2 data collected cover the nucleon-resonance and deep-inelastic regions over a wide range of Bjorkenx for 0.65< Q2<4.52 GeV2, with uncertainties from nuclear corrections estimated to be less than a few percent. These measurements provide the first determination of the neutron to proton structure function ratio Fn2/Fp2 at 0.2.x.0.8 with little uncertainty due to nuclear effects.
Measurement of the Neutron F-2 Structure Function via Spectator Tagging with CLAS
CONTALBRIGO, Marco;PAPPALARDO, Luciano Libero;
2012
Abstract
We report on the first measurement of the F2 structure function of the neutron from the semi-inclusive scattering of electrons from deuterium, with low-momentum protons detected in the back-ward hemisphere. Restricting the momentum of the spectator protons to 100 MeV/c and their angles to 100◦ relative to the momentum transfer allows an interpretation of the process in terms of scattering from nearly on-shell neutrons. The Fn2 data collected cover the nucleon-resonance and deep-inelastic regions over a wide range of Bjorkenx for 0.65< Q2<4.52 GeV2, with uncertainties from nuclear corrections estimated to be less than a few percent. These measurements provide the first determination of the neutron to proton structure function ratio Fn2/Fp2 at 0.2.x.0.8 with little uncertainty due to nuclear effects.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
