CLAS Physics Database

E5

Spokesperson
W. K. Brooks and M. F. Vineyard
Year
2000
Abstract
The neutron elastic magnetic form factor $G_M^n$ has been extracted from quasielastic electron scattering data on deuterium with CLAS. The kinematic coverage of the measurement is continuous from $Q^2$=1~$\rm{GeV^2}$ to 4.8~$\rm{GeV^2}$. High precision was achieved by employing a ratio technique in which many uncertainties cancel, and by a simultaneous in-situ calibration of the neutron detection efficiency, the largest correction to the data. Neutrons were detected using the CLAS electromagnetic calorimeters and the time-of-flight scintillators. Data were taken at two different electron beam energies, allowing up to four semi-independent measurements of $G_M^n$ to be made at each value of $ Q^2$. The dipole parameterization is found to provide a good description of the data over the measured $Q^2$ range.
Comment
Data analysis done by J.D. Lachniet, a student at CMU.
Publication
  1. J.Lachniet, A.Afanasev, H.Arenh?vel, W.K.Brooks, G.P.Gilfoyle, S.Jeschonnek, B.Quinn, M.F.Vineyard, et al (the CLAS Collaboration) A Precise Measurement of the Neutron Magnetic Form Factor GMn in the Few-GeV2 Region // PRL 102, 192001 (2009)
Quantities
GMnreduced

Measurements

ID Quantity Beam Target Final state Q2min,
GeV2
Q2max,
GeV2
Wmin,
GeV
Wmax,
GeV
E111M1 GMnreduced e d p n 0.9848 4.7727 0.0 1.095445115