33 research outputs found
Inclusive Electron Scattering from Nuclei at
The inclusive A(e,e') cross section for was measured on H,
C, Fe, and Au for momentum transfers from 1-7 (GeV/c). The scaling
behavior of the data was examined in the region of transition from y-scaling to
x-scaling. Throughout this transitional region, the data exhibit -scaling,
reminiscent of the Bloom-Gilman duality seen in free nucleon scattering.Comment: 4 pages, RevTeX; 4 figures (postscript in .tar.Z file
Precision Determination of the Neutron Spin Structure Function g1n
We report on a precision measurement of the neutron spin structure function
using deep inelastic scattering of polarized electrons by polarized
^3He. For the kinematic range 0.014<x<0.7 and 1 (GeV/c)^2< Q^2< 17 (GeV/c)^2,
we obtain at an average . We find relatively large negative
values for at low . The results call into question the usual Regge
theory method for extrapolating to x=0 to find the full neutron integral
, needed for testing quark-parton model and QCD sum rules.Comment: 5 pages, 3 figures To be published in Phys. Rev. Let
Measurements of the Delta(1232) Transition Form Factor and the Ratio sigma_n\sigma_p From Inelastic Electron-Proton and Electron-Deuteron Scattering
Measurements of inclusive electron-scattering cross sections using hydrogen
and deuterium targets in the region of the Delta(1232) resonance are reported.
A global fit to these new data and previous data in the resonance region is
also reported for the proton. Transition form factors have been extracted from
the proton cross sections for this experiment over the four-momentum transfer
squared range 1.64 < Q^2 < 6.75 (GeV/c)^2 and from previous data over the range
2.41 < Q^2 < 9.82 (GeV/c)^2. The results confirm previous reports that the
Delta(1232) transition form factor decreases more rapidly with Q^2 than
expected from perturbative QCD. The ratio of sigma _n \sigma_p in the
\Delta(1232) resonance region has been extracted from the deuteron data for
this experiment in the range 1.64 < Q^2 < 3.75 (GeV/c)^2 and for a previous
experiment in the range 2.4 < Q^2 < 7.9 (GeV/c)^2. A study has been made of the
model dependence of these results. This ratio sigma_n\sigma_p for \Delta(1232)
production is slightly less than unity, while sigma_n\sigma_p for the
nonresonant cross sections is approximately 0.5, which is consistent with deep
inelastic scattering results.Comment: 10 figures. 42 pages, including figures. submitted to Physical Review