The neutron charge form factor G En (q) is determined from an analysis of the deuteron quadrupole form factor F C2 (q) data. Recent calculations, based on a variety of different model interactions and currents, indicate that the contributions associated with the uncertain two-body operators of shorter range are relatively small for F C2 (q), even at large… (More)
We have built a polarimeter in order to measure the electron beam polarization in hall C at JLAB. Using a superconducting solenoid to drive the pure-iron target foil into saturation, and a symmetrical setup to detect the Møller electrons in coincidence, we achieve an accuracy of <1%. This sets a new standard for Møller polarimeters.
BACKGROUND Pyoderma gangrenosum (PG) is a rarely diagnosed ulcerative neutrophilic dermatosis with unknown origin that has been poorly characterized in clinical studies so far. Consequently there have been significant discussions about its associated factors and comorbidities. The aim of our multicenter study was to analyze current data from patients in… (More)
In order to achieve better accuracy on the measurement of electron beam polarization employing e'-e' scattering, we have developed an improved polarized electron target. Using a pure iron foil saturated out-of-plane in a 4 T magnetic field one can reduce the systematical errors to the promille level. Measurement of the relative target polarization using… (More)
We propose to extend our previous measurements of G n E from deuterium to Q 2 = 6.88 (GeV/c) 2. Additional measurements at 5.22, 3.95, and 2.18 (GeV/c) 2 will provide continuity with our prior measurements up to Q 2 = 1.45 (GeV/c) 2 , and overlap with recent (unpublished) measurements from a polarized 3 He target. The JLab E93-038 collaboration measured G n… (More)
Ground-state hyperfine splittings in hydrogen and muonium are very well measured. Their difference, after correcting for magnetic moment and reduced mass effects, is due solely to proton structure-the large QED contributions for a pointlike nucleus essentially cancel. The rescaled hyperfine difference depends on the Zemach radius, a fundamental measure of… (More)
We have carried out an (e,e'p) experiment at high momentum transfer and in parallel kinematics to measure the strength of the nuclear spectral function S(k,E) at high nucleon momenta k and large removal energies E. This strength is related to the presence of short-range and tensor correlations, and was known hitherto only indirectly and with considerable… (More)