Volker D Burkert

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Introduction This document presents a summary of the scientific motivations for the 12 GeV Upgrade of the CEBAF facility at Jefferson Lab. It is based on the document originally prepared for the April 2005 DOE Science Review of the project, and incorporates relatively minor edits and updates. We will revise it more throughly following the discussions(More)
This experiment aims at a study of the spin-structure of the proton in the nucleon resonance region from low to moderately high values of Q 2. The EMC measurement of the polarized structure function g 1 (X) in the deep inelastic regime suggests that the integral over the difference of the helicity 1/2 and 3/2 total cross section behaves like: dυ υ υ thr ∞ ∫(More)
Time resolution of Burle 85001 micro-channel plate photo-multipliers in comparison with Hamamatsu R2083. Abstract The CLAS detector will require improvements in its particle identification system to take advantage of the higher energies provided by the Jefferson Laboratory accelerator upgrade to 12 GeV. To this end, we have studied the timing(More)
Nucleon structure is one of the most fundamental issues in nuclear physics. Elastic electron scattering provides detailed information about the electromagnetic structure of the nucleon. The differential cross section for elastic electron-nucleon scattering in the one-photon-exchange approximation is given by the Rosenbluth formula [1] in which the nucleon(More)
We propose to study Deep Virtual Compton Scattering (DVCS) using the CEBAF 6 GeV polarized electron beam and the CLAS detector at Jefferson Lab. The main focus of the experiment will be measurement of the beam spin asymmetry in the reaction ep → epγ. This asymmetry is directly proportional to the imaginary part of the DVCS amplitude and gives access to a(More)
A measurement of the electroproduction of photons off protons in the deeply inelastic regime was performed at Jefferson Lab using a nearly 6 GeV electron beam, a longitudinally polarized proton target, and the CEBAF Large Acceptance Spectrometer. Target-spin asymmetries for ep→e^{'}p^{'}γ events, which arise from the interference of the deeply virtual(More)
We are proposing a comprehensive program to map out the x-and Q 2-dependence of the helicity structure of the nucleon in the region of moderate to very large x where presently the experimental uncertainties are still large. The experiment will use the CLAS12 detector, 11 GeV highly polarized electron beam, and longitudinally polarized solid ammonia targets(More)
We report the first measurement of the transverse momentum dependence of double-spin asymmetries in semi-inclusive production of pions in deep-inelastic scattering off the longitudinally polarized proton. Data have been obtained using a polarized electron beam of 5.7 GeV with the CLAS detector at the Jefferson Lab (JLab). Modulations of single spin(More)