Franz Wesselmann

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We have measured the nuclear transparency of the A(e,e'pi+) process in 2H, 12C, 27Al, 63Cu, and 197Au targets. These measurements were performed at the Jefferson Laboratory over a four momentum transfer squared range Q2=1.1 to 4.7 (GeV/c)2. The nuclear transparency was extracted as the super-ratio of (sigmaA/sigmaH) from data to a model of(More)
We present a Next-to-Leading order perturbative QCD analysis of world data on the spin dependent structure functions g p 1 , g n 1 , and g d 1 , including the new experimental information on the Q 2 dependence of g n 1. Careful attention is paid to the experimental and theoretical uncertainties. The data constrain the first moments of the polarized valence(More)
We have examined the spin structure of the proton in the region of the nucleon resonances (1.085 GeV<W<1.910 GeV) at an average four momentum transfer of Q2=1.3 GeV2. Using the Jefferson Lab polarized electron beam, a spectrometer, and a polarized solid target, we measured the asymmetries A|| and A(perpendicular) to high precision, and extracted the(More)
We propose to make definitive measurements of the deuteron spin structure function g d 1 /F d 1 in the deep-inelastic kinematics accessible with a 6 GeV beam at JLab. The principal goal is to provide the low Q 2 anchor points for NLO pQCD plus higher twist fits to g d 1 /F d 1 , which is particularly sensitive to ∆G(x) (the polarized gluon density of the(More)
New Jefferson Lab data are presented on the nuclear dependence of the inclusive cross section from (2)H, (3)He, (4)He, (9)Be and (12)C for 0.3 < x < 0.9, Q(2) approximately 3-6 GeV(2). These data represent the first measurement of the EMC effect for (3)He at large x and a significant improvement for (4)He. The data do not support previous A-dependent or(More)