C E Keppel

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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)
The neutron longitudinal and transverse asymmetries A n 1 and A n 2 have been extracted from deep inelas-tic scattering of polarized electrons by a polarized 3 He target at incident energies of 19.42, 22.66 and 25.51 GeV. The measurement allows for the determination of the neutron spin structure functions g n 1 (x; Q 2) and g n 2 (x; Q 2) over the range(More)
The NuMI facility at Fermilab will provide an extremely intense beam of neutrinos for the MINOS neutrino-oscillation experiment. The spacious and fully-outfitted MINOS near detector hall will be the ideal venue for a high-statistics, high-resolution ν and ν–nucleon/nucleus scattering experiment. The experiment described here will measure neutrino(More)
The inclusive A(e,eЈ) cross section for xӍ1 was measured on 2 H, C, Fe, and Au for momentum transfers Q 2 from 1 to 6.8 ͑GeV/c) 2. 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(More)
  • S Zhou, X Li, H Gao, X Qian, X F Zhu, P Markowitz +53 others
  • 2006
We propose here precision measurements of the neutron spin asymmetry A n 1 in the deep inelastic scattering region 0.3 < x < 0.77 and 3 < Q 2 < 10 (GeV/c) 2. We plan to use a polarized 3 He target in Hall C, together with the high momentum spectrometer (HMS) and the planned Super HMS (SHMS). The wide Q 2 span of this measurement will explore possible Q(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)
In virtual Compton scattering an electron is scattered off a nucleon such that the nucleon emits a photon. We show that these events can be selected experimentally, and present the first evidence for virtual Compton scattering from the proton in data obtained at the Stanford Linear Accelerator Center. The angular and energy dependence of the data is well(More)
  • N C R Makins, R Ent, M S Chapman, J Hansen, K Lee, R G Milner +40 others
  • 2010
The cross section for quasielastic 12C(e, e'p) scattering has been measured at momentum transfer Q~ = 1, 3, 5 , and 6.8 (Gev/c)'. The results are consistent with scattering from a single nucleon as the dominant process. The nuclear transparency is obtained and compared with theoretical calculations that incorporate color transparency effects. No significant(More)