Keith Griffioen
Professor of Physics
Department of Physics
College of William and Mary
P.O. Box 8795
Williamsburg, VA 23187-8795
Office Phone: 757-221-3537
Fax: 757-221-3540

Ever since the discovery of the quark, high-energy lepton scattering experiments have provided increasingly more accurate data on the structure of neutrons and protons (nucleons). Our present knowledge is extensive but incomplete. One of the currently interesting topics of research focuses on how the quark-antiquark sea, and the gluons that mediate the strong interaction, influence nucleon and nuclear structure. I am presently involved in experiments designed to understand this. Several experiments have been done over the past decade at the Stanford Linear Accelerator Center, including E143, E154, and E155, which have measured polarized deep-inelastic scattering. They indicate that the spin of the neutron or proton does not come predominately from the quarks. A set of follow-up measurements at SLAC using a polarized beam of high-energy photons, E159, E160, and E161, has been planned but never executed. My current research centers on Jefferson Lab in Newport News, VA (near William and Mary) and uses the CLAS (the CEBAF Large Acceptance Spectrometer). Experiments include BoNuS, E6 and EG1. The Spin Group at William and Mary (Armstrong, Averett, Carlini, Finn, Griffioen and Lung) is heavily involved in the G0 Experiment and the Qweak Experiment in Hall C at Jefferson Lab, which study the proton and neutron through parity-violating electron scattering. Plans are currently underway to double the energy at Jefferson Lab, which will allow us to explore the nucleon with much finer detail.

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