Physics
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Item Momentum transfer dependence of nuclear transparency from the quasielastic 12C(e,e’p) reaction(1994-03) Makins, N.C.R.; Ent, R.; Chapman, M.S.; Hansen, J.-O.; Lee, K.; Milner, R.G.; Nelson, J.; Bosted, P.E.; Keppel, C.E.; Lung, A.; Rock, S.E.; Spengos, M.; Szalata, Z.M.; Tao, L.H.; White, J.L.; Coulter, K.P.; Geesaman, D.F.; Holt, R.J.; Jackson, H.E.; Papavassiliou, V.; Potterveld, D.H.; Zeidman, B.; Arrington, J.; Beise, E.J.; Belz, E.; Filippone, B.W.; Gao, H.; Lorenzon, W.; Mueller, B.; McKeown, R.D.; O'Neill, T.G.; Epstein, M.; Margaziotis, D.J.; Napolitano, J.; Anthony, P.L.; van Bibber, K.; Dietrich, F.S.; Gearhart, R.A.; Petratos, G.G.; Kuhn, S.E.The cross section for quasielastic 12C(e,e’p) scattering has been measured at momentum transfer Q2=1, 3, 5, and 6.8 (GeV/c)2. 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 rise of the transparency with Q2 is observed.Item Evidence for virtual Compton scattering from the proton(1995-11) van der Brand, J.F.J.; Ent, R.; Anthony, P.L.; Arnold, R.G.; Arrington, J.; Beise, E.J.; Belz, J.E.; Bosted, P.E.; Bulten, H.-J.; Chapman, M.S.; Coulter, K.P.; Dietrich, F.S.; Epstein, M.; Filippone, B.W.; Gao, H.; Gearheat, R.A.; Geesaman, D.F.; Hansen, J.-O.; Holt, R.J.; Jackson, H.E.; Jones, C.E.; Margaziotis, D.J.; McKeown, R.D.; Milner, R.G.; Mueller, B.; Napolitano, J.; Nelson, J.; Keppel, C.E.; Kinney, R.D.; Kuhn, S.; Lee, K.; Lorenzon, W.; Lung, A.; Makins, N.C.R.; O'Neill, T.G.; Papavassiliou, V.; Petratos, G.; Potterveld, D.H.; Rock, S.E.; Spengos, M.; Szalata, Z.M.; Tao, L.H.; van Bibber, K.; Wasson, D.A.; White, J.L.; Zeidman, B.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 described by a calculation that includes the coherent sum of electron and proton radiation.