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Now showing items 1 - 2 of 2

  • High precision measurement of Compton scattering in the 5 GeV region

    Ambrozewicz, P.   Ye, L.   Prok, Y.   Larin, I   Ahmidouch, A.   Baker, K.   Baturin, V   Benton, L.   Bernstein, A.   Burkert, V   Clinton, E.   Cole, P. L.   Collins, P.   Dale, D.   Danagoulian, S.   Davidenko, G.   Demirchyan, R.   Deur, A.   Dolgolenko, A.   Dutta, D.   Dzyubenko, G.   Evdokimov, A.   Fedotov, G.   Feng, J.   Gabrielyan, M.   Gan, L.   Gao, H.   Gasparian, A.   Gevorkyan, N.   Gevorkyan, S.   Glamazdin, A.   Goryachev, V   Guo, L.   Gyurjyan, V   Hardy, K.   He, J.   Isupov, E.   Ito, M. M.   Jiang, L.   Kang, H.   Kashy, D.   Khandaker, M.   Kingsberry, P.   Klein, F.   Kolarkar, A.   Konchatnyi, M.   Korchin, O.   Korsch, W.   Kosinov, O.   Kowalski, S.   Kubantsev, M.   Kubarovsky, A.   Kubarovsky, V   Lawrence, D.   Li, X.   Levillain, M.   Lu, H.   Ma, L.   Martel, P.   Matveev, V   McNulty, D.   Mecking, B.   Micherdzinska, A.   Milbrath, B.   Minehart, R.   Miskimen, R.   Mochalov, V   Morrison, B.   Mtingwa, S.   Nakagawa, I   Overby, S.   Pasyuk, E.   Payen, M.   Park, K.   Pedroni, R.   Phelps, W.   Protopopescu, D.   Rimal, D.   Ritchie, B. G.   Romanov, D.   Salgado, C.   Shahinyan, A.   Sitnikov, A.   Sober, D.   Stepanyan, S.   Stephens, W.   Tarasov, V   Taylor, S.   Teymurazyan, A.   Underwood, J.   Vasiliev, A.   Vishnyakov, V.   Weygand, D. P.   Wood, M.   Zhang, Y.   Zhou, S.   Zihlmann, B.  

    The cross section of atomic electron Compton scattering gamma + e -> gamma' + e' was measured in the 4.400-5.475 GeV photon beam energy region by the PrimEx collaboration at Jefferson Lab with an accuracy of 2.6% and less. The results are consistent with theoretical predictions that include next-to-leading order radiative corrections. The measurements provide the first high precision test of this elementary QED process at beam energies greater than 0.1 GeV. (C) 2019 The Author(s). Published by Elsevier B.V.
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  • Nuclear targets for a precision measurement of the neutral pion radiative width

    Martel, P.   Clinton, E.   McWilliams, R.   Lawrence, D.   Miskimen, R.   Ahmidouch, A.   Ambrozewicz, P.   Asratyan, A.   Baker, K.   Benton, L.   Bernstein, A.   Cole, P.   Collins, P.   Dale, D.   Danagoulian, S.   Davidenko, G.   Demirchyan, R.   Deur, A.   Dolgolenko, A.   Dzyubenko, G.   Evdokimov, A.   Feng, J.   Gabrielyan, M.   Gan, L.   Gasparian, A.   Glamazdin, O.   Goryachev, V.   Gyurjyan, V.   Hardy, K.   Ito, M.   Khandaker, M.   Kingsberry, P.   Kolarkar, A.   Konchatnyi, M.   Korchin, O.   Korsch, W.   Kowalski, S.   Kubantsev, M.   Kubarovsky, V.   Larin, I.   Matveev, V.   McNulty, D.   Milbrath, B.   Minehart, R.   Mochalov, V.   Mtingwa, S.   Nakagawa, I.   Overby, S.   Pasyuk, E.   Payen, M.   Pedroni, R.   Prok, Y.   Ritchie, B.   Salgado, C.   Sitnikov, A.   Sober, D.   Stephens, W.   Teymurazyan, A.   Underwood, J.   Vasiliev, A.   Verebryusov, V.   Vishnyakov, V.   Wood, M.  

    A technique is presented for precision measurements of the area densities, rho T, of approximately 5% radiation length carbon and (208)Pb targets used in an experiment at Jefferson Laboratory to measure the neutral pion radiative width. The precision obtained in the area density for the carbon target is +/- 0.050%, and that obtained for the lead target through an X-ray attenuation technique is +/- 0.43%. (C) 2009 Elsevier B.V. All rights reserved.
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