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Now showing items 1 - 14 of 14

  • Revealing Color Forces with Transverse Polarized Electron Scattering

    Armstrong, W.   Kang, H.   Liyanage, A.   Maxwell, J.   Mulholland, J.   Ndukum, L.   Ahmidouch, A.   Albayrak, I.   Asaturyan, A.   Ates, O.   Baghdasaryan, H.   Boeglin, W.   Bosted, P.   Brash, E.   Butuceanu, C.   Bychkov, M.   Carter, P.   Chen, C.   Chen, J.-P.   Choi, S.   Christy, M. E.   Covrig, S.   Crabb, D.   Danagoulian, S.   Daniel, A.   Davidenko, A. M.   Davis, B.   Day, D.   Deconinck, W.   Deur, A.   Dunne, J.   Dutta, D.   El Fassi, L.   Ellis, C.   Ent, R.   Flay, D.   Frlez, E.   Gaskell, D.   Geagla, O.   German, J.   Gilman, R.   Gogami, T.   Gomez, J.   Goncharenko, Y. M.   Hashimoto, O.   Higinbotham, D.   Horn, T.   Huber, G. M.   Jones, M.   Jones, M. K.   Kalantarians, N.   Kang, H-K.   Kawama, D.   Keith, C.   Keppel, C.   Khandaker, M.   Kim, Y.   King, P. M.   Kohl, M.   Kovacs, K.   Kubarovsky, V.   Li, Y.   Liyanage, N.   Luo, W.   Mack, D.   Mamyan, V.   Markowitz, P.   Maruta, T.   Meekins, D.   Melnik, Y. M.   Meziani, Z.-E.   Mkrtchyan, A.   Mkrtchyan, H.   Mochalov, V. V.   Monaghan, P.   Narayan, A.   Nakamura, S. N.   Nuruzzaman, A.   Pentchev, L.   Pocanic, D.   Posik, M.   Puckett, A.   Qiu, X.   Reinhold, J.   Riordan, S.   Roche, J.   Rondón, O. A.   Sawatzky, B.   Shabestari, M.   Slifer, K.   Smith, G.   Soloviev, L. F.   Solvignon, P.   Tadevosyan, V.   Tang, L.   Vasiliev, A. N.   Veilleux, M.   Walton, T.   Wesselmann, F.   Wood, S.   Yao, H.   Ye, Z.   Zhang, J.   Zhu, L.  

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  • Charge-exchange pp → nn differential cross-sections between 546 and 1287 MeV/c

    Ahmidouch, A.   Heer, E.   Hess, R.   Lechanoine-Leluc, C.   Mascarini, Ch.   Rapin, D.   Birsa, R.   et. al.  

    The differential cross section of the charge-exchange reaction pp → nn has been measured at the CERN Low Energy Antiproton Ring (LEAR) at seven p momenta in the range 546-1287 MeV/c. A pentanol polarized target has been used and the neutron and the antineutron have been detected in coincidence. The data cover most of the angular range.
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  • Spectroscopic investigation of Lambda hypernuclei in the wide mass region using the (e,e'K(+)) reaction

    Nakamura, Satoshi N.   Achenbach, P.   Ahmidouch, A.   Albayrak, I.   Androic, D.   Asaturyan, A.   Asaturyan, R.   Ates, O.   Badui, R.   Baturin, P.   Boeglin, W.   Bono, J.   Bosted, P.   Brash, E.   Carter, P.   Chen, C.   Chiba, A.   Christy, M.   Dalton, M.   Danagoulian, S.   De Leo, R.   Doi, D.   Egiyan, K.   Elaasar, M.   Ent, R.   Fenker, H.   Fujii, Y.   Furic, M.   Gabrielyan, M.   Gan, L.   Garibaldi, F.   Gaskell, D.   Gasparian, A.   Gogami, T.   Hashimoto, O.   Horn, T.   Hu, B.   Jones, M.   Kanda, H.   Kaneta, M.   Kato, S.   Kawai, M.   Kawama, D.   Khanal, H.   Kohl, M.   Liyanage, A.   Luo, W.   Mack, D.   Maeda, K.   Margaryan, A.   Marikyan, G.   Markowitz, P.   Maruta, T.   Matsumura, A.   Maxwell, V.   Mkrtchyan, A.   Mkrtchyan, H.   Nagao, S.   Nakamura, S. N.   Narayan, A.   Navasardyan, T.   Neville, C.   Niculescu, G.   Niculescu, M. -I.   Nunez, A.   Nuruzzaman   Okayasu, Y.   Petkovic, T.   Pochodzalla, J.   Qiu, X.   Reinhold, J.   Rodriguez, V.   Samanta, C.   Sawatzky, B.   Schott, D.   Seva, T.   Shichijo, A.   Smith, G.   Tadevosyan, V.   Tamura, H.   Tang, L.   Taniya, N.   Tvaskis, V.   Veilleux, M.   Vulcan, W.   Wesselmann, F. R.   Wood, S. A.   Yamamoto, T.   Ya, L.   Ye, Z.   Yokota, K.   Yuan, L.   Zhamkochyan, S.   Zhu, L.  

    The third generation spectroscopic study of Lambda hypernuclei using (e,e'K(+)) reaction (JLab E05-115) was performed at JLab Hall-C in 2009. The experiment introduced the newly developed high-resolution electron spectrometer (HES) with the existing high-resolution kaon spectrometer (HKS). Experimental configuration, conditions, spectrometer designs and current status of analysis are presented.
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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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  • Binding Energy of He-7(Lambda) and Test of Charge Symmetry Breaking in the Lambda N Interaction Potential'

    Hashimoto, O.   Fujii, Y.   Honda, D.   Kaneta, M.   Kato, F.   Kawama, D.   Maruyama, N.   Matsumura, A.   Nakamura, S. N.   Nomura, H.   Nonaka, K.   Ohtani, A.   Okayasu, Y.   Osaka, M.   Oyamada, M.   Sumihama, M.   Tamura, H.   Baker, O. K.   Cole, L.   Christy, M.   Gueye, P.   Keppel, C.   Tang, L.   Yuan, L.   Acha, A.   Baturin, P.   Boeglin, W.   Kramer, L.   Markowitz, P.   Pamela, P.   Perez, N.   Raue, B.   Reinhold, J.   Rivera, R.   Kato, S.   Sato, Y.   Takahashi, T.   Daniel, A.   Hungerford, Ed V.   Ispiryan, M.   Kalantarians, N.   Lan, K. J.   Li, Y.   Miyoshi, T.   Randeniya, S.   Rodriguez, V. M.   Bosted, P.   Carlini, R.   Ent, R.   Fenker, H.   Gaskell, D.   Jones, M.   Mack, D.   Roche, J.   Smith, G.   Tvaskis, V.   Vulcan, W.   Wood, S.   Yan, C.   Asaturyan, A.   Asaturyan, R.   Egiyan, K.   Mkrtchyan, A.   Mkrtchyan, H.   Margaryan, A.   Marikyan, G.   Navasardyan, T.   Tadevosyan, V.   Zamkochian, S.   Hu, B.   Song, Y.   Luo, W.   Androic, D.   Furic, M.   Petkovic, T.   Seva, T.   Ahmidouch, A.   Danagoulian, S.   Gasparian, A.   Halkyard, R.   Johnston, K.   Simicevic, N.   Wells, S.   Niculescu, G.   Niculescu, M-I   Gan, L.   Benmokhtar, F.   Horn, T.   Elaasar, M.   Gibson, E. F.  

    The binding energy of He-7(Lambda) has been obtained for the first time with reaction spectroscopy using the (e, e'K+) reaction at Jefferson Lab's Hall C. A comparison among the binding energies of the A=7 T=1 iso-triplet hypernuclei, He-7(Lambda), Li-7(Lambda)* and Be-7(Lambda), is made and possible charge symmetry breaking (CSB) in the AN potential is discussed. For He-7(Lambda) and Be-7(Lambda), the shifts in binding energies are opposite to those predicted by a recent cluster model calculation, which assumes that the unexplained part of the binding energy difference between H-4(Lambda) and He-4(Lambda), is due to the CSB of the AN potential. Further examination of CSB in light hypernuclear systems is required both experimentally and theoretically.
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  • Transverse momentum dependence of semi-inclusive pion production RID E-5803-2011

    Mkrtchyan, H.   Bosted, P. E.   Adams, G. S.   Ahmidouch, A.   Angelescu, I.   Arrington, J.   Asaturyan, R.   Baker, O. K.   Benmouna, N.   Bertoncini, C.   Blok, H. P.   Boeglin, W. U.   Breuer, H.   Christy, M. E.   Connell, S. H.   Cui, Y.   Dalton, M. M.   Danagoulian, S.   Day, D.   Dodario, T.   Dunne, J. A.   Dutta, D.   El Khayari, N.   Ent, R.   Fenker, H. C.   Frolov, V. V.   Gan, L.   Gaskell, D.   Hafidi, K.   Hinton, W.   Holt, R. J.   Horn, T.   Huber, G. M.   Hungerford, E.   Jiang, X.   Jones, M.   Joo, K.   Kalantarians, N.   Kelly, J. J.   Keppel, C. E.   Kubarovsky, V.   Li, Y.   Liang, Y.   Malace, S.   Markowitz, P.   McGrath, E.   McKee, P.   Meekins, D. G.   Moziak, B.   Navasardyan, T.   Niculescu, G.   Niculescu, I.   Opper, A. K.   Ostapenko, T.   Reimer, P. E.   Reinhold, J.   Roche, J.   Rock, S. E.   Schulte, E.   Segbefia, E.   Smith, C.   Smith, G. R.   Stoler, P.   Tadevosyan, V.   Tang, L.   Ungaro, M.   Uzzle, A.   Vidakovic, S.   Villano, A.   Vulcan, W. F.   Wang, M.   Warren, G.   Wesselmann, F.   Wojtsekhowski, B.   Wood, S. A.   Xu, C.   Yuan, L.   Zheng, X.   Zhu, H.  

    Cross sections for semi-inclusive electroproduction of charged pions (pi(+/-)) from both proton and deuteron targets were measured for 0.2 < x < 0.5, 2 < Q(2) < 4 GeV(2), 0.3 < z < 1, and P(t)(2) < 0.2 GeV(2). For P(t) < 0.1 GeV, we find the azimuthal dependence to be small, as expected theoretically. For both pi(+) and pi(-), the P(t) dependence from the deuteron is found to be slightly weaker than from the proton. In the context of a simple model, this implies that the initial transverse momenta width of d quarks is larger than for u quarks and, contrary to expectations, the transverse momentum width of the favored fragmentation function is larger than the unfavored one. (C) 2008 Elsevier B.V. All rights reserved.
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  • The HKS experiment on Lambda-hypernuclear spectroscopy via electroproduction at JLab

    Tang, L.   Yuan, L.   Acha, A.   Ahmidouch, A.   Androic, D.   Asaturyan, A.   Asaturyan, R.   Baker, O.K.   Baturin, P.   Benmokhtar, F.   Bosted, P.   Carlini, R.   Chen, X.   Christy, M.   Cole, L.   Danagoulian, S.   Daniel, A.   Dharmawardane, V.   Egiyan, K.   Elaasar, M.   Ent, R.   Fenker, H.   Fujii, Y.   Furic, M.   Gan, L.   Gaskell, D.   Gasparian, A.   Gibson, E.F.   Gueye, P.   Halkyard, R.   Hashimoto, O.   Honda, D.   Horn, T.   Hu, B.   Hu, S.   Hungerford, E.V.   Ispiryan, M.   Johnston, K.   Jones, M.   Kalantarians, N.   Kaneta, M.   Kato, F.   Kato, S.   Kawama, D.   Kepple, C.   Li, Y.   Luo, W.   Mack, D.   Margaryan, A.   Marikyan, G.   Maruyama, N.   Matsumura, A.   Miyoshi, T.   Mkrtchyan, A.   Mkrtchyan, H.   Nakamura, S.N.   Navasardyan, T.   Niculescu, G.   Niculescu, M.-I.   Nomura, H.   Nonaka, K.   Ohtani, A.   Okayasu, Y.   Pamela, P.   Perez, N.   Petkovic, T.   Randeniya, S.   Reinhold, J.   Rivera, R.   Roche, J.   Rodriguez, V.M.   Sato, Y.   Seva, T.   Simicevic, N.   Smith, G.   Sumihama, M.   Song, Y.   Tadevosyan, V.   Takahashi, T.   Tamura, H.   Tvaskis, V.   Vulcan, W.   Wang, B.   Wells, S.   Wood, S.   Yan, C.   Zamkochian, S.  

    The HKS (Jlab E01-011) experiment on spectroscopy of Lambda-hypernuclei using (e,e'K +) reaction was successfully carried out in 2005. This paper gives a brief description of the experiment and its technique and shows some of the preliminary spectra that are still under analysis. [All rights reserved Elsevier].
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  • A multi-processor CAMAC-based on-line system

    Masoni, A.   Puddu, G.   Birsa, R.   Dalla Torre-Colautti, S.   Lamanna, M.   Martin, A.   Tessarotto, F.   Ahmidouch, A.   Mascarini, C.   Rapin, D.   Faivre, J.C.   Agnello, M.   Iazzi, F.   De Marco, N.   Musso, A.   Piccotti, A.  

    The data acquisition system for the PS199 experiment is described. It is based on CAMAC modules with three J11 Starburst processors used for parallel event reduction and event building. A MicroVAX II and two VAXstations perform the run control and monitoring. A PC takes care of the laser calibration
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  • HYPERNUCLEAR SPECTROSCOPY WITH ELECTRON BEAM AT JLab HALL C

    Fujii, Y.   Chiba, A.   Doi, D.   Gogami, T.   Hashimoto, O.   Kanda, H.   Kaneta, M.   Kawama, D.   Maeda, K.   Maruta, T.   Matsumura, A.   Nagao, S.   Nakamura, S. N.   Shichijo, A.   Tamura, H.   Taniya, N.   Yamamoto, T.   Yokota, K.   Kato, S.   Sato, Y.   Takahashi, T.   Noumi, H.   Motoba, T.   Hiyama, E.   Albayrak, I.   Ates, O.   Chen, C.   Christy, M.   Keppel, C.   Kohl, M.   Li, Y.   Liyanage, A.   Tang, L.   Walton, T.   Ye, Z.   Yuan, L.   Zhu, L.   Baturin, P.   Boeglin, W.   Dhamija, S.   Markowitz, P.   Raue, B.   Reinhold, J.   Hungerford, Ed V.   Ent, R.   Fenker, H.   Gaskell, D.   Horn, T.   Jones, M.   Smith, G.   Vulcan, W.   Wood, S. A.   Johnston, C.   Simicevic, N.   Wells, S.   Samanta, C.   Hu, B.   Shen, J.   Wang, W.   Zhang, X.   Zhang, Y.   Feng, J.   Fu, Y.   Zhou, J.   Zhou, S.   Jiang, Y.   Lu, H.   Yan, X.   Ye, Y.   Gan, L.   Ahmidouch, A.   Danagoulian, S.   Gasparian, A.   Elaasar, M.   Wesselmann, F. R.   Asaturyan, A.   Margaryan, A.   Mkrtchyan, A.   Mkrtchyan, H.   Tadevosyan, V.   Androic, D.   Furic, M.   Petkovic, T.   Seva, T.   Niculescu, G.   Niculescu, I.   Lopez, V. M. Rodrguez   Cisbani, E.   Cusanno, F.   Garibaldi, F.   Uuciuoli, G. M.   De Leo, R.   Maronne, S.  

    Hypernuclear spectroscopy with electron beam at JLab Hall C has been studied since 2000. The first experiment, JLab E89-009, demonstrated the possibility of the (e,e'K(+)) reaction for hypernuclear spectroscopy by achieving an energy resolution of better than 1 MeV (FWHM). The second experiment, JLab E01-011 employed a newly constructed high resolution kaon spectrometer and introduced a vertically tilted electron arm setup to avoid electrons from bremsstrahlung and Moeller scattering. The setup allowed us to have 10 times yield rate and 4 times better signal to accidental ratio with expected energy resolution of 400 keV (FWHM). The third experiment, JLab E05-115 will be performed in 2009 with employing newly constructed high resolution electron spectrometer and a new charge-separation magnet. With the fully customized third generation experimental setup, we can study a variety of targets up to medium-heavy ones such as (52)Cr.
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  • Kaon, Pion, and Proton Associated Photofission of Bi Nuclei

    Song, Y.   Margaryan, A.   Acha, A.   Ahmidouch, A.   Androic, D.   Asaturyan, A.   Asaturyan, R.   Baker, O. K.   Baturin, P.   Benmokhtar, F.   Carlini, R.   Chen, X.   Christy, M.   Cole, L.   Danagoulian, S.   Daniel, A.   Dharmawardane, V.   Egiyan, K.   Elaasar, M.   Ent, R.   Fenker, H.   Fujii, Y.   Furic, M.   Gan, L.   Gaskell, D.   Gasparian, A.   Gibson, E. F.   Grigoryan, N.   Gueye, P.   Halkyard, R.   Hashimoto, O.   Honda, D.   Horn, T.   Hu, B.   Hu, S.   Hungerford, Ed. V.   Ispiryan, M.   Johnston, K.   Jones, M.   Kalantarians, N.   Kaneta, M.   Kato, F.   Kato, S.   Kawama, D.   Keppel, C.   Knyazyan, S.   Li, Y.   Luo, W.   Mack, D.   Marikyan, G.   Maruyama, N.   Matsumura, A.   Miyoshi, T.   Mkrtchyan, A.   Mkrtchyan, H.   Nakamura, S. N.   Navasardyan, T.   Niculescu, G.   Niculescu, M. -I.   Nomura, H.   Nonaka, K.   Ohtani, A.   Okayasu, Y.   Pamela, P.   Parlakyan, L.   Perez, N.   Petkovic, T.   Randeniya, S.   Reinhold, J.   Rivera, R.   Roche, J.   Rodriguez, V. M.   Sato, Y.   Seva, T.   Simicevic, N.   Smith, G.   Sumihama, M.   Tadevosyan, V.   Takahashi, T.   Tamura, H.   Tang, L.   Tvaskis, V.   Vardanyan, H.   Vulcan, W.   Wang, B.   Wells, S.   Wood, S.   Yan, C.   Yuan, L.  

    The first measurement of proton, pion, and kaon associated fission of Bi nuclei has been performed in a photon energy range 1.45 < E-gamma < 1.55 GeV. The fission probabilities are compared with an inclusive fission probabilities obtained with photons, protons and pions. The fission probability of Bi nuclei in coincidence with kaons is 0.18 +/- 0.06 which is similar to 3 times larger than the proton and pion associated fission probabilities and similar to 2 times larger than inclusive ones. The kaon associated excess fission events are explained in terms of bound. residual states and their weak nonmesonic decays.
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  • Hypernuclear Spectroscopy at JLab Hall C RID C-9249-2011

    Hashimoto, O.   Chiba, A.   Doi, D.   Fujii, Y.   Gogami, T.   Kanda, H.   Kaneta, M.   Kawama, D.   Maeda, K.   Maruta, T.   Matsumura, A.   Nagao, S.   Nakamura, S. N.   Shichijo, A.   Tamura, H.   Taniya, N.   Yamamoto, T.   Yokota, K.   Kato, S.   Sato, Y.   Takahashi, T.   Noumi, H.   Motoba, T.   Hiyama, E.   Albayrak, I.   Ates, O.   Chen, C.   Christy, M.   Keppel, C.   Kohl, M.   Li, Y.   Liyanage, A.   Tang, L.   Walton, T.   Ye, Z.   Yuan, L.   Zhu, L.   Baturin, P.   Boeglin, W.   Dhamija, S.   Markowitz, P.   Raue, B.   Reinhold, J.   Hungerford, Ed. V.   Ent, R.   Fenker, H.   Gaskell, D.   Horn, T.   Jones, M.   Smith, G.   Vulcan, W.   Wood, S. A.   Johnston, C.   Simicevic, N.   Wells, S.   Samanta, C.   Hu, B.   Shen, J.   Wang, W.   Zhang, X.   Zhang, Y.   Feng, J.   Fu, Y.   Zhou, J.   Zhou, S.   Jiang, Y.   Lu, H.   Yan, X.   Ye, Y.   Gan, L.   Ahmidouch, A.   Danagoulian, S.   Gasparian, A.   Elaasar, M.   Wesselmann, F. R.   Asaturyan, A.   Margaryan, A.   Mkrtchyan, A.   Mkrtchyan, H.   Tadevosyan, V.   Androic, D.   Furic, M.   Petkovic, T.   Seva, T.   Niculescu, G.   Niculescu, I.   Rodriguez, V. M.   Cisbani, E.   Cusanno, F.   Garibaldi, F.   Uuciuoli, G. M.   De Leo, R.   Maronne, S.   Achenback, P.   Pochodzala, J.  

    Since the 1st generation experiment, E89-009, which was successfully carried out as a pilot experiment of (e,e'K+) hypernuclear spectroscopy at JLab Hall C in 2000, precision hypernuclear spectroscopy by the (e,e'K+) reactions made considerable progress. It has evolved to the 2nd generation experiment, E01-011, in which a newly constructed high resolution kaon spectrometer (HKS) was installed and the "Tilt method" was adopted in order to suppress large electromagnetic background and to run with high luminosity. Preliminary high-resolution spectra of (7)(Lambda)He and (28)(Lambda)Al together with that of (12)(Lambda)B that achieved resolution better than 500 keV(FWHM) were obtained. The third generation experiment, E05-115, has completed data taking with an experimental setup combining a new splitter magnet, high resolution electron spectrometer (HES) and the HKS used in the 2nd generation experiment. The data were accumulated with targets of (7)Li, (9)Be, (10)B, (12)C and (52)Cr as well as with those of CH(2) and H(2)O for calibration. The analysis is under way with particular emphasis of determining precision absolute hypernuclear masses. In this article, hypernuclear spectroscopy program in the wide mass range at JLab Hall C that has undergone three generation is described.
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  • Plastic detectors for medium energy neutrons

    Ahmidouch, A.   Bach, P.   Hess, R.   Kunne, R.A.   Lechanoine-Leluc, C.   Mascarini, C.   Rapin, D.   Arvieux, J.   Bertini, R.   Catz, H.   Faivre, J.C.   Perrot-Kunne, F.   Bradamante, F.   Martin, A.  

    Three neutron detectors made up of a total of fifty-three vertical plastic scintillator bars BC412 (equivalent to NE110) with 8times20 cm 2 section and a sensitive height varying from 40 to 130 cm are used in the PS199 experiment at the CERN Low Energy Antiproton Ring (LEAR). Monitoring of the stability of the counters during data taking is done by a laser system. The TOF is calibrated with gamma rays from the pmacrprarrpi 0'srarrgamma's reaction. A new method to calibrate the amplitude of the counters at low energy using 4.4 MeV gamma rays from an 241Am/Be source is described, as well as a high energy calibration using cosmic muons. The absolute neutron detection efficiency of the counters is measured for neutron energies varying from 33 MeV to 204 MeV. Measurements are performed at five counter thresholds of 1.5, 2.5, 4.5, 6.5 and 8.5 MeV ee. A comparison of the experimental measurements with the predictions of a Monte Carlo computer code is presented
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  • 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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  • Angular dependence of analyzing power in np elastic scattering between 0.312 and 1.10 GeV

    Ball, J.   Chesny, Ph.   Combet, M.   Fontaine, J.M.   Lac, C.D.   Sans, J.L.   Bystricky, J.   Lehar, F.   de Lesquen, A.   de Mali, M.   Perrot-Kunne, F.   van Rossum, L.   Ahmidouch, A.   Bach, P.   Demierre, P.   Gaillard, G.   Hess, R.   Kunne, R.   Rapin, D.   Sormani, Ph.   Goudour, J.P.   Binz, R.   Klett, A.   Rossle, E.   Schmitt, H.   Lopiano, D.   Spinka, H.  

    The authors present a total of 427 np analyzing power data points in a large angular interval at 12 energies between 0.312 and 1.10 GeV. The SATURNE II polarized beam of free monochromatic neutrons was scattered either on the Saclay frozen-spin polarized proton target or on CH 2 and C targets. Present results are compared with existing elastic and quasielastic data
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