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Now showing items 1 - 15 of 15

  • as measured by charged lepton and neutrino scattering from iron targets

    Kalantarians, N.   Keppel, C.   Christy, M. E.  

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  • Transmission of high-power electron beams through small apertures

    Tschalaer, C.   Alarcon, R.   Balascuta, S.   Benson, S. V.   Bertozzi, W.   Boyce, J. R.   Cowan, R.   Douglas, D.   Evtushenko, P.   Fisher, P.   Ihloff, E.   Kalantarians, N.   Kelleher, A.   Legg, R.   Milner, R. G.   Neil, G. R.   Ou, L.   Schmookler, B.   Tennant, C.   Williams, G. P.   Zhang, S.  

    Tests were performed to pass a 100 MeV, 430 kWatt c.w. electron beam from the energy-recovery linac at the Jefferson Laboratory's FEL facility through a set of small apertures in a 127 mm long aluminum block. Beam transmission losses of 3 p.p.m. through a 2 mm diameter aperture were maintained during a 7 h continuous run. (c) 2013 Elsevier B.V. All rights reserved.
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  • DarkLight radiation backgrounds

    Kalantarians, N.   Maas, F.  

    We report measurements of photon and neutron radiation levels observed while transmitting a 0.43 MW electron beam through millimeter-sized apertures and during beam-on, but accelerating gradient RF-on, operation. These measurements were conducted at the Free-Electron Laser (FEL) facility of the Jefferson National Accelerator Laboratory (JLab) using a 100 MeV electron beam from an energy-recovery linear accelerator. The beam was directed successively through 6 mm, 4 mm, and 2 mm diameter apertures of length 127 mm in aluminum at a maximum current of 4.3 mA (430 kW beam power). This study was conducted to characterize radiation levels for experiments that need to operate in this environment, such as the proposed DarkLight Experiment. We find that sustained transmission of a 430 kW CW beam through a 2 mm aperture is feasible with manageable beam-related backgrounds. We also find that during beam-off, RF-on operation, field emission inside the niobium cavities of the accelerator cryomodules is the primary source of ambient radiation.
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  • DarkLight Radiation Backgrounds

    Kalantarians, N.  

    We report measurements of photon and neutron radiation levels observed while transmitting a 0.43 MW electron beam through millimeter-sized apertures and during beam-on, but accelerating gradient RF-on, operation. These measurements were conducted at the Free-Electron Laser (FEL) facility of the Jefferson National Accelerator Laboratory (JLab) using a 100 MeV electron beam from an energy-recovery linear accelerator. The beam was directed successively through 6 mm, 4 mm, and 2 mm diameter apertures of length 127 mm in aluminum at a maximum current of 4.3 mA (430 kW beam power). This study was conducted to characterize radiation levels for experiments that need to operate in this environment, such as the proposed DarkLight Experiment. We find that sustained transmission of a 430 kW CW beam through a 2 mm aperture is feasible with manageable beam-related backgrounds. We also find that during beam-off, RF-on operation, field emission inside the niobium cavities of the accelerator cryomodules is the primary source of ambient radiation.
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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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  • Exclusive rho(0) electroproduction on the proton at CLAS RID E-8618-2010

    Morrow, S. A.   Guidal, M.   Garcon, M.   Laget, J. M.   Smith, E. S.   Adams, G.   Adhikari, K. P.   Aghasyan, M.   Amaryan, M. J.   Anghinolfi, M.   Asryan, G.   Audit, G.   Avakian, H.   Bagdasaryan, H.   Baillie, N.   Ball, J. P.   Baltzell, N. A.   Barrow, S.   Battaglieri, M.   Bedlinskiy, I.   Bektasoglu, M.   Bellis, M.   Benmouna, N.   Berman, B. L.   Biselli, A. S.   Blaszczyk, L.   Bonner, B. E.   Bookwalter, C.   Bouchigny, S.   Boiarinov, S.   Bradford, R.   Branford, D.   Briscoe, W. J.   Brooks, W. K.   Bueltmann, S.   Burkert, V. D.   Butuceanu, C.   Calarco, J. R.   Careccia, S. L.   Carman, D. S.   Carnahan, B.   Casey, L.   Cazes, A.   Chen, S.   Cheng, L.   Cole, P. L.   Collins, P.   Coltharp, P.   Cords, D.   Corvisiero, P.   Crabb, D.   Crannell, H.   Crede, V.   Cummings, J. P.   Dale, D.   Dashyan, N.   De Masi, R.   De Vita, R.   De Sanctis, E.   Degtyarenko, P. V.   Denizli, H.   Dennis, L.   Deur, A.   Dhamija, S.   Dharmawardane, K. V.   Dhuga, K. S.   Dickson, R.   Didelez, J. -P.   Djalali, C.   Dodge, G. E.   Doughty, D.   Dugger, M.   Dytman, S.   Dzyubak, O. P.   Egiyan, H.   Egiyan, K. S.   El Fassi, L.   Elouadrhiri, L.   Eugenio, P.   Fatemi, R.   Fedotov, G.   Fersch, R.   Feuerbach, R. J.   Forest, T. A.   Fradi, A.   Gavalian, G.   Gevorgyan, N.   Gilfoyle, G. P.   Giovanetti, K. L.   Girod, F. X.   Goetz, J. T.   Gohn, W.   Gordon, C. I. O.   Gothe, R. W.   Graham, L.   Griffioen, K. A.   Guillo, M.   Guler, N.   Guo, L.   Gyurjyan, V.   Hadjidakis, C.   Hafidi, K.   Hakobyan, H.   Hanretty, C.   Hardie, J.   Hassall, N.   Heddle, D.   Hersman, F. W.   Hicks, K.   Hleiqawi, I.   Holtrop, M.   Hourany, E.   Hyde-Wright, C. E.   Ilieva, Y.   Ireland, D. G.   Ishkhanov, B. S.   Isupov, E. L.   Ito, M. M.   Jenkins, D.   Jo, H. S.   Johnstone, J. R.   Joo, K.   Juengst, H. G.   Kalantarians, N.   Keller, D.   Kellie, J. D.   Khandaker, M.   Khetarpal, P.   Kim, W.   Klein, A.   Klein, F. J.   Klimenko, A. V.   Kossov, M.   Kramer, L. H.   Kubarovsky, V.   Kuhn, J.   Kuhn, S. E.   Kuleshov, S. V.   Kuznetsov, V.   Lachniet, J.   Langheinrich, J.   Lawrence, D.   Li, Ji   Livingston, K.   Lu, H. Y.   MacCormick, M.   Marchand, C.   Markov, N.   Mattione, P.   McAleer, S.   McCracken, M.   McKinnon, B.   McNabb, J. W. C.   Mecking, B. A.   Mehrabyan, S.   Melone, J. J.   Mestayer, M. D.   Meyer, C. A.   Mibe, T.   Mikhailov, K.   Minehart, R.   Mirazita, M.   Miskimen, R.   Mokeev, V.   Morand, L.   Moreno, B.   Moriya, K.   Moteabbed, M.   Mueller, J.   Munevar, E.   Mutchler, G. S.   Nadel-Turonski, P.   Nasseripour, R.   Niccolai, S.   Niculescu, G.   Niculescu, I.   Niczyporuk, B. B.   Niroula, M. R.   Niyazov, R. A.   Nozar, M.   O'Rielly, G. V.   Osipenko, M.   Ostrovidov, A. I.   Park, K.   Park, S.   Pasyuk, E.   Paterson, C.   Pereira, S. Anefalos   Philips, S. A.   Pierce, J.   Pivnyuk, N.   Pocanic, D.   Pogorelko, O.   Polli, E.   Popa, I.   Pozdniakov, S.   Preedom, B. M.   Price, J. W.   Procureur, S.   Prok, Y.   Protopopescu, D.   Qin, L. M.   Raue, B. A.   Riccardi, G.   Ricco, G.   Ripani, M.   Ritchie, B. G.   Rosner, G.   Rossi, P.   Rubin, P. D.   Sabatie, F.   Saini, M. S.   Salamanca, J.   Salgado, C.   Santoro, J. P.   Sapunenko, V.   Schott, D.   Schumacher, R. A.   Serov, V. S.   Sharabian, Y. G.   Sharov, D.   Shvedunov, N. V.   Skabelin, A. V.   Smith, L. C.   Sober, D. I.   Sokhan, D.   Stavinsky, A.   Stepanyan, S. S.   Stepanyan, S.   Stokes, B. E.   Stoler, P.   Strakovsky, I. I.   Strauch, S.   Taiuti, M.   Tedeschi, D. J.   Tkabladze, A.   Tkachenko, S.   Todor, L.   Tur, C.   Ungaro, M.   Vineyard, M. F.   Vlassov, A. V.   Watts, D. P.   Weinstein, L. B.   Weygand, D. P.   Williams, M.   Wolin, E.   Wood, M. H.   Yegneswaran, A.   Yurov, M.   Zana, L.   Zhang, J.   Zhao, B.   Zhao, Z. W.  

    The ep -> e'pp(0) reaction has been measured using the 5.754 GeV electron beam of Jefferson Lab and the CLAS detector. This represents the largest ever set of data for this reaction in the valence region. Integrated and differential cross-sections are presented. The W, Q(2) and t dependences of the cross-section are compared to theoretical calculations based on the t-channel meson-exchange Regge theory, on the one hand, and on quark handbag diagrams related to Generalized Parton Distributions (GPDs) on the other hand. The Regge approach can describe at the approximate to 30% level most of the features of the present data while the two GPD calculations that are presented in this article which succesfully reproduce the high-energy data strongly underestimate the present data. The question is then raised whether this discrepancy originates from an incomplete or inexact way of modelling the GPDs or the associated hard scattering amplitude or whether the GPD formalism is simply inapplicable in this region due to higher-twists contributions, incalculable at present.
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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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  • Measurement of the nuclear multiplicity ratio for K(s)(0) hadronization at CLAS RID D-4072-2011

    Daniel, A.   Hicks, K.   Brooks, W. K.   Hakobyan, H.   Adhikari, K. P.   Adikaram, D.   Aghasyan, M.   Amarian, M.   Anghinolfi, M.   Avakian, H.   Baghdasaryan, H.   Battaglieri, M.   Batourine, V.   Bedlinskiy, I.   Bennett, R. P.   Biselli, A. S.   Bookwalter, C.   Briscoe, W. J.   Burkert, V. D.   Carman, D. S.   Casey, L.   Celentano, A.   Chandavar, S.   Cole, P. L.   Contalbrigo, M.   Crede, V.   D'Angelo, A.   Dashyan, N.   De Vita, R.   De Sanctis, E.   Deur, A.   Dey, B.   Dickson, R.   Djalali, C.   Dodge, G. E.   Doughty, D.   Egiyan, H.   El Fassi, L.   Elouadrhiri, L.   Eugenio, P.   Fedotov, G.   Fegan, S.   Gabrielyan, M. Y.   Gevorgyan, N.   Gilfoyle, G. P.   Giovanetti, K. L.   Girod, F. X.   Goetz, J. T.   Gohn, W.   Golovatch, E.   Gothe, R. W.   Griffioen, K. A.   Guidal, M.   Guo, L.   Hanretty, C.   Heddle, D.   Holtrop, M.   Hyde, C. E.   Ilieva, Y.   Ireland, D. G.   Ishkhanov, B. S.   Isupov, E. L.   Jawalkar, S. S.   Jo, H. S.   Joo, K.   Kalantarians, N.   Keller, D.   Khandaker, M.   Khetarpal, P.   Kim, A.   Kim, W.   Klein, A.   Klein, F. J.   Kubarovsky, V.   Kuleshov, S. V.   Kuznetsov, V.   Lu, N. Y.   MacGregor, I. J. D.   Mao, Y.   Markov, N.   Mayer, M.   McAndrew, J.   McKinnon, B.   Meyer, C. A.   Mineeva, T.   Mirazita, M.   Mokeev, V.   Moutarde, H.   Munevar, E.   Nadel-Turonski, P.   Ni, A.   Niccolai, S.   Niculescu, G.   Niculescu, I.   Osipenko, M.   Ostrovidov, A. I.   Paolone, M.   Pappalardo, L.   Paremuzyan, R.   Park, K.   Park, S.   Pasyuk, E.   Pereira, S. Anefalos   Phelps, E.   Pisano, S.   Pogorelko, O.   Pozdniakov, S.   Price, J. W.   Procureur, S.   Protopopescu, D.   Raue, B. A.   Ricco, G.   Rimal, D.   Ripani, M.   Rosner, G.   Rossi, P.   Sabatie, F.   Saini, M. S.   Salgado, C.   Schott, D.   Schumacher, R. A.   Seraydaryan, H.   Sharabian, Y. G.   Smith, G. D.   Sober, D. I.   Sokhan, D.   Stepanyan, S. S.   Stepanyan, S.   Strauch, S.   Taiuti, M.   Tang, W.   Taylor, C. E.   Tkachenko, S.   Ungaro, M.   Vernarsky, B.   Vineyard, M. F.   Voskanyan, H.   Voutier, E.   Watts, D. P.   Weinstein, L. B.   Weygand, D. P.   Wood, M. H.   Zana, L.   Zachariou, N.   Zhao, B.   Zhao, Z. W.  

    The influence of cold nuclear matter on lepto-production of hadrons in semi-inclusive deep inelastic scattering is measured using the CLAS detector in Hall B at Jefferson Lab and a 5.014 GeV electron beam. We report the K(s)(0) multiplicity ratios for targets of C, Fe, and Pb relative to deuterium as a function of the fractional virtual photon energy z transferred to the K(s)(0) and the transverse momentum squared p(T)(2). of the K(s)(0). We find that the multiplicity ratios for K(s)(0) are reduced in the nuclear medium at high z and low p(T)(2), with a trend for the K(s)(0) momentum to be broadened in the nucleus for large p(T)(2). (C) 2011 Elsevier B.V. All rights reserved.
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  • Measured radiation and background levels during transmission of megawatt electron beams through millimeter apertures

    Alarcon, R.   Balascuta, S.   Benson, S. V.   Bertozzi, W.   Boyce, J. R.   Cowan, R.   Douglas, D.   Evtushenko, P.   Fisher, P.   Ihloff, E.   Kalantarians, N.   Kelleher, A.   Kossler, W. J.   Legg, R.   Long, E.   Milner, R. G.   Neil, G. R.   Ou, L.   Schmookler, B.   Tennant, C.   Tschalaer, C.   Williams, G. P.   Zhang, S.  

    We report measurements of photon and neutron radiation levels observed while transmitting a 043 MW electron beam through millimeter sized apertures and during beam off, but accelerating gradient RF-orL operation. These measurements were conducted at the Free Electron Laser (FEL) facility of the Jefferson National Accelerator Laboratory (JLab) using a 100 mev electron beam from an energy recovery linear accelerator. The beam was directed successively through 6 mm, 4 mm, and 2 mm diameter apertures of length 127 mm in aluminum at a maximum current of 4.3 mA (430 kW beam power). This study was conducted to characterize radiation levels for experiments that need to operate in this environment, such as the proposed DarkLight Experiment. We rind that sustained transmission of a 430 kW continuouswave (CW) beam through a 2 mm aperture is feasible with manageable beam-related backgrounds. We also rind that during beam-off, RE-on operation, multipactoring inside the niobium cavities of the accelerator cryomodules is the primary source of ambient radiation when the machine is tuned for 130 mev operation. (C) 2013 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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  • Performance check of the CsI(Tl) calorimeter for the J-PARC E36 experiment by observing e(+) from muon decay

    Ito, H.   Horie, K.   Shimizu, S.   Bianchin, S.   Djalali, C.   Dongwi, B.   Gill, D.   Hasinoff, M. D.   Igarashi, Y.   Imazato, J.   Kalantarians, N.   Kawai, H.   Kimur, S.   Kobayashi, A.   Kodama, S.   Kohl, M.   Lu, H.   Mineev, O.   Tabata, M.   Tanuma, R.   Yershov, N.  

    The J-PARCE36 experiment is searching for lepton universally violation with a stopped kaon beam by measuring the ratio of the K+ decay widths Gamma(K-e(2))/Gamma (K-mu 2 ) =3D Gamma (K+-> e(+)v(e)) / Gamma(K+-> mu(+)v(mu) ). Since the radiative K+-> e(+)v(e)gamma decays are backgrounds to be removed in this measurement, the radiated gamma rays were detected in a CsI(Tl) calorimeter. The energy calibration for the 768 CsI(Tl) modules was performed using mono-chromatic les from the K(mu 2)decays. The delayed e(+) signals from the muon decays were required in order to improve the S/N ratio of the K-mu 2 peak by suppressing background events. In addition, a new energy calibration method of the CsI(Tl) calorimeter using stopped cosmic muons has been established.
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  • Evidence for a backward peak in the gamma d -> pi(0)d cross section near the eta threshold RID E-8618-2010 RID B-4083-2012

    Ilieva, Y.   Berman, B. L.   Kudryavtsev, A. E.   Strakovsky, I. I.   Tarasov, V. E.   Amarian, M.   Ambrozewicz, P.   Anghinolfi, M.   Asryan, G.   Avakian, H.   Bagdasaryan, H.   Baillie, N.   Ball, J. P.   Baltzell, N. A.   Batourine, V.   Battaglieri, M.   Bedlinskiy, I.   Bellis, M.   Benmouna, N.   Biselli, A. S.   Bouchigny, S.   Boiarinov, S.   Bradford, R.   Branford, D.   Briscoe, W. J.   Brooks, W. K.   Bueltmann, S.   Burkert, V. D.   Butuceanu, C.   Calarco, J. R.   Careccia, S. L.   Carman, D. S.   Chen, S.   Cole, P. L.   Collins, P.   Coltharp, P.   Crabb, D.   Crede, V.   De Masi, R.   De Sanctis, E.   De Vita, R.   Degtyarenko, P. V.   Deur, A.   Dickson, R.   Djalali, C.   Dodge, G. E.   Donnelly, J.   Doughty, D.   Dugger, M.   Dzyubak, O. P.   Egiyan, H.   Egiyan, K. S.   Elouadrhiri, L.   Eugenio, P.   Fedotov, G.   Feldman, G.   Funsten, H.   Garcon, M.   Gavalian, G.   Gilfoyle, G. P.   Giovanetti, K. L.   Girod, F. X.   Goetz, J. T.   Gonenc, A.   Gothe, R. W.   Griffioen, K. A.   Guidal, M.   Guler, N.   Guo, L.   Gyurjyan, V.   Hafidi, K.   Hakobyan, R. S.   Hersman, F. W.   Hicks, K.   Hleiqawi, I.   Holtrop, M.   Hyde-Wright, C. E.   Ireland, D. G.   Ishkhanov, B. S.   Isupov, E. L.   Ito, M. M.   Jenkins, D.   Jo, H. S.   Joo, K.   Juengst, H. G.   Kalantarians, N.   Kellie, J. D.   Khandaker, M.   Kim, W.   Klein, A.   Klein, F. J.   Kossov, M.   Krahn, Z.   Kramer, L. H.   Kubarovsky, V.   Kuhn, J.   Kuhn, S. E.   Kuleshov, S. V.   Lachniet, J.   Laget, J. M.   Langheinrich, J.   Lawrence, D.   Livingston, K.   Lu, H.   MacCormick, M.   Markov, N.   McKinnon, B.   Mecking, B. A.   Mestayer, M. D.   Meyer, C. A.   Mibe, T.   Mikhailov, K.   Mirazita, M.   Miskimen, R.   Mokeev, V.   Moriya, K.   Morrow, S. A.   Moteabbed, M.   Munevar, E.   Mutchler, G. S.   Nadel-Turonski, P.   Nasseripour, R.   Niccolai, S.   Niculescu, G.   Niculescu, I.   Niczyporuk, B. B.   Niroula, M. R.   Niyazov, R. A.   Nozar, M.   Osipenko, M.   Ostrovidov, A. I.   Park, K.   Pasyuk, E.   Paterson, C.   Pierce, J.   Pivnyuk, N.   Pogorelko, O.   Pozdniakov, S.   Price, J. W.   Prok, Y.   Protopopescu, D.   Raue, B. A.   Ricco, G.   Ripani, M.   Ritchie, B. G.   Ronchetti, F.   Rosner, G.   Rossi, P.   Sabatie, F.   Salgado, C.   Santoro, J. P.   Sapunenko, V.   Schumacher, R. A.   Serov, V. S.   Sharabian, Y. G.   Shvedunov, N. V.   Smith, E. S.   Smith, L. C.   Sober, D. I.   Stavinsky, A.   Stepanyan, S. S.   Stepanyan, S.   Stokes, B. E.   Stoler, P.   Strauch, S.   Taiuti, M.   Tedeschi, D. J.   Thoma, U.   Tkabladze, A.   Tkachenko, S.   Tur, C.   Ungaro, M.   Vineyard, M. F.   Vlassov, A. V.   Watts, D. P.   Weinstein, L. B.   Weygand, D. P.   Williams, M.   Wolin, E.   Wood, M. H.   Yegneswaran, A.   Zana, L.   Zhang, J.   Zhao, B.   Zhao, Z.  

    High-quality cross sections for the reaction gamma d -> pi(0)d have been measured using the CLAS at Jefferson Lab over a wide energy range near and above the eta-meson photoproduction threshold. At backward c.m. angles for the outgoing pions, we observe a resonance-like structure near E(gamma) = 700 MeV. Our model analysis shows that it can be explained by eta excitation in the intermediate state. The effect is the result of the contribution of the N(1535) S(11)-resonance to the amplitudes of the subprocesses occurring between the two nucleons and of a two-step process in which the excitation of an intermediate eta-meson dominates.
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  • AIP Conference Proceedings [AIP WORKSHOP TO EXPLORE PHYSICS OPPORTUNITIES WITH INTENSE, POLARIZED ELECTRON BEAMS AT 50-300 MEV - Cambridge, Massachusetts, USA (14–16 March 2013)] - DarkLight radiation backgrounds

    Kalantarians, N.   DarkLight Collaboration,  

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  • BoNus: Development and use of a radial TPC using cylindrical GEMs

    Fenker, H.   Baillie, N.   Bradshaw, P.   Bueltmann, S.   Burkert, V.   Christy, M.   Dodge, G.   Dutta, D.   Ent, R.   Evans, J.   Fersch, R.   Giovanetti, K.   Griffioen, K.   Ispiryan, M.   Jayalath, C.   Kalantarians, N.   Keppel, C.   Kuhn, S.   Niculescu, G.   Niculescu, I.   Tkachenko, S.   Tvaskis, V.   Zhang, J.  

    A specialized system of target and detector was developed at Jefferson Lab to provide new access to information about neutron structure from electron-neutron interactions. It allows identification and measurement of spectator protons produced in e(-)d --> e(-)p(s)X scattering events. The detector is a radial time-projection chamber optimized for the acceptance of low-momentum protons. Gas gain is provided by three cascaded curved Gas Electron Multipliers (GEMs), the first application of GEMs in any configuration other than flat. This article provides details about the development and construction of the detector, its performance, and the analysis of the data from the successful running of its first physics experiment. (C) 2008 Elsevier B.V. All rights reserved.
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