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18. The CLAS12 Spectrometer at Jefferson Laboratory

Author

Burkert, V.D., Elouadrhiri, L., Adhikari, K.P., Adhikari, S., Amaryan, M.J., Anderson, D., Angelini, G., Antonioli, M., Atac, H., Aune, S., Avakian, H., Gayoso, C. Ayerbe, Baltzell, N., Barion, L., Battaglieri, M., Baturin, V., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A.S., Bonneau, P., Bossù, F., Boyarinov, S., Briscoe, W.J., Brooks, W.K., Bruhwel, K., Carman, D.S., Celentano, A., Charles, G., Chatagnon, P., Chetry, T., Christiaens, G., Christo, S., Ciullo, G., Clary, B.A., Cole, P.L., Contalbrigo, M., Cook, M., Crede, V., Cruz-Torres, R., Cuevas, C., D’Angelo, A., Dashyan, N., Defurne, M., Deur, A., De Vita, R., Diehl, S., Djalali, C., Dodge, G., Dupre, R., Ehrhart, M., El Fassi, L., Eng, B., Ewing, T., Fair, R., Fedotov, G., Filippi, A., Forest, T.A., Garçon, M., Gavalian, G., Ghoshal, P., Gilfoyle, G.P., Giovanetti, K., Girod, F.X., Glazier, D.I., Golovatch, E., Gothe, R.W., Gotra, Y., Griffioen, K.A., Guidal, M., Gyurjyan, V., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Hauenstein, F., Hayward, T.B., Heddle, D., Hemler, P., Hen, O.A., Hicks, K., Hobart, A., Hogan, J., Holtrop, M., Ilieva, Y., Illari, I., Insley, D., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jacobs, G., Jo, H.S., Johnston, R., Joo, K., Joosten, S., Kageya, T., Kashy, D., Keith, C., Keller, D., Khachatryan, M., Khanal, A., Kim, A., Kim, C.W., Kim, W., Kubarovsky, V., Kuhn, S.E., Lanza, L., Leffel, M., Lucherini, V., Lung, A., Kabir, M.L., Leali, M., Lee, S., Lenisa, P., Livingston, K., Lowry, M., MacGregor, I.J.D., Mandjavidze, I., Marchand, D., Markov, N., Mascagna, V., McKinnon, B., McMullen, M., Mealer, C., Mestayer, M.D., Meziani, Z.E., Miller, R., Milner, R.G., Mineeva, T., Mirazita, M., Mokeev, V., Moran, P., Movsisyan, A., Camacho, C. Munoz, Naidoo, P., Nanda, S., Newton, J., Niccolai, S., Niculescu, G., Osipenko, M., Paolone, M., Pappalardo, L.L., Paremuzyan, R., Pastor, O., Pasyuk, E., Phelps, W., Pogorelko, O., Poudel, J., Price, J.W., Price, K., Procureur, S., Prok, Y., Protopopescu, D., Rajput-Ghoshal, R., Raue, B.A., Raydo, B., Ripani, M., Ritman, J., Rizzo, A., Rosner, G., Rossi, P., Rowley, J., Roy, B.J., Sabatié, F., Salgado, C., Schadmand, S., Schmidt, A., Segarra, E.P., Sergeyeva, V., Sharabian, Y.G., Shrestha, U., Skorodumina, Iu., Smith, G.D., Smith, L.C., Sokhan, D., Soto, O., N.Sparveris, Stepanyan, S., Stoler, P., Strauch, S., Tan, J.A., Taylor, M., Tilles, D., Turisini, M., Tyler, N., Ungaro, M., Venturelli, L., Voskanyan, H., Voutier, E., Watts, D., Wei, X., Weinstein, L.B., Wiggins, C., Wiseman, M., Wood, M.H., Yegneswaran, A., Young, G., Zachariou, N., Zarecky, M., Zhang, J., Zhao, Z.W., and Ziegler, V.

Published
2020
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38. Measurement of the helicity asymmetry $\mathbb{E}$ for the $\vec{\gamma}\vec{p} \to p \pi^0$ reaction in the resonance region

Author

Kim, C.W, Zachariou, N, Bashkanov, M, Briscoe, W.J, Fegan, S, Kashevarov, V.L, Nikonov, K, Sarantsev, A, Schmidt, A, Strakovsky, I.I, Watts, D.P, Workman, R.L, Achenbach, P, Akbar, Z, Amaryan, M.J, Angelini, G, Armstrong, W.R, Atac, H, Baashen, L, Baltzell, N.A, Barion, L, Battaglieri, M, Bedlinskiy, I, Benkel, B, Benmokhtar, F, Benmouna, N, Bianconi, A, Biselli, A.S, Booth, W.A, Bossù, F, Boiarinov, S, Brinkmann, K.T, Brock, J, Bulumulla, D, Burkert, V.D, Cao, T, Carlin, C, Carman, D.S, Carvajal, J.C, Chatagnon, P, Chesnokov, V, Chetry, T, Ciullo, G, Clash, G, Cole, P.L, Contalbrigo, M, Becerra, O. Cortes, Costantini, G, Crede, V, d'Angelo, A, Dashyan, N, de Vita, R, Defurne, M, Deur, A, Diehl, S, Djalali, C, Dugger, M, Dupre, R, Egiyan, H, Alaoui, A. El, Fassi, L. El, Elouadrhiri, L, Eugenio, P, Filippi, A, Fogler, C, Gavalian, G, Gilfoyle, G.P, Golubenko, A.A, Gosta, G, Gothe, R.W, Griffioen, K.A, Hafidi, K, Hakobyan, H, Hattawy, M, Hauenstein, F, Hayward, T.B, Heddle, D, Hobart, A, Holtrop, M, Ilieva, Y, Illari, I, Ireland, D.G, Isupov, E.L, Iwamoto, H, Jenkins, D, Jo, H.S, Johnston, R, Joo, K, Joosten, S, Kageya, T, Keith, C.D, Keller, D, Khanal, A, Kim, A, Kim, W, Klein, F.J, Klimenko, V, Kripko, A, Kubarovsky, V, Lanza, L, Leali, M, Lee, S, Li, X, Livingston, K, Macgregor, I.J.D, Marchand, D, Mascagna, V, Mckinnon, B, Migliorati, S, Milner, R.G, Mineeva, T, Mokeev, V, Munoz Camacho, C, Nadel-Turonski, P, Neupane, K, Niccolai, S, Osipenko, M, Ostrovidov, A.I, Pandey, P, Paolone, M, Pappalardo, L.L, Paremuzyan, R, Pasyuk, E, Paul, S.J, Pilleux, N, Pokhrel, M, Poudel, J, Price, J.W, Prok, Y, Radic, A, Ramasubramanian, N, Ratliff, S, Reed, T, Richards, J, Ripani, M, Ritchie, B.G, Ritman, J, Rosner, G, Salgado, C, Schadmand, S, Schott, D, Schumacher, R.A, Scott, M.B.C, Seely, M.L, Seroka, E.M, Shirokov, E.V, Shrestha, U, Sokhan, D, Sparveris, N, Spreafico, M, Strauch, S, Tan, J, Tyson, R, Ungaro, M, Vallarino, S, Venturelli, L, Voskanyan, H, Voutier, E, Wei, X, Williams, R, Wishart, R, Wood, M.H, Yurov, M, Zhang, J, Zurek, M, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and CLAS

Subjects
sum rule, beam, energy, helicity, asymmetry, CLAS, multipole, GeV, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], photon, beam, Nuclear Experiment
Abstract

The double-spin-polarization observable $\mathbb{E}$ for $\vec{\gamma}\vec{p}\to p\pi^0$ has been measured with the CEBAF Large Acceptance Spectrometer (CLAS) at photon beam energies $E_\gamma$ from 0.367 to $2.173~\mathrm{GeV}$ (corresponding to center-of-mass energies from 1.240 to $2.200~\mathrm{GeV}$) for pion center-of-mass angles, $\cos\theta_{\pi^0}^{c.m.}$, between -0.86 and 0.82. These new CLAS measurements cover a broader energy range and have smaller uncertainties compared to previous CBELSA data and provide an important independent check on systematics. These measurements are compared to predictions as well as new global fits from The George Washington University, Mainz, and Bonn-Gatchina groups. Their inclusion in multipole analyses will refine our understanding of the single-pion production contribution to the Gerasimov-Drell-Hearn sum rule and improve the determination of resonance properties., Comment: 11 pages, 5 figures

Published
2023

44. Surface thermodynamic properties by reverse phase chromatography and visual traits using computer vision techniques on Amberlite XAD-7 acrylic-ester-resin

Author

Kumar, B.P., Hamieh, T., Kakani, V., Rao, P.V., Pasupuleti, K.S., Ramesh, S., Kim, M.D., Kim, C.W., Kumar, B.P., Hamieh, T., Kakani, V., Rao, P.V., Pasupuleti, K.S., Ramesh, S., Kim, M.D., and Kim, C.W.

Abstract

In the current work, the surface thermodynamic properties of Amberlite XAD-7 acrylic-ester-resin have been determined. The inverse gas chromatography (IGC) technique at infinite dilution was applied to estimate the London dispersive surface free energy.ds was estimated by using the well-known Fowkes equation, Dorris-Gray relation, Hamieh-Dorris-Gray model and six other molecular models based on the values of the surface areas of organic molecules and Hamieh model considering the thermal effect. The London dispersive surface free energy values are reduced by increasing temperature in all used methods and models. The Gibbs surface free energy of the adsorption values also decreased by increasing temperature in all 14 methods such as that of Swayer-Brookman, Saint-Flour Papirer, Donnet, Brendle and Papirer, Chehimi et al, Hamieh methods (thermal method) and the methods of the enthalpy of vaporization as a function of the temperature.H0 vapoTTHORN and the standard enthalpy of formation. Delta H-f(0) and the six molecular models. The Lewis acidity parameter K-A and Lewis basicity parameter, K-D was calculated by the above stated 14 methods. The surface character "S" value was estimated to be greater than one in all the 14 methods. This indicate that the Amberlite XAD-7 polymer material contains mostly basic sites than the acidic sites, and it can be strongly interactive with an acidic media. In addition, the visual traits such as pore size distribution, surface roughness and intricate surface morphology of the polymer resin in its original form have been explored using computer vision techniques.

Published
2022

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