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5 results on '"C. S. Yoon"'

1. Study of eco-friendly gas mixtures for SHiP RPCs

Author

Yunhui Jo, Jong-Kwan Woo, Kisuk Choi, J.-W. Ko, K. S. Lee, J. Y. Sohn, Kang Young Lee, Y. G. Kim, C. S. Yoon, B. D. Park, Seon-Won Kim, and Moon-Sik Kang

Subjects
Resistive touchscreen, Freon, Large Hadron Collider, Nuclear engineering, Detector, General Physics and Astronomy, Environmental science, High voltage, Environmentally friendly, Compact Muon Solenoid, Global-warming potential
Abstract

Over the past few decades, tetrafluoroethane (TFE, R134a Freon)-based gases have been widely used in the operation of phenolic resistive plate chambers (RPCs) in many high-energy experiments. However, TFE has a high global warming potential (GWP); therefore, a search for new eco-friendly gases to replace traditional TFE-based ones is now unavoidable. In this research, we present cosmic-ray test results of a prototype RPC for the SHiP (search for hidden particles) experiment using 1.6- and 1.4-mm-thick RPC electrodes containing mixtures of various gases, including 1,3,3,3-tetrafluoropropene (HFO1234ze), CO2, iC4H10 and SF6. We compare the performance data gathered with these new gas mixtures with those gathered with a traditional TFE-based gas used for RPCs in compact muon solenoid (CMS) and a toroidal LHC apparatus (ATLAS) experiments. The addition of CO2 to the HFO1234ze-based gas was found to be fairly effective in reducing the working-point high voltage (HVWP) for RPC operation. The results of our experiments lead us to the conclusion that adding 40% CO2 or less, when combined with HFO1234ze-based gas, is conducive to reliable detector performance for SHiP single-gap phenolic RPCs.

Published
2021

2. First observation of a tau neutrino charged current interaction with charm production in the OPERA experiment

Author

G. De Lellis, C. Kamiscioglu, L. Votano, R. Brugnera, F. Laudisio, S. Gorbunov, F. Pupilli, A. Longhin, A. Buonaura, A. Garfagnini, Timur Dzhatdoev, Nicola D'Ambrosio, Tatsuhiro Naka, P. F. Loverre, Motoaki Miyanishi, P. Strolin, Alessandra Pastore, Marcos Dracos, Satoru Takahashi, E. Shibayama, Toshiyuki Nakano, M. Nakamura, M. Tenti, A. Schembri, Krešimir Jakovčić, L. Paparella, R. A. Fini, C. Gustavino, H. Shibuya, Gianfranca De Rosa, N. I. Starkov, D. Duchesneau, E. Voevodina, N. G. Polukhina, T. Hara, I. Kreslo, Seok Kim, Tomoko Ariga, M. De Serio, J. Ebert, M. Kamiscioglu, M. Pozzato, Kunihiro Morishima, T. Matsuo, N. Di Marco, T. Hayakawa, T. Fukuda, Cristiano Bozza, V. A. Matveev, N. M. Okateva, Naotaka Naganawa, A. Bertolin, Anselmo Meregaglia, V. Gentile, H. Pessard, Antonio Ereditato, M. Malenica, J. Goldberg, Osamu Sato, Adele Lauria, M. Roda, Cécile Jollet, Salvatore Buontempo, M. Spinetti, M. T. Muciaccia, E. Medinaceli, A. S. Malgin, L. Pasqualini, L. Patrizii, G. Mandrioli, G. Sirri, Artem Chukanov, D. A. Podgrudkov, S. Dmitrievski, T. V. Shchedrina, P. del Amo Sanchez, A. Iuliano, S. Simone, Chiara Sirignano, S. Dusini, Alessandro Paoloni, S. Vasina, Mario Stipčević, Katsumi Ishiguro, M. Chernyavskiy, F. Mizutani, I. Shakirianova, A. Di Crescenzo, N. Agafonova, Utku Kose, A. M. Guler, G. Grella, F. Fornari, B. Klicek, Giuliana Galati, J. L. Vuilleumier, K. Ozaki, V. Tioukov, T. Shiraishi, A. Sotnikov, Nobuko Kitagawa, Masahiro Komatsu, D. Di Ferdinando, O. G. Ryazhskaya, C. S. Yoon, Y. A. Gornushkin, Gaston Wilquet, S. Mikado, Maria Cristina Montesi, Hiroki Rokujo, Simona Maria Stellacci, Akitaka Ariga, Shigeki Aoki, L. Stanco, Pierre Vilain, A. Hollnagel, P. Monacelli, A. B. Aleksandrov, T. M. Roganova, N. Mauri, B. D. Park, A. M. Anokhina, Kimio Niwa, S. Ogawa, K. Kodama, Caren Hagner, L. Consiglio, F. Terranova, Agafonova N., Aleksandrov A., Anokhina A., Aoki S., Ariga A., Ariga T., Bertolin A., Bozza C., Brugnera R., Buonaura A., Buontempo S., Chernyavskiy M., Chukanov A., Consiglio L., D'Ambrosio N., De Lellis G., De Serio M., del AmoSanchez P., Di Crescenzo A., Di Ferdinando D., Di Marco N., Dmitrievski S., Dracos M., Duchesneau D., Dusini S., Dzhatdoev T., Ebert J., Ereditato A., Fini R.A., Fornari F., Fukuda T., Galati G., Garfagnini A., Gentile V., Goldberg J., Gorbunov S., Gornushkin Y., Grella G., Guler A.M., Gustavino C., Hagner C., Hara T., Hayakawa T., Hollnagel A., Ishiguro K., Iuliano A., Jakovcic K., Jollet C., Kamiscioglu C., Kamiscioglu M., Kim S.H., Kitagawa N., Klicek B., Kodama K., Komatsu M., Kose U., Kreslo I., Laudisio F., Lauria A., Longhin A., Loverre P., Malgin A., Malenica M., Mandrioli G., Matsuo T., Matveev V., Mauri N., Medinaceli E., Meregaglia A., Mikado S., Miyanishi M., Mizutani F., Monacelli P., Montesi M.C., Morishima K., Muciaccia M.T., Naganawa N., Naka T., Nakamura M., Nakano T., Niwa K., Okateva N., Ogawa S., Ozaki K., Paoloni A., Paparella L., Park B.D., Pasqualini L., Pastore A., Patrizii L., Pessard H., Podgrudkov D., Polukhina N., Pozzato M., Pupilli F., Roda M., Roganova T., Rokujo H., Rosa G., Ryazhskaya O., Sato O., Schembri A., Shakirianova I., Shchedrina T., Shibuya H., Shibayama E., Shiraishi T., Simone S., Sirignano C., Sirri G., Sotnikov A., Spinetti M., Stanco L., Starkov N., Stellacci S.M., Stipcevic M., Strolin P., Takahashi S., Tenti M., Terranova F., Tioukov V., Vasina S., Vilain P., Voevodina E., Votano L., Vuilleumier J.L., Wilquet G., Yoon C.S., Agafonova, N, Aleksandrov, A, Anokhina, A, Aoki, S, Ariga, A, Ariga, T, Bertolin, A, Bozza, C, Brugnera, R, Buonaura, A, Buontempo, S, Chernyavskiy, M, Chukanov, A, Consiglio, L, D'Ambrosio, N, De Lellis, G, De Serio, M, del AmoSanchez, P, Di Crescenzo, A, Di Ferdinando, D, Di Marco, N, Dmitrievski, S, Dracos, M, Duchesneau, D, Dusini, S, Dzhatdoev, T, Ebert, J, Ereditato, A, Fini, R, Fornari, F, Fukuda, T, Galati, G, Garfagnini, A, Gentile, V, Goldberg, J, Gorbunov, S, Gornushkin, Y, Grella, G, Guler, A, Gustavino, C, Hagner, C, Hara, T, Hayakawa, T, Hollnagel, A, Ishiguro, K, Iuliano, A, Jakovcic, K, Jollet, C, Kamiscioglu, C, Kamiscioglu, M, Kim, S, Kitagawa, N, Klicek, B, Kodama, K, Komatsu, M, Kose, U, Kreslo, I, Laudisio, F, Lauria, A, Longhin, A, Loverre, P, Malgin, A, Malenica, M, Mandrioli, G, Matsuo, T, Matveev, V, Mauri, N, Medinaceli, E, Meregaglia, A, Mikado, S, Miyanishi, M, Mizutani, F, Monacelli, P, Montesi, M, Morishima, K, Muciaccia, M, Naganawa, N, Naka, T, Nakamura, M, Nakano, T, Niwa, K, Okateva, N, Ogawa, S, Ozaki, K, Paoloni, A, Paparella, L, Park, B, Pasqualini, L, Pastore, A, Patrizii, L, Pessard, H, Podgrudkov, D, Polukhina, N, Pozzato, M, Pupilli, F, Roda, M, Roganova, T, Rokujo, H, Rosa, G, Ryazhskaya, O, Sato, O, Schembri, A, Shakirianova, I, Shchedrina, T, Shibuya, H, Shibayama, E, Shiraishi, T, Simone, S, Sirignano, C, Sirri, G, Sotnikov, A, Spinetti, M, Stanco, L, Starkov, N, Stellacci, S, Stipcevic, M, Strolin, P, Takahashi, S, Tenti, M, Terranova, F, Tioukov, V, Vasina, S, Vilain, P, Voevodina, E, Votano, L, Vuilleumier, J, Wilquet, G, and Yoon, C

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Neutral current, 010308 nuclear & particles physics, tau neutrino interaction, charm production, OPERA, 01 natural sciences, neutrino, Pair production, Tau neutrino, 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), Charm (quantum number), Neutrino, 010306 general physics, Engineering (miscellaneous), Event (particle physics), Charged current
Abstract

An event topology with two secondary vertices compatible with the decay of short-lived particles was found in the analysis of neutrino interactions in the OPERA target. The observed topology is compatible with tau neutrino charged current (CC) interactions with charm production and neutrino neutral current (NC) interactions with $$c\overline{c}$$cc¯ pair production. However, other processes can mimic this topology. A dedicated analysis was implemented to identify the underlying process. A Monte Carlo simulation was developed and complementary procedures were introduced in the kinematic reconstruction. A multivariate analysis technique was used to achieve an optimal separation of signal from background. Most likely, this event is a $$\nu _{\tau }$$ντ CC interaction with charm production, the tau and charm particle decaying into 1 prong and 2 prongs, respectively. The significance of this observation is evaluated.

Published
2020

3. First observation of the ΣN decay of the S = - 2 system

Author

Kenichi Imai, S. Torikai, N. Yasuda, M. Yosoi, Hiroyuki Noumi, H. Hayata, S. Ogawa, D.H. Davis, T. Kouketsu, J. Y. Kim, I. G. Park, H. Tanaka, Y. L. Lee, K. Tanida, Y. S. Iwata, Takayoshi Kawai, C. Nagoshi, Michiko Sekimoto, K. M. Baik, Y. Kakita, K. S. Sim, H. Okabe, M. Kaneko, Koji Yamamoto, Adam Rusek, C. O. Kim, Kazuma Nakazawa, B. Bassalleck, J. H. Chung, Shigeki Aoki, Y. S. Ra, Saewoong Bahk, Masaharu Ieiri, M. Mitsuhara, J. S. Song, Tomokazu Fukuda, H. Akikawa, L. H. Zhu, J. K. Ahn, M. S. Chung, D. Seki, T. Tsunemi, M. Kawasaki, J. W C McNabb, Y. Kondo, K. Hoshino, Toshiyuki Takahashi, H. Kanda, J. T. Yang, K. Oyama, Hirotaka Takahashi, J. T. Rhee, P.K. Saha, Junji Tojo, Y. Nagase, S. J. Kim, H. M. Park, N. Ushida, H. Torii, K. Arai, Y. H. Iwata, H. Shibuya, A. K. Ichikawa, J. Parker, C. S. Yoon, Tomoko Yoshida, Fujio Takeutchi, Seok Kim, T. Watanabe, C.J. Yoon, and D.N. Tovee

Subjects
Rest (physics), Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Event (relativity), Hadron, Hyperon, Nuclear fusion
Abstract

An event emitting a Σ- -hyperon from a Ξ- -hyperon nuclear capture at rest has been observed in a hybrid-emulsion experiment. The event has been analyzed as the first observation of the weak decay of the S = - 2 system.

Published
2007

4. Measurement of the TeV atmospheric muon charge ratio with the complete OPERA data set

Author

N. Agafonova, A. Aleksandrov, A. Anokhina, S. Aoki, A. Ariga, T. Ariga, D. Bender, A. Bertolin, C. Bozza, R. Brugnera, A. Buonaura, S. Buontempo, B. Büttner, M. Chernyavsky, A. Chukanov, L. Consiglio, N. D’Ambrosio, G. De Lellis, M. De Serio, P. Del Amo Sanchez, A. Di Crescenzo, D. Di Ferdinando, N. Di Marco, S. Dmitrievski, M. Dracos, D. Duchesneau, S. Dusini, T. Dzhatdoev, J. Ebert, A. Ereditato, R. A. Fini, T. Fukuda, G. Galati, A. Garfagnini, G. Giacomelli, C. Göllnitz, J. Goldberg, Y. Gornushkin, G. Grella, M. Guler, C. Gustavino, C. Hagner, T. Hara, A. Hollnagel, B. Hosseini, H. Ishida, K. Ishiguro, K. Jakovcic, C. Jollet, C. Kamiscioglu, M. Kamiscioglu, J. Kawada, J. H. Kim, S. H. Kim, N. Kitagawa, B. Klicek, K. Kodama, M. Komatsu, U. Kose, I. Kreslo, A. Lauria, J. Lenkeit, A. Ljubicic, A. Longhin, P. Loverre, A. Malgin, M. Malenica, G. Mandrioli, T. Matsuo, V. Matveev, N. Mauri, E. Medinaceli, A. Meregaglia, S. Mikado, P. Monacelli, M. C. Montesi, K. Morishima, M. T. Muciaccia, N. Naganawa, T. Naka, M. Nakamura, T. Nakano, Y. Nakatsuka, K. Niwa, S. Ogawa, N. Okateva, A. Olshevsky, T. Omura, K. Ozaki, A. Paoloni, B. D. Park, I. G. Park, L. Pasqualini, A. Pastore, L. Patrizii, H. Pessard, C. Pistillo, D. Podgrudkov, N. Polukhina, M. Pozzato, F. Pupilli, M. Roda, H. Rokujo, T. Roganova, G. Rosa, O. Ryazhskaya, O. Sato, A. Schembri, I. Shakiryanova, T. Shchedrina, A. Sheshukov, H. Shibuya, T. Shiraishi, G. Shoziyoev, S. Simone, M. Sioli, C. Sirignano, G. Sirri, M. Spinetti, L. Stanco, N. Starkov, S. M. Stellacci, M. Stipcevic, P. Strolin, S. Takahashi, M. Tenti, F. Terranova, V. Tioukov, S. Tufanli, P. Vilain, M. Vladimirov, L. Votano, J. L. Vuilleumier, G. Wilquet, B. Wonsak, C. S. Yoon, S. Zemskova, and A. Zghiche

Subjects
Physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Detector, Cosmic ray, 01 natural sciences, symbols.namesake, Pion, Magnet, 0103 physical sciences, symbols, Feynman diagram, High Energy Physics::Experiment, 010306 general physics, Nucleon, Engineering (miscellaneous), Scaling
Abstract

The OPERA detector, designed to search for $\nu_{\mu} \to \nu_{\tau}$ oscillations in the CNGS beam, is located in the underground Gran Sasso laboratory, a privileged location to study TeV-scale cosmic rays. For the analysis here presented, the detector was used to measure the atmospheric muon charge ratio in the TeV region. OPERA collected charge-separated cosmic ray data between 2008 and 2012. More than 3 million atmospheric muon events were detected and reconstructed, among which about 110000 multiple muon bundles. The charge ratio $R_{\mu} \equiv N_{\mu^+}/N_{\mu^-}$ was measured separately for single and for multiple muon events. The analysis exploited the inversion of the magnet polarity which was performed on purpose during the 2012 Run. The combination of the two data sets with opposite magnet polarities allowed minimizing systematic uncertainties and reaching an accurate determination of the muon charge ratio. Data were fitted to obtain relevant parameters on the composition of primary cosmic rays and the associated kaon production in the forward fragmentation region. In the surface energy range 1-20 TeV investigated by OPERA, $R_{\mu}$ is well described by a parametric model including only pion and kaon contributions to the muon flux, showing no significant contribution of the prompt component. The energy independence supports the validity of Feynman scaling in the fragmentation region up to $200$ TeV/nucleon primary energy.

Published
2014

5. Molecular dynamic simulation of amorphous carbon and graphite interface

Author

C. S. Yoon and J. Megusar

Subjects
Materials science, chemistry.chemical_element, Nanotechnology, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Stress (mechanics), Molecular dynamics, Amorphous carbon, chemistry, Chemical physics, General Materials Science, Graphite, Structural rigidity, High-resolution transmission electron microscopy, Pair potential, Carbon
Abstract

Amorphous carbon/graphite interface is modeled by molecular dynamic simulation using a Tersoff-type potential function with the Brenner parameters for in-plane interaction combined with the pair potential function for the interplanar bonding. The interface is created by compressing the amorphous carbon produced in a separate simulation with perfect crystalline graphite terminated to expose (1120) planes. The planar structure and weak interplanar bonding allow the graphitic planes to deform in order to accommodate the bonds formed at the interface, which is consistent with the HRTEM study of the interface. The simulation indicates that the generated interface mostly consists of nearly sp2 hybridized bonding connecting the two sides. The bonds across the interface when formed are likely to maintain their equilibrium configurations. Due to the large interplanar spacing, many atoms both on the graphite and a-C sides are left unbonded leaving the interface energetically unfavorable with respect to the bulk. These unbonded radicals probably weaken the structural rigidity of the interface providing a fracture path under stress.

Published
1995

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