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33 results on '"F. SUEKANE"'

1. Laboratory studies on the removal of radon-born lead from KamLAND׳s organic liquid scintillator

Author

R. D. McKeown, Hiroshi Ogawa, M. P. Decowski, Yuri Kamyshkov, D. McKee, G. Keefer, T. Miletic, Stuart J. Freedman, J. Maricic, Osamu Tajima, Z. Djurcic, K. Tamae, John G. Learned, C. E. Lane, Kunio Inoue, S. Yoshida, D. A. Dwyer, K. Tolich, Y. Takemoto, B. E. Berger, Kyo Nakajima, J. S. Ricol, M. Ogawa, B. K. Fujikawa, M. Motoki, H. Ikeda, T. Iwamoto, Yasuhiro Kishimoto, Giorgio Gratta, K. Nakajima, Lindley Winslow, K. M. Heeger, Yu. Efremenko, Sakae Takeuchi, I. Shimizu, Chao Zhang, S. Matsuno, M. Koga, Koichi Ichimura, C. Grant, Y. Koseki, S. Hatakeyama, A. Kozlov, C. Mauger, Sanshiro Enomoto, Leon Hsu, K. Furuno, Y. Kibe, Hugon J Karwowski, J. Shirai, S. Dazeley, T. Ebihara, George K. Schweitzer, J. A. Detwiler, A. Piepke, A. Suzuki, R. Svoboda, T. O׳Donnell, T. Mitsui, Hideki Watanabe, Y. Gando, D. M. Markoff, A. Gando, Hiroko Watanabe, F. Suekane, K. Nakamura, F. Piquemal, Werner Tornow, and GRAPPA (ITFA, IoP, FNWI)

Subjects
Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Radiochemistry, Radon Decay Products, FOS: Physical sciences, chemistry.chemical_element, Radon, Instrumentation and Detectors (physics.ins-det), Scintillator, High Energy Physics - Experiment, respiratory tract diseases, law.invention, 85-05, Nuclear physics, High Energy Physics - Experiment (hep-ex), chemistry, law, Extraction methods, Nuclear Experiment (nucl-ex), Nuclear Experiment, Instrumentation, Distillation
Abstract

The removal of radioactivity from liquid scintillator has been studied in preparation of a low background phase of KamLAND. This paper describes the methods and techniques developed to measure and efficiently extract radon decay products from liquid scintillator. We report the radio-isotope reduction factors obtained when applying various extraction methods. During this study, distillation was identified as the most efficient method for removing radon-born lead from liquid scintillator.

Published
2015
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2. Background-independent measurement of θ13 in Double Chooz

Author

Z. Djurcic, A. Stahl, M. Kuze, Christian Buck, B. Rybolt, J. Spitz, J. Maricic, Amanda Porta, H. de Kerret, D. Dietrich, R. Santorelli, J. M. López-Castaño, I. M. Pepe, P. Chimenti, Muriel Fallot, P. Novella, C. Grant, Yuri Kamyshkov, T. Matsubara, Y. Sakamoto, L. B. Bezrukov, M. Franke, J. Haser, A.C. Schilithz, V. Zimmer, A. Cucoanes, Florian Kaether, P.-J. Chang, I. Bekman, J. Felde, D. Franco, R. Carr, R. Sharankova, E. Kemp, N. Vassilopoulos, C. Mariani, J. C. dos Anjos, A.V. Etenko, J.V. Dawson, A. Minotti, Yoshio Abe, Josef Jochum, V. Sibille, J. M. LoSecco, M. D. Skorokhvatov, Michael Wurm, H. Watanabe, A. Stüken, F. Sato, F. von Feilitzsch, C. Palomares, I. Gil-Botella, A. Hourlier, Lydie Giot, Audrey Letourneau, E. Damon, M. Röhling, M. Vivier, D. Kryn, Sebastian Wagner, Anselmo Meregaglia, Y. Nikitenko, Daniel M. Kaplan, G. Yang, Marcos Cerrada, M. Elnimr, Manfred Lindner, H. P. Lima, Antoine Collin, J. Reichenbacher, Robert Svoboda, Eric Baussan, S. M. Fernandes, V. V. Sinev, Bayarto Lubsandorzhiev, Marcos Dracos, S. Schönert, T. Sumiyoshi, J. Busenitz, Kazuhiro Terao, Stefan Schoppmann, David Lhuillier, Lothar Oberauer, Thierry Lasserre, G. Mention, J. C. Barriere, L. Camilleri, M. Göger-Neff, M. Obolensky, S. Shimojima, Anatael Cabrera, F. Yermia, Christopher Wiebusch, G. A. Valdiviesso, I. Stancu, Michael Hofmann, Cécile Jollet, B. Reinhold, G. A. Horton-Smith, L. N. Kalousis, T.J.C. Bezerra, Matthew L Strait, H. H. Trinh Thi, M. C. Goodman, S. Roth, Yasushi Nagasaka, H. Furuta, M. H. Shaevitz, E. Conover, G. Pronost, A. Onillon, T. Kawasaki, S. Perasso, S. V. Sukhotin, A. Osborn, E. Smith, J. Maeda, J. Martino, N. Haag, Luis González, L. Goodenough, A. Tonazzo, E. Blucher, T. Miletic, Janet Conrad, R. Milincic, T. Konno, F. Suekane, L.F.F. Stokes, Tobias Lachenmaier, K. Nakajima, R. Roncin, Ying Sun, T. Hara, M. Bergevin, K. Crum, J. I. Crespo-Anadón, V. Fischer, S. Lucht, E. Chauveau, E. Caden, Masaki Ishitsuka, Lindley Winslow, P. Pfahler, C. E. Lane, and C. Veyssiere

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Oscillation, CHOOZ, 7. Clean energy, 01 natural sciences, Nuclear physics, 13. Climate action, 0103 physical sciences, Modulation (music), Neutron, Neutrino, 010306 general physics, Neutrino oscillation, Charged current, Mixing (physics)
Abstract

The oscillation results published by the Double Chooz Collaboration in 2011 and 2012 rely on background models substantiated by reactor-on data. In this analysis, we present a background-model-independent measurement of the mixing angle θ13 by including 7.53 days of reactor-off data. A global fit of the observed antineutrino rates for different reactor power conditions is performed, yielding a measurement of both θ13 and the total background rate. The results on the mixing angle are improved significantly by including the reactor-off data in the fit, as it provides a direct measurement of the total background rate. This reactor rate modulation analysis considers antineutrino candidates with neutron captures on both Gd and H, whose combination yields sin2(2θ13)=0.102±0.028(stat.)±0.033(syst.). The results presented in this study are fully consistent with the ones already published by Double Chooz, achieving a competitive precision. They provide, for the first time, a determination of θ13 that does not depend on a background model.

Published
2014
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3. A global fit determination of effective Δm312 from baseline dependence of reactor ν¯e disappearance

Author

H. Furuta, F. Suekane, T. Matsubara, and T.J.C. Bezerra

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, MINOS, Daya bay, Reactor neutrino, Neutrino, CHOOZ, Atmospheric neutrino, Neutrino oscillation
Abstract

Recently, three reactor neutrino experiments, Daya Bay, Double Chooz and RENO have directly measured the neutrino mixing angle θ 13 . In this Letter, another important oscillation parameter, effective Δ m 31 2 ( = Δ m ˜ 31 2 ) is measured using baseline dependence of the reactor neutrino disappearance. A global fit is applied to publicly available data and Δ m ˜ 31 2 = 2.95 − 0.61 + 0.42 × 10 − 3 eV 2 , sin 2 2 θ 13 = 0.099 − 0.012 + 0.016 are obtained by setting both parameters free. This result is complementary to Δ m ˜ 31 2 to be measured by spectrum shape analysis. The measured Δ m ˜ 31 2 is consistent with Δ m ˜ 32 2 measured by ν μ disappearance in MINOS, T2K and atmospheric neutrino experiments within errors. The minimum χ 2 is small, which means the results from the three reactor neutrino experiments are consistent with each other.

Published
2013
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4. First measurement of θ13 from delayed neutron capture on hydrogen in the Double Chooz experiment

Author

J. Maricic, A. Onillon, S. Roth, S. M. Fernandes, J. M. LoSecco, Anselmo Meregaglia, A. Hatzikoutelis, Masahiro Kuze, Th. A. Mueller, R. Santorelli, H. H. Trinh Thi, L. Camilleri, T. Hayakawa, J. Tm. Goon, V. V. Sinev, W. Potzel, M. Franke, I. M. Pepe, P. Chimenti, Matthew L Strait, T. Konno, I. Gil-Botella, Z. Djurcic, T. Matsubara, M. Fechner, Robert Svoboda, R. Roncin, Ying Sun, F. Suekane, L.F.F. Stokes, J. M. López-Castaño, Michael Hofmann, M. Toups, G. Keefer, Muriel Fallot, T. Classen, Steven Dazeley, H. P. Lima, A.V. Etenko, D. Kryn, J.V. Dawson, Amanda Porta, M. Röhling, T. Hara, M. Elnimr, J. Busenitz, R. Carr, Florian Kaether, M. Worcester, J. Felde, D. Franco, I. Stancu, D. Greiner, H. Furuta, B. White, H. de Kerret, Stefan Schoppmann, A. Remoto, C. Aberle, A. Cucoanes, M. Göger-Neff, G. Mention, E. Damon, S. Perasso, J. Ebert, Sebastian Wagner, Manfred Lindner, F. Hartmann, C. Mariani, Antoine Collin, E. Blucher, Josef Jochum, Yasushi Nagasaka, V. Durand, Daniel M. Kaplan, I. Ostrovskiy, P. Novella, L. Bezrukhov, F. von Feilitzsch, G. Pronost, K. Nakajima, Cécile Jollet, B. Reinhold, C. Langbrandtner, Tobias Lachenmaier, Adam Bernstein, P. Perrin, J. Maeda, L. Goodenough, Lothar Oberauer, A. Letourneau, A. Tonazzo, P. Pfahler, C. E. Lane, V. Zimmer, T. Kawasaki, S. Lucht, V. Fischer, R. Milincic, T. Sumiyoshi, E. Caden, A. J. Franke, J. Martino, M. Bergevin, Masaki Ishitsuka, Lindley Winslow, K. Crum, A. Osborn, A. Stahl, J. L. Sida, J. I. Crespo-Anadón, J. Reichenbacher, J. C. dos Anjos, A. Stüken, F. Sato, Yoshio Abe, C. Veyssiere, D. Shrestha, Yuri Kamyshkov, D. McKee, J. Spitz, P.-J. Chang, Marcos Cerrada, Yu. Efremenko, Caren Hagner, M. D. Skorokhvatov, Michael Wurm, H. Watanabe, M. Obolensky, L. N. Kalousis, T.J.C. Bezerra, R. Gama, Bayarto Lubsandorzhiev, Thierry Lasserre, J. C. Barriere, Manuel Meyer, Marcos Dracos, S. V. Sukhotin, E. Smith, N. Haag, Anna Erickson, J. Haser, T. Miletic, S. Habib, D. Lhuillier, Y. Sakamoto, F. Yermia, Anatael Cabrera, E. Conover, C. L. Jones, M. H. Shaevitz, A. Hourlier, Lydie Giot, E. Kemp, S. Schönert, S. Shimojima, G. A. Horton-Smith, Luis González, Nathaniel Bowden, Thomas Schwetz, Janet Conrad, C. Palomares, Kazuhiro Terao, Christopher Wiebusch, G. A. Valdiviesso, M. C. Goodman, H. Miyata, Christian Buck, B. Rybolt, C. N. Maesano, and D. Dietrich

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Flux, Photon energy, CHOOZ, 01 natural sciences, Nuclear physics, Neutron capture, Inverse beta decay, 0103 physical sciences, 010306 general physics, Neutrino oscillation, Delayed neutron, Charged current
Abstract

The Double Chooz experiment has determined the value of the neutrino oscillation parameter $\theta_{13}$ from an analysis of inverse beta decay interactions with neutron capture on hydrogen. This analysis uses a three times larger fiducial volume than the standard Double Chooz assessment, which is restricted to a region doped with gadolinium (Gd), yielding an exposure of 113.1 GW-ton-years. The data sample used in this analysis is distinct from that of the Gd analysis, and the systematic uncertainties are also largely independent, with some exceptions, such as the reactor neutrino flux prediction. A combined rate- and energy-dependent fit finds $\sin^2 2\theta_{13}=0.097\pm 0.034(stat.) \pm 0.034 (syst.)$, excluding the no-oscillation hypothesis at 2.0 \sigma. This result is consistent with previous measurements of $\sin^2 2\theta_{13}$.

Published
2013
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5. Application of Reactor Antineutrinos: Neutrinos for Peace

Author

F. Suekane

Subjects
Physics, Nuclear and High Energy Physics, Nuclear fuel, Explosive material, Atomic energy, chemistry.chemical_element, Thermal power station, Nuclear weapon, Atomic and Molecular Physics, and Optics, Plutonium, Nuclear physics, Safeguard, chemistry, Physics::Chemical Physics, Neutrino
Abstract

In nuclear reactors, 239Pu are produced along with burn-up of nuclear fuel. 239Pu is subject of safeguard controls since it is an explosive component of nuclear weapon. International Atomic Energy Agency (IAEA) is watching undeclared operation of reactors to prevent illegal production and removal of 239Pu. In operating reactors, a huge numbers of anti electron neutrinos ( ν ¯ e ) are produced. Neutrino flux is approximately proportional to the operating power of reactor in short term and long term decrease of the neutrino flux per thermal power is proportional to the amount of 239Pu produced. Thus rector ν ¯ e ʼs carry direct and real time information useful for the safeguard purposes. Since ν ¯ e can not be hidden, it could be an ideal medium to monitor the reactor operation. IAEA seeks for novel technologies which enhance their ability and reactor neutrino monitoring is listed as one of such candidates. Currently neutrino physicists are performing R&D of small reactor neutrino detectors to use specifically for the safeguard use in response to the IAEA interest. In this proceedings of the neutrino2012 conference, possibilities of such reactor neutrinos application and current world-wide R&D status are described.

Published
2013
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6. Reactor Neutrino Oscillations: KamLAND and KASKA

Author

F. Suekane

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, business.industry, Oscillation, Solar neutrino, Solar neutrino problem, Nuclear power, Atomic and Molecular Physics, and Optics, Physics::Geophysics, Nuclear physics, Neutrino detector, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, business, Neutrino oscillation
Abstract

Nuclear reactors generate a huge number of low energy ν ¯ e 's . The reactor neutrinos have been used to study properties of neutrinos since its discovery a half century ago. Recently, KamLAND group finally discovered reactor neutrino oscillation with average baseline 180 km. According to the 3 flavor scheme of standard theory and measured oscillation parameters so far, the reactor neutrino is expected to perform another type of small oscillation at a baseline 1.8 km. KASKA experiment is a project to detect this small oscillation and to measure the last neutrino mixing angle θ 13 by using the world most powerful reactor complex, Kashiwazaki-Kariwa nuclear power station. In this proceedings, phenomena of neutrino oscillation and the two reactor oscillation experiments, KamLAND and KASKA, are introduced.

Published
2006
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7. Prospects of reactor neutrino experiments

Author

F. Suekane

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Oscillation, Solar neutrino, Measurements of neutrino speed, Reactor neutrino, Solar neutrino problem, CHOOZ, Neutrino, Neutrino oscillation
Abstract

Since the energy of a reactor neutrino is a few MeV, all Δ m 12 2 , Δ m 23 2 and Δ m 13 2 oscillations are accessible by reactor neutrino experiments. KamLAND observed the Δ m 12 2 oscillation and currently Double Chooz, RENO and Dayabay experiments are under construction aiming to detect Δ m 13 2 + Δ m 23 2 oscillation. There are still good prospects for future reactor neutrino experiments after them. For example, there is room to further improve sin 2 2 θ 13 accuracy at a baseline of ∼1.5 km, a very precise sin 2 2 θ 12 measurement and the determination of mass hierarchy may be possible at a baseline ∼50 km, and if KamLAND is enlarged to the SuperKamiokande size, better measurement of Δ m 12 2 and sin 2 2 θ 12 will be anticipated. It is important to take into account such possibilities when planning future neutrino program after θ 13 is measured by current experiments.

Published
2010
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8. Measurements of R=σL/σT for 0.03<x<0.1 and fit to world data

Author

P. Raines, Ingo Sick, S.St. Lorant, D. Kawall, H. Borel, H. Tang, C. Y. Prescott, J. M. Bauer, H. R. Band, R. G. Arnold, F. S. Dietrich, L. M. Stuart, T. Maruyama, Ch. Hyde-Wright, D. Walz, J. L. White, J. S. McCarthy, P. E. Bosted, G. Court, T. Averett, Vincent Breton, P. Grenier, B. Raue, Kevin P. Coulter, S. Hoibraten, Pascal Steiner, R. Erbacher, F. Staley, D. Reyna, O. Rondon, P.L. Anthony, K. A. Griffioen, A. Feltham, E. W. Hughes, D. Crabb, J. Button-Shafer, R. Prepost, S. E. Rock, Timothy Chupp, A. Rijllart, J. Gomez, Timothy B. Smith, Y. Terrien, J. A. Dunne, L. C. Smith, K. Witte, T. L. Usher, W. Meyer, C. C. Young, J. Fellbaum, J. R. Johnson, D. Zimmermann, Avraham Klein, J. Morgenstern, M. Kuriki, Y. Roblin, Donal Day, Z. E. Meziani, F. Suekane, J. P. Chen, H. Dutz, R. C. Minehart, B. Zihlmann, Emil Frlez, B. Youngman, Koji Abe, R. Antonov, R. M. Lombard-Nelsen, H. Fonvieille, L. S. Rochester, R. A. Lindgren, G. G. Petratos, R. Gearhart, J. Marroncle, F.R. Wesselmann, John C. Mitchell, H. Yuta, G. H. Zapalac, R. Pitthan, J. Clendenin, T. J. Liu, Dinko Pocanic, S. E. Kuhn, Z. M. Szalata, T. Akagi, M. Spengos, X.K. Maruyama, D. Garvey, C. Comptour, and M. Daoudi

Subjects
Physics, Nuclear and High Energy Physics, Cross section.transverse, 010308 nuclear & particles physics, Scattering, chemistry.chemical_element, Electron, 01 natural sciences, Nuclear physics, Cross section (physics), chemistry, 0103 physical sciences, 010306 general physics, Carbon
Abstract

Measurements were made at SLAC of the cross section for scattering 29 GeV electrons from carbon at a laboratory angle of 4.5°, corresponding to 0.03

Published
1999
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9. Initial impact parameter resolution of the new SLD vertex detector

Author

K Skarpaas Viii, J. Huber, D. N. Dong, V. Lia, M.G Strauss, A. Chou, S.S Hertzbach, I. Lee, M. Foss, Su Dong, S. Manly, A.L. Lintern, J. Kelsey, G. Crawford, A. Nichols, A. I. Trandafir, J. Hoeflich, R.L. English, Tadashi Nagamine, Stephen Watts, A. Arodzero, J. A. Jaros, D. Ross, J. Sinnott, G. H. Zapalac, A. K. McKemey, T. B. Moore, Minghui Liu, F. Suekane, Gunther Haller, E. Etzion, Martin Breidenbach, N. B. Sinev, V. V. Serbo, N. Oishi, C. Baltay, H. Masuda, M. E. Huffer, E. R. Weiss, C.J.S. Damerell, W. T. Emmet, J. Yashima, P.J. Dervan, F. E. Taylor, K. Hasuko, R. Verdier, J. J. Russell, Koji Abe, L.S. Osborne, J. E. Brau, H. Yuta, M. B. Smy, R. Frey, T. L. Usher, J. A. Snyder, D. J. Jackson, and P. N. Burrows

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, business.industry, Detector, Resolution (electron density), Particle accelerator, Particle detector, law.invention, Data acquisition, Optics, Upgrade, law, High Energy Physics::Experiment, Electronics, Impact parameter, business, Instrumentation
Abstract

During 1996 the SLD collaboration completed the construction of, and began the operation of, a new vertex detector (VXD3). This detector, based on 96 CCD’s each of 13 cm 2 area, is an upgrade of the original vertex detector of SLD (VXD2), and is made possible by advances in the technology of CCD detectors. New front-end electronics and a new data acquisition system were developed for this upgrade. Its improved characteristics will enhance many SLD measurements, and open the possibility to observe B s 0 -mixing. More than 50 000 Z events obtained with the new vertex detector have been analyzed. Results on the new detector performance (including resolution evaluation) from this first data are presented.

Published
1998
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10. A study of energy resolution in a gridded ionization chamber filled with tetramethylsilane and tetramethylgermanium

Author

H. Hara, H. Yuta, K. Abe, M. Neichi, Y. Hoshi, F. Suekane, H. Ohnuma, Kimiaki Masuda, and T. Nakajima

Subjects
Radiation, Electron lifetime, Ion yield, Resolution (electron density), Analytical chemistry, Electron, chemistry.chemical_compound, Thermalisation, chemistry, Ionization chamber, Atomic physics, Instrumentation, Tetramethylsilane, Energy (signal processing)
Abstract

The energy resolutions of 976 keV conversion electrons from a 207 Bi source are measured in a gridded ionization chamber filled with tetramethylsilane (TMS) and tetramethylgermanium (TMG), and are found to be about 5.7 and 5.5% (rms) for TMS and TMG, respectively. We also deduce a simple method of estimating the electron lifetime using a gridded ionization chamber. The electron lifetime, free ion yield and thermalization length for these liquids are measured by this simple method.

Published
1998
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11. Design and performance of the SLD vertex detector: a 307 Mpixel tracking system

Author

J. Sinnott, M. Foss, W. T. Emmet, Su Dong, P.J. Dervan, M. G. Strauss, K. Hasuko, D. N. Dong, J. J. Russell, L.S. Osborne, F. E. Taylor, J. A. Snyder, I. Lee, Tadashi Nagamine, S. Manly, A. Chou, G. H. Zapalac, Martin Breidenbach, A. I. Trandafir, C.J.S. Damerell, E. R. Weiss, J. Kelsey, R. Verdier, R. Frey, N. Oishi, Stephen Watts, A. Arodzero, S. S. Hertzbach, N. B. Sinev, K Skarpaas Viii, G. Crawford, H. Yuta, D. Ross, M. E. Huffer, J. Yashima, J. A. Jaros, M. B. Smy, A.L. Lintern, A. K. McKemey, T. L. Usher, V. V. Serbo, Gunther Haller, R.L. English, P. N. Burrows, T. B. Moore, D. J. Jackson, Minghui Liu, F. Suekane, C. Baltay, H. Masuda, E. Etzion, J. E. Brau, J. Hoeflich, A. Nichols, V. Lia, and K. Abe

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Vertex (computer graphics), Signal processing, Pixel, Physics::Instrumentation and Detectors, business.industry, Detector, Tracking system, Signal, law.invention, Optics, law, High Energy Physics::Experiment, Point (geometry), Collider, business, Instrumentation
Abstract

This paper describes the design, construction, and initial operation of SLD's upgraded vertex detector which comprises 96 two-dimensional charge-coupled devices (CCDs) with a total of 307 Mpixel. Each pixel functions as an independent particle detecting element, providing space point measurements of charged particle tracks with a typical precision of 4 μm in each co-ordinate. The CCDs are arranged in three concentric cylinders just outside the beam-pipe which surrounds the e+e− collision point of the SLAC Linear Collider (SLC). The detector is a powerful tool for distinguishing displaced vertex tracks, produced by decay in flight of heavy flavour hadrons or tau leptons, from tracks produced at the primary event vertex. The requirements for this detector include a very low mass structure (to minimize multiple scattering) both for mechanical support and to provide signal paths for the CCDs; operation at low temperature with a high degree of mechanical stability; and high speed CCD readout, signal processing, and data sparsification. The lessons learned in achieving these goals should be useful for the construction of large arrays of CCDs or active pixel devices in the future in a number of areas of science and technology.

Published
1997
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12. The SLD VXD3 detector and its initial performance

Author

Gunther Haller, Stephen Watts, Su Dong, D. Ross, K. Abe, C.J.S. Damerell, M. E. Huffer, J. Yashima, A. Chou, K Skarpaas Viii, T. L. Usher, J. A. Snyder, T. B. Moore, J. Sinnott, R. Frey, E. Etzion, A. I. Trandafir, M. Foss, W. T. Emmet, H. Yuta, K. Hasuko, I. Lee, J. Hoeflich, J. J. Russell, J. Kelsy, L.S. Osborne, Minghui Liu, P. N. Burrows, C. Baltay, H. Masuda, A. Arodzero, M. B. Smy, E. R. Weiss, R.L. English, F. Suekane, P.J. Dervan, V. V. Serbo, G. H. Zapalac, Martin Breidenbach, D. J. Jackson, F. E. Taylor, Tadashi Nagamine, V. Lia, N. B. Sinev, G. Crawford, R. Verdier, S. Manly, L. Lintern, J. A. Jaros, J. Huber, M. G. Strauss, D. N. Dong, N. Ohishi, S. S. Hertzbach, Henry W. Kendall, and J. E. Brau

Subjects
Physics, Nuclear and High Energy Physics, Vertex (computer graphics), Upgrade, Optics, Pixel, business.industry, Detector, Beam direction, Vertex detector, business, Tracking (particle physics), Instrumentation
Abstract

The SLD collaboration completed construction of a new CCD vertex detector (VXD3) in January 1996 and started data taking in April 1996 with the new system. VXD3 is an upgrade of the original CCD vertex detector, VXD2, which had successfully operated in SLD for three years. VXD3 consists of 96 large area CCDs, each having 3.2 million 20 μm × 20 μm pixels. By reducing the detector material and lengthening the lever arm, VXD3 is expected to improve secondary vertex resolution by about a factor of two compared with VXD2. The new three-layered structure enables stand-alone tracking without any ambiguity and its extended size along the beam direction improves the polar-angle coverage to |cos θ| < 0.85. An overview of this detector system and its initial performance are described.

Published
1997
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13. Obtaining physics results from the SLD CRID

Author

Robert Wilson, J. A. Coller, M Nussbaum, G. Hallewell, T. Bienz, P. Antilogus, W. Dunwoodie, A.K.S. Santha, R. Ben-David, J. S. Whitaker, R. A. Johnson, P.E. Rensing, Kazuo Hasegawa, T. Nagamine, D.C. Schultz, S. Willocq, P. Stamer, A. Bean, B. N. Ratcliff, Yeong-Dae Kwon, G Müller, D. Aston, J. Va'vra, J Snyder, M. Cavalli-Sforza, K. Abe, K.G. Baird, David A. Williams, Yukio Hasegawa, J. D. Turk, D. W. G. S. Leith, F. Suekane, Brian Meadows, E. P. Solodov, S. H. Williams, N. Toge, H. Yuta, D. G. Coyne, L. Mathys, S. Dasu, S. L. Shapiro, Y. Iwasaki, J. Huber, C. Simopoulos, C. Baltay, I. Stockdale, S. Manly, A. Lu, F. Bird, G. B. Word, James Shank, Dominik Müller, S. J. Yellin, S. Sen, M. Kalelkar, S. McHugh, David O. Caldwell, P.F. Jacques, H. Kawahara, T.J. Pavel, J. Duboscq, S. Narita, R.J. Plano, A.B. d'Oliveira, P. Coyle, X. Liu, J. Martinez, and M. Dima

Subjects
Nuclear physics, Momentum, Physics, Nuclear and High Energy Physics, Particle physics, law, Likelihood ratio method, Measuring instrument, Particle accelerator, Instrumentation, Particle detector, Particle identification, law.invention
Abstract

We describe the likelihood ratio method used for particle identification in the SLD CRID, which allows the use of the entire momentum range covered by the liquid and gas radiators, including the threshold regions. Its application to two preliminary physics analyses is also described.

Published
1996
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14. Operational status and performance of the SLD CRID

Author

S. Willocq, M. Cavalli-Sforza, J Snyder, P. Coyle, F. Suekane, Brian Meadows, Robert Wilson, S. Dasu, C. Baltay, M. Dima, T. Bienz, J. A. Coller, Y. Iwasaki, G. Muller, R.J. Plano, S. L. Shapiro, W. Dunwoodie, A. Bean, J. S. Whitaker, R. A. Johnson, E. P. Solodov, T. Nagamine, J. D. Turk, D.C. Schultz, Yeong-Dae Kwon, Y. Hasegawa, A. Lu, P.F. Jacques, H. Yuta, L. Mathys, M. Kalelkar, G. Hallewell, M. Nussbaum, Kazuo Hasegawa, D. Aston, K.G. Baird, S. J. Yellin, R. Ben-David, S. Sen, J. Huber, David A. Williams, H. Kawahara, D. W. G. S. Leith, C. Simopoulos, P. E. Stamer, I. Stockdale, P.E. Rensing, F. Bird, S. McHugh, D. G. Coyne, D. O. Caldwell, S. H. Williams, N. Toge, T.J. Pavel, P. Antilogus, Dominik Müller, S. Manly, James Shank, A.K.S. Santha, A.B. d'Oliveira, G. B. Word, J. Duboscq, S. Narita, J. Va'vra, B. N. Ratcliff, X. Liu, J. Martinez, and K. Abe

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, law, Particle accelerator, Instrumentation, Transparency (behavior), Engineering physics, law.invention
Abstract

The operation and performance of the SLD CRID achieved during the recently completed 1994–1995 run of the SLC will be discussed. Stable operation of liquid (C6F14) and gas (85% C5F12 and 15% N2) radiators with good UV transparency has been achieved. Our expectations for the future SLD physics program will also be briefly discussed.

Published
1996
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15. Beam tests of the prototype level-1 trigger system and drift tubes with field-shapers proposed for the SDC barrel muon system

Author

J. Yajima, W. Higashioka, H. Ohyama, H. Akaishi, M. Shioden, Masaharu Nomachi, A. Ebata, T. Fukui, Ryusaburo Kikuchi, H. Iwasaki, Yoshio Arai, Y. Hoshi, Tianchi Zhao, N. Khalatyan, H. Yuta, H. Kawasaki, M. Kimura, Y. Tahara, M. Asai, K. Mitsuhashi, Hiroshi Sakamoto, Osamu Sasaki, F. Suekane, Y. Asano, A. Kimura, Tadashi Nagamine, Shigeki Mori, K. Abe, M. Abe, S. Kabe, Henry Lubatti, and Susumu Terada

Subjects
Physics, Nuclear and High Energy Physics, Muon, Field (physics), business.industry, Barrel (horology), Line (electrical engineering), Nuclear physics, Optics, Test beam, business, Instrumentation, Image resolution, Beam (structure), Muon detector
Abstract

Mini-tower beam tests were carried out at a test beam line of KEK-PS in order to study the performance of the prototype level-1 trigger system and drift tubes with field-shapers originally designed for the SDC barrel muon detector at the SSC. A mini-tower of 10 layers, 31 drift tubes in total, and a prototype level-1 trigger module were designed and fabricated for the tests. The spatial resolution of about 230 μm was obtained for the tubes. Relatively high rates of multi-pulse signals were observed for most of the tubes. The trigger module designed at KEK using a logic delta- T method was studied for various trigger logics and its performance was found to be very satisfactory.

Published
1995
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16. Measurements of the Q2-dependence of the proton and deuteron spin structure functions g1 and g1

Author

A. Rijllart, J. Marroncle, Z. M. Szalata, J. Clendenin, T. Akagi, P. Raines, H. Dutz, T. J. Liu, Dinko Pocanic, H. R. Band, M. Kuriki, J. P. Chen, John C. Mitchell, S. E. Kuhn, B. Youngman, R. Prepost, S.St. Lorant, D. Walz, G. Court, Ingo Sick, Timothy B. Smith, J. Gomez, X.K. Maruyama, D. Kawall, K. Witte, L. M. Stuart, T. Maruyama, P. E. Bosted, P.L. Anthony, J. Fellbaum, C. Comptour, M. Daoudi, C. E. Hyde-Wright, R. Pitthan, D. Garvey, C. Y. Prescott, W. Meyer, Avraham Klein, R. A. Lindgren, G. G. Petratos, M. Spengos, F. Staley, L.S. Rochester, C. C. Young, T. L. Usher, B. Raue, S. Hoibraten, R. C. Minehart, D. Zimmermann, Pascal Steiner, H. Yuta, P. Grenier, K. A. Griffioen, Timothy Chupp, L. C. Smith, F. Suekane, J. Morgenstern, J. R. Johnson, G. H. Zapalac, Donal Day, Y. Roblin, D. G. Crabb, H. Tang, J. Button-Shafer, Koji Abe, J. A. Dunne, H. Fonvieille, H. Borel, J. S. McCarthy, F. S. Dietrich, T. Averett, R. G. Arnold, R. Erbacher, Z. E. Meziani, D. Reyna, R. A. Gearhart, A. Feltham, E. W. Hughes, J. L. White, J. M. Bauer, Vincent Breton, Kevin P. Coulter, O. Rondon, S. E. Rock, Y. Terrien, B. Zihlmann, Emil Frlez, R. Antonov, and R. M. Lombard-Nelsen

Subjects
Nuclear physics, Physics, High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Deuterium, Proton, FOS: Physical sciences, Spin structure, High Energy Physics - Experiment
Abstract

The ratio g1/F1 has been measured over the range 0.031 (GeV/c)2. A trend is observed for g1/F1 to decrease at lower Q2. Fits to world data with and without a possible Q2-dependence in g1/F1 are in agreement with the Bjorken sum rule, but Delta_q is substantially less than the quark-parton model expectation., Comment: 16 pages, format is postscript file, gzip-ed, uuencode-ed

Published
1995
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17. Performance of the CRID at SLD

Author

Robert Wilson, Suliana Manley, G. Hallewell, D. W. G. S. Leith, S. McHugh, F. Suekane, A. Lu, James Shank, R.J. Plano, T. Bienz, J. Coller, P.E. Rensing, W. Dunwoodie, S. Dolinsky, P. Coyle, P. Antilogus, K. Hasegawa, J. S. Whitaker, R. A. Johnson, B. N. Ratcliff, G. Muller, A.K.S. Santha, Y. Hasegawa, D. Aston, S. Dasu, Y. Iwasaki, M. Kalelkar, Koya Abe, D. G. Coyne, X. Liu, F. Bird, B. Meadows, S. H. Williams, J. Va'vra, P. Stamer, Yeong-Dae Kwon, N. Toge, E. P. Solodov, J. D. Turk, H. Yuta, L. Mathys, K.G. Baird, David A. Williams, C. Simopoulos, S. J. Yellin, R. Ben-David, I. Stockdale, D.C. Schultz, G. B. Word, D.O. Caldwell, J. Huber, Dominik Müller, A. Bean, J. Duboscq, S. L. Shapiro, P.F. Jacques, Tadashi Nagamine, T.J. Pavel, M. Cavalli-Sforza, H. Kawahara, M.D. Sokoloff, A.B. d'Oliveira, J. A. Snyder, J. Martinez, and M. Nussbaum

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Ring (mathematics), law, Detector, Particle accelerator, Instrumentation, Cherenkov radiation, law.invention
Abstract

This paper describes the performance of a large 4π Cherenkov Ring Imaging Detector (CRID) in the SLD experiment at the SLC at SLAC. We compare the most recent SLD results with those obtained during the R&D period, discuss various design features, and highlight some specific lessons derived from three years of operation.

Published
1994
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18. Characteristics of an ionization chamber using tetramethylgermanium

Author

Nobuaki Kawamura, F. Suekane, Y. Hasegawa, Kazuo Hasegawa, Y. Iwasaki, H. Hanada, K. Neichi, H. Yuta, J. Katayama, Koji Abe, K. Suzuki, Ryusaburo Kikuchi, K. Ishimaru, Masato Higuchi, M. Kuriki, Kimiaki Masuda, T. Nakajima, Kazumasa Miyano, Y. Hoshi, H. Iso, and M. Sakamoto

Subjects
Physics, Nuclear and High Energy Physics, Yield (engineering), Electron lifetime, macromolecular substances, Radiation, law.invention, Magazine, law, Electrical resistivity and conductivity, Ionization, Ionization chamber, Irradiation, Atomic physics, Instrumentation
Abstract

The material compatibility and the radiation resistivity of liquid tetramethylgermanium have been examined by monitoring the ionization yield and the electron lifetime in a pulse ionization chamber. There is no deterioration of the liquid quality with hardened lead during one year. Irradiation with 1000 Gy of γ-rays causes some deterioration of the liquid. The electron lifetime for the damage liquid was almost restored to its initial value by repeating the purification several times.

Published
1993
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19. Production of 400 mirrors with high VUV reflectivity for use in the SLD Cherenkov ring imaging detector

Author

T. Bienz, W. Dunwoodie, Robert Wilson, J. S. Whitaker, R. A. Johnson, M. Nussbaum, A. Bean, P.E. Rensing, A. L. Shoup, Michael S. Witherell, J. Va'vra, J. Martinez, P. Datte, P. Coyle, G. Hallewell, J. Huber, S. Yellin, Koji Abe, P. Jacques, S. L. Shapiro, H. Kawahara, A. Lu, F. Suekane, J. Duboscq, P. Stamer, P. Antilogus, P. Gagnon, R. Plano, A.K.S. Santha, Dominik Müller, David A. Williams, C. Simopoulos, D. W. G. S. Leith, R. J. Morrison, T.J. Pavel, Kazuo Hasegawa, S. McHugh, David O. Caldwell, Y. Kwon, M. Hilton, S. H. Williams, N. Toge, D. L. Hale, D. G. Coyne, B. N. Ratcliff, E. P. Solodov, H. Yuta, L. Mathys, I. Stockdale, T. Nagamine, D.C. Schultz, D. Aston, and F. Bird

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, business.industry, Scattering, Cherenkov detector, Detector, Ray, law.invention, Optics, law, Distortion, Surface roughness, Physics::Accelerator Physics, Optoelectronics, business, Collider, Instrumentation, Cherenkov radiation
Abstract

The Stanford Large Detector for experimental particle physics detection at the SLAC Linear Collider contains a Cherenkov ring imaging detector (CRID). The barrel CRID mirrors have been successfully produced and installed. The industrial mirror production process, the quality control of the mirrors produced, and the results of the vacuum ultraviolet (VUV) reflectivity and mirror-shape accuracy are described. An average reflectivity of at least 80% for light at 160 nm and 85% for light in the 180–230 nm wavelength range has been achieved in the production of over 400 mirrors of a typical size of 30 by 30 cm. The surface roughness and optical distortion measurements imply that the light loss due to scattering is a few percent of the incident light and the angular error due to shape distortion is less than 1 mrad.

Published
1991
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20. Monitor and control systems for the SLD Cherenkov ring-imaging detector

Author

Robert Wilson, S. Dasu, K. Hasegawa, P. Zucchelli, M.D. Sokoloff, Randall P. Johnson, A. Lu, G. Hallewell, B. Meadows, D. G. Coyne, M. Cavalli-Sforza, J. Martinez, Koya Abe, C. Simopoulos, P. Coyle, J. Va'vra, T. Bienz, P. Stamer, M. Nussbaum, W. Dunwoodie, S. McHugh, Michael S. Witherell, J. S. Whitaker, L. Rabinowitz, P. Antilogus, F. Fernandez, P. Gagnon, David O. Caldwell, H. Kawahara, P. Korff, J. Duboscq, S. Yellin, E. P. Solodov, David A. Williams, T.J. Pavel, S. Attanagoda, H. Yuta, L. Mathys, B. N. Ratcliff, S. L. Shapiro, F. Suekane, P.E. Rensing, A. Bean, I. Stockdale, R. J. Morrison, S. H. Williams, N. Toge, F. Bird, D. W. G. S. Leith, R. Plano, J. Huber, T. Nagamine, D.C. Schultz, D. Aston, A. L. Shoup, Dominik Müller, P. Jacques, and Y. Kwon

Subjects
Physics, Nuclear and High Energy Physics, Optical fiber, Physics::Instrumentation and Detectors, business.industry, Pressure control, Detector, Particle detector, Linear particle accelerator, law.invention, Optics, Data acquisition, law, Measuring instrument, business, Instrumentation, Cherenkov radiation
Abstract

To help ensure the stable long-term operation of a Cherenkov ring-imaging detector at high efficiency, a comprehensive monitor and control system is being developed. This system will continuously monitor and maintain the correct operating temperatures, and will provide an on-line monitor of the pressures, flows, mixing and purity of the various fluids. In addition, the velocities and trajectories of Cherenkov photoelectrons drifting within the imaging chambers will be measured using a pulsed UV lamp and a fiber-optic light injection system.

Published
1990
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21. Experimental limits on extra-Z bosons from e+e− annihilation data with the VENUS detector at

Author

K. Amako, Nobuhiro Ishihara, T. Kondo, Y. Takada, Ichita Endo, F. Yabuki, Shigeki Mori, T. Ohsugi, Masami Chiba, J. Haba, Taro Ohama, K. Ogawa, M. Takita, Motomasa Daigo, T. Watanabe, M. Sato, I. Nakano, M. Shioden, Y. Asano, A. Taketani, Teruo Nakamura, R. Tanaka, Makoto Sakuda, Y. Ikegami, N. Terunuma, Mineo Fukawa, I. Hayashibara, Toru Tsuboyama, M. Sakano, Kozo Miyake, Shigeru Odaka, Yoshishige Suzuki, Yoshinobu Unno, H. Yoshida, M. Minami, Y. Yamada, Toru Fukui, Ryusaburo Kikuchi, Y. Hoshi, Nobuyuki Kanematsu, M. Shirakata, H. Saito, K. Tobimatsu, Y. Chiba, Y. Narita, A. Ono, H. Osabe, Fumihiko Takasaki, M. Utsumi, K. Kubo, T. Yamashita, T. Kamitani, F. Suekane, Yasushige Yonezawa, S. Sakamoto, H. Sakae, Hisaya Kurashige, Y. Arai, A. Okamoto, S. Sugimoto, Yasutaka Fukushima, A. Tsukamoto, T. Koseki, Yasuhiro Homma, M. Wakai, T. Sumiyoshi, Hiroshi Sakamoto, Koji Abe, Masato Higuchi, Yoshiyuki Watase, Y. Nagashima, N. Sasao, T. Oyama, T. Yamagata, T. Matsui, Junichi Kanzaki, N. Tamura, Y. Hojyo, Tachishige Hirose, A. Suzuki, Tsuneo Emura, J. Shirai, Yasuo Hemmi, and S. Uehara

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Standard Model, Nuclear physics, Grand Unified Theory, High Energy Physics::Experiment, Boson, Lepton
Abstract

We have tested extra Z models in the reactions e+e−→μ+μ−, τ+τ− and hadrons in the energy range 50 s GeV using the VENUS detector at the TRISTAN e+e− storage ring. Our data are in good agreement with the standard model prediction ( χ 2 N Df = 2.9 31 ) ). We have obtained 90% confidence-level lower limits of 105, 125 and 231 GeV for the masses of ZΨ, Zη and Zχ bosons which are expected from the E6 grand unified theory. We also place a 90% confidence-level lower limit of 426 GeV for the mass of an extra-Z boson whose couplings to quarks and leptons are assumed to be the same as those for the standard Z boson. Our results exceed the previous experimental limits from the p p collider experiments, although there have been some combined analyses reporting the limits better than those obtained in the present analysis.

Published
1990
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22. Photoionization of dopants in liquid argon-xenon mixture

Author

Eido Shibamura, L. Soso, Y. Watanabe, Y. Hasegawa, Toru Tanimori, Yoshinobu Unno, T. Ito, Kimiaki Masuda, Tadayoshi Doke, A. Hitachi, H. Yuta, K. Kaneyuki, T. Takahashi, F. Suekane, H. Iwasaki, T. Kondo, K. Hasuike, and Y. Sakai

Subjects
Physics, Nuclear and High Energy Physics, Photon, Dopant, Doping, chemistry.chemical_element, Trimethylamine, Photoionization, chemistry.chemical_compound, Xenon, chemistry, Excited state, Physics::Space Physics, Astrophysics::Solar and Stellar Astrophysics, Quantum efficiency, Atomic physics, Instrumentation
Abstract

The photoionization quantum efficiency φ of trimethylamine (TMA) in liquid Ar doped with Xe (0.01–0.4%) has been measured and compared with the value obtained in liquid Xe. TMA is excited by vacuum ultraviolet photons originating from Xe 2 * produced by α-particles. Doping liquid Ar with Xe causes a wavelength shift from emission of Ar 2 * to Xe 2 * . The value obtained in liquid Ar doped with Xe is

Published
1993
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23. A high precision reactor neutrino detector for the Double Chooz experiment

Author

F. Suekane

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Solar neutrino, Detector, FOS: Physical sciences, Solar neutrino problem, CHOOZ, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Neutrino detector, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Instrumentation
Abstract

Double Chooz is a reactor neutrino experiment which investigates the last neutrino mixing angle; theta-13. It is necessary to measure reactor neutrino disappearance with precision 1% or better to detect finite value of theta-13. This requirement is the most strict compared to other reactor neutrino experiments performed so far. The Double Chooz experiment makes use of a number of techniques to reduce the possible errors to achieve the sensitivity. The detector is now under construction and it is expected to take first neutrino data in 2009 and to measure sin^22theta-13 with a sensitivity of 0.03 (90%C.L.) In this proceedings, the technical concepts of Double Chooz detector are explained stressing on how it copes with the systematic errors., 4 pages, 1 figure. Proceedings for TIPP09

Published
2010
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24. KASKA experiment: A reactor sin22θ13 project

Author

N. Tamura, K. Sakuma, H. Furuta, K. Nitta, Y. Fukuda, T. Sumiyoshi, Nobuhiro Ishihara, M. Aoki, M. Katsumata, K. Akiyama, F. Suekane, Kunio Sakai, T. Matsumoto, H. Tabata, J. Maeda, Y. Tsuchiya, Y. Nomachi, H. Nakano, T. Kawasaki, T. Hara, M. Kuze, T. Nakagawa, Yasushi Nagasaka, Y. Sakamoto, N. Nakajima, Y. Funaki, T. Haruna, H. Miyata, and T. Matsubara

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Theoretical physics, Phase (waves), Measure (physics), Reactor neutrino, Sensitivity (control systems), Atomic and Molecular Physics, and Optics
Abstract

KASKA is a reactor neutrino experiment to measure θ 13 accurately. The sensitivity reach of sin 2 2 θ 13 will be 0.015 in its first phase. Higher accuracy θ 13 measurement, precise θ 12 measurement and first Δ m 13 2 measurement are also in consideration in future extensions of the experiment. A brief description of the KASKA project and its R&D activities are presented.

Published
2011
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25. Operational experience with the SLD CRID at the SLC

Author

Robert Wilson, M. Dima, Y. Iwasaki, T. Bienz, R. Ben-David, John Scott Whitaker, R. A. Johnson, M. Nussbaum, T.J. Pavel, M. Cavalli-Sforza, G. Hallewell, S. L. Shapiro, James Shank, R.J. Plano, D. O. Caldwell, X Liu, A. Lu, B. N. Ratcliff, S. J. Yellin, S. Sen, S. H. Williams, C. Simopoulos, P. E. Stamer, A.B. d'Oliveira, P.F. Jacques, J. A. Snyder, S. Manly, D. W. G. S. Leith, C. Baltay, J. Va'vra, M. Kalelkar, K. Abe, H. Kawahara, S. Willocq, Yukio Hasegawa, T. Nagamine, F. Suekane, Brian Meadows, S. Narita, D. Aston, John A. Coller, G. B. Word, H. Yuta, J. D. Turk, J. Huber, P.E. Rensing, G. Muller, Dominik Müller, K.G. Baird, David A. Williams, and D. Coyne

Subjects
Physics, Nuclear and High Energy Physics, Light transmission, Instrumentation, Electron drift, Ultraviolet radiation, Reliability engineering
Abstract

We highlight some problems encountered and lessons learned in obtaining stable operation of the SLD CRID for the past four years. During the 1994–1995 run of the SLC, we achieved stable operation of liquid (C6F14) and gas (85% C5F1215% N2) radiators with good UV transparency, and we regularly operate the TPCs with excellent drift lifetimes and good single photo-electron detection efficiency.

Published
1996
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26. Measurements of the electron drift velocity and positive-ion mobility for gases containing CF4

Author

T. Yamashita, H. Kobayashi, T. Nakamura, Masaharu Nomachi, Takashi Nomura, Hisaya Kurashige, M.M. Morii, Noboru Sasao, F. Suekane, Kozo Miyake, Osamu Sasaki, Yasutaka Fukushima, A. Konaka, and T. Taniguchi

Subjects
Physics, chemistry.chemical_classification, Nuclear and High Energy Physics, Drift velocity, Electron, Cathode, Ion, law.invention, Hydrocarbon, chemistry, law, Electric field, Torr, Atomic physics, Instrumentation
Abstract

Measurements of the electron drift velocity and positive-ion mobility for gases containing CF 4 have been performed. The results are presented for four types of gas mixtures containing CF 4 and hydrocarbons: CF 4 +CH 4 , CF 4 +C 2 H 6 , CF 4 +C 3 H 8 and CF 4 +iso-C 4 H 10 . To make a comparison, also positive-ion mobilities for Ar+C 2 H 6 and Ar+C 3 H 8 gas mixtures have been measured. The drift velocities of electrons in a few mixtures are found to exceed 10 cm/μs, twice that in a conventional drift chamber gas such as Ar(50%)+C 2 H 6 (50%). In particular, the electron drift velocity in CF 4 (10%)+CH 4 (90%) is larger than 10 cm/μs, even at a reduced electric field E / P of more than 1 V/(cm Torr). Results on the measurements of the positive ion mobility are consistent with the interpretation that the hydrocarbon ions are the positive ions eventually drifting toward the cathode in the studied gas mixtures. Their mobilities in CF 4 are found to be smaller than those in Ar.

Published
1989
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27. Development of a large cylindrical drift chamber for the venus detector at tristan

Author

T. Kohriki, Yoshiyuki Watase, F. Suekane, N. Ishihara, R. Arai, S. Nakamura, T. Kondo, and H. Boerner

Subjects
Physics, Wire chamber, biology, business.industry, Resolution (electron density), Detector, General Engineering, Venus, biology.organism_classification, Particle detector, Optics, Measuring instrument, business, Image resolution, Storage ring
Abstract

A large cylindrical drift chamber is being built for the VENUS detector at the e+−e− storage ring TRISTAN at KEK. A total of 7104 drift cells is arranged in twenty-nine concentrical layers. The twenty axial layers are combined into double layers to simplify the task of the pattern recognition software. A spatial resolution of 150 ≃m is aimed at.

Published
1983
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28. Charge asymmetry of hadron jets and limits on the compositeness scales in the e+e−→qq̄ reaction at 〈√s〉 = 57.6 GeV

Author

A. Ono, A. Tsukamoto, H. Yoshida, Nobuhiro Ishihara, Y. Ikegami, Tachishige Hirose, M. Sato, Yoshiyuki Watase, Y. Takada, Y. Asano, N. Terunuma, S. Sakamoto, Hisaya Kurashige, T. Ohsugi, Tsuneo Emura, Masami Chiba, Taro Ohama, Yasushige Yonezawa, A. Taketani, Y. Hojyo, J. Shirai, Ichita Endo, S. Shirakata, Motomasa Daigo, Y. Chiba, T. Kamitani, N. Sasao, T. Matsui, Yasuhiro Homma, Makoto Sakuda, K. Kubo, F. Yabuki, T. Yamagata, R. Tanaka, Y. Yamada, S. Suzuki, M. Sakano, Shigeki Mori, Teruo Nakamura, T. Yamashita, N. Tamura, Yasutaka Fukushima, H. Saito, Junichi Kanzaki, M. Shioden, Toru Tsuboyama, Kozo Miyake, H. Sakae, F. Suekane, Ryusaburo Kikuchi, Shigeru Odaka, Yoshishige Suzuki, M. Wakai, S. Sugimoto, D. Haidt, T. Sumiyoshi, Hiroshi Sakamoto, Yasuo Hemmi, T. Oyama, Mineo Fukawa, H. Osabe, S. Uehara, Fumihiko Takasaki, K. Amako, Koji Abe, Toru Fukui, A. Okamoto, K. Tobimatsu, Masato Higuchi, Y. Nagashima, I. Hayashibara, T. Kondo, J. Haba, M. Takita, K. Ogawa, Y. Narita, Y. Arai, T. Watanabe, Yoshinobu Unno, I. Nakano, M. Utsumi, Y. Hoshi, Nobuyuki Kanematsu, T. Koseki, and M. Minami

Subjects
Scattering cross-section, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Electron–positron annihilation, Hadron, Electroweak interaction, Charge (physics), Asymmetry, Standard Model, Nuclear physics, High Energy Physics::Experiment, media_common
Abstract

A charge asymmetry has been measured in hadron jets from e + e − annihilation at energies between 52 and 61.4 geV (〈√ s 〉=57.6 GeV). The measured asymmetry is A =11.4%±2.2%±2.1% and is consistent with the prediction of the standard model of the electroweak theory. By using the differential cross section, lower limits of the compositeness scale in eeqq contact interactions have been determined to be typically a few TeV at 95% CL.

Published
1989
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29. Readout system for a cylindrical drift chamber 'Michie'

Author

K. Nakai, J.-C. Faivre, Shoichi Sasaki, I. Arai, J. Chiba, T. Nagae, F. Suekane, R. Chiba, H. En'yo, Takehiko Mori, Michiko Sekimoto, Y. Takahata, K. Ichimaru, H. Sano, T. Katsumi, Katsuo Tokushuku, and H. Yokota

Subjects
Physics, Nuclear and High Energy Physics, Resistive touchscreen, Physics::Instrumentation and Detectors, Group method of data handling, business.industry, Ionizing particles, Proton Synchrotron, Sense (electronics), Nuclear magnetic resonance, Amplitude, Optics, Wide dynamic range, business, Instrumentation, Electronic systems
Abstract

A readout electronic system for a jet-chamber-type cylindrical drift chamber has been constructed for nuclear experiments at the KEK proton synchrotron. The system handles amplitude and timing information of signals from 384 resistive sense wires, and is able to record multiple hits up to 4 per wire. For detecting composite particles together with minimum ionizing particles, the system was designed to cover a wide dynamic range. A multiprocesser system with use of VERSAbus and MC68000 microprocessors has been developed for fast data handling and for communication with a host computer.

Published
1985
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30. Measurement of R and search for new heavy quarks in e+e− annihilation at 50 and 52 GeV centre-of-mass energies

Author

M. Minami, A. Ono, Toru Fukui, T. Kamitani, Y. Takada, Junichi Kanzaki, Y. Ikegami, Taro Ohama, Motomasa Daigo, I. Hayashibara, Nobuhiro Ishihara, A. Tsukamoto, Ichita Endo, Takashi Ohsugi, Keisuke Maehata, Yoshiyuki Watase, K. Abe, Makoto Sakuda, Yasutaka Fukushima, M. Shioden, Ryusaburo Kikuchi, Y. Hojyo, Y. Yamada, A. Taketani, Hisaya Kurashige, Y. Noguchi, Shigeki Mori, Y. Chiba, Tachishige Hirose, Y. Asano, Y. Suzuki, Y. Nagashima, Y. Hoshi, Yasuhiro Homma, Nobuyuki Kanematsu, F. Suekane, K. Amako, T. Matsui, Toru Tsuboyama, R. Tanaka, M. Wake, N. Tamura, T. Yamashita, M. Wakai, Kozo Miyake, Shigeru Odaka, M. Sakano, H. Osabe, T. Sumiyoshi, Herbert Friedrich Boerner, Masami Chiba, Fumihiko Takasaki, H. Saito, N. Sasao, Tsuneo Emura, J. Shirai, Y. Teramoto, T. Yamagata, Y. Nakagawa, S. Sugimoto, S. Sakamoto, Hiroshi Sakamoto, K. Kubo, H. Sakae, T. Kondo, Masato Higuchi, Keijiro Tobimatsu, I. Nakano, H. Yoshida, Mineo Fukawa, Motoyuki Sato, J. Haba, K. Ogawa, T. Koseki, Yasuo Hemmi, Takashi Nakamura, S. Uehara, Y. Arai, T. Watanabe, and Yoshinobu Unno

Subjects
Systematic error, Nuclear physics, Physics, Quark, Nuclear and High Energy Physics, Particle physics, Annihilation, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The total cross section for the process of the e+e- annihilation into hadrons has been measured at the centre-of-mass energies of 50 GeV and 52 GeV and a search has been made for new heavy quarks. The ratios R = σ(e+e- → hadrons)/σpoint(e+e- → μ+μ-) obtained are 4.4±0.5 at 50 GeV and 4.7±0.3 at 52 GeV, respectively. An additional systematic uncertainty is 10%. From the event shape analysis we found no evidence for a new quark with charge 2 3 e .

Published
1987
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31. Deuteron emission from pion absorption at Tπ = 65 MeV

Author

Michiko Sekimoto, Y. Takahata, K. Ichimaru, K. Nakai, Shoichi Sasaki, I. Arai, K. Nakayama, F. Suekane, H. Yokota, R. Chiba, H. En'yo, and T. Nagae

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Nuclear Theory, Hadron, Elementary particle, Charged particle, Nuclear physics, Baryon, Pion, Deuterium, Atomic physics, Nuclear Experiment, Nucleon
Abstract

The angular distributions of high-energy deuterons and proton-deuteron coincident events were measured at T π = 65 MeV for C, Al and Cu. The angular distribution of the inclusive ( π + , d) cross section was similar to that of the inclusive ( π + , p?) reaction, but the ratios of the inclusive ( π + , pd?) cross section to the inclusive ( π + , pp) cross section had a strong angular dependence. These results support the idea that contributions from the three-nucleon absorption as well as those from the two-step process are important for the emission of high energy deuterons at T π = 65 MeV.

Published
1986
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32. Study of multihadron events with isolated leptons in e+e− annihilation at

Author

M. Wakai, Y. Hoshi, Toru Fukui, T. Sumiyoshi, Nobuyuki Kanematsu, T. Koseki, Ichita Endo, A. Tsukamoto, Y. Asano, Koji Abe, D. Haidt, Yasuo Hemmi, Y. Chiba, Ryusaburo Kikuchi, S. Uehara, Hiroshi Sakamoto, Y. Takada, Y. Arai, Y. Yamada, M. Sato, Masami Chiba, Taro Ohama, Motomasa Daigo, F. Suekane, H. Osabe, Teruo Nakamura, Tachishige Hirose, Fumihiko Takasaki, Keisuke Maehata, T. Watanabe, T. Yamashita, M. Shioden, J. Haba, Toru Tsuboyama, Masato Higuchi, Y. Ikegami, Tsuneo Emura, K. Ogawa, Makoto Sakuda, Kozo Miyake, J. Shirai, T. Kamitani, T. Ohsugi, M. Minami, H. Sakae, Yoshinobu Unno, R. Tanaka, N. Tamura, A. Ono, Y. Hojyo, Yoshishige Suzuki, K. Kubo, K. Amako, M. Sakano, I. Nakano, H. Saito, Keijiro Tobimatsu, Hisaya Kurashige, S. Sugimoto, N. Sasao, Shigeki Mori, T. Yamagata, Yoshiyuki Watase, H. Yoshida, Yasuhiro Homma, M. Wake, T. Matsui, Y. Nagashima, Nobuhiro Ishihara, T. Kondo, S. Sakamoto, Mineo Fukawa, Yasutaka Fukushima, I. Hayashibara, Junichi Kanzaki, and A. Taketani

Subjects
Quark, Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Muon, Annihilation, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Electron, JADE (particle detector), Nuclear physics, High Energy Physics::Experiment, Anomaly (physics), Lepton
Abstract

We have studied inclusive lepton production in e + e − annihilations into multihadrons in the energy range between √ s =50 and 55 GeV using the VENUS detector at TRISTAN, KEK. Though MARK-J and JADE groups at PETRA found an excess of isolated muon events at √ s ⩾46.3 GeV, we have not observed such an anomaly in muon nor in electron production. The observed rates of isolated leptons are consistent with the production and decay of five known quarks.

Published
1988
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33. A search for excited electrons in the e+e− reactions up to the √s of 56 GeV

Author

Y. Asano, Keijiro Tobimatsu, T. Ohsugi, K. Kubo, Toru Fukui, Y. Hojyo, Y. Ikegami, Teruo Nakamura, A. Tsukamoto, Tachishige Hirose, Makoto Sakuda, Toru Tsuboyama, Masato Higuchi, F. Suekane, Yasutaka Fukushima, Kozo Miyake, Tsuneo Emura, Shigeru Odaka, R. Tanaka, N. Tamura, M. Sato, J. Shirai, T. Kondo, Y. Chiba, Junichi Kanzaki, A. Taketani, Ryusaburo Kikuchi, T. Yamashita, J. Haba, Yoshishige Suzuki, K. Ogawa, Nobuhiro Ishihara, N. Sasao, T. Yamagata, K. Amako, I. Hayashibara, Y. Yamada, D. Haidt, T. Koseki, Hisaya Kurashige, Yasuo Hemmi, S. Uehara, Shigeki Mori, Yasuhiro Homma, I. Nakano, Y. Takada, Y. Hoshi, H. Yoshida, M. Minami, Nobuyuki Kanematsu, Masami Chiba, A. Ono, Taro Ohama, Motomasa Daigo, T. Kamitani, Y. Nagashima, H. Sakae, M. Wakai, T. Sumiyoshi, Y. Arai, Koji Abe, T. Watanabe, Yoshinobu Unno, S. Sakamoto, H. Osabe, Fumihiko Takasaki, Mineo Fukawa, Ichita Endo, M. Sakano, H. Saito, M. Shioden, S. Sugimoto, Yoshiyuki Watase, T. Matsui, and Hiroshi Sakamoto

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Angular distribution, Coupling strength, Excited state, Compton scattering, Lower limit
Abstract

Excited electrons, e ∗' s, have been searched for by making use of the processes e + e − →e + e − γγ and e γ ( e ) (quasi-real Compton scattering). From the former process, we have obtained the lower limit for the mass of e ∗' , 27.9 GeV/ c . A good agreement with QED is observed in the latter process, and new upper limits have been set for the coupling strength λ as a function of the mass of e ∗ .

Published
1988
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