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1. 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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2. Precision Muon Reconstruction in Double Chooz

Author

Stefan Schoppmann, Yuri Kamyshkov, P.-J. Chang, M. Obolensky, H. de Kerret, M. Vivier, Kazuhiro Terao, L. N. Kalousis, J. Maricic, Marcos Cerrada, N. Vassilopoulos, M. Elnimr, Christopher Wiebusch, C. Grant, S. Shimojima, M. D. Skorokhvatov, Michael Wurm, Cécile Jollet, B. Reinhold, H. Watanabe, V. Zimmer, G. A. Valdiviesso, BayarJon Paul Lubsandorzhiev, S. Perasso, G. A. Horton-Smith, M. C. Goodman, J.V. Dawson, A. S. Cucoanes, E. Blucher, A. Osborn, E. Chauveau, Daniel M. Kaplan, T. Miletic, Zelimir Djurcic, R. Milincic, R. Carr, R. Roncin, G. Yang, L. Goodenough, R. Santorelli, M. Kuze, Christian Buck, Ying Sun, B. Rybolt, E. Damon, V. Sibille, J. Reichenbacher, A. Tonazzo, D. Kryn, S. Roth, A.V. Etenko, Eric Baussan, P. Novella, Luis González, G. Pronost, D. Dietrich, Thierry Lasserre, J. M. LoSecco, M. Franke, A. Hourlier, Lydie Giot, Anselmo Meregaglia, T. Hara, J. Maeda, J. C. Barriere, I. M. Pepe, J. Martino, P. Chimenti, Tobias Lachenmaier, Y. Sakamoto, T.J.C. Bezerra, J. C. dos Anjos, G. Mention, S. Lucht, T. Matsubara, David Lhuillier, Marcos Dracos, I. Stancu, A.C. Schilithz, Yoshio Abe, Janet Conrad, J. M. López-Castaño, Lothar Oberauer, S. Schönert, S. M. Fernandes, H. Furuta, Anatael Cabrera, P. Pfahler, C. E. Lane, I. Bekman, Achim Stahl, R. Sharankova, S. V. Sukhotin, E. Smith, J. Dhooghe, L. B. Bezrukov, M. Röhling, Muriel Fallot, E. Caden, J. Haser, E. Conover, M. H. Shaevitz, A. Onillon, L. Camilleri, T. Kawasaki, A. Stüken, A. Minotti, C. Palomares, V. Fischer, N. Haag, M. Göger-Neff, Florian Kaether, C. Veyssiere, Michael Hofmann, J. Felde, D. Franco, V. V. Sinev, Masaki Ishitsuka, Audrey Letourneau, Lindley Winslow, Yasushi Nagasaka, E. Kemp, D. Shrestha, M. Bergevin, F. Suekane, L.F.F. Stokes, T. Sumiyoshi, K. Crum, J. I. Crespo-Anadón, Amanda Porta, J. Spitz, Y. Nikitenko, I. Gil-Botella, C. Mariani, Josef Jochum, F. Yermia, Matthew L Strait, Robert Svoboda, F. von Feilitzsch, H. P. Lima, J. Busenitz, Sebastian Wagner, Manfred Lindner, Antoine Collin, N. Walsh, H. H. Trinh Thi, Double Chooz Collaboration, Département d'Ingénierie des Systèmes (ex SIS) (DIS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Max-Planck-Institut, Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Département de Physique des Particules (ex SPP) (DPP), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Double Chooz, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Conrad, Janet Marie, Spitz, Joshua B., Terao, Kazuhiro, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Double-CHOOZ, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Département de Physique des Particules (ex SPP) (DPhP), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Abe, Y, Dos Anjos, J, Barriere, J, Baussan, E, Bekman, I, Bergevin, M, Bezerra, T, Bezrukov, L, Blucher, E, Buck, C, Busenitz, J, Cabrera, A, Caden, E, Camilleri, L, Carr, R, Cerrada, M, Chang, P, Chauveau, E, Chimenti, P, Collin, A, Conover, E, Conrad, J, Crespo-Anadon, J, Crum, K, Cucoanes, A, Damon, E, Dawson, J, Dhooghe, J, Dietrich, D, Djurcic, Z, Dracos, M, Elnimr, M, Etenko, A, Fallot, M, Von Feilitzsch, F, Felde, J, Fernandes, S, Fischer, V, Franco, D, Franke, M, Furuta, H, Gil-Botella, I, Giot, L, Goger-Neff, M, Gonzalez, L, Goodenough, L, Goodman, M, Grant, C, Haag, N, Hara, T, Haser, J, Hofmann, M, Horton-Smith, G, Hourlier, A, Ishitsuka, M, Jochum, J, Jollet, C, Kaether, F, Kalousis, L, Kamyshkov, Y, Kaplan, D, Kawasaki, T, Kemp, E, De Kerret, H, Kryn, D, Kuze, M, Lachenmaier, T, Lane, C, Lasserre, T, Letourneau, A, Lhuillier, D, Lima, J, Lindner, M, Lopez-Castano, J, Losecco, J, Lubsandorzhiev, B, Lucht, S, Maeda, J, Mariani, C, Maricic, J, Martino, J, Matsubara, T, Mention, G, Meregaglia, A, Miletic, T, Milincic, R, Minotti, A, Nagasaka, Y, Nikitenko, Y, Novella, P, Oberauer, L, Obolensky, M, Onillon, A, Osborn, A, Palomares, C, Pepe, I, Perasso, S, Pfahler, P, Porta, A, Pronost, G, Reichenbacher, J, Reinhold, B, Rohling, M, Roncin, R, Roth, S, Rybolt, B, Sakamoto, Y, Santorelli, R, Schilithz, A, Schonert, S, Schoppmann, S, Shaevitz, M, Sharankova, R, Shimojima, S, Shrestha, D, Sibille, V, Sinev, V, Skorokhvatov, M, Smith, E, Spitz, J, Stahl, A, Stancu, I, Stokes, L, Strait, M, Stuken, A, Suekane, F, Sukhotin, S, Sumiyoshi, T, Sun, Y, Svoboda, R, Terao, K, Tonazzo, A, Trinh Thi, H, Valdiviesso, G, Vassilopoulos, N, Veyssiere, C, Vivier, M, Wagner, S, Walsh, N, Watanabe, H, Wiebusch, C, Winslow, L, Wurm, M, Yang, G, Yermia, F, and Zimmer, V

Subjects
Nuclear and High Energy Physics, Particle physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, FOS: Physical sciences, STRIPS, Double Chooz, Muon reconstruction, Neutrino detector, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], CHOOZ, Scintillator, High Energy Physics - Experiment, law.invention, NO, Nuclear physics, High Energy Physics - Experiment (hep-ex), law, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Instrumentation, Image resolution, Physics, Muon, Detector, Reconstruction algorithm, Instrumentation and Detectors (physics.ins-det), Physics::Accelerator Physics, High Energy Physics::Experiment
Abstract

We describe a muon track reconstruction algorithm for the reactor anti-neutrino experiment Double Chooz. The Double Chooz detector consists of two optically isolated volumes of liquid scintillator viewed by PMTs, and an Outer Veto above these made of crossed scintillator strips. Muons are reconstructed by their Outer Veto hit positions along with timing information from the other two detector volumes. All muons are fit under the hypothesis that they are through-going and ultrarelativistic. If the energy depositions suggest that the muon may have stopped, the reconstruction fits also for this hypothesis and chooses between the two via the relative goodness-of-fit. In the ideal case of a through-going muon intersecting the center of the detector, the resolution is ∼40 mm in each transverse dimension. High quality muon reconstruction is an important tool for reducing the impact of the cosmogenic isotope background in Double Chooz., National Science Foundation (U.S.), United States. Department of Energy

Published
2014
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3. Ortho-positronium observation in the Double Chooz experiment

Author

R. Milincic, Christian Buck, B. Rybolt, S. V. Sukhotin, A. Minotti, Ernesto Kemp, Cécile Jollet, D. Dietrich, M. Röhling, Matthew L Strait, N. Haag, G. Pronost, E. Damon, J. Martino, E. Caden, S. Lucht, A.V. Etenko, Masahiro Kuze, Eric Baussan, E. Chauveau, L. B. Bezrukov, Michael Wurm, H. Watanabe, M. Obolensky, Kazuhiro Terao, G. Mention, Christopher Wiebusch, G. A. Valdiviesso, P. Novella, R. Sharankova, Lydie Giot, L.N. Kalousis, S. Shimojima, Achim Stahl, Michael H. Shaevitz, M. Göger-Neff, Takeo Kawasaki, V. Zimmer, I. Stancu, K. Crum, Z. Djurcic, D. Lhuillier, M. Cerrada, P. Chimenti, V. Sinev, A. S. Cucoanes, G. A. Horton-Smith, M. Skorokhvatov, R. Carr, Bayarto Lubsandorzhiev, H. Furuta, A. Tonazzo, C. Mariani, Thierry Lasserre, A. Onillon, Josef Jochum, J. I. Crespo-Anadón, Y. Kamyshkov, J. Busenitz, L. Camilleri, C. Palomares, J. C. Barriere, J. Reichenbacher, Lindley Winslow, H. H. Trinh Thi, F. von Feilitzsch, Anatael Cabrera, Luis González, N. Vassilopoulos, J.V. Dawson, Yasushi Nagasaka, J. Dhooghe, E. Conover, R. Santorelli, T.J.C. Bezerra, V. Fischer, J. Haser, J. Maricic, M. Franke, M. Vivier, Stefan Schoppmann, I. M. Pepe, Eluned Smith, D. Kryn, T. Sumiyoshi, Y. Sakamoto, C. E. Lane, T. Miletic, A. Osborn, M. Ishitsuka, F. Suekane, F. Yermia, L.F.F. Stokes, Sebastian Wagner, Manfred Lindner, Antoine Collin, Y. Nikitenko, P. Pfahler, V. Sibille, T. Hara, Alain Letourneau, E. Blucher, N. Walsh, J. Maeda, L. Goodenough, S. M. Fernandes, I. Gil-Botella, L. Oberauer, C. Veyssiere, J. C. dos Anjos, Amanda Porta, Maury Goodman, Tobias Lachenmaier, Yoshio Abe, A. Hourlier, Daniel M. Kaplan, Janet Conrad, S. Perasso, Anselmo Meregaglia, H. de Kerret, R. Roncin, T. Matsubara, Ying Sun, B. Reinhold, Stefan Schönert, John M. LoSecco, M. Elnimr, Michael Hofmann, C. Grant, D. Shrestha, J. Spitz, M. Bergevin, Stefan Roth, A.C. Schilithz, I. Bekman, A. Stüken, P.-J. Chang, J. M. López-Castaño, Muriel Fallot, Florian Kaether, J. Felde, D. Franco, Robert Svoboda, H. P. Lima, M. Dracos, G. Yang, AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Département de Physique des Particules (ex SPP) (DPP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Département d'Ingénierie des Systèmes (ex SIS) (DIS), Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Conrad, Janet, Spitz, Joshua B., Terao, K., Winslow, Lindley, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique des Particules (ex SPP) (DPhP), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Center for Neutrino Physics, Abe, Y, Dos Anjos, J, Barriere, J, Baussan, E, Bekman, I, Bergevin, M, Bezerra, T, Bezrukov, L, Blucher, E, Buck, C, Busenitz, J, Cabrera, A, Caden, E, Camilleri, L, Carr, R, Cerrada, M, Chang, P, Chauveau, E, Chimenti, P, Collin, A, Conover, E, Conrad, J, Crespo-Anado, J, Crum, K, Cucoanes, A, Damon, E, Dawson, J, Dhooghe, J, Dietrich, D, Djurcic, Z, Dracos, M, Elnimr, M, Etenko, A, Fallot, M, Von Feilitzsch, F, Felde, J, Fernandes, S, Fischer, V, Franco, D, Franke, M, Furuta, H, Gil-Botella, I, Giot, L, Goger-Neff, M, Gonzalez, L, Goodenough, L, Goodman, M, Grant, C, Haag, N, Hara, T, Haser, J, Hofmann, M, Horton-Smith, G, Hourlier, A, Ishitsuka, M, Jochum, J, Jollet, C, Kaether, F, Kalousis, L, Kamyshkov, Y, Kaplan, D, Kawasaki, T, Kemp, E, De Kerret, H, Kryn, D, Kuze, M, Lachenmaier, T, Lane, C, Lasserre, T, Letourneau, A, Lhuillier, D, Lima, H, Lindner, M, Lopez-Castano, J, Losecco, J, Lubsandorzhiev, B, Lucht, S, Maeda, J, Mariani, C, Maricic, J, Martino, J, Matsubara, T, Mention, G, Meregaglia, A, Miletic, T, Milincic, R, Minotti, A, Nagasaka, Y, Nikitenko, Y, Novella, P, Oberauer, L, Obolensky, M, Onillon, A, Osborn, A, Palomares, C, Pepe, I, Perasso, S, Pfahler, P, Porta, A, Pronost, G, Reichenbacher, J, Reinhold, B, Rohling, M, Roncin, R, Roth, S, Rybolt, B, Sakamoto, Y, Santorelli, R, Schilithz, A, Schonert, S, Schoppmann, S, Shaevitz, M, Sharankova, R, Shimojima, S, Shrestha, D, Sibille, V, Sinev, V, Skorokhvatov, M, Smith, E, Spitz, J, Stahl, A, Stancu, I, Stokes, L, Strait, M, Stuken, A, Suekane, F, Sukhotin, S, Sumiyoshi, T, Sun, Y, Svoboda, R, Terao, K, Tonazzo, A, Thi, H, Valdiviesso, G, Vassilopoulos, N, Veyssiere, C, Vivier, M, Wagner, S, Walsh, N, Watanabe, H, Wiebusch, C, Winslow, L, Wurm, M, Yang, G, Yermia, F, Zimmera, V, Double Chooz Collaboration, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)

Subjects
Physics, Neutrino Detectors and Telescopes, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Neutrino Detectors and Telescope, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Scintillator, CHOOZ, Particle identification, High Energy Physics - Experiment, Positronium, Nuclear physics, High Energy Physics - Experiment (hep-ex), Positron, Inverse beta decay, High Energy Physics::Experiment, Neutrino, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

The Double Chooz experiment measures the neutrino mixing angle θ13 by detecting reactor ν¯e via inverse beta decay. The positron-neutron space and time coincidence allows for a sizable background rejection, nonetheless liquid scintillator detectors would profit from a positron/electron discrimination, if feasible in large detector, to suppress the remaining background. Standard particle identification, based on particle dependent time profile of photon emission in liquid scintillator, can not be used given the identical mass of the two particles. However, the positron annihilation is sometimes delayed by the ortho-positronium (o-Ps) metastable state formation, which induces a pulse shape distortion that could be used for positron identification. In this paper we report on the first observation of positronium formation in a large liquid scintillator detector based on pulse shape analysis of single events. The o-Ps formation fraction and its lifetime were measured, finding the values of 44% ± 12% (sys.) ± 5% (stat.) and 3.68ns ± 0.17ns (sys.) ± 0.15ns (stat.) respectively, in agreement with the results obtained with a dedicated positron annihilation lifetime spectroscopy setup., National Science Foundation (U.S.), United States. Dept. of Energy

Published
2014
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4. Journal of High Energy Physics

Author

G. Mention, R. Svoboda, T. Kawasaki, P. Novella, J. Dhooghe, N. Vassilopoulos, Amanda Porta, D. Kryn, Zelimir Djurcic, N. Walsh, J. Reichenbacher, J. M. López-Castaño, H. de Kerret, H. H. Trinh Thi, R. Milincic, Yuri Kamyshkov, Muriel Fallot, J. Martino, A. Cucoanes, S. Shimojima, A.C. Schilithz, P.-J. Chang, A. Onillon, L. B. Bezrukov, I. Bekman, J.V. Dawson, G. A. Horton-Smith, M. Franke, Anatael Cabrera, R. Carr, A. Stüken, S. M. Fernandes, K. Crum, Florian Kaether, E. Blucher, J. I. Crespo-Anadón, Y. Nikitenko, T. Sumiyoshi, S. Perasso, A. Minotti, Alain Letourneau, J. Felde, D. Franco, Marcos Cerrada, M. Elnimr, V. V. Sinev, Eric Baussan, Marcos Dracos, David Lhuillier, Ernesto Kemp, L. Camilleri, E. Damon, R. Sharankova, V. Fischer, J. Maricic, Manfred Lindner, J. C. dos Anjos, Antoine Collin, D. Shrestha, M. Obolensky, R. Santorelli, Luis González, Cécile Jollet, B. Reinhold, E. Conover, M. Bergevin, Yoshio Abe, L. N. Kalousis, T.J.C. Bezerra, S. Lucht, S. Roth, J. M. LoSecco, Anselmo Meregaglia, J. Spitz, Lothar Oberauer, Daniel M. Kaplan, C. Palomares, A. Stahl, Y. Sakamoto, I. Gil-Botella, V. Zimmer, C. Grant, C. Veyssiere, Tobias Lachenmaier, V. Sibille, S. V. Sukhotin, E. Smith, H. P. Lima, A. Osborn, M. Kuze, N. Haag, Christian Buck, B. Rybolt, R. Roncin, J. C. Barriere, J. Busenitz, Ying Sun, C. Mariani, A. Hourlier, Lydie Giot, M. Röhling, Josef Jochum, Junpei Maeda, L. Goodenough, F. von Feilitzsch, D. Dietrich, Michael Hofmann, Stefan Wagner, Matthew L Strait, Janet Conrad, T. Hara, A. Tonazzo, M. Göger-Neff, Kazuhiro Terao, Christopher Wiebusch, Yasushi Nagasaka, G. A. Valdiviesso, S. Schönert, M. C. Goodman, T. Miletic, F. Yermia, I. M. Pepe, P. Chimenti, G. Pronost, P. Pfahler, C. E. Lane, T. Matsubara, E. Chauveau, M. H. Shaevitz, E. Caden, Masaki Ishitsuka, Lindley Winslow, Stefan Schoppmann, J. Haser, M. Vivier, M. D. Skorokhvatov, Michael Wurm, H. Watanabe, G. Yang, Bayarto Lubsandorzhiev, Thierry Lasserre, F. Suekane, L.F.F. Stokes, A.V. Etenko, I. Stancu, H. Furuta, Double Chooz Collaboration, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), APC - Neutrinos, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Double-CHOOZ, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Abe, Y, dos Anjos, J, Barriere, J, Baussan, E, Bekman, I, Bergevin, M, Bezerra, T, Bezrukov, L, Blucher, E, Buck, C, Busenitz, J, Cabrera, A, Caden, E, Camilleri, L, Carr, R, Cerrada, M, Chang, P, Chauveau, E, Chimenti, P, Collin, A, Conover, E, Conrad, J, Crespo-Anadon, J, Crum, K, Cucoanes, A, Damon, E, Dawson, J, Dhooghe, J, Dietrich, D, Djurcic, Z, Dracos, M, Elnimr, M, Etenko, A, Fallot, M, von Feilitzsch, F, Felde, J, Fernandes, S, Fischer, V, Franco, D, Franke, M, Furuta, H, Gil-Botella, I, Giot, L, Goger-Neff, M, Gonzalez, L, Goodenough, L, Goodman, M, Grant, C, Haag, N, Hara, T, Haser, J, Hofmann, M, Horton-Smith, G, Hourlier, A, Ishitsuka, M, Jochum, J, Jollet, C, Kaether, F, Kalousis, L, Kamyshkov, Y, Kaplan, D, Kawasaki, T, Kemp, E, de Kerret, H, Kryn, D, Kuze, M, Lachenmaier, T, Lane, C, Lasserre, T, Letourneau, A, Lhuillier, D, Lima, H, Lindner, M, Lopez-Castano, J, Losecco, J, Lubsandorzhiev, B, Lucht, S, Maeda, J, Mariani, C, Maricic, J, Martino, J, Matsubara, T, Mention, G, Meregaglia, A, Miletic, T, Milincic, R, Minotti, A, Nagasaka, Y, Nikitenko, Y, Novella, P, Oberauer, L, Obolensky, M, Onillon, A, Osborn, A, Palomares, C, Pepe, I, Perasso, S, Pfahler, P, Porta, A, Pronost, G, Reichenbacher, J, Reinhold, B, Rohling, M, Roncin, R, Roth, S, Rybolt, B, Sakamoto, Y, Santorelli, R, Schilithz, A, Schonert, S, Schoppmann, S, Shaevitz, M, Sharankova, R, Shimojima, S, Shrestha, D, Sibille, V, Sinev, V, Skorokhvatov, M, Smith, E, Spitz, J, Stahl, A, Stancu, I, Stokes, L, Strait, M, Stuken, A, Suekane, F, Sukhotin, S, Sumiyoshi, T, Sun, Y, Svoboda, R, Terao, K, Tonazzo, A, Trinh Thi, H, Valdiviesso, G, Vassilopoulos, N, Veyssiere, C, Vivier, M, Wagner, S, Walsh, N, Watanabe, H, Wiebusch, C, Winslow, L, Wurm, M, Yang, G, Yermia, F, Zimmer, V, Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), and Center for Neutrino Physics

Subjects
Nuclear and High Energy Physics, [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Physics - Instrumentation and Detectors, Neutrino Detectors and Telescope, FOS: Physical sciences, CHOOZ, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Experiment, Distortion, 0103 physical sciences, Energy spectrum, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Mixing (physics), Physics, Neutrino Detectors and Telescopes, 010308 nuclear & particles physics, Oscillation, [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Detector, Function (mathematics), Instrumentation and Detectors (physics.ins-det), Neutrino, Instrumentation and Detectors
Abstract

The Double Chooz experiment presents improved measurements of the neutrino mixing angle $\theta_{13}$ using the data collected in 467.90 live days from a detector positioned at an average distance of 1050 m from two reactor cores at the Chooz nuclear power plant. Several novel techniques have been developed to achieve significant reductions of the backgrounds and systematic uncertainties with respect to previous publications, whereas the efficiency of the $\bar\nu_{e}$ signal has increased. The value of $\theta_{13}$ is measured to be $\sin^{2}2\theta_{13} = 0.090 ^{+0.032}_{-0.029}$ from a fit to the observed energy spectrum. Deviations from the reactor $\bar\nu_{e}$ prediction observed above a prompt signal energy of 4 MeV and possible explanations are also reported. A consistent value of $\theta_{13}$ is obtained from a fit to the observed rate as a function of the reactor power independently of the spectrum shape and background estimation, demonstrating the robustness of the $\theta_{13}$ measurement despite the observed distortion., Comment: 44 pages, 25 figures. Figures 21 and 22 have been replaced (statistical error bars for bins above 8 MeV have become smaller). No other changes in the results of the paper; an Erratum submitted to JHEP

Published
2014
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5. Invariants of counterinteraction of femtosecond light pulses

Author

Vyacheslav A. Trofimov and K. Y. Nikitenko

Subjects
Quantum optics, Physics, Nuclear and High Energy Physics, business.industry, Wave propagation, Nonlinear optics, Astronomy and Astrophysics, Statistical and Nonlinear Physics, Electronic, Optical and Magnetic Materials, Nonlinear system, Optics, Nonlinear medium, Femtosecond, Spatial frequency, Electrical and Electronic Engineering, Invariant (mathematics), business
Abstract

In this paper, we obtain invariants of counterinteraction of femtosecond light pulses in a nonlinear medium. In the process of interaction, the harmonic amplitude at a frequency determined by the dispersion of nonlinear response of the medium oscillates along the propagation path with spatial frequency that is also determined by nonlinearity dispersion. The result obtained must be allowed for, in particular, during the computer modeling of interaction between counterpropagating light pulses.

Published
1999
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