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17 results on '"Giot, L."'

1. Updated Summation Model: An Improved Agreement with the Daya Bay Antineutrino Fluxes

Author

Estienne, M., Fallot, M., Algora, A., Briz-Monago, J., Bui, V. M., Cormon, S., Gelletly, W., Giot, L., Guadilla, V., Jordan, D., Meur, L. Le, Porta, A., Rice, S., Rubio, B., Ta��n, J. L., Valencia, E., Zakari-Issoufou, A. -A., SUBATECH, CNRS/IN2P3, de Nantes, Universit��, de Nantes, Institut Mines-Telecom, Nantes, France, IFIC, Valencia, Spain, Research, Institute of Nuclear, Debrecen, Hungary, Physics, Department of, Surrey, University of, Guildford, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Ministerio de Economía y Competitividad (España), and Ministerio de Ciencia, Innovación y Universidades (España)

Subjects
Spectral shape analysis, Fission, 28.41.Ak, General Physics and Astronomy, FOS: Physical sciences, anomaly, 28.50.Hw, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], gamma ray: absorption, 7. Clean energy, 01 natural sciences, Spectral line, 14.60.Pq, renormalization, 23.40.-s, Nuclear physics, Renormalization, 0103 physical sciences, Daya Bay, antineutrino: nuclear reactor, fission, Absorption (logic), Nuclear Experiment (nucl-ex), 010306 general physics, Spectroscopy, Nuclear Experiment, Nuclear Physics, Physics, Range (particle radiation), antineutrino: spectrum, antineutrino: flux, antineutrino: energy spectrum, 28.41.-i, spectral, data management, Anomaly (physics)
Abstract

A new summation method model of the reactor antineutrino energy spectrum is presented. It is updated with the most recent evaluated decay databases and with our Total Absorption Gamma-ray Spectroscopy measurements performed during the last decade. For the first time the spectral measurements from the Daya Bay experiment are compared with the detected antineutrino energy spectrum computed with the updated summation method without any renormalisation. The results exhibit a better agreement than is obtained with the Huber-Mueller model in the 2 to 5 MeV range, the region which dominates the detected flux. An unexpected systematic trend is found that the detected antineutrino flux computed with the summation model decreases with the inclusion of more Pandemonium free data. The detected flux obtained now lies only 1.9% above that detected in the Daya Bay experiment, a value that may be reduced with forthcoming new Pandemonium free data leaving less and less room to the reactor anomaly. Eventually, the new predictions of individual antineutrino spectra for the $^{235}$U, $^{239}$Pu, $^{241}$Pu and $^{238}$U are used to compute the dependence of the reactor antineutrino spectral shape on the fission fractions., Comment: 12 pages, 4 figures

Published
2019
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2. Contribution of recently measured nuclear data to reactor antineutrino energy spectra predictions.

Author

Fallot, M., Cormon, S., Estienne, M., Algora, A., Bui, V. M., Cucoanes, A., Elnimr, M., Giot, L., Jordan, D., Martino, J., Onillon, A., Porta, A., Pronost, G., Remoto, A., Tadín, J. L., Yermia, F., and Zakari-Issoufou, A.-A.

Subjects
ANTINEUTRINOS, NUCLEAR physics, NEUTRINO astrophysics, NUCLEAR reactors, SPECTRUM analysis
Abstract

This paper attempts to summarize the actual problematic of reactor antineutrino energy spectra in the frame of fundamental and applied neutrino physics. Nuclear physics is an important ingredient of reactor antineutrino experiments. These experiments are motivated by neutrino oscillations, i.e. the measure of the θ13 mixing angle. In 2011, after a new computation of the reactor antineutrino energy spectra, based on the conversion of integral data of the beta spectra from 235U, and 239;241Pu, a deficit of reactor antineutrinos measured by short baseline experiments was pointed out. This is called the "reactor anomaly", a new puzzle in the neutrino physics area. Since then, numerous new experimental neutrino projects have emerged. In parallel, computations of the antineutrino spectra independant from the ILL data would be desirable. One possibility is the use of the summation method, summing all the contributions of the fission product beta decay branches that can be found in nuclear databases. Studies have shown that in order to obtain reliable summation antineutrino energy spectra, new nuclear physics measurements of selected fission product beta decay properties are required. In these proceedings, we will present the computation methods of reactor antineutrino energy spectra and the impact of recent beta decay measurements on summation method spectra. The link of these nuclear physics studies with short baseline line oscillation search will be drawn and new neutrino physics projects at research reactors will be briefly presented. [ABSTRACT FROM AUTHOR]

Published
2013
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3. Search for a long lived component in the reaction U+U near the Coulomb barrier.

Author

Villari, A. C. C., Golabek, C., Mittig, W., Heinz, S., Bhattacharyya, S., Boilley, D., Dayras, R., De France, G., Drouart, A., Gaudefroy, L., Giot, L., Marchix, A., Maslov, V., Morjean, M., Mukherjee, G., Navin, A., Penionzkevich, Yu., Rejmund, F., Rejmund, M., and Roussel-Chomaz, P.

Subjects
COULOMB functions, COLLISIONS (Physics), FUSION (Phase transformation), NUCLEAR fission, NUCLEAR physics
Abstract

We performed an experiment to search for a signature of a long living component in the collision of 238U + 238U between 6.09 and 7.35A MeV. The experiment was performed at GANIL using the spectrometer VAMOS, tuned for observing reactions with kinematics similar to fusion-fission events. Theoretical calculations indicate that if a long living component would exist for this reaction, the most probable fission channel of such a giant system would be via the emission of quasi-lead nuclei. We detected events of such a category in the focal plane of VAMOS. These events present an excitation function growing as a function of the bombarding energy. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2007
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4. Clustering in Exotic Nuclei Studies by Transfer Reactions.

Author

Wolski, R., Tchuvil'sky, Yu.M., Kurgalin, S.D., Ter-Akopian, G.M., Roussel-Chomaz, P., Giot, L., and Rusek, K.

Subjects
NUCLEAR physics, NEUTRONS, NUCLEAR reactions, COLLISIONS (Physics), CLUSTER theory (Nuclear physics)
Abstract

Various aspects of the application of shell model approaches to cluster transfer reactions involving exotic nuclei are discussed. A scheme to calculate Spectroscopic Amplitudes for transfer reactions is given. It is calculated for a tetraneutron in 8He as an example. The reduction of the t+t clustering in the 6He nucleus, suggested by an experiment where transfer reactions were studied in the 6He+p collision is confronted with the concept of a supermultiplet for A=6 nuclei. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2004
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5. DIRECT AND RESONANT REACTIONS WITH SECONDARY BEAMS AT LOW ENERGY.

Author

MITTIG, W., DEMONCHY, C. E., ROUSSEL-CHOMAZ, P., GIOT, L., SAVAJOLS, H., ALAMANOS, N., DROUART, A., GILLIBERT, A., LAPOUX, V., POLLACCO, E., TER-AKOPIAN, G., FOMICHEV, A., GOLOVKOV, M. S., STEPANTSOV, S., and WOLSKI, R.

Subjects
PARTICLE physics, CHEMICAL reactions, SPECTROMETERS, NUCLEAR physics, ASTROPHYSICS
Published
2004

6. Investigation of deep inelastic reactions in 238U + 238U at Coulomb barrier energies.

Author

Golabek, C., Heinz, S., Mittig, W., Rejmund, F., Villari, A. C. C., Bhattacharyva, S., Boilley, D., De France, G., Drouart, A., Gaudefroy, L., Giot, L., Maslov, V., Morjean, M., De Mukherjee, G., Penionzkevich, Yu., Roussel-Chomaz, P., and Stodel, C.

Subjects
NUCLEAR physics, BARYONS, PROTONS, NEUTRONS, COULOMB functions
Abstract

We investigated deep inelastic reactions in 238U + 238U collisions at 6.09, 6.49, 6.91, 7.1 and 7.35× A MeV at the VAMOS spectrometer (GANIL). A large transfer of neutrons and protons was observed at all beam energies. For a transfer of more than 10 nucleons the total kinetic energy of the detected fragments becomes independent of the beam energy and reaches values far below the Coulomb barrier for spherical fragments. This points to the formation of a di-nuclear system in the entrance channel which develops an elongated shape and a strong neck. For such reactions we expect an enhanced lifetime of the di-nuclear system which is significantly longer than the time scale for elastic and quasi-elastic reactions. Different theoretical approaches predict delay times of more than 5×10-21 s for a subset of our data. [ABSTRACT FROM AUTHOR]

Published
2010
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7. Influence of the transfer reactions on p + 6He elastic scattering.

Author

Rusek, K., Giot, L., and Roussel-Chomaz, P.

Subjects
*PARTICLES (Nuclear physics), *NUCLEAR physics, *SCATTERING (Physics), *ELASTIC scattering, *NEUTRONS
Abstract

We have studied an effect of neutron and triton transfer reactions on the p +^6He elasticscatteringat25 MeV bymeansofcoupled - reaction - channelcalculations. Itisfoundthatwhenthetransferreactionsareexplicitlyincludedinthecalculationstheimaginarypartoftheinput$ p + $6He optical model potential has to be reduced by 52 percent while its real part enhanced by 15 percent in order to fit the elastic-scattering data. The effect of transfer channels on the real part of this potential is somewhat weaker than that of 6He breakup reported previously. However, for the imaginary part, the effect of transfer channels is dominant. It is concluded that while the breakup contribution to proton elastic scattering mainly affects the real part of the bare potential, the contribution of transfer channels affects mainly its imaginary part. [ABSTRACT FROM AUTHOR]

Published
2007
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8. Reaction cross-sections and reduced strong absorption radii of nuclei in the vicinity of closed shells N = 20 and N = 28.

Author

Khouaja, A., Villari, A. C. C., Benjelloun, M., Auger, G., Baiborodin, D., Catford, W., Chartier, M., Demonchy, C. E., Dlouhy, Z., Gillibert, A., Giot, L., Hirata, D., Lépine-Szily, A., Mittig, W., Orr, N., Penionzhkevich, Y., Pitae, S., Roussel-Chomaz, P., Saint-Laurent, M. G., and Savajols, H.

Subjects
NUCLEAR energy, NEUTRONS, PARTICLES (Nuclear physics), NUCLEAR physics, PHYSICS
Abstract

Energy integrated reaction cross-section measurements of around sixty neutron-rich nuclei covering the region of closed shells N = 20 and N = 28 were performed at intermediate energy (30-65 A . MeV) using direct method. In this experiment, silicon detectors were used as active targets. The reduced strong absorption radii, r02, for 19 new nuclei (27F, 27,30Ne, 33Na, 28, 34-35Mg, 36-38Al, 38-40Si, 41-42P, 42-44S and 45Cl) are deduced for the first time. An additional 60 radii, also measured in this experiment, are compared to results from literature. A new quadratic parametrization is proposed for the nuclear radius as a function of the isospin in the region of closed shells N = 8 and N = 28. According to this parametrization, the skin effect is well reproduced and anomalous behaviour on the radii are observed in 23N, 29Ne, 33Na, 35Mg, 44S, 45Cl and 45Ar nuclei. [ABSTRACT FROM AUTHOR]

Published
2005
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9. New mass measurements at the neutron drip-line.

Author

Savajols, H., Jurado, B., Mittig, W., Baiborodin, D., Catford, W., Chartier, M., Demonchy, C., Dlouhy, Z., Gillibert, A., Giot, L., Khouaja, A., Lépine-Szily, A., S. Lukyanov, Mrazek, J., Orr, N., Penionzhkevich, Y., Pita, S., Rousseau, M., Roussel-Chomaz, P., and Villari, A.

Subjects
MASS measurement, NEUTRONS, NUCLEAR shell theory, PARTICLES (Nuclear physics), NUCLEAR physics
Abstract

A new SPEG mass measurement experiment has been performed to determine masses closer to the neutron drip-line in the mass region A ∼ 10-50. The precision of 37 masses has been improved and 8 masses were measured for the first time. The region covered was motivated by the study of shell structure and of shape coexistence in the region of closed shells N = 20 and N = 28. The evolution of the two neutron separation energies and the shell correction energy have been studied as a function of the neutron number. The results thus obtained provide a means of identifying, in exotic nuclei, new nuclear structure effects that are well illustrated by the changes of the conventional magic structure. [ABSTRACT FROM AUTHOR]

Published
2005
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10. Study of the ground-state wave function of 6He via the 6He(p, t)α transfer reaction.

Author

Giot, L., Roussel-Chomaz, P., Alamanos, N., Auger, F., Cortina-Gil, M.-D., Demonchy, Ch. E., Fernandez, J., Gillibert, A., Jouanne, C., Lapoux, V., Mackintosh, R., Mittig, W., Nalpas, L., Pakou, A., Pita, S., Pollacco, E. C., Rodin, A., Rusek, K., Savajols, H., and Sida, J. L.

Subjects
*NUCLEAR reactions, *WAVE functions, *WAVE mechanics, *KINEMATICS, *NUCLEAR physics, *PHYSICS
Abstract

We have measured the 6He(p, t)α transfer reaction in inverse kinematics at 25MeV/nucleon. The data were compared to DWBA calculations in order to extract the spectroscopic amplitudes for α +2 n and t + t configurations in the ground state of 6He. [ABSTRACT FROM AUTHOR]

Published
2005
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11. MAYA: An active-target detector for binary reactions with exotic beams

Author

Demonchy, C.E., Caamaño, M., Wang, H., Mittig, W., Roussel-Chomaz, P., Savajols, H., Chartier, M., Cortina-Gil, D., Fomichev, A., Frémont, G., Gangnant, P., Gillibert, A., Giot, L., Golovkov, M.S., Jurado, B., Libin, J.F., Obertelli, A., Pollaco, E., Rodin, A., and Spitaels, Ch.

Subjects
*ENGINEERING instruments, *NUCLEAR physics, *NUCLEAR reactions, *ENERGY dissipation
Abstract

Abstract: With recent improvements in the production of radioactive beams in facilities such as SPIRAL at GANIL, a larger area of the nuclear chart is now accessible for experimentation. For these usually low-intensity and low-energy secondary beams, we have developed the new MAYA detector based on the active-target concept. This device allows to use a relatively thick target without loss of resolution by using the detection gas as target material. Dedicated 3D tracking, particle identification, energy loss and range measurements allow complete kinematic reconstruction of reactions taking place inside MAYA. [Copyright &y& Elsevier]

Published
2007
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12. Low-lying states and structure of the exotic 8He via direct reactions on the proton

Author

Skaza, F., Lapoux, V., Keeley, N., Alamanos, N., Auger, F., Beaumel, D., Becheva, E., Blumenfeld, Y., Delaunay, F., Drouart, A., Gillibert, A., Giot, L., Khan, E., Nalpas, L., Pakou, A., Pollacco, E., Raabe, R., Roussel-Chomaz, P., Rusek, K., and Scarpaci, J.-A.

Subjects
*NUCLEAR physics, *COLLISIONS (Nuclear physics), *RESONANCE, *PARTICLES (Nuclear physics)
Abstract

The structure of the light exotic nucleus 8He was investigated using direct reactions of the 8He SPIRAL beam on a proton-rich target. The (p,p'') scattering to the state, the (p,d)7He and (p,t)6He transfer reactions, were measured at the energy . The light charged particles (p,d,t) were detected in the MUST Si-strip telescope array. The excitation spectrum of 8He was extracted from the (p,p'') reaction. Above the known excited state at 3.6 MeV, a second resonance was found around 5.4 MeV. The cross sections were analyzed within the coupled-reaction channels framework, using microscopic potentials. It is inferred that the 8He ground state has a more complex neutron-skin structure than suggested by previous models assuming a pure configuration. [Copyright &y& Elsevier]

Published
2007
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13. Important pickup coupling effect on elastic scattering

Author

Skaza, F., Keeley, N., Lapoux, V., Alamanos, N., Auger, F., Beaumel, D., Becheva, E., Blumenfeld, Y., Delaunay, F., Drouart, A., Gillibert, A., Giot, L., Kemper, K.W., Mackintosh, R.S., Nalpas, L., Pakou, A., Pollacco, E.C., Raabe, R., Roussel-Chomaz, P., and Scarpaci, J.-A.

Subjects
*ELASTIC scattering, *SCATTERING (Physics), *PARTICLES (Nuclear physics), *NUCLEAR physics
Abstract

Abstract: The and reactions were measured in inverse kinematics at and analyzed within the coupled reaction channels framework, the cross section being particularly large. We find that coupling to pickup has a profound effect on the elastic scattering, and that these strong coupling effects should be included in analyses of proton elastic and inelastic scattering. Through its modification of the elastic scattering wave functions this coupling will strongly affect the extraction of spectroscopic information such as the relationship between neutron and proton nuclear deformations, with important consequences for our understanding of the structure of exotic nuclei. [Copyright &y& Elsevier]

Published
2005
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14. Muon capture on light isotopes measured with the Double Chooz detector

Author

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

Subjects
Physics, Semileptonic decay, Particle physics, education.field_of_study, Muon, 010308 nuclear & particles physics, Population, neutrino physic, 01 natural sciences, Muon capture, Nuclear physics, 13. Climate action, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Production (computer science), Neutrino, 010306 general physics, Ground state, education
Abstract

Using the Double Chooz detector, designed to measure the neutrino mixing angle $\theta_{13}$, the products of $\mu^-$ capture on $^{12}$C, $^{13}$C, $^{14}$N and $^{16}$O have been measured. Over a period of 489.5 days, $2.3\times10^6$ stopping cosmic $\mu^-$ have been collected, of which $1.8\times10^5$ captured on carbon, nitrogen, or oxygen nuclei in the inner detector scintillator or acrylic vessels. The resulting isotopes were tagged using prompt neutron emission (when applicable), the subsequent beta decays, and, in some cases, $\beta$-delayed neutrons. The most precise measurement of the rate of $^{12}\mathrm C(\mu^-,\nu)^{12}\mathrm B$ to date is reported: $6.57^{+0.11}_{-0.21}\times10^{3}\,\mathrm s^{-1}$, or $(17.35^{+0.35}_{-0.59})\%$ of nuclear captures. By tagging excited states emitting gammas, the ground state transition rate to $^{12}$B has been determined to be $5.68^{+0.14}_{-0.23}\times10^3\,\mathrm s^{-1}$. The heretofore unobserved reactions $^{12}\mathrm C(\mu^-,\nu\alpha)^{8}\mathrm{Li}$, $^{13}\mathrm C(\mu^-,\nu\mathrm n\alpha)^{8}\mathrm{Li}$, and $^{13}\mathrm C(\mu^-,\nu\mathrm n)^{12}\mathrm B$ are measured. Further, a population of $\beta$n decays following stopping muons is identified with $5.5\sigma$ significance. Statistics limit our ability to identify these decays definitively. Assuming negligible production of $^{8}$He, the reaction $^{13}\mathrm C(\mu^-,\nu\alpha)^{9}\mathrm{Li}$ is found to be present at the $2.7\sigma$ level. Limits are set on a variety of other processes.

Published
2016

15. 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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16. 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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17. 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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