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23 results on '"S. Cormon"'

1. The Double Chooz antineutrino detectors

Author

H. de Kerret, Y. Abe, C. Aberle, T. Abrahão, J. M. Ahijado, T. Akiri, J. M. Alarcón, J. Alba, H. Almazan, J. C. dos Anjos, S. Appel, F. Ardellier, I. Barabanov, J. C. Barriere, E. Baussan, A. Baxter, I. Bekman, M. Bergevin, A. Bernstein, W. Bertoli, T. J. C. Bezerra, L. Bezrukov, C. Blanco, N. Bleurvacq, E. Blucher, H. Bonet, M. Bongrand, N. S Bowden, T. Brugière, C. Buck, M. Buizza Avanzini, J. Busenitz, A. Cabrera, E. Caden, E. Calvo, L. Camilleri, R. Carr, S. Cazaux, J. M. Cela, M. Cerrada, P. J. Chang, P. Charon, E. Chauveau, P. Chimenti, T. Classen, A. P. Collin, E. Conover, J. M Conrad, S. Cormon, O. Corpace, B. Courty, J. I. Crespo-Anadón, M. Cribier, K. Crum, S. Cuadrado, A. Cucoanes, M. D’Agostino, E. Damon, J. V. Dawson, S. Dazeley, M. Dierckxsens, D. Dietrich, Z. Djurcic, F. Dorigo, M. Dracos, V. Durand, Y. Efremeko, M. Elnimr, A. Etenko, E. Falk, M. Fallot, M. Fechner, J. Felde, S. M. Fernandes, C. Fernández-Bedoya, D. Francia, D. Franco, V. Fischer, A. J. Franke, M. Franke, H. Furuta, F. Garcia, J. Garcia, I. Gil-Botella, L. Giot, A. Givaudan, M. Göger-Neff, H. Gomez, L. F. G. Gonzalez, L. Goodenough, M. C. Goodman, J. Goon, B. Gramlich, D. Greiner, A. Guertin, B. Guillon, S. M. Habib, Y. Haddad, T. Hara, F. X. Hartmann, J. Hartnell, J. Haser, A. Hatzikoutelis, D. Hellwig, S. Hervé, R. Hofacker, G. Horton-Smith, A. Hourlier, M. Ishitsuka, K. Jänner, S. Jiménez, J. Jochum, C. Jollet, F. Kaether, K. Kale, L. Kalousis, Y. Kamyshkov, M. Kaneda, D. M. Kaplan, M. Karakac, T. Kawasaki, E. Kemp, Y. Kibe, T. Kirchner, T. Konno, D. Kryn, T. Kutter, M. Kuze, T. Lachenmaier, C. E. Lane, C. Langbrandtner, T. Lasserre, C. Lastoria, L. Latron, C. Leonardo, A. Letourneau, D. Lhuillier, H. P. Lima, M. Lindner, J. M. López-Castaño, J. M. LoSecco, B. Lubsandorzhiev, S. Lucht, J. Maeda, C. N. Maesano, C. Mariani, J. Maricic, F. Marie, J. J. Martinez, J. Martino, T. Matsubara, D. McKee, F. Meigner, G. Mention, A. Meregaglia, J. P. Meyer, T. Miletic, R. Milincic, J. F. Millot, A. Minotti, V. Mirones, H. Miyata, Th. A. Mueller, Y. Nagasaka, K. Nakajima, D. Navas-Nicolás, Y. Nikitenko, P. Novella, L. Oberauer, M. Obolensky, A. Onillon, A. Oralbaev, I. Ostrovskiy, C. Palomares, S. J. M. Peeters, I. M. Pepe, S. Perasso, P. Perrin, P. Pfahler, A. Porta, G. Pronost, J. C. Puras, R. Quéval, J. L. Ramirez, J. Reichenbacher, B. Reinhold, M. Reissfelder, A. Remoto, D. Reyna, I. Rodriguez, M. Röhling, R. Roncin, N. Rudolf, B. Rybolt, Y. Sakamoto, R. Santorelli, F. Sato, U. Schwan, S. Schönert, S. Schoppmann, L. Scola, M. Settimo, M. A. Shaevitz, R. Sharankova, V. Sibille, J.-L. Sida, V. Sinev, D. Shrestha, M. Skorokhvatov, P. Soldin, J. Spitz, A. Stahl, I. Stancu, P. Starzynski, M. R. Stock, L. F. F. Stokes, M. Strait, A. Stüken, F. Suekane, S. Sukhotin, T. Sumiyoshi, Y. Sun, Z. Sun, R. Svoboda, H. Tabata, N. Tamura, K. Terao, A. Tonazzo, F. Toral, M. Toups, H. Trinh Thi, F. Valdivia, G. Valdiviesso, N. Vassilopoulos, A. Verdugo, C. Veyssiere, B. Viaud, D. Vignaud, M. Vivier, S. Wagner, C. Wiebusch, B. White, L. Winslow, M. Worcester, M. Wurm, J. Wurtz, G. Yang, J. Yáñez, F. Yermia, and K. Zbiri

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract This article describes the setup and performance of the near and far detectors in the Double Chooz experiment. The electron antineutrinos of the Chooz nuclear power plant were measured in two identically designed detectors with different average baselines of about 400 m and 1050 m from the two reactor cores. Over many years of data taking the neutrino signals were extracted from interactions in the detectors with the goal of measuring a fundamental parameter in the context of neutrino oscillation, the mixing angle $$\theta _{13}$$ θ 13 . The central part of the Double Chooz detectors was a main detector comprising four cylindrical volumes filled with organic liquids. From the inside towards the outside there were volumes containing gadolinium-loaded scintillator, gadolinium-free scintillator, a buffer oil and, optically separated, another liquid scintillator acting as veto system. Above this main detector an additional outer veto system using plastic scintillator strips was installed. The technologies developed in Double Chooz were inspiration for several other antineutrino detectors in the field. The detector design allowed implementation of efficient background rejection techniques including use of pulse shape information provided by the data acquisition system. The Double Chooz detectors featured remarkable stability, in particular for the detected photons, as well as high radiopurity of the detector components.

Published
2022
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2. Extensive Study of the Quality of Fission Yields from Experiment, Evaluation and GEF for Antineutrino Studies and Applications

Author

K. Kern, T. Shiba, S. Cormon, A. Cucoanes, K.-H. Schmidt, M. Estienne, Ch. Schmitt, Beatriz Jurado, Muriel Fallot, Laboratoire de physique subatomique et des technologies associées (SUBATECH), 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), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Fission, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Spectral line, Nuclear physics, antineutrino: production, Daya Bay, 0103 physical sciences, antineutrino: nuclear reactor, fission, Neutron, Nuclide, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, nuclide: radioactivity, Physics, Fission products, antineutrino: spectrum, Spectrometer, 010308 nuclear & particles physics, Nuclear data, Observable, semileptonic decay, antineutrino: energy spectrum, 3. Good health, quality, data management
Abstract

The understanding of the antineutrino production in fission and the theoretical calculation of their energy spectra in different types of fission reactors rely on the application of the summation method, where the individual contributions from the different radioactive nuclides that undergo a beta decay are estimated and summed up. The most accurate estimation of the independent fission-product yields is essential to this calculation. We have coupled for the first time the predictions of the general fission model GEF for the fission yields to fission-product beta-decay data in a summation calculation of reactor antineutrino energy spectra. The first comparisons performed between the spectra from GEF and those obtained with the evaluated nuclear databases exhibited large discrepancies that highlighted the exigency of the modelisation of the antineutrino spectra and showing their usefulness in the evaluation of nuclear data. Additional constraints for the GEF model were thus needed in order to reach the level of accuracy required. The quality of different sources of information on the fission yields has been investigated with GEF, and the benefit of a combined analysis is demonstrated. The quality of fission yields emerging from different experimental techniques has been analyzed and indications for shortcomings of mass yields for some of the studied fissioning systems were provided. The combination of a careful study of the independent isotopic yields and the adjunction of the LOHENGRIN fission-yield data as additional constraints led to a substantially improved agreement between the antineutrino spectra computed with GEF and with the evaluated data. The comparison of inverse beta-decay yields computed with GEF with those measured by the Daya Bay experiment shows the excellent level of predictiveness of the GEF model for the fundamental or applied antineutrino physics., 88 pages, 100 figures

Published
2021

3. Total Absorption Spectroscopy of Fission Fragments Relevant for Reactor Physics and Nuclear Structure and Astrophysics

Author

Magali Estienne, V. Guadilla, M. Fallot, A. Algora, J. L. Taín, A. Porta, L. Giot, J. A. Briz, V. M. Bui, S. Cormon, D. Jordan, L. Le Meur, S. Rice, E. Valencia, A.-A. Zakari-Issoufou, J. Agramunt, J. Äystö, A. Cucoanes, T. Eronen, L. M. Fraile, E. Ganioglu, W. Gelletly, D. Gorelov, J. Hakala, A. Jokinen, A. Kankainen, V. Kolhinen, J. Koponen, M. Lebois, T. Martinez, M. Monserrate, A. Montaner-Pizá, I. Moore, E. Nácher, S. E. A. Orrigo, H. Penttilä, S. Péru, I. Pohjalainen, J. Reinikainen, M. Reponen, S. Rinta-Antila, B. Rubio, K. Rytkönen, T. Shiba, V. Sonnenschein, A. A. Sonzogni, V. Vedia, A. Voss, and J. N. Wilson

Subjects
General Medicine
Abstract

The accurate determination of reactor antineutrino spectra remains a very hot research topic, where new questions have emerged in recent years. Indeed, after the “reactor anomaly” – a deficit of measured antineutrinos at short baseline reactor experiments with respect to spectral predictions – the three international reactor neutrino experiments Double Chooz, Daya Bay and Reno have evidenced spectral distortions in their measurements with respect to the same spectral predictions. This puzzle is called the “shape anomaly”. Recently summation calculations of reactor antineutrino spectra based on the use of nuclear data have obtained the best agreement to date with the reactor neutrino flux measurements at the level of 2% thanks to a decade of Total Absorption Gamma-ray Spectroscopy (TAGS) measurements at the radioactive beam facility of the University of Jyväskylä in two experimental campaigns. A selection of the results obtained so far is presented.

Published
2023

4. Impact of the Most Recent Total Absorption Gamma-ray Spectroscopy Data for Fission Fragments on Reactor Antineutrino Spectra and Comparison with the Daya Bay Results

Author

Muriel Fallot, S. Cormon, W. Gelletly, A.-A. Zakari-Issoufou, Lydie Giot, J. Briz-Monago, D. Jordan, B. Rubio, V. Guadilla, V. M. Bui, M. Estienne, E. Valencia, Amanda Porta, L. Le Meur, A. Algora, Stephen Rice, J. L. Tain, Laboratoire de physique subatomique et des technologies associées (SUBATECH), 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), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)

Subjects
Physics, History, 010308 nuclear & particles physics, Fission, Daya bay, Analytical chemistry, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Spectral line, Computer Science Applications, Education, 0103 physical sciences, Gamma spectroscopy, Nuclear Experiment, 010306 general physics, Absorption (electromagnetic radiation)
Abstract

The accurate determination of reactor antineutrino spectra is still a challenge. In 2017 the Daya Bay experiment has measured the evolution of the antineutrino flux with the fuel content of the reactor core. The observed deficit of the detected flux compared with the predictions of the conversion model was almost totally explained by the data arising from the fissions of 235U while the part dominated by the fission of 239Pu was in good agreement with the conversion model. The TAGS collaboration has carried out two experimental campaigns during the last decade at the JYFLTRAP of Jyväskylä (Finland) measuring a large set of data in order to improve the quality of the predictions of our summation method. These measurements allow the correction of the nuclear data for the Pandemonium effect, thus making an important contribution to calculating the antineutrino spectra. The impact of these ten years of measurement from our collaboration on the predicted antineutrino energy spectrum and flux are shown using our summation calculations. The results are compared with the Daya Bay measurements showing the best agreement in shape (in the antineutrino energy range 2 to 5 MeV) and in flux obtained so far with a model. The flux deficit observed by Daya Bay with respect to the summation method is now reduced to 1.9% leaving little room for the reactor anomaly. The shape anomaly between 5 and 7 MeV in antineutrino energy is still observed and remains unexplained.

Published
2020

5. Summation Calculations for Reactor Antineutrino Spectra, Decay Heat and Delayed Neutron Fractions Involving New TAGS Data and Evaluated Databases

Author

T. Shiba, M. Monserrate, L. Giot, M. Fallot, W. Gelletly, Juha Äystö, A. Cucoanes, Iain Moore, L. M. Fraile, M. Reponen, Jani Hakala, Anu Kankainen, S. E. A. Orrigo, José Antonio Briz, Veli Kolhinen, V. Vedia, Sami Rinta-Antila, C. Weber, Jukka Koponen, Enrique Nácher, Dmitry Gorelov, T. Martinez, Jorge Agramunt, M. Estienne, Annika Voss, J. L. Tain, E. Valencia, E. Ganogliu, J. N. Wilson, M. Lebois, A. Porta, V. Guadilla-Gomez, Tommi Eronen, K. Rytkönen, Ari Jokinen, L. Le Meur, A. Algora, Ilkka Pohjalainen, S. Cormon, A. Montaner-Pizá, Berta Rubio, M. D. Jordan, Heikki Penttilä, Volker Sonnenschein, A.-A. Zakari-Issoufou, Alejandro Sonzogni, Juuso Reinikainen, 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), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Serot, O., Chebboubi, A., Helsinki Institute of Physics, 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), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and SCOAP

Subjects
Nuclear fission product, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Fission, QC1-999, Nuclear Theory, 114 Physical sciences, 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, SPECTROMETER, Gamma spectroscopy, Decay heat, 010306 general physics, Nuclear Experiment, Physics, [PHYS]Physics [physics], Fission products, 010308 nuclear & particles physics, Nuclear data, Física nuclear, High Energy Physics::Experiment, Delayed neutron, Radioactive decay
Abstract

9 pags., 3 figs. -- Open Access funded by Creative Commons Atribution Licence 4.0, Three observables of interest for present and future reactors depend on the β decay properties of the fission products: antineutrinos from reactors, the reactor decay heat and delayed neutron emission. In these proceedings, we present new results from summation calculations of the first two quantities quoted above, performed with evolved independent yields coupled with fission product decay data, from various nuclear data bases or models. New TAGS results from the latest experiment of the TAGS collaboration at the JYFL facility of Jyväskylä will be displayed as well as their impact on the antineutrino spectra and the decay heat associated to fission pulses of the main actinides.

Published
2018

6. Total absorption spectroscopy of fission fragments relevant for reactor antineutrino spectra

Author

T. Martinez, Muriel Fallot, E. Estevez, Iain Moore, J. N. Wilson, L. Batist, Anu Kankainen, W. Gelletly, Amanda Porta, Veli Kolhinen, A. Cucoanes, Alejandro Sonzogni, M. Bowry, Juuso Reinikainen, L. M. Fraile, F. G. Kondev, D. Cano-Ott, Jukka Koponen, V. Gorlychev, Pasi Karvonen, Michael Fleming, F. Molina, Enrique Nácher, E. Mendoza, J. A. Briz, A. Perez, A. Montaner-Pizá, Tommi Eronen, Dmitry Gorelov, Juha Äystö, Ari Jokinen, Mikael Reponen, Juho Rissanen, V. Guadilla, Annika Voss, B. Rubio, L. Le Meur, M. B. Gómez-Hornillos, P. J. R. Mason, E. Ganogliu, Volker Sonnenschein, Jorge Agramunt, V. Vedia, A.-A. Zakari-Issoufou, Sami Rinta-Antila, R. Caballero-Folch, C. Weber, P. H. Regan, J. L. Tain, M. Estienne, M. D. Jordan, M. Monserrate, M. Lebois, Heikki Penttilä, Viki-Veikko Elomaa, V. M. Bui, E. Valencia, Ilkka Pohjalainen, A. Algora, Jani Hakala, Stephen Rice, T. Shiba, S.E.A. Orrigo, A. R. García, Jean-Christophe Sublet, S. Cormon, G. F. Farrelly, Zs. Podolyák, 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), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Plompen, A, Hambsch, FJ, Schillebeeckx, P, Mondelaers, W, Heyse, J, Kopecky, S, Siegler, P, Oberstedt, S, Helsinki Institute of Physics, 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), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Plompen, A., Hambsch, F.-J., Schillebeeckx, P., Mondelaers, W., Heyse, J., Kopecky, S., Siegler, P., Oberstedt, S., Laboratoire de physique subatomique et des technologies associées ( SUBATECH ), IMT Atlantique Bretagne-Pays de la Loire ( IMT Atlantique ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Nantes ( UN ), Institut de Physique Nucléaire d'Orsay ( IPNO ), and Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Total absorption spectroscopy, Fission, QC1-999, CHOOZ, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, 114 Physical sciences, Spectral line, law.invention, Physics::Geophysics, Nuclear physics, law, nuclear masses, 0103 physical sciences, structure, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Physics, Fission products, ta114, 010308 nuclear & particles physics, Pressurized water reactor, Nuclear data, Pandemonium effect, PRODUCTS, 13. Climate action, decay data measurements
Abstract

International audience; The accurate determination of reactor antineutrino spectra remains a very active research topic for which new methods of study have emerged in recent years. Indeed, following the long-recognized reactor anomaly (measured antineutrino deficit in short baseline reactor experiments when compared with spectral predictions), the three international reactor neutrino experiments Double Chooz, Daya Bay and Reno have recently demonstrated the existence of spectral distortions in their measurements with respect to the same predictions. These spectral predictions were obtained through the conversion of integral beta-energy spectra obtained at the ILL research reactor. Several studies have shown that the underlying nuclear physics required for the conversion of these spectra into antineutrino spectra is not totally understood. An alternative to such converted spectra is a complementary approach that consists of determining the antineutrino spectrum by means of the measurement and processing of nuclear data. The beta properties of some key fission products suffer from the pandemonium effect which can be circumvented by the use of the Total Absorption Gamma-ray Spectroscopy technique (TAGS). The two main contributors to the Pressurized Water Reactor antineutrino spectrum in the region where the spectral distortion has been observed are 92Rb and 142Cs, which have been measured at the radioactive beam facility of the University of Jyväskylä in two TAGS experiments. We present the results of the analysis of the TAGS measurements of the β-decay properties of 92Rb along with preliminary results on 142Cs and report on the measurements already performed.

Published
2016

7. Total Absorption Spectroscopy Study ofRb92Decay: A Major Contributor to Reactor Antineutrino Spectrum Shape

Author

Tommi Eronen, Pasi Karvonen, Muriel Fallot, T. Martinez, V. Gorlychev, T. Shiba, V.-V. Elomaa, E. Mendoza, P. H. Regan, S. Cormon, M. Reponen, R. Caballero-Folch, Juha Äystö, Juho Rissanen, A. A. Sonzogni, A. B. Perez-Cerdan, E. Valencia, M. D. Jordan, Christoph Weber, M. B. Gómez-Hornillos, A. Cucoanes, Iain Moore, F. G. Kondev, Anu Kankainen, A.-A. Zakari-Issoufou, Alejandro Algora, Veli Kolhinen, M. Estienne, M. Bowry, D. Cano-Ott, F. Molina, J. Agramunt, Heikki Penttilä, V. M. Bui, J. L. Tain, E. Estevez, B. Rubio, Stephen Rice, A. R. García, Jani Hakala, G. F. Farrelly, Zs. Podolyák, J. A. Briz, W. Gelletly, Ari Jokinen, and Amanda Porta

Subjects
Semileptonic decay, Physics, Total absorption spectroscopy, Fission, General Physics and Astronomy, chemistry.chemical_element, Beta decay, Spectral line, Rubidium, Nuclear physics, chemistry, Double beta decay, Atomic physics, Absorption (electromagnetic radiation)
Abstract

The antineutrino spectra measured in recent experiments at reactors are inconsistent with calculations based on the conversion of integral beta spectra recorded at the ILL reactor. (92)Rb makes the dominant contribution to the reactor antineutrino spectrum in the 5-8 MeV range but its decay properties are in question. We have studied (92)Rb decay with total absorption spectroscopy. Previously unobserved beta feeding was seen in the 4.5-5.5 region and the GS to GS feeding was found to be 87.5(25)%. The impact on the reactor antineutrino spectra calculated with the summation method is shown and discussed.

Published
2015

8. Total Absorption Spectroscopy Study of (92)Rb Decay: A Major Contributor to Reactor Antineutrino Spectrum Shape

Author

A-A, Zakari-Issoufou, M, Fallot, A, Porta, A, Algora, J L, Tain, E, Valencia, S, Rice, V M, Bui, S, Cormon, M, Estienne, J, Agramunt, J, Äystö, M, Bowry, J A, Briz, R, Caballero-Folch, D, Cano-Ott, A, Cucoanes, V-V, Elomaa, T, Eronen, E, Estévez, G F, Farrelly, A R, Garcia, W, Gelletly, M B, Gomez-Hornillos, V, Gorlychev, J, Hakala, A, Jokinen, M D, Jordan, A, Kankainen, P, Karvonen, V S, Kolhinen, F G, Kondev, T, Martinez, E, Mendoza, F, Molina, I, Moore, A B, Perez-Cerdán, Zs, Podolyák, H, Penttilä, P H, Regan, M, Reponen, J, Rissanen, B, Rubio, T, Shiba, A A, Sonzogni, and C, Weber

Abstract

The antineutrino spectra measured in recent experiments at reactors are inconsistent with calculations based on the conversion of integral beta spectra recorded at the ILL reactor. (92)Rb makes the dominant contribution to the reactor antineutrino spectrum in the 5-8 MeV range but its decay properties are in question. We have studied (92)Rb decay with total absorption spectroscopy. Previously unobserved beta feeding was seen in the 4.5-5.5 region and the GS to GS feeding was found to be 87.5(25)%. The impact on the reactor antineutrino spectra calculated with the summation method is shown and discussed.

Published
2015

9. Determination of the Sensitivity of the Antineutrino Probe for Reactor Core Monitoring

Author

A. Cucoanes, A. Onillon, Muriel Fallot, A.-A. Zakari-Issoufou, V.M. Bui, M. Estienne, T. Shiba, F. Yermia, M. Lenoir, S. Cormon, Laboratoire SUBATECH Nantes (SUBATECH), and 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)

Subjects
Physics, Nuclear and High Energy Physics, Nuclear fission product, [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Xenon-135, Nuclear reactor, 7. Clean energy, Fast fission, Thorium fuel cycle, law.invention, Physics::Geophysics, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Nuclear physics, Nuclear reactor core, 13. Climate action, law, Physics::Plasma Physics, Uranium-233, Physics::Chemical Physics, Long-lived fission product, Nuclear Experiment
Abstract

This paper presents a feasibility study of the use of the detection of reactor-antineutrinos ( ν ¯ e ) for non proliferation purpose. To proceed, we have started to study different reactor designs with our simulation tools. We use a package called MCNP Utility for Reactor Evolution (MURE), initially developed by CNRS/IN2P3 labs to study Generation IV reactors. The MURE package has been coupled to fission product beta decay nuclear databases for studying reactor antineutrino emission. This method is the only one able to predict the antineutrino emission from future reactor cores, which don't use the thermal fission of 235 U, 239 Pu and 241 Pu. It is also the only way to include off-equilibrium effects, due to neutron captures and time evolution of the fission product concentrations during a reactor cycle. We will present here the first predictions of antineutrino energy spectra from innovative reactor designs (Generation IV reactors). We will then discuss a summary of our results of non-proliferation scenarios involving the latter reactor designs, taking into account reactor physics constraints.

Published
2014

10. Contribution of recently measured nuclear data to reactor antineutrino energy spectra predictions

Author

D. Jordan, Lydie Giot, A.-A. Zakari-Issoufou, A. Remoto, G. Pronost, J. L. Tain, A. Onillon, Muriel Fallot, J. Martino, A. Algora, V.M. Bui, S. Cormon, F. Yermia, M. Elnimr, A. Cucoanes, M. Estienne, Amanda Porta, Laboratoire SUBATECH Nantes (SUBATECH), and 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)

Subjects
Semileptonic decay, Particle physics, Nuclear and High Energy Physics, Nuclear fission product, [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Fission, QC1-999, 01 natural sciences, 7. Clean energy, Physics::Geophysics, Nuclear physics, 0103 physical sciences, Plutonium-241, 010306 general physics, Neutrino oscillation, Nuclear Experiment, Physics, Fission products, 010308 nuclear & particles physics, Nuclear data, Beta decay, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Uranium-238, Uranium-235, High Energy Physics::Experiment, Anomaly (physics), Neutrino
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 θ 13 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 235 U, and 239;241 Pu, 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.

Published
2013

11. Measurement of Volatile Radionuclides Production and Release Yields followed by a Post-Irradiation Analysis of a Pb/Bi Filled Ta Target at ISOLDE

Author

Thierry Stora, Y. Foucher, H. Ravn, S. Leray, Jean-Christophe David, Y. Tall, Arnaud Guertin, H. Frånberg, Etam Noah, N. Thiollière, L. Zanini, M. Fallot, F. Gröschel, Martin Andersson, Enzo Manfrin, Michael Wohlmuther, T. Kirchner, Ulli Köster, K. Berg, S. Cormon, Institut Laue-Langevin (ILL), ILL, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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), European Organization for Nuclear Research (CERN), European Spallation Source (ESS), European Spallation Source, Département de Physique Nucléaire (ex SPhN) (DPHN), 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, Paul Scherrer Institute (PSI), 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), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Materials science, Isotope, Proton, 010308 nuclear & particles physics, Tantalum, chemistry.chemical_element, Nuclear data, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, chemistry, 0103 physical sciences, Neutron, Spallation, Irradiation, 010306 general physics, Eutectic system
Abstract

International audience; A crucial requirement in the development of liquid-metal spallation neutron target is knowledge of the composition and amount of volatile radionuclides that are released from the target during operation. It is also important to know the total amount produced, which could be released if there was an accident. One type is the lead-bismuth eutectic (LBE) target where different radionuclides can be produced following interaction with a high-energy proton beam, notably noble gases (Ar, Kr, Xe isotopes) and other relative volatile isotopes such as Hg and At. The results of an irradiation experiment performed at ISOLDE on a LBE target are compared with predictions from the MCNPX code using the latest developments on the Li'ege Intranuclear Cascade model (INCL4.6) and the CEM03 model. The calculations are able to reproduce the mass distribution of the radioisotopes produced, including the At production, where there is a significant contribution from secondary reactions. Subsequently, a post-irradiation examination of the irradiated target was performed. Investigations of both the tantalum target structure, in particular the beam window, and the leadbismuth eutectic were performed using several experimental techniques. No sign of severe irradiation damage, previously observed in other ISOLDE targets, was found.

Published
2013

12. Total Absorption Spectroscopy of Fission Fragments Relevant for Reactor Antineutrino Spectra and Decay Heat Calculations

Author

Iain Moore, Anu Kankainen, A.-A. Zakari-Issoufou, Veli Kolhinen, R. Caballero-Folch, G. F. Farrelly, Zs. Podolyák, T. Shiba, J. L. Tain, F. Molina, Stephen Rice, F. G. Kondev, D. Cano-Ott, Juha Äystö, V.M. Bui, Jani Hakala, Mikael Reponen, M. D. Jordan, Heikki Penttilä, Tommi Eronen, E. Valencia, Muriel Fallot, A. B. Perez-Cerdan, T. Martinez, M. Bowry, E. Estevez, W. Gelletly, M. B. Gómez-Hornillos, V. Gorlychev, S. Cormon, V.-V. Elomaa, A. R. García, Jorge Agramunt, Alejandro Sonzogni, Pasi Karvonen, A. Cucouanes, Christoph Weber, P. H. Regan, Berta Rubio, J. A. Briz, Juho Rissanen, M. Estienne, Amanda Porta, E. Mendoza, Ari Jokinen, A. Algora, Laboratoire de physique subatomique et des technologies associées (SUBATECH), 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), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), and Helsinki Institute of Physics

Subjects
Total absorption spectroscopy, Fission, QC1-999, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 114 Physical sciences, 7. Clean energy, 01 natural sciences, Physics::Geophysics, Nuclear physics, rubidium, 0103 physical sciences, fission products, Decay heat, Nuclear Experiment, 010306 general physics, Fission products, Decay scheme, ta114, 010308 nuclear & particles physics, Chemistry, Physics, Xenon-135, Beta decay, 13. Climate action, decay heat, High Energy Physics::Experiment, beta decay, antineutrino emission, Neutrino
Abstract

Volume: 111 Host publication title: WONDER-2015 Host publication sub-title: 4TH INTERNATIONAL WORKSHOP ON NUCLEAR DATA EVALUATION FOR REACTOR APPLICATIONS Isbn(print): 978-2-7598-1970-6 Beta decay of fission products is at the origin of decay heat and antineutrino emission in nuclear reactors. Decay heat represents about 7% of the reactor power during operation and strongly impacts reactor safety. Reactor antineutrino detection is used in several fundamental neutrino physics experiments and it can also be used for reactor monitoring and non-proliferation purposes. Rb-92,Rb-93 are two fission products of importance in reactor antineutrino spectra and decay heat, but their beta-decay properties are not well known. New measurements of Rb-92,Rb-93 beta-decay properties have been performed at the IGISOL facility (Jyvaskyla, Finland) using Total Absorption Spectroscopy (TAS). TAS is complementary to techniques based on Germanium detectors. It implies the use of a calorimeter to measure the total gamma intensity de-exciting each level in the daughter nucleus providing a direct measurement of the beta feeding. In these proceedings we present preliminary results for Rb-93, our measured beta feedings for Rb-92 and we show the impact of these results on reactor antineutrino spectra and decay heat calculations.

Published
2016

13. Indication of Reactorν¯eDisappearance in the Double Chooz Experiment

Author

A. Cucoanes, F. Ardellier, M. Obolensky, M. Dracos, H. de Kerret, D. Shrestha, R. Svoboda, C. L. Jones, J. Maeda, I. Ostrovskiy, R. Santorelli, A. Tonazzo, C. Jollet, M. Franke, A. F. Barbosa, T. Hayakawa, J. Tm. Goon, I. Gil-Botella, Daniel M. Kaplan, G. Keefer, J.V. Dawson, R. Milincic, Tobias Lachenmaier, C. E. Lane, B. Guillon, J. Reichenbacher, J. Spitz, M. Worcester, N. Tamura, M. Dierckxsens, M. Cribier, J. Haser, G. Mention, H. Miyata, M. Kuze, K. Nakajima, C. Langbrandtner, J. Hartnell, Z. Sun, Christian Buck, H. P. Lima, M. Cerrada, C. Aberle, Yasushi Nagasaka, S. Cormon, Muriel Fallot, T. Classen, E. Kemp, J. Busenitz, Janet Conrad, E. Damon, S. Perasso, S. Roth, C. N. Maesano, C. Mariani, Th. A. Mueller, E. Caden, A. Onillon, W. Potzel, T. Kawasaki, D. Dietrich, Matthew L Strait, A. Hatzikoutelis, M. D. Skorokhvatov, Michael Wurm, H. Watanabe, A. Bernstein, Florian Kaether, Y. Kibe, J. Felde, Z. Djurcic, A. Osborn, A. Milzstajn, D. Franco, C. Palomares, K. Zbiri, D. E. Reyna, S. M. Fernandes, Yu. Efremenko, M. Bongrand, Ying Sun, Alain Letourneau, L. Bezrukhov, T.J.C. Bezerra, U. Schwan, Kazuhiro Terao, Yuri Kamyshkov, F. von Feilitzsch, Caren Hagner, R. Gama, Amanda Porta, H. H. Trinh Thi, T. Miletic, P. Perrin, A. Meregaglia, D. Kryn, J. Maricic, Christopher Wiebusch, J. M. LoSecco, David Lhuillier, Lothar Oberauer, Bayarto Lubsandorzhiev, B. White, P.-J. Chang, Masaki Ishitsuka, E. Falk, M. Elnimr, Thierry Lasserre, V. V. Sinev, M. Göger-Neff, H. Furuta, G. A. Horton-Smith, M. C. Goodman, F. Yermia, V. Durand, Lindley Winslow, Anatael Cabrera, F. X. Hartmann, E. Yanovitch, Y. Sakamoto, H. A. Rubin, Michael Hofmann, B. Reinhold, F. Sato, M. H. Shaevitz, Luis González, Nathaniel Bowden, Thomas Schwetz, E. Conover, H. Tabata, J. C. dos Anjos, V. Zimmer, L.N. Kalousis, M. Toups, I. M. Pepe, A. Baxter, A. Stüken, Steven Dazeley, R. Carr, D. Greiner, Yoshio Abe, L. Camilleri, Lydie Giot, M. V. d'Agostino, J. Martino, Sebastian Wagner, Manfred Lindner, Antoine Collin, E. Blucher, M. Röhling, S. Schönert, Y. Endo, P. Pfahler, M. Fechner, P. Chimenti, A.V. Etenko, T. Matsubara, J. M. López-Castanõ, I. Stancu, S. J. M. Peeters, T. Akiri, Stefan Schoppmann, D. Mckee, T. Haruna, Yehan Liu, T. Konno, A. Remoto, F. Suekane, P. Novella, T. Sumiyoshi, D. Motta, T. Hara, A. Stahl, J. L. Sida, R. Queval, M. Bergevin, J. Jochum, K. Crum, A. J. Franke, S. V. Sukhotin, J. I. Crespo-Anadón, E. Smith, N. Haag, S. Lucht, and C. Veyssiere

Subjects
NOνA, Physics, Particle physics, Muon, 010308 nuclear & particles physics, General Physics and Astronomy, Flux, Daya Bay Reactor Neutrino Experiment, CHOOZ, 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, 010306 general physics, Neutrino oscillation, Electron neutrino
Abstract

The Double Chooz experiment presents an indication of reactor electron antineutrino disappearance consistent with neutrino oscillations. An observed-to-predicted ratio of events of 0.944±0.016(stat)±0.040(syst) was obtained in 101 days of running at the Chooz nuclear power plant in France, with two 4.25GWth reactors. The results were obtained from a single 10m3 fiducial volume detector located 1050 m from the two reactor cores. The reactor antineutrino flux prediction used the Bugey4 flux measurement after correction for differences in core composition. The deficit can be interpreted as an indication of a nonzero value of the still unmeasured neutrino mixing parameter sin⁡22θ13. Analyzing both the rate of the prompt positrons and their energy spectrum, we find sin⁡22θ13=0.086±0.041(stat)±0.030(syst), or, at 90% C.L., 0.017

Published
2012

14. Indication of reactor ν(e) disappearance in the Double Chooz experiment

Author

Y, Abe, C, Aberle, T, Akiri, J C, dos Anjos, F, Ardellier, A F, Barbosa, A, Baxter, M, Bergevin, A, Bernstein, T J C, Bezerra, L, Bezrukhov, E, Blucher, M, Bongrand, N S, Bowden, C, Buck, J, Busenitz, A, Cabrera, E, Caden, L, Camilleri, R, Carr, M, Cerrada, P-J, Chang, P, Chimenti, T, Classen, A P, Collin, E, Conover, J M, Conrad, S, Cormon, J I, Crespo-Anadón, M, Cribier, K, Crum, A, Cucoanes, M V, D'Agostino, E, Damon, J V, Dawson, S, Dazeley, M, Dierckxsens, D, Dietrich, Z, Djurcic, M, Dracos, V, Durand, Y, Efremenko, M, Elnimr, Y, Endo, A, Etenko, E, Falk, M, Fallot, M, Fechner, F, von Feilitzsch, J, Felde, S M, Fernandes, D, Franco, A J, Franke, M, Franke, H, Furuta, R, Gama, I, Gil-Botella, L, Giot, M, Göger-Neff, L F G, Gonzalez, M C, Goodman, J T M, Goon, D, Greiner, B, Guillon, N, Haag, C, Hagner, T, Hara, F X, Hartmann, J, Hartnell, T, Haruna, J, Haser, A, Hatzikoutelis, T, Hayakawa, M, Hofmann, G A, Horton-Smith, M, Ishitsuka, J, Jochum, C, Jollet, C L, Jones, F, Kaether, L, Kalousis, Y, Kamyshkov, D M, Kaplan, T, Kawasaki, G, Keefer, E, Kemp, H, de Kerret, Y, Kibe, T, Konno, D, Kryn, M, Kuze, T, Lachenmaier, C E, Lane, C, Langbrandtner, T, Lasserre, A, Letourneau, D, Lhuillier, H P, Lima, M, Lindner, Y, Liu, J M, López-Castanõ, J M, LoSecco, B K, Lubsandorzhiev, S, Lucht, D, McKee, J, Maeda, C N, Maesano, C, Mariani, J, Maricic, J, Martino, T, Matsubara, G, Mention, A, Meregaglia, T, Miletic, R, Milincic, A, Milzstajn, H, Miyata, D, Motta, Th A, Mueller, Y, Nagasaka, K, Nakajima, P, Novella, M, Obolensky, L, Oberauer, A, Onillon, A, Osborn, I, Ostrovskiy, C, Palomares, S J M, Peeters, I M, Pepe, S, Perasso, P, Perrin, P, Pfahler, A, Porta, W, Potzel, R, Queval, J, Reichenbacher, B, Reinhold, A, Remoto, D, Reyna, M, Röhling, S, Roth, H A, Rubin, Y, Sakamoto, R, Santorelli, F, Sato, S, Schönert, S, Schoppmann, U, Schwan, T, Schwetz, M H, Shaevitz, D, Shrestha, J-L, Sida, V, Sinev, M, Skorokhvatov, E, Smith, J, Spitz, A, Stahl, I, Stancu, M, Strait, A, Stüken, F, Suekane, S, Sukhotin, T, Sumiyoshi, Y, Sun, Z, Sun, R, Svoboda, H, Tabata, N, Tamura, K, Terao, A, Tonazzo, M, Toups, H H, Trinh Thi, C, Veyssiere, S, Wagner, H, Watanabe, B, White, C, Wiebusch, L, Winslow, M, Worcester, M, Wurm, E, Yanovitch, F, Yermia, K, Zbiri, and V, Zimmer

Abstract

The Double Chooz experiment presents an indication of reactor electron antineutrino disappearance consistent with neutrino oscillations. An observed-to-predicted ratio of events of 0.944±0.016(stat)±0.040(syst) was obtained in 101 days of running at the Chooz nuclear power plant in France, with two 4.25 GW(th) reactors. The results were obtained from a single 10 m(3) fiducial volume detector located 1050 m from the two reactor cores. The reactor antineutrino flux prediction used the Bugey4 flux measurement after correction for differences in core composition. The deficit can be interpreted as an indication of a nonzero value of the still unmeasured neutrino mixing parameter sin(2)2θ(13). Analyzing both the rate of the prompt positrons and their energy spectrum, we find sin(2)2θ(13)=0.086±0.041(stat)±0.030(syst), or, at 90% C.L., 0.017sin(2)2θ(13)0.16.

Published
2012

15. New antineutrino energy spectra predictions from the summation of beta decay branches of the fission products

Author

Muriel Fallot, D. Jordan, S. Cormon, A. Cucoanes, M. Elnimr, A. Onillon, F. Yermia, Lydie Giot, Amanda Porta, A. Remoto, Alejandro Algora, V.M. Bui, J. L. Tain, M. Estienne, J. Martino, A.-A. Zakari-Issoufou, G. Pronost, Laboratoire SUBATECH Nantes (SUBATECH), and 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)

Subjects
Fission, FOS: Physical sciences, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Double beta decay, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Absorption (logic), Nuclear Experiment (nucl-ex), Decay heat, 010306 general physics, Nuclear Experiment, Physics, Fission products, Isotope, 010308 nuclear & particles physics, Pandemonium effect, Beta decay, 3. Good health, High Energy Physics - Phenomenology, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Física nuclear
Abstract

In this paper, we study the impact of the inclusion of the recently measured beta decay properties of the $^{102;104;105;106;107}$Tc, $^{105}$Mo, and $^{101}$Nb nuclei in an updated calculation of the antineutrino energy spectra of the four fissible isotopes $^{235, 238}$U, and $^{239,241}$Pu. These actinides are the main contributors to the fission processes in Pressurized Water Reactors. The beta feeding probabilities of the above-mentioned Tc, Mo and Nb isotopes have been found to play a major role in the $\gamma$ component of the decay heat of $^{239}$Pu, solving a large part of the $\gamma$ discrepancy in the 4 to 3000\,s range. They have been measured using the Total Absorption Technique (TAS), avoiding the Pandemonium effect. The calculations are performed using the information available nowadays in the nuclear databases, summing all the contributions of the beta decay branches of the fission products. Our results provide a new prediction of the antineutrino energy spectra of $^{235}$U, $^{239,241}$Pu and in particular of $^{238}$U for which no measurement has been published yet. We conclude that new TAS measurements are mandatory to improve the reliability of the predicted spectra., Comment: 10 pages, 2 figures

Published
2012

16. Improved Predictions of Reactor Antineutrino Spectra

Author

F. Yermia, G. Mention, Muriel Fallot, Amanda Porta, M. Fechner, Lydie Giot, Alain Letourneau, S. Cormon, David Lhuillier, J. Martino, T. Lasserre, Th. A. Mueller, Département de Physique Nucléaire (ex SPhN) (DPHN), 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, Laboratoire SUBATECH Nantes (SUBATECH), 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), APC - Neutrinos, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), 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), 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), 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)), 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)-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)-Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), and 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)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Fission products, 010308 nuclear & particles physics, Fission, Ab initio, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Uranium-238, 0103 physical sciences, Plutonium-241, Uranium-235, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Neutrino, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract

We report new calculations of reactor antineutrino spectra including the latest information from nuclear databases and a detailed error budget. The first part of this work is the so-called ab initio approach where the total antineutrino spectrum is built from the sum of all beta-branches of all fission products predicted by an evolution code. Systematic effects and missing information in nuclear databases lead to final relative uncertainties in the 10 to 20% range. A prediction of the antineutrino spectrum associated with the fission of 238U is given based on this ab initio method. For the dominant isotopes 235U and 239Pu, we developed a more accurate approach combining information from nuclear databases and reference electron spectra associated with the fission of 235U, 239Pu and 241Pu, measured at ILL in the 80's. We show how the anchor point of the measured total beta-spectra can be used to suppress the uncertainty in nuclear databases while taking advantage of all the information they contain. We provide new reference antineutrino spectra for 235U, 239Pu and 241Pu isotopes in the 2-8 MeV range. While the shapes of the spectra and their uncertainties are comparable to that of the previous analysis of the ILL data, the normalization is shifted by about +3% on average. In the perspective of the re-analysis of past experiments and direct use of these results by upcoming oscillation experiments, we discuss the various sources of errors and their correlations as well as the corrections induced by off equilibrium effects., Comment: 17 pages, 12 figures. Submitted to Phys. Rev. C

Published
2011
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17. Towards reactor neutrino applied physics

Author

Muriel Fallot, Lydie Giot, D. Lhuillier, A. Letourneau, T. Lasserre, B. Guillon, J. Martino, S. Cormon, M. Cribier, Laboratoire SUBATECH Nantes (SUBATECH), 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), APC - Neutrinos, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), 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), AstroParticule et Cosmologie (APC (UMR_7164)), 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)-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)-Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), 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)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), 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), 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, and 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)

Subjects
Physics, Nuclear fuel, business.industry, Nuclear data, Thermal power station, chemistry.chemical_element, Nuclear reactor, Uranium, Nuclear power, 7. Clean energy, law.invention, Plutonium, Physics::Geophysics, Nuclear physics, chemistry, law, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Neutrino, business, Nuclear Experiment
Abstract

International audience; Nuclear power plants are intense sources of antineutrinos. Their energy spectrum and emitted flux depend on the composition of the nuclear fuel and on the thermal power of the reactor. These properties led to potential applications of neutrino physics: they could be used to non intrusively monitor a nuclear reactor. To this purpose, a better knowledge of the antineutrino energy spectra arising from uranium and plutonium isotope fission is necessary. In these proceedings we relate about on-going simulation efforts aiming at reducing the errors associated to these spectra. The generic tools under development and presented below will allow to perform scenario studies on the feasibility of using antineutrinos to measure thermal power and to test to which precision the fuel composition can be deduced using these particles.

Published
2007

18. Volatile elements production rates in a proton-irradiated molten lead-bismuth target

Author

Y. Tall, S. Cormon, M. Fallot, Y. Foucher, A. Guertin, T. Kirchner, L. Zanini, M. Andersson, K. Berg, H. Frånberg, F. Gröschel, E. Manfrin, W. Wagner, M. Wohlmuther, P. Everaerts, U. Köster, H. Ravn, E. Noah Messomo, C. Jost, Y. Kojima, 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), Institut Laue-Langevin (ILL), and ILL

Subjects
13. Climate action, 010308 nuclear & particles physics, 0103 physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010403 inorganic & nuclear chemistry, 7. Clean energy, 01 natural sciences, 0104 chemical sciences
Abstract

International audience; The IS419 experiment at the ISOLDE facility at CERN dedicated to the measurement of production and release rates of volatile elements from an irradiated Pb/Bi target by a proton beam of 1/1.4 GeV has been completed. The release of He, Ne, Ar, Br, Kr, Cd, I, Xe, Hg, Po and At isotopes was investigated at different target temperatures, ranging from 250 °C to 600 ° C. Three experimental methods were used for the mass-separated, ionized beams: i) implantation of short- and medium-lived isotopes in a tape and on-line detection with a HPGe γ detector; ii) implantation of longer-lived isotopes in Al foils and off-line detection with a HPGe detector; iii) a Faraday Cup used mainly for stable nuclides. The results were compared with predictions from the FLUKA and MCNPX codes using different options for the intra-nuclear cascades and evaporation/fission models. Results show good agreement with calculations for Hg and for noble gases. For other elements such as iodine it is apparent that only a fraction of the produced isotopes is released. The results from FLUKA and MCNPX with the INCL4/ABLA models are in general more satisfactory than those obtained using MCNPX with the standard Bertini/Dresner model combination. Interestingly also significant yields of 204-210At isotopes were observed. At isotopes are produced either by (p, π-xn) charge exchange reactions on 209Bi or by secondary reactions involving 3He and 4He. Despite the non-release of polonium from Pb/Bi targets at typical operation temperatures, a smaller amount of highly radiotoxic Po isotopes can actually be liberated indirectly as decay daughters of the released astatine.

Published
2007

19. Non-proliferation studies with Double Chooz detectors

Author

J. Martino, S. Cormon, Muriel Fallot, Laboratoire SUBATECH Nantes (SUBATECH), 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), and Double-CHOOZ

Subjects
Physics, Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Detector, Flux, CHOOZ, 7. Clean energy, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, law, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Nuclear power plant, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment
Abstract

International audience; The near detector of Double Chooz will provide the most accurate measurement of the spectrum and the flux of the electronic anti-neutrinos () emitted by a nuclear power plant. This enables the collaboration to address certain safeguards issues for the International Atomic Energy Agencyʼs (IAEA) benefit.

Published
2011

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

Author

Estienne M, Fallot M, Algora A, Briz-Monago J, Bui VM, Cormon S, Gelletly W, Giot L, Guadilla V, Jordan D, Le Meur L, Porta A, Rice S, Rubio B, Taín JL, Valencia E, and Zakari-Issoufou AA

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 antineutrino energy spectrum computed with the updated summation method without any renormalization. The results exhibit a better agreement than is obtained with the Huber-Mueller model in the 2-5 MeV range, the region that dominates the detected flux. A systematic trend is found in which the antineutrino flux computed with the summation model decreases with the inclusion of more pandemonium-free data. The calculated 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 room for a 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.

Published
2019
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21. Total Absorption Spectroscopy Study of (92)Rb Decay: A Major Contributor to Reactor Antineutrino Spectrum Shape.

Author

Zakari-Issoufou AA, Fallot M, Porta A, Algora A, Tain JL, Valencia E, Rice S, Bui VM, Cormon S, Estienne M, Agramunt J, Äystö J, Bowry M, Briz JA, Caballero-Folch R, Cano-Ott D, Cucoanes A, Elomaa VV, Eronen T, Estévez E, Farrelly GF, Garcia AR, Gelletly W, Gomez-Hornillos MB, Gorlychev V, Hakala J, Jokinen A, Jordan MD, Kankainen A, Karvonen P, Kolhinen VS, Kondev FG, Martinez T, Mendoza E, Molina F, Moore I, Perez-Cerdán AB, Podolyák Z, Penttilä H, Regan PH, Reponen M, Rissanen J, Rubio B, Shiba T, Sonzogni AA, and Weber C

Abstract

The antineutrino spectra measured in recent experiments at reactors are inconsistent with calculations based on the conversion of integral beta spectra recorded at the ILL reactor. (92)Rb makes the dominant contribution to the reactor antineutrino spectrum in the 5-8 MeV range but its decay properties are in question. We have studied (92)Rb decay with total absorption spectroscopy. Previously unobserved beta feeding was seen in the 4.5-5.5 region and the GS to GS feeding was found to be 87.5(25)%. The impact on the reactor antineutrino spectra calculated with the summation method is shown and discussed.

Published
2015
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22. New antineutrino energy spectra predictions from the summation of beta decay branches of the fission products.

Author

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

Abstract

In this Letter, we study the impact of the inclusion of the recently measured beta decay properties of the (102;104;105;106;107)Tc, (105)Mo, and (101)Nb nuclei in an updated calculation of the antineutrino energy spectra of the four fissible isotopes (235,238)U and (239,241)Pu. These actinides are the main contributors to the fission processes in pressurized water reactors. The beta feeding probabilities of the above-mentioned Tc, Mo, and Nb isotopes have been found to play a major role in the γ component of the decay heat of (239)Pu, solving a large part of the γ discrepancy in the 4-3000 s range. They have been measured by using the total absorption technique, insensitive to the pandemonium effect. The calculations are performed by using the information available nowadays in the nuclear databases, summing all the contributions of the beta decay branches of the fission products. Our results provide a new prediction of the antineutrino energy spectra of (235)U, (239,241)Pu, and, in particular, (238)U for which no measurement has been published yet. We conclude that new total absorption technique measurements are mandatory to improve the reliability of the predicted spectra.

Published
2012
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23. Indication of reactor ν(e) disappearance in the Double Chooz experiment.

Author

Abe Y, Aberle C, Akiri T, dos Anjos JC, Ardellier F, Barbosa AF, Baxter A, Bergevin M, Bernstein A, Bezerra TJ, Bezrukhov L, Blucher E, Bongrand M, Bowden NS, Buck C, Busenitz J, Cabrera A, Caden E, Camilleri L, Carr R, Cerrada M, Chang PJ, Chimenti P, Classen T, Collin AP, Conover E, Conrad JM, Cormon S, Crespo-Anadón JI, Cribier M, Crum K, Cucoanes A, D'Agostino MV, Damon E, Dawson JV, Dazeley S, Dierckxsens M, Dietrich D, Djurcic Z, Dracos M, Durand V, Efremenko Y, Elnimr M, Endo Y, Etenko A, Falk E, Fallot M, Fechner M, von Feilitzsch F, Felde J, Fernandes SM, Franco D, Franke AJ, Franke M, Furuta H, Gama R, Gil-Botella I, Giot L, Göger-Neff M, Gonzalez LF, Goodman MC, Goon JT, Greiner D, Guillon B, Haag N, Hagner C, Hara T, Hartmann FX, Hartnell J, Haruna T, Haser J, Hatzikoutelis A, Hayakawa T, Hofmann M, Horton-Smith GA, Ishitsuka M, Jochum J, Jollet C, Jones CL, Kaether F, Kalousis L, Kamyshkov Y, Kaplan DM, Kawasaki T, Keefer G, Kemp E, de Kerret H, Kibe Y, Konno T, Kryn D, Kuze M, Lachenmaier T, Lane CE, Langbrandtner C, Lasserre T, Letourneau A, Lhuillier D, Lima HP Jr, Lindner M, Liu Y, López-Castanõ JM, LoSecco JM, Lubsandorzhiev BK, Lucht S, McKee D, Maeda J, Maesano CN, Mariani C, Maricic J, Martino J, Matsubara T, Mention G, Meregaglia A, Miletic T, Milincic R, Milzstajn A, Miyata H, Motta D, Mueller TA, Nagasaka Y, Nakajima K, Novella P, Obolensky M, Oberauer L, Onillon A, Osborn A, Ostrovskiy I, Palomares C, Peeters SJ, Pepe IM, Perasso S, Perrin P, Pfahler P, Porta A, Potzel W, Queval R, Reichenbacher J, Reinhold B, Remoto A, Reyna D, Röhling M, Roth S, Rubin HA, Sakamoto Y, Santorelli R, Sato F, Schönert S, Schoppmann S, Schwan U, Schwetz T, Shaevitz MH, Shrestha D, Sida JL, Sinev V, Skorokhvatov M, Smith E, Spitz J, Stahl A, Stancu I, Strait M, Stüken A, Suekane F, Sukhotin S, Sumiyoshi T, Sun Y, Sun Z, Svoboda R, Tabata H, Tamura N, Terao K, Tonazzo A, Toups M, Trinh Thi HH, Veyssiere C, Wagner S, Watanabe H, White B, Wiebusch C, Winslow L, Worcester M, Wurm M, Yanovitch E, Yermia F, Zbiri K, and Zimmer V

Abstract

The Double Chooz experiment presents an indication of reactor electron antineutrino disappearance consistent with neutrino oscillations. An observed-to-predicted ratio of events of 0.944±0.016(stat)±0.040(syst) was obtained in 101 days of running at the Chooz nuclear power plant in France, with two 4.25 GW(th) reactors. The results were obtained from a single 10 m(3) fiducial volume detector located 1050 m from the two reactor cores. The reactor antineutrino flux prediction used the Bugey4 flux measurement after correction for differences in core composition. The deficit can be interpreted as an indication of a nonzero value of the still unmeasured neutrino mixing parameter sin(2)2θ(13). Analyzing both the rate of the prompt positrons and their energy spectrum, we find sin(2)2θ(13)=0.086±0.041(stat)±0.030(syst), or, at 90% C.L., 0.017

Published
2012
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