12 results on '"El Atmani, I."'
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2. STEREO neutrino spectrum of 235U fission rejects sterile neutrino hypothesis
- Author
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Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Chalil, A., del Amo Sanchez, P., El Atmani, I., Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Materna, T., Pessard, H., Réal, J.-S., Ricol, J.-S., Roca, C., Rogly, R., Salagnac, T., Savu, V., Schoppmann, S., Soldner, T., Stutz, A., Vialat, M., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), 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 d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), and STEREO
- Subjects
data analysis method ,Multidisciplinary ,antineutrino: spectrum ,emission: spectrum ,antineutrino/e: energy ,antineutrino/e: energy spectrum ,anomaly ,neutrino: sterile ,sensitivity ,benchmark ,weak interaction ,neutrino: cosmic radiation ,antineutrino: nuclear reactor ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,STEREO ,flavor: 3 ,neutrino: mass ,neutrino: oscillation ,neutrino: geophysics ,uranium: fission ,experimental results - Abstract
International audience; Anomalies in past neutrino measurements have led to the discovery that these particles have non-zero mass and oscillate between their three flavors when they propagate. In the 2010's, similar anomalies observed in the antineutrino spectra emitted by nuclear reactors have triggered the hypothesis of the existence of a supplementary neutrino state that would be sterile i.e. not interacting via the weak interaction. The STEREO experiment was designed to study this scientific case that would potentially extend the Standard Model of Particle Physics. Here we present a complete study based on our full set of data with significantly improved sensitivity. Installed at the ILL (Institut Laue Langevin) research reactor, STEREO has accurately measured the antineutrino energy spectrum associated to the fission of 235U. This measurement confirms the anomalies whereas, thanks to the segmentation of the STEREO detector and its very short mean distance to the core (10~m), the same data reject the hypothesis of a light sterile neutrino. Such a direct measurement of the antineutrino energy spectrum suggests instead that biases in the nuclear experimental data used for the predictions are at the origin of the anomalies. Our result supports the neutrino content of the Standard Model and establishes a new reference for the 235U antineutrino energy spectrum. We anticipate that this result will allow to progress towards finer tests of the fundamental properties of neutrinos but also to benchmark models and nuclear data of interest for reactor physics and for observations of astrophysical or geo-neutrinos.
- Published
- 2023
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3. High Energy Physics Opportunities Using Reactor Antineutrinos
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Awe, C., Barbeau, P. S., Haghighat, A., Huber, P., Li, S. C., Link, J. M., Mascolino, V., Subedi, T., Walkup, K., Aguilar-Arevalo, A., Bertou, X., Bonifazi, C., Cancelo, G., Cervantes-Vergara, B. A., Chavez, C., D Olivo, J. C., Egea, J. M., Dos Anjos, J. C., Estrada, J., Neto, A. R. F., Fernandez-Moroni, G., Foguel, A., Ford, R., Gasanego, J., Gollo, V., Izraelevitch, F., Kilminster, B., Lima, Jr H. P., Makler, M., Mendes, L. H., Molina, J., Mota, P., Nasteva, I., Paolini, E., Romero, C., Sarkis, Y., Haro, M. S., Soto, A., Stalder, D., Tiffenberg, J., Torres, C., Lindner, M., An, F. P., Balantekin, A. B., Band, H. R., Bishai, M., Blyth, S., Cao, G. F., Cao, J., Chang, J. F., Chang, Y., Chen, H. S., Chen, S. M., Chen, Y., Chen, Y. X., Cheng, J., Cheng, Z. K., Cherwinka, J. J., Chu, M. C., Cummings, J. P., Dalager, O., Deng, F. S., Ding, Y. Y., Diwan, M. V., Dohnal, T., Dove, J., Dvořák, M., Dwyer, D. A., Gallo, J. P., Gonchar, M., Gong, G. H., Gong, H., Gu, W. Q., Guo, J. Y., Guo, L., Guo, X. H., Guo, Y. H., Guo, Z., Hackenburg, R. W., Hans, S., He, M., Heeger, K. M., Heng, Y. K., Higuera, A., Hor, Y. K., Hsiung, Y. B., Hu, B. Z., Hu, J. R., Hu, T., Hu, Z. J., Huang, H. X., Huang, X. T., Jaffe, D. E., Jen, K. L., Ji, X. L., Ji, X. P., Johnson, R. A., Jones, D., Kang, L., Kettell, S. H., Kohn, S., Kramer, M., Langford, T. J., Lee, J., Lee, J. H. C., Lei, R. T., Leitner, R., Leung, J. K. C., Li, F., Li, H. L., Li, J. J., Li, Q. J., Li, S., Li, W. D., Li, X. N., Li, X. Q., Li, Y. F., Li, Z. B., Liang, H., Lin, C. J., Lin, G. L., Lin, S., Ling, J. J., Littenberg, L., Littlejohn, B. R., Liu, J. C., Liu, J. L., Lu, C., Lu, H. Q., Lu, J. S., Luk, K. B., Ma, X. B., Ma, X. Y., Ma, Y. Q., Mandujano, R. C., Marshall, C., Martinez Caicedo, D. A., Mcdonald, K. T., Mckeown, R. D., Meng, Y., Napolitano, J., Naumov, D., Naumova, E., Ochoa-Ricoux, J. P., Olshevskiy, A., Pan, H. -R, Park, J., Patton, S., Peng, J. C., Pun, C. S. J., Qi, F. 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K., Rajput, M., Ranucci, G., Re, A., Rebber, H., Rebii, A., Ren, B., Rezinko, T., Ricci, B., Robens, M., Roche, M., Rodphai, N., Romani, A., Roth, C., Ruan, X., Rujirawat, S., Rybnikov, A., Sadovsky, A., Saggese, P., Salamanna, G., Sanfilippo, S., Sangka, A., Sanguansak, N., Sawangwit, U., Sawatzki, J., Sawy, F., Schever, M., Schuler, J., Schwab, C., Schweizer, K., Selivanov, D., Selyunin, A., Serafini, A., Settanta, G., Settimo, M., Shao, Z., Sharov, V., Shi, J., Shutov, V., Sidorenkov, A., Simkovic, F., Sirignano, C., Siripak, J., Sisti, M., Slupecki, M., Smirnov, M., Smirnov, O., Sogo-Bezerra, T., Songwadhana, J., Soonthornthum, B., Sotnikov, A., Sramek, O., Sreethawong, W., Stahl, A., Stanco, L., Stankevich, K., Stefanik, D., Steiger, H., Steinmann, J., Sterr, T., Stock, M. R., Strati, V., Studenikin, A., Sun, G. X., Sun, S. F., Sun, X. L., Sun, Y. J., Sun, Y. 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A., Tabrizi, Z., Vivier, M., 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), Institut Pluridisciplinaire Hubert Curien (IPHC), 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), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Neutrino de Champagne Ardenne (LNCA - UMS 3263), 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 National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique subatomique et des technologies associées (SUBATECH), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST), Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Cryogénie (NEEL - Cryo), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Hélium : du fondamental aux applications (NEEL - HELFA), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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, CHANDLER, CONNIE, CONUS, Daya Bay, JUNO, MTAS, NEOS, NuLat, PROSPECT, RENO, Ricochet, ROADSTR Near-Field Working Group, SoLid, Stereo, Valencia-Nantes TAGS, vIOLETA, WATCHMAN, and HEP, INSPIRE
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High Energy Physics - Experiment (hep-ex) ,[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex] ,hep-ex ,neutrino: energy spectrum ,antineutrino: nuclear reactor ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,FOS: Physical sciences ,neutrino: oscillation ,neutrino: nuclear reactor ,Particle Physics - Experiment ,neutrino: flux ,High Energy Physics - Experiment - Abstract
Nuclear reactors are uniquely powerful, abundant, and flavor-pure sources of antineutrinos that continue to play a vital role in the US neutrino physics program. The US reactor antineutrino physics community is a diverse interest group encompassing many detection technologies and many particle physics topics, including Standard Model and short-baseline oscillations, BSM physics searches, and reactor flux and spectrum modeling. The community's aims offer strong complimentary with numerous aspects of the wider US neutrino program and have direct relevance to most of the topical sub-groups composing the Snowmass 2021 Neutrino Frontier. Reactor neutrino experiments also have a direct societal impact and have become a strong workforce and technology development pipeline for DOE National Laboratories and universities. This white paper, prepared as a submission to the Snowmass 2021 community organizing exercise, will survey the state of the reactor antineutrino physics field and summarize the ways in which current and future reactor antineutrino experiments can play a critical role in advancing the field of particle physics in the next decade., Contribution to Snowmass 2021
- Published
- 2022
4. Searching for Hidden Neutrons with a Reactor Neutrino Experiment: Constraints from the STEREO Experiment
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Almazán, H., primary, Bernard, L., additional, Blanchet, A., additional, Bonhomme, A., additional, Buck, C., additional, del Amo Sanchez, P., additional, El Atmani, I., additional, Labit, L., additional, Lamblin, J., additional, Letourneau, A., additional, Lhuillier, D., additional, Licciardi, M., additional, Lindner, M., additional, Materna, T., additional, Méplan, O., additional, Pessard, H., additional, Pignol, G., additional, Réal, J.-S., additional, Ricol, J.-S., additional, Roca, C., additional, Rogly, R., additional, Salagnac, T., additional, Sarrazin, M., additional, Savu, V., additional, Schoppmann, S., additional, Soldner, T., additional, Stutz, A., additional, and Vialat, M., additional
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- 2022
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5. STEREO neutrino spectrum of 235U fission rejects sterile neutrino hypothesis.
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Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Chalil, A., del Amo Sanchez, P., El Atmani, I., Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Materna, T., Pessard, H., Réal, J.-S., Ricol, J.-S., Roca, C., and Rogly, R.
- Abstract
Anomalies in past neutrino measurements have led to the discovery that these particles have non-zero mass and oscillate between their three flavours when they propagate. In the 2010s, similar anomalies observed in the antineutrino spectra emitted by nuclear reactors have triggered the hypothesis of the existence of a supplementary neutrino state that would be sterile, that is, not interacting by means of the weak interaction1. The STEREO experiment2–6 was designed to investigate this conjecture, which would potentially extend the standard model of particle physics. Here we present an analysis of the full set of data generated by STEREO, confirming observed anomalies while rejecting the hypothesis of a light sterile neutrino. Installed at the Institut Laue–Langevin (ILL) research reactor, STEREO accurately measures the antineutrino energy spectrum associated to the fission of
235 U. The segmentation of the detector and its very short distance to the compact core are crucial properties of STEREO for our analysis. The measured antineutrino energy spectrum suggests that anomalies originate from biases in the nuclear experimental data used for the predictions7,8. Our result supports the neutrino content of the standard model and establishes a new reference for the235 U antineutrino energy spectrum. We anticipate that this result will allow progress towards finer tests of the fundamental properties of neutrinos but also to benchmark models and nuclear data of interest for reactor physics9,10 and for observations of astrophysical or geoneutrinos11,12.Accurate measurements of the antineutrino energy spectrum of235 U fission by the STEREO detector reject the sterile neutrino hypothesis and point to biases in the nuclear data to explain the discrepancies with the prediction. [ABSTRACT FROM AUTHOR]- Published
- 2023
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6. Improved sterile neutrino constraints from the STEREO experiment with 179 days of reactor-on data IMPROVED STERILE NEUTRINO CONSTRAINTS from the ... ALMAZÁN H. et al
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Almazan H., Bernard L., Blanchet A., Bonhomme A., Buck C., Del Amo Sanchez P., El Atmani I., Haser J., Kandzia F., Kox S., Labit L., Lamblin J., Letourneau A., Lhuillier D., Licciardi M., Lindner M., Materna T., Minotti A., Pessard H., Real J. -S., Roca C., Rogly R., Salagnac T., Savu V., Schoppmann S., Sergeyeva V., Soldner T., Stutz A., Vialat M., Almazan, H, Bernard, L, Blanchet, A, Bonhomme, A, Buck, C, Del Amo Sanchez, P, El Atmani, I, Haser, J, Kandzia, F, Kox, S, Labit, L, Lamblin, J, Letourneau, A, Lhuillier, D, Licciardi, M, Lindner, M, Materna, T, Minotti, A, Pessard, H, Real, J, Roca, C, Rogly, R, Salagnac, T, Savu, V, Schoppmann, S, Sergeyeva, V, Soldner, T, Stutz, A, and Vialat, M
- Subjects
sterile neutrinos, neutrino oscillation, reactor - Abstract
The STEREO experiment is a very short baseline reactor antineutrino experiment. It is designed to test the hypothesis of light sterile neutrinos being the cause of a deficit of the observed antineutrino interaction rate at short baselines with respect to the predicted rate, known as the reactor antineutrino anomaly. The STEREO experiment measures the antineutrino energy spectrum in six identical detector cells covering baselines between 9 and 11 m from the compact core of the ILL research reactor. In this article, results from 179 days of reactor turned on and 235 days of reactor turned off are reported at a high degree of detail. The current results include improvements in the modelling of detector optical properties and the γ-cascade after neutron captures by gadolinium, the treatment of backgrounds, and the statistical method of the oscillation analysis. Using a direct comparison between antineutrino spectra of all cells, largely independent of any flux prediction, we find the data compatible with the null oscillation hypothesis. The best-fit point of the reactor antineutrino anomaly is rejected at more than 99.9% C.L.
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- 2020
7. Note on arXiv:2005.05301, 'Preparation of the Neutrino-4 experiment on search for sterile neutrino and the obtained results of measurements'
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Andriamirado, M., Balantekin, A. B., Band, H. R., Bass, C. D., Bergeron, D. E., Berish, D., Bowden, N. S., Brodsky, J. P., Bryan, C. D., Classen, T., Conant, A. J., Deichert, G., Diwan, M. V., Dolinski, M. J., Erickson, A., Foust, B. T., Gaison, J. K., Galindo-Uribarri, A., Gilbert, C. E., Hackett, B. T., Hans, S., Hansell, A. B., Heeger, K. M., Jaffe, D. E., Ji, X., Jones, D. C., Kyzylova, O., Lane, C. E., Langford, T. J., Larosa, J., Littlejohn, B. R., Lu, X., Maricic, J., Mendenhall, M. P., Meyer, A. M., Milincic, R., Mitchell, I., Mueller, P. E., Mumm, H. P., Napolitano, J., Nave, C., Neilson, R., Nikkel, J. A., Norcini, D., Nour, S., Palomino-Gallo, J. L., Pushin, D. A., Qian, X., Romero-Romero, E., Rosero, R., Surukuchi, P. T., Tyra, M. A., Varner, R. L., Venegas-Vargas, D., Weatherly, P. B., White, C., Wilhelmi, J., Woolverton, A., Yeh, M., Zhang, A., Zhang, C., Zhang, X., Almazan, H., Bonhomme, A., Buck, C., Del Amo Sanchez, P., El Atmani, I., Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Materna, T., Pessard, H., Jean-Sébastien Real, Roca, C., Rogly, R., Savu, V., Schoppmann, S., Soldner, T., Stutz, A., and Vialat, M.
- Abstract
We comment on the claimed observation [arXiv:arXiv:2005.05301] of sterileneutrino oscillations by the Neutrino-4 collaboration. Such a claim, whichrequires the existence of a new fundamental particle, demands a level of rigorcommensurate with its impact. The burden lies with the Neutrino-4 collaborationto provide the information necessary to prove the validity of their claim tothe community. In this note, we describe aspects of both the data and analysismethod that might lead to an oscillation signature arising from a nullexperiment and describe additional information needed from the Neutrino-4collaboration to support the oscillation claim. Additionally, as opposed to theassertion made by the Neutrino-4 collaboration, we also show that the method of'coherent summation' using the $L/E$ parameter produces similar results to themethods used by the PROSPECT and the STEREO collaborations.
- Published
- 2021
8. First antineutrino energy spectrum from 235U fissions with the STEREO detector at ILL *
- Author
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Almazán, H, primary, Bernard, L, additional, Blanchet, A, additional, Bonhomme, A, additional, Buck, C, additional, del Amo Sanchez, P, additional, El Atmani, I, additional, Labit, L, additional, Lamblin, J, additional, Letourneau, A, additional, Lhuillier, D, additional, Licciardi, M, additional, Lindner, M, additional, Materna, T, additional, Pessard, H, additional, Réal, J-S, additional, Ricol, J-S, additional, Roca, C, additional, Rogly, R, additional, Salagnac, T, additional, Savu, V, additional, Schoppmann, S, additional, Sergeyeva, V, additional, Soldner, T, additional, Stutz, A, additional, and Vialat, M, additional
- Published
- 2021
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9. First antineutrino energy spectrum from 235U fissions with the STEREO detector at ILL.
- Author
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Almazán, H, Bernard, L, Blanchet, A, Bonhomme, A, Buck, C, del Amo Sanchez, P, El Atmani, I, Labit, L, Lamblin, J, Letourneau, A, Lhuillier, D, Licciardi, M, Lindner, M, Materna, T, Pessard, H, Réal, J-S, Ricol, J-S, Roca, C, Rogly, R, and Salagnac, T
- Subjects
NUCLEAR reactor cores ,DETECTORS ,ANTINEUTRINOS ,BETA decay - Abstract
This article reports the measurement of the
235 U-induced antineutrino spectrum shape by the Stereo experiment. 43 000 antineutrinos have been detected at about 10 m from the highly enriched core of the ILL reactor during 118 full days equivalent at nominal power. The measured inverse beta decay spectrum is unfolded to provide a pure235 U spectrum in antineutrino energy. A careful study of the unfolding procedure, including a cross-validation by an independent framework, has shown that no major biases are introduced by the method. A significant local distortion is found with respect to predictions around Eν ≃ 5.3 MeV. A Gaussian fit of this local excess leads to an amplitude of A = 12.1 ± 3.4% (3.5σ). [ABSTRACT FROM AUTHOR]- Published
- 2021
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10. Note on arXiv:2005.05301, 'Preparation of the Neutrino-4 experiment on search for sterile neutrino and the obtained results of measurements'
- Author
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Andriamirado, M., Balantekin, A. B., Band, H. R., Bass, C. D., Bergeron, D. E., Berish, D., Bowden, N. S., Brodsky, J. P., Bryan, C. D., Classen, T., Conant, A. J., Deichert, G., Diwan, M. V., Dolinski, M. J., Erickson, A., Foust, B. T., Gaison, J. K., Galindo-Uribarri, A., Gilbert, C. E., Hackett, B. T., Hans, S., Hansell, A. B., Heeger, K. M., Jaffe, D. E., Ji, X., Jones, D. C., Kyzylova, O., Lane, C. E., Langford, T. J., Larosa, J., Littlejohn, B. R., Lu, X., Maricic, J., Mendenhall, M. P., Meyer, A. M., Milincic, R., Mitchell, I., Mueller, P. E., Mumm, H. P., Napolitano, J., Nave, C., Neilson, R., Nikkel, J. A., Norcini, D., Nour, S., Palomino-Gallo, J. L., Pushin, D. A., Qian, X., Romero-Romero, E., Rosero, R., Surukuchi, P. T., Tyra, M. A., Varner, R. L., Venegas-Vargas, D., Weatherly, P. B., White, C., Wilhelmi, J., Woolverton, A., Yeh, M., Zhang, A., Zhang, C., Zhang, X., Almazan, H., Bonhomme, A., Buck, C., Del Amo Sanchez, P., El Atmani, I., Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Matthieu Licciardi, Materna, T., Pessard, H., Real, J. -S, Roca, C., Rogly, R., Savu, V., Schoppmann, S., Soldner, T., Stutz, A., Vialat, M., 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 d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), ILL, PROSPECT, and STEREO
- Subjects
neutrino: sterile: search for ,data analysis method ,FOS: Physical sciences ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,High Energy Physics - Experiment ,coherence ,High Energy Physics - Experiment (hep-ex) ,statistical analysis ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,neutrino: oscillation ,Nuclear Experiment (nucl-ex) ,numerical calculations: Monte Carlo ,Nuclear Experiment ,signature - Abstract
We comment on the claimed observation [arXiv:arXiv:2005.05301] of sterile neutrino oscillations by the Neutrino-4 collaboration. Such a claim, which requires the existence of a new fundamental particle, demands a level of rigor commensurate with its impact. The burden lies with the Neutrino-4 collaboration to provide the information necessary to prove the validity of their claim to the community. In this note, we describe aspects of both the data and analysis method that might lead to an oscillation signature arising from a null experiment and describe additional information needed from the Neutrino-4 collaboration to support the oscillation claim. Additionally, as opposed to the assertion made by the Neutrino-4 collaboration, we also show that the method of 'coherent summation' using the $L/E$ parameter produces similar results to the methods used by the PROSPECT and the STEREO collaborations., Comment: 5 pages, 3 figures
11. Improved STEREO simulation with a new gamma ray spectrum of excited gadolinium isotopes using FIFRELIN
- Author
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Manfred Lindner, J. Haser, M. Vialat, D. Lhuillier, C. Roca, H. Almazan, Adrien Blanchet, I. El Atmani, Torsten Soldner, T. Materna, Christian Buck, J. S. Real, F. Kandzia, A. Chebboubi, A. Stutz, P. del Amo Sanchez, L. Thulliez, L. Labit, Stefan Schoppmann, A. Letourneau, S. Kox, V. Savu, Olivier Litaize, A. Bonhomme, J. Lamblin, A. Minotti, T. Salagnac, V. Sergeyeva, H. Pessard, L. Bernard, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Almazan, H, Bernard, L, Blanchet, A, Bonhomme, A, Buck, C, Chebboubi, A, del Amo Sanchez, P, El Atmani, I, Haser, J, Kandzia, F, Kox, S, Labit, L, Lamblin, J, Letourneau, A, Lhuillier, D, Lindner, M, Litaize, O, Materna, T, Minotti, A, Pessard, H, Real, J, Roca, C, Salagnac, T, Savu, V, Schoppmann, S, Sergeyeva, V, Soldner, T, Stutz, A, Thulliez, L, Vialat, M, and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])
- Subjects
Nuclear and High Energy Physics ,Physics - Instrumentation and Detectors ,Gadolinium ,Astrophysics::High Energy Astrophysical Phenomena ,Nuclear Theory ,scintillation counter: liquid ,FOS: Physical sciences ,chemistry.chemical_element ,antineutrino/e: energy spectrum ,Scintillator ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,n: thermal ,01 natural sciences ,7. Clean energy ,programming ,High Energy Physics - Experiment ,Nuclear physics ,High Energy Physics - Experiment (hep-ex) ,Positron ,data compilation ,gadolinium: admixture ,0103 physical sciences ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,Neutron ,[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,Nuclear Experiment (nucl-ex) ,n: capture ,010306 general physics ,Nuclear Experiment ,numerical calculations ,Physics ,010308 nuclear & particles physics ,Gamma ray ,Instrumentation and Detectors (physics.ins-det) ,simulation ,3. Good health ,Neutron capture ,gamma ray: emission ,chemistry ,sterile neutrino ,Inverse beta decay ,nuclear reactor ,Delayed neutron ,gadolinium: nuclide ,neutron capture - Abstract
The STEREO experiment measures the electron antineutrino spectrum emitted in a research reactor using the inverse beta decay reaction on H nuclei in a gadolinium loaded liquid scintillator. The detection is based on a signal coincidence of a prompt positron and a delayed neutron capture event. The simulated response of the neutron capture on gadolinium is crucial for the comparison with data, in particular in the case of the detection efficiency. Among all stable isotopes, $^{155}$Gd and $^{157}$Gd have the highest cross sections for thermal neutron capture. The excited nuclei after the neutron capture emit gamma rays with a total energy of about 8 MeV. The complex level schemes of $^{156}$Gd and $^{158}$Gd are a challenge for the modeling and prediction of the deexcitation spectrum, especially for compact detectors where gamma rays can escape the active volume. With a new description of the Gd(n,${\gamma}$) cascades obtained using the FIFRELIN code, the agreement between simulation and measurements with a neutron calibration source was significantly improved in the STEREO experiment. A database of ten millions of deexcitation cascades for each isotope has been generated and is now available for the user., Comment: 5 pages, 3 figures
- Published
- 2019
- Full Text
- View/download PDF
12. Joint Measurement of the ^{235}U Antineutrino Spectrum by PROSPECT and STEREO.
- Author
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Almazán H, Andriamirado M, Balantekin AB, Band HR, Bass CD, Bergeron DE, Bernard L, Blanchet A, Bonhomme A, Bowden NS, Bryan CD, Buck C, Classen T, Conant AJ, Deichert G, Del Amo Sanchez P, Delgado A, Diwan MV, Dolinski MJ, El Atmani I, Erickson A, Foust BT, Gaison JK, Galindo-Uribarri A, Gilbert CE, Hans S, Hansell AB, Heeger KM, Heffron B, Jaffe DE, Jayakumar S, Ji X, Jones DC, Koblanski J, Kyzylova O, Labit L, Lamblin J, Lane CE, Langford TJ, LaRosa J, Letourneau A, Lhuillier D, Licciardi M, Lindner M, Littlejohn BR, Lu X, Maricic J, Materna T, Mendenhall MP, Meyer AM, Milincic R, Mueller PE, Mumm HP, Napolitano J, Neilson R, Nikkel JA, Nour S, Palomino JL, Pessard H, Pushin DA, Qian X, Réal JS, Ricol JS, Roca C, Rogly R, Rosero R, Salagnac T, Savu V, Schoppmann S, Searles M, Sergeyeva V, Soldner T, Stutz A, Surukuchi PT, Tyra MA, Varner RL, Venegas-Vargas D, Vialat M, Weatherly PB, White C, Wilhelmi J, Woolverton A, Yeh M, Zhang C, and Zhang X
- Abstract
The PROSPECT and STEREO collaborations present a combined measurement of the pure ^{235}U antineutrino spectrum, without site specific corrections or detector-dependent effects. The spectral measurements of the two highest precision experiments at research reactors are found to be compatible with χ^{2}/ndf=24.1/21, allowing a joint unfolding of the prompt energy measurements into antineutrino energy. This ν[over ¯]_{e} energy spectrum is provided to the community, and an excess of events relative to the Huber model is found in the 5-6 MeV region. When a Gaussian bump is fitted to the excess, the data-model χ^{2} value is improved, corresponding to a 2.4σ significance.
- Published
- 2022
- Full Text
- View/download PDF
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