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1. Results from a Prototype TES Detector for the Ricochet Experiment

Author: Ricochet Collaboration, Augier, C., Baulieu, G., Belov, V., Bergé, L., Billard, J., Bres, G., Bret, J-. L., Broniatowski, A., Calvo, M., Cazes, A., Chaize, D., Chala, M., Chang, C. L., Chapellier, M., Chaplinsky, L., Chemin, G., Chen, R., Colas, J., Cudmore, E., De Jesus, M., de Marcillac, P., Dumoulin, L., Exshaw, O., Ferriol, S., Figueroa-Feliciano, E., Filippini, J. -B., Formaggio, J. A., Fuard, S., Gannon, K., Gascon, J., Giuliani, A., Goupy, J., Goy, C., Guerin, C., Guy, E., Harrington, P., Hertel, S. A., Heusch, M., Hong, Z., Ianigro, J. -C., Jin, Y., Juillard, A., Karaivanov, D., Kazarcev, S., Lamblin, J., Lattaud, H., Li, M., Lisovenko, M., Lubashevskiy, A., Marnieros, S., Martini, N., Mayer, D. W., Minet, J., Monfardini, A., Mounier, F., Novati, V., Olivieri, E., Oriol, C., Mateo, L. Ovalle, Palladino, K. J., Patel, P. K., Perbet, E., Pinckney, H. D., Poda, D. V., Ponomarev, D., Rarbi, F., Real, J. -S., Redon, T., Reyes, F. C., Ricol, J. -S., Robert, A., Rozov, S., Rozova, I., Salagnac, T., Schmidt, B., Scorza, S., Shevchik, Ye., Soldner, T., Stachurska, J., Stutz, A., Vagneron, L., Van De Pontseele, W., Veihmeyer, C., Vezzu, F., Wang, G., Winslow, L., Yakushev, E., Yefremenko, V. G., Zhang, J., and Zinatulina, D.
Subjects: Physics - Instrumentation and Detectors
Abstract: Coherent elastic neutrino-nucleus scattering (CE$\nu$NS) offers valuable sensitivity to physics beyond the Standard Model. The Ricochet experiment will use cryogenic solid-state detectors to perform a precision measurement of the CE$\nu$NS spectrum induced by the high neutrino flux from the Institut Laue-Langevin nuclear reactor. The experiment will employ an array of detectors, each with a mass of $\sim$30 g and a targeted energy threshold of 50 eV. Nine of these detectors (the "Q-Array") will be based on a novel Transition-Edge Sensor (TES) readout style, in which the TES devices are thermally coupled to the absorber using a gold wire bond. We present initial characterization of a Q-Array-style detector using a 1 gram silicon absorber, obtaining a baseline root-mean-square resolution of less than 40 eV., Comment: 18 pages, 8 figures
Published: 2023
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2. Stereo neutrino spectrum of 235U fission rejects sterile neutrino hypothesis

Author: Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Chalil, A., Sanchez, P. del Amo, Atmani, I. El, Labit, L., Lhuillier, J. Lamblin A. Letourneau 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., and Vialat, M.
Subjects: High Energy Physics - Experiment
Abstract: 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., Comment: 34 pages, 13 figures. Final version submitted to Nature
Published: 2022
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3. Fast neutron background characterization of the future Ricochet experiment at the ILL research nuclear reactor

Author: Augier, C., Baulieu, G., Belov, V., Berge, L., Billard, J., Bres, G., Bret, J. -L., Broniatowski, A., Calvo, M., Cazes, A., Chaize, D., Chapellier, M., Chaplinsky, L., Chemin, G., Chen, R., Colas, J., De Jesus, M., de Marcillac, P., Dumoulin, L., Exshaw, O., Ferriol, S., Figueroa-Feliciano, E., Filippini, J. -B., Formaggio, J. A., Fuard, S., Gascon, J., Giuliani, A., Goupy, J., Goy, C., Guerin, C., Guy, E., Harrington, P., Heine, S. T., Hertel, S. A., Heusch, M., Hirjibehedin, C. F., Hong, Z., Ianigro, J. -C., Jin, Y., Johnston, J. P., Juillard, A., Karaivanov, D., Kazarcev, S., Lamblin, J., Lattaud, H., Li, M., Lubashevskiy, A., Marnieros, S., Mayer, D. W., Minet, J., Misiak, D., Mocellin, J. -L., Monfardini, A., Mounier, F., Oliver, W. D., Olivieri, E., Oriol, C., Patel, P. K., Perbet, E., Pinckney, H. D., Poda, D., Ponomarev, D., Rarbi, F., Real, J. -S., Redon, T., Robert, A., Rozov, S., Rozova, I., Salagnac, T., Sanglard, V., Schmidt, B., Shevchik, Ye., Sibille, V., Soldner, T., Stachurska, J., Stutz, A., Vagneron, L., Van De Pontseele, W., Vezzu, F., Weber, S., Winslow, L., Yakushev, E., and Zinatulina, D.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: The future Ricochet experiment aims at searching for new physics in the electroweak sector by providing a high precision measurement of the Coherent Elastic Neutrino-Nucleus Scattering (CENNS) process down to the sub-100 eV nuclear recoil energy range. The experiment will deploy a kg-scale low-energy-threshold detector array combining Ge and Zn target crystals 8.8 meters away from the 58 MW research nuclear reactor core of the Institut Laue Langevin (ILL) in Grenoble, France. Currently, the Ricochet collaboration is characterizing the backgrounds at its future experimental site in order to optimize the experiment's shielding design. The most threatening background component, which cannot be actively rejected by particle identification, consists of keV-scale neutron-induced nuclear recoils. These initial fast neutrons are generated by the reactor core and surrounding experiments (reactogenics), and by the cosmic rays producing primary neutrons and muon-induced neutrons in the surrounding materials. In this paper, we present the Ricochet neutron background characterization using $^3$He proportional counters which exhibit a high sensitivity to thermal, epithermal and fast neutrons. We compare these measurements to the Ricochet Geant4 simulations to validate our reactogenic and cosmogenic neutron background estimations. Eventually, we present our estimated neutron background for the future Ricochet experiment and the resulting CENNS detection significance., Comment: 14 pages, 14 figures, 1 table
Published: 2022
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4. Improved FIFRELIN de-excitation model for neutrino applications

Author: Almazan, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Chalil, A., Chebboubi, A., Sanchez, P. del Amo, Atmani, I. El, Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Litaize, O., Materna, T., Pessard, H., Real, J. -S., Ricol, J. -S., Roca, C., Rogly, R., Salagnac, T., Savu, V., Schoppmann, S., Soldner, T., Stutz, A., Thulliez, L., and Vialat, M.
Subjects: High Energy Physics - Experiment, Nuclear Experiment
Abstract: The precise modeling of the de-excitation of Gd isotopes is of great interest for experimental studies of neutrinos using Gd-loaded organic liquid scintillators. The FIFRELIN code was recently used within the purposes of the STEREO experiment for the modeling of the Gd de-excitation after neutron capture in order to achieve a good control of the detection efficiency. In this work, we report on the recent additions in the FIFRELIN de-excitation model with the purpose of enhancing further the de-excitation description. Experimental transition intensities from EGAF database are now included in the FIFRELIN cascades, in order to improve the description of the higher energy part of the spectrum. Furthermore, the angular correlations between {\gamma} rays are now implemented in FIFRELIN, to account for the relative anisotropies between them. In addition, conversion electrons are now treated more precisely in the whole spectrum range, while the subsequent emission of X rays is also accounted for. The impact of the aforementioned improvements in FIFRELIN is tested by simulating neutron captures in various positions inside the STEREO detector. A repository of up-to-date FIFRELIN simulations of the Gd isotopes is made available for the community, with the possibility of expanding for other isotopes which can be suitable for different applications., Comment: Corrected typos on author names on arXiv metadata
Published: 2022
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5. Coherent elastic neutrino-nucleus scattering: Terrestrial and astrophysical applications

Author: Abdullah, M., Abele, H., Akimov, D., Angloher, G., Aristizabal-Sierra, D., Augier, C., Balantekin, A. B., Balogh, L., Barbeau, P. S., Baudis, L., Baxter, A. L., Beaufort, C., Beaulieu, G., Belov, V., Bento, A., Berge, L., Bernardi, I. A., Billard, J., Bolozdynya, A., Bonhomme, A., Bres, G., Bret, J-. L., Broniatowski, A., Brossard, A., Buck, C., Cadeddu, M., Calvo, M., Canonica, L., Cappella, F., Cardani, L., Casali, N., Cazes, A., Cerulli, R., Chaize, D., Chang, C., Chapellier, M., Chaplinsky, L., Chemin, G., Chen, R., Colantoni, I., Colas, J., Coloma, P., Corcoran, E. C., Crawford, S., Cruciani, A., Fard, A. Dastgheibi, De Jesus, M., de Marcillac, P., De Romeri, V., del Castello, G., del GalloRoccagiovine, M., Delicato, D., Demarteau, M., Deng, Y., Dent, J. B., Denton, P. B., Dering, K., Doblhammer, A., Dordei, F., Dorer, S., Dumoulin, L., Dunford, D., Dutta, B., Erhart, A., Exshaw, O., Ferriol, S., Figueroa-Feliciano, E., Filippini, J. B., Flores, L . J., Formaggio, J. A., Friedl, M., Fuard, S., Gao, F., Garai, A., Garces, E. A., Gascon, J., Gehrlein, J., Gerbier, G., Ghete, V. M., Giomataris, I., Giroux, G., Giuliani, A., Giunti, C., Gorel, P., Goupy, C., Goupy, J., Goy, C., Green, M. P., Gros, M., Guerin, C., Guidi, V., Guillaudin, O., Guy, E., Ha, C., Hauff, D., Hakenmuller, J., Harrington, P. M., Hedges, S., Heine, S. T., Hertel, S., Heusch, M., Hoarau, C., Hoferichter, M., Hoppe, E. W., Hong, Z., Horiuchi, S., Huber, P., Ianigro, J. C., Jachowicz, N., Jericha, E., Jin, Y., Johnston, J. P., Juillard, A., Katsioulas, I., Kazarcev, S., Kaznacheeva, M., Kelly, F., Kelly, K. J., Kim, D., Kinast, A., Klinkenberg, L., Kluck, H., Knights, P., Ko, Y. J., Kosmas, T. S., Kwon, L., Lamblin, J., Lang, R. F., Langenkamper, A., Langrock, S., Lasserre, T., Lattaud, H., Lautridou, P., Lee, H. S., Lenardo, B. G., Lhuillier, D., Li, M., Li, S. C., Li, Y. F., Li, Z., Lindner, M., Liu, J., Loomba, D., Lubashevskiy, A., Machado, P. A. N., Mancuso, M., Maneschg, W., Markoff, D. M., Marnieros, S., Martin, R., Martin, R. D., Mauri, B., Mayer, D. W., Mazzolari, A., Mazzucato, E., Menendez, J., Minet, J., Miranda, O. G., Misiak, D., Mols, J. -P., Monfardini, A., Mounier, F., Muraz, J. F., Neep, T., Neilson, R., Newby, J., Newstead, J. L., Neyrial, H., Ni, K., Nikolopoulos, K., Nones, C., Norcini, D., Pandey, V., O'Brien, P., O'Hare, C. A. J., Oberauer, L., Oliver, W., Olivieri, E., Onillon, A., Oriol, C., Ortmann, T., Owen, R., Palladino, K. J., Papoulias, D. K., Park, J. C., Parno, D. S., Patel, P. K., Pattavina, L., Peinado, E., Perbet, E., Peters, L., Petricca, F., Pinckney, H. D., Piro, M. -C., Ponomarev, D., Poda, D., Potzel, W., Probst, F., Pucci, F., Rarbi, F., Rapp, R., Ray, H., Real, J. -S., Reindl, F., Rich, G. C., Ricol, J. S., Rink, T., Redon, T., Rogly, R., Robert, A., Rothe, J., Rozov, S., Rozova, I., Salagnac, T., Garcia, E. Sanchez, Garcia, G. Sanchez, Sanders, O., Sanglard, V., Santos, D., Sarkis, Y., Savu, V., Savvidis, G., Savvidis, I., Schermer, N., Schieck, J., Schmidt, B., Schonert, S., Scholberg, K., Schwenk, A., Schwertner, C., Scola, L., Shevchik, Ye., Shin, S., Sibille, V., Shoemaker, I. M., Snowden-Ifft, D. P., Soldner, T., Soum, G., Spooner, N. J. C., Stachurska, J., Stodolsky, L., Strauss, R., Strigari, L. E., Stutz, A., Suh, B. D., Suhonen, J., Tabrizi, Z., Takhistov, V., Thompson, A., Tomei, C., Tortola, M., Tripathi, M., Vagneron, L., Valle, J. W. F., Mirbach, K. v., Van De Ponteseele, W., Vignati, M., Vivier, M., Fernandez, F. Vazquez de Sola, Vezzu, F., Vidal, M., Wagner, V., Walker, J. W., Ward, R., Wex, A., Winslow, L., Wong, H. T., Wood, M. H., Xu, J., Yang, L., Yakushev, E., Zampaolo, M., Zettlemoyer, J., Zhang, Y. Y., and Zinatulina, D.
Subjects: High Energy Physics - Phenomenology, Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract: Coherent elastic neutrino-nucleus scattering (CE$\nu$NS) is a process in which neutrinos scatter on a nucleus which acts as a single particle. Though the total cross section is large by neutrino standards, CE$\nu$NS has long proven difficult to detect, since the deposited energy into the nucleus is $\sim$ keV. In 2017, the COHERENT collaboration announced the detection of CE$\nu$NS using a stopped-pion source with CsI detectors, followed up the detection of CE$\nu$NS using an Ar target. The detection of CE$\nu$NS has spawned a flurry of activities in high-energy physics, inspiring new constraints on beyond the Standard Model (BSM) physics, and new experimental methods. The CE$\nu$NS process has important implications for not only high-energy physics, but also astrophysics, nuclear physics, and beyond. This whitepaper discusses the scientific importance of CE$\nu$NS, highlighting how present experiments such as COHERENT are informing theory, and also how future experiments will provide a wealth of information across the aforementioned fields of physics., Comment: contribution to Snowmasss 2021. Contact authors: P. S. Barbeau, R. Strauss, L. E. Strigari
Published: 2022

6. Search for sub-GeV Dark Matter via Migdal effect with an EDELWEISS germanium detector with NbSi TES sensors

Author: Armengaud, E., Arnaud, Q., Augier, C., Benoît, A., Bergé, L., Billard, J., Broniatowski, A., Camus, P., Caze, A., Chapellier, M., Charlieux, F., De Jésus, M., Dumoulin, L., Eitel, K., Filippini, J. B., Filosofov, D., Gascon, J., Giuliani, A., Gros, M., Guy, E., Jin, Y., Juillard, A., Kleifges, M., Lattaud, H., Marnieros, S., Misiak, D., Navick, X. F., Nones, C., Olivieri, E., Oriol, C., Pari, P., Paul, B., Poda, D., Rozov, S., Salagnac, T., Sanglard, V., Vagneron, L., Yakushev, E., Zolotarova, A., and Kavanagh, B. J.
Subjects: Astrophysics - Astrophysics of Galaxies
Abstract: The EDELWEISS collaboration reports on the search for Dark Matter (DM) particle interactions via Migdal effect with masses between $32$ MeV$\cdot$c$^{-2}$ to $2$ GeV$\cdot$c$^{-2}$ using a $200$ g cryogenic Ge detector sensitive to simultaneously heat and ionization signals and operated underground at the Laboratoire Souterrain de Modane in France. The phonon signal was read out using a Transition Edge Sensor made of a NbSi thin film. The detector was biased at $66$ V in order to benefit from the Neganov-Trofimov-Luke amplification and resulting in a resolution on the energy of electron recoils of $4.46$ eV$_{ee}$ (RMS) and an analysis threshold of $30$ eV$_{ee}$. The sensitivity is limited by a dominant background not associated to charge creation in the detector. The search constrains a new region of parameter space for cross-sections down to $10^{-29}$ cm$^2$ and masses between $32$ and $100$ MeV$\cdot$c$^{-2}$. The achieved low threshold with the NbSi sensor shows the relevance of its use for athermal-phonon sensitive devices for low-mass DM searches., Comment: 10 pages, 9 figures
Published: 2022
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7. EXCESS workshop: Descriptions of rising low-energy spectra

Author: Adari, P., Aguilar-Arevalo, A., Amidei, D., Angloher, G., Armengaud, E., Augier, C., Balogh, L., Banik, S., Baxter, D., Beaufort, C., Beaulieu, G., Belov, V., Gal, Y. Ben, Benato, G., Benoît, A., Bento, A., Bergé, L., Bertolini, A., Bhattacharyya, R., Billard, J., Bloch, I. M., Botti, A., Breier, R., Bres, G., Bret, J-. L., Broniatowski, A., Brossard, A., Bucci, C., Bunker, R., Cababie, M., Calvo, M., Camus, P., Cancelo, G., Canonica, L., Cappella, F., Cardani, L., Caron, J. -F., Casali, N., del Castello, G., Cazes, A., Cerulli, R., Vergara, B. A. Cervantes, Chaize, D., Chapellier, M., Chaplinsky, L., Charlieux, F., Chaudhuri, M., Chavarria, A. E., Chemin, G., Chen, R., Chen, H., Chierchie, F., Colantoni, I., Colas, J., Cooley, J., Coquillat, J. -M., Corcoran, E. C., Crawford, S., Crisler, M., Cruciani, A., Cushman, P., D'Addabbo, A., D'Olivo, J. C., Dastgheibi-Fard, A., De Jésus, M., Deng, Y., Dent, J. B., Depaoli, E. L., Dering, K., Dharani, S., Di Lorenzo, S., Drlica-Wagner, A., Dumoulin, L., Durnford, D., Dutta, B., Einfalt, L., Erb, A., Erhart, A., Essig, R., Estrada, J., Etzion, E., Exshaw, O., Favela-Perez, F., Feilitzsch, F. v., Moroni, G. Fernandez, Iachellini, N. Ferreiro, Ferriol, S., Fichtinger, S., Figueroa-Feliciano, E., Filippini, J. -B., Filosofov, D., Formaggio, J. A., Friedl, M., Fuard, S., Fuchs, D., Fuss, A., Gaïor, R., Garai, A., Garrah, C., Gascon, J., Gerbier, G., Ghaith, M., Ghete, V. M., Gift, D., Giomataris, I., Giroux, G., Giuliani, A., Gorel, P., Gorla, P., Goupy, C., Goupy, J., Goy, C., Gros, M., Gros, P., Guardincerri, Y., Guerin, C., Guidi, V., Guillaudin, O., Gupta, S., Guy, E., Harrington, P., Hauff, D., Heine, S. T., Hertel, S. A., Holland, S. E., Hong, Z., Hoppe, E. W., Hossbach, T. W., Ianigro, J. -C., Iyer, V., Jastram, A., Ješkovský, M., Jin, Y., Jochum, J., Johnston, J. P., Juillard, A., Karaivanov, D., Kashyap, V., Katsioulas, I., Kazarcev, S., Kaznacheeva, M., Kelly, F., Kilminster, B., Kinast, A., Klinkenberg, L., Kluck, H., Knights, P., Korn, Y., Kraus, H., von Krosigk, B., Kubik, A., Kurinsky, N. A., Lamblin, J., Langenkämper, A., Langrock, S., Lasserre, T., Lattaud, H., Lautridou, P., Lawson, I., Lee, S. J., Lee, M., Letessier-Selvon, A., Lhuillier, D., Li, M., Lin, Y. -T., Lubashevskiy, A., Mahapatra, R., Maludze, S., Mancuso, M., Manthos, I., Marini, L., Marnieros, S., Martin, R. D., Matalon, A., Matthews, J., Mauri, B., Mayer, D. W., Mazzolari, A., Mazzucato, E., Theenhausen, H. Meyer zu, Michielin, E., Minet, J., Mirabolfathi, N., Mirbach, K. v., Misiak, D., Mitra, P., Mocellin, J-. L., Mohanty, B., Mokina, V., Mols, J. -P., Monfardini, A., Mounier, F., Munagavalasa, S., Muraz, J. -F., Navick, X. -F., Neep, T., Neog, H., Neyrial, H., Nikolopoulos, K., Nilima, A., Nones, C., Novati, V., O'Brien, P., Oberauer, L., Olivieri, E., Olmi, M., Onillon, A., Oriol, C., Orly, A., Orrell, J. L., Ortmann, T., Overman, C. T., Pagliarone, C., Palušová, V., Pari, P., Patel, P. K., Pattavina, L., Petricca, F., Piers, A., Pinckney, H. D., Piro, M. -C., Platt, M., Poda, D., Ponomarev, D., Potzel, W., Povinec, P., Pröbst, F., Privitera, P., Pucci, F., Ramanathan, K., Real, J. -S., Redon, T., Reindl, F., Ren, R., Robert, A., Da Rocha, J., Rodrigues, D., Rogly, R., Rothe, J., Rowe, N., Rozov, S., Rozova, I., Saab, T., Saffold, N., Salagnac, T., Sander, J., Sanglard, V., Santos, D., Sarkis, Y., Savu, V., Savvidis, G., Savvidis, I., Schönert, S., Schäffner, K., Schermer, N., Schieck, J., Schmidt, B., Schmiedmayer, D., Schwertner, C., Scola, L., Settimo, M., Shevchik, Ye., Sibille, V., Sidelnik, I., Singal, A., Smida, R., Haro, M. Sofo, Soldner, T., Stachurska, J., Stahlberg, M., Stefanazzi, L., Stodolsky, L., Strandhagen, C., Strauss, R., Stutz, A., Thomas, R., Thompson, A., Tiffenberg, J., Tomei, C., Traina, M., Uemura, S., Usherov, I., Vagneron, L., Van De Pontseele, W., Fernandez, F. A. Vazquez de Sola, Vidal, M., Vignati, M., Virto, A. L., Vivier, M., Volansky, T., Wagner, V., Wagner, F., Walker, J., Ward, R., Watkins, S. L., Wex, A., Willers, M., Wilson, M. J., Winslow, L., Yakushev, E., Yu, T. -T., Zampaolo, M., Zaytsev, A., Zema, V., Zinatulina, D., and Zolotarova, A.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract: Many low-threshold experiments observe sharply rising event rates of yet unknown origins below a few hundred eV, and larger than expected from known backgrounds. Due to the significant impact of this excess on the dark matter or neutrino sensitivity of these experiments, a collective effort has been started to share the knowledge about the individual observations. For this, the EXCESS Workshop was initiated. In its first iteration in June 2021, ten rare event search collaborations contributed to this initiative via talks and discussions. The contributing collaborations were CONNIE, CRESST, DAMIC, EDELWEISS, MINER, NEWS-G, NUCLEUS, RICOCHET, SENSEI and SuperCDMS. They presented data about their observed energy spectra and known backgrounds together with details about the respective measurements. In this paper, we summarize the presented information and give a comprehensive overview of the similarities and differences between the distinct measurements. The provided data is furthermore publicly available on the workshop's data repository together with a plotting tool for visualization., Comment: 44 pages, 20 figures; Editors: A. Fuss, M. Kaznacheeva, F. Reindl, F. Wagner; updated copyright statements and funding information
Published: 2022
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8. High impedance TES bolometers for EDELWEISS

Author: Marnieros, S., Armengaud, E., Arnaud, Q., Augier, C., Benoît, A., Bergé, L., Billard, J., Broniatowski, A., Camus, P., Cazes, A., Chapellier, M., Charlieux, F., De Jésus, M., Dumoulin, L., Eitel, K., Fillipini, J. -B., Filosofov, D., Gascon, J., Giuliani, A., Gros, M., Jin, Y., Juillard, A., Kleifges, M., Lattaud, H., Misiak, D., Navick, X. -F., Nones, C., Olivieri, E., Oriol, C., Pari, P., Paul, B., Poda, D., Rozov, S., Salagnac, T., Sanglard, V., Vagneron, L., Yakushev, E., and Zolotarova, A.
Subjects: Physics - Instrumentation and Detectors
Abstract: The EDELWEISS collaboration aims for direct detection of light dark matter using germanium cryogenic detectors with low threshold phonon sensor technologies and efficient charge readout designs. We describe here the development of Ge bolometers equipped with high impedance thermistors based on a NbxSi1-x TES alloy. High aspect ratio spiral designs allow the TES impedance to match with JFET or HEMT front-end amplifiers. We detail the behavior of the superconducting transition properties of these sensors and the detector optimization in terms of sensitivity to out-of-equilibrium phonons. We report preliminary results of a 200 g Ge detector that was calibrated using 71Ge activation by neutrons at the LSM underground laboratory., Comment: Submitted to Journal of Low Temperature Physics, Special Issue for the 19th International Workshop on Low Temperature Detectors 19-29 July 2021 (Virtual event hold by NIST)
Published: 2022
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9. Low-mass Dark Matter searches with EDELWEISS

Author: Gascon, J., Armengaud, E., Arnaud, Q., Augier, C., Benoit, A., Bergé, L., Billard, J., Broniatowski, A., Camus, P., Cazes, A., Chapellier, M., Charlieux, F., De Jésus, M., Dumoulin, L., Eitel, K., Filippini, J. -B., Filosofov, D., Giuliani, A., Gros, M., Jin, Y., Juillard, A., Kleifges, M., Lattaud, H., Marnieros, S., Misiak, D., Navick, X. -F., Nones, C., Olivieri, E., Oriol, C., Pari, P., Paul, B., Poda, D., Rozov, S., Salagnac, T., Sanglard, V., Vagneron, L., Yakushev, E., and Zolotarova, A.
Subjects: Physics - Instrumentation and Detectors
Abstract: The EDELWEISS collaboration searches for light Dark Matter (DM) particles using germanium detectors equipped with a charge and phonon signal readout. Using the Neganov-Trofimov-Luke effect, an rms resolution of 0.53 electron-hole pair was obtained on a massive (33.4 g) Ge detector operated underground at the Laboratoire Souterrain de Modane. This record sensitivity made possible a search for Dark Photon DM down to 1 eV/c2 and to DM-electron interactions below 1 MeV/c2. This demonstrates for the first time the high relevance of cryogenic Ge detectors in searches at low thresholds and is an important step of the development of Ge detectors with improved performance in the context of the EDELWEISS-SubGeV program., Comment: Submitted to Journal of Low Temperature Physics, Special Issue for the 19th International Workshop on Low Temperature Detectors 19-29 July 2021 (Virtual event hold by NIST)
Published: 2021

10. Development of data processing and analysis pipeline for the RICOCHET experiment

Author: Colas, J., Billard, J., Ferriol, S., Gascon, J., and Salagnac, T.
Subjects: Physics - Instrumentation and Detectors
Abstract: Achieving a percentage-level precision measurement of the Coherent Elastic Neutrino Nucleus Scattering (CE{\nu}NS) spectrum requires a robust data processing pipeline which can be characterised with great precision. To fulfil this goal we present hereafter a new Python-based data processing pipeline specifically designed for temporal data analysis and pulse amplitude estimation. This pipeline features a data generator allowing to accurately simulate the expected data stream from the RICOCHET experiment at the Institut Laue Langevin (ILL) nuclear reactor, including both background and CE{\nu}NS signals. This data generator is pivotal to fully understand and characterise the data processing overall efficiency, its reconstruction biases, and to properly optimise its configuration parameters. We show that thanks to this optimized data processing pipeline, the CryoCube detector array will be able to achieve a 70 eV energy threshold combined with electronic/nuclear recoil discrimination down to {\sim}100 eV, hence fulfilling the RICOCHET targeted performance.
Published: 2021
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11. Optimization and performance of the CryoCube detector for the future RICOCHET low-energy neutrino experiment

Author: Salagnac, T., Billard, J., Colas, J., Chaize, D., De Jesus, M., Dumoulin, L., Filippini, J. -B., Gascon, J., Juillard, A., Lattaud, H., Marnieros, S., Misiak, D., Oriol, C., Vagneron, L., and collaboration, the RICOCHET
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: The RICOCHET reactor neutrino observatory is planned to be installed at Institut Laue-Langevin starting in mid-2022. The scientific goal of the RICOCHET collaboration is to perform a low-energy and percentage-precision CENNS measurement in order to explore exotic physics scenarios beyond the standard model. To that end, RICOCHET will host two cryogenic detector arrays : the CryoCube (Ge target) and the Q-ARRAY (Zn target), both with unprecedented sensitivity to O(10)eV nuclear recoils. The CryoCube will be composed of 27 Ge crystals of 38g instrumented with NTD-Ge thermal sensor as well as aluminum electrodes operated at 10mK in order to measure both the ionization and the heat energies arising from a particle interaction. To be a competitive CENNS detector, the CryoCube array is designed with the following specifications : a low energy threshold ($\sim 50$eV), the ability to identify and reject with a high efficiency the overwhelming electromagnetic backgrounds (gamma, betas, X-rays) and a sufficient payload ($\sim 1$kg). After a brief introduction of the future RICOCHET experiment and its CryoCube, the current works and first performance results on the optimization of the heat channel and the electrode designs will be presented. We conclude with a preliminary estimation of the CryoCube sensitivity to the CENNS signal within RICOCHET., Comment: Submitted to Journal of Low Temperature Physics, Special Issue for the 19th International Workshop on Low Temperature Detectors 19-29 July 2021 (Virtual event hold by NIST)
Published: 2021

12. HEMT-based 1K front-end electronics for the heat and ionization Ge CryoCube of the future RICOCHET CE$\nu$NS experiment

Author: Baulieu, G., Billard, J., Bres, G., Bret, J-L, Chaize, D., Colas, J., Dong, Q., Exshaw, O., Guerin, C., Ferriol, S., Filippini, J-B, De Jesus, M., Jin, Y., Juillard, A., Lamblin, J., Lattaud, H., Minet, J., Misiak, D., Monfardini, A., Rarbi, F., Salagnac, T., Vagneron, L., and Collaboration, the RICOCHET
Subjects: Physics - Instrumentation and Detectors
Abstract: The RICOCHET reactor neutrino observatory is planned to be installed at the Laue Langevin Institute (ILL) starting mid-2022. Its scientific goal is to perform a low-energy and high precision measurement of the coherent elastic neutrino-nucleus scattering (CE$\nu$NS) spectrum in order to explore exotic physics scenarios. RICOCHET will host two cryogenic detector arrays: the CryoCube (Ge target) and the Q-ARRAY (Zn target), operated at 10 mK. The 1 kg Ge CryoCube will consist of 27 Ge crystals instrumented with NTD-Ge thermal sensors and charge collection electrodes for a simultaneous heat and ionization readout to reject the electromagnetic backgrounds (gamma, beta, x-rays). We present the status of its front-end electronics. The first stage of amplification is made of High Electron Mobility Transistor (HEMT) developed by CNRS/C2N laboratory, optimized to achieve ultra-low noise performance at 1K with a dissipation as low as 15 $\mu$W per channel. Our noise model predicts that 10 eV heat and 20 eVee RMS baseline resolutions are feasible with a high dynamic range for the deposited energy (up to 10 MeV) thanks to loop amplification schemes. Such resolutions are mandatory to have a high discrimination power between nuclear and electron recoils at the lowest energies., Comment: submitted to Journal of Low Temperature Physics. Special Issue for the 19th International Workshop on Low Temperature Detectors 19-29 July 2021 - Virtual event hold by NIST
Published: 2021
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13. Ricochet Progress and Status

Author: Ricochet Collaboration, Beaulieu, G., Belov, V., Berge, L., Billard, J., Bres, G., Bret, J-. L., Broniatowski, A., Calvo, M., Cazes, A., Chaize, D., Chapellier, M., Chaplinsky, L., Chemin, G., Chen, R., Colas, J., De Jesus, M., de Marcillac, P., Dumoulin, L., Exshaw, O., Ferriol, S., Figueroa-Feliciano, E., Filippini, J. B., Formaggio, J. A., Fuard, S., Gascon, J., Giuliani, A., Goupy, J., Goy, C., Guerin, C., Hirjibehedin, C. F., Harrington, P., Heine, S. T., Hertel, S. A., Heusch, M., Hoarau, C., Hong, Z., Ianigro, J. -C., Jin, Y., Johnston, J. P., Juillard, A., Kazarcev, S., Lamblin, J., Lattaud, H., Lubashevskiy, A., Mayer, D. W., Marnieros, S., Minet, J., Misiak, D., Monfardini, A., Mounier, F., Olivieri, E., Oriol, C., Patel, P. K., Perbet, E., Pinckney, H. D., Ponomarev, D., Poda, D., Rarbi, F., Real, J. -S., Ricol, J. -S., Redon, T., Robert, A., Rozov, S., Rozova, I., Salagnac, T., Sanglard, V., Schmidt, B., Shevchik, Ye., Sibille, V., Soldner, T., Stachurska, J., Stutz, A., Vagneron, L., Van De Ponteseele, W., Vezzu, F., Weber, S., Winslow, L., Yakushev, E., and Zinatulina, D.
Subjects: Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract: We present an overview of recent progress towards the Ricochet coherent elastic neutrino nucleus scattering CE$\nu$NS experiment. The ILL research reactor in Grenoble, France has been selected as the experiment site, after in situ studies of vibration and particle backgrounds. We present background rate estimates specific to that site, along with descriptions of the planned CryoCube and Q-Array detector payloads., Comment: Proceedings for the 19th International Workshop on Low Temperature Detectors (LTD19)
Published: 2021

14. Searching for Hidden Neutrons with a Reactor Neutrino Experiment: Constraints from the STEREO Experiment

Author: Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Sanchez, P. del Amo, Atmani, I. El, Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Materna, T., Méplan, O., Pessard, H., Pignol, G., Réal, J. -S., Ricol, J. -S., Roca, C., Rogly, R., Salagnac, T., Sarrazin, M., Savu, V., Schoppmann, S., Soldner, T., Stutz, A., and Vialat, M.
Subjects: High Energy Physics - Experiment, Nuclear Experiment
Abstract: Different extensions of the standard model of particle physics, such as braneworld or mirror matter models, predict the existence of a neutron sterile state, possibly as a dark matter candidate. This Letter reports a new experimental constraint on the probability $p$ for neutron conversion into a hidden neutron, set by the STEREO experiment at the high flux reactor of the Institut Laue-Langevin. The limit is $p<3.1\times 10^{-11}$ at $95 \%$ C.L. improving the previous limit by a factor 13. This result demonstrates that short-baseline neutrino experiments can be used as competitive passing-through-walls neutron experiments to search for hidden neutrons., Comment: 5 pages, 3 figures
Published: 2021
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15. Joint Measurement of the $^{235}$U Antineutrino Spectrum by Prospect and Stereo

Author: Almazán, H., Andriamirado, M., Balantekin, A. B., Band, H. R., Bass, C. D., Bergeron, D. E., Bernard, L., Blanchet, A., Bonhomme, A., Bowden, N. S., Bryan, C. D., Buck, C., Classen, T., Conant, A. J., Deichert, G., Sanchez, P. del Amo, Delgado, A., Diwan, M. V., Dolinski, M. J., Atmani, I. El, Erickson, A., Foust, B. T., Gaison, J. K., Galindo-Uribarri, A., Gilbert, C. E., Hans, S., Hansell, A. B., Heeger, K. M., Heffron, B., Jaffe, D. E., Jayakumar, S., Ji, X., Jones, D. C., Koblanski, J., Kyzylova, O., Labit, L., Lamblin, J., Lane, C. E., Langford, T. J., LaRosa, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Littlejohn, B. R., Lu, X., Maricic, J., Materna, T., Mendenhall, M. P., Meyer, A. M., Milincic, R., Mueller, P. E., Mumm, H. P., Napolitano, J., Neilson, R., Nikkel, J. A., Nour, S., Palomino, J. L., Pessard, H., Pushin, D. A., Qian, X., Réal, J. -S., Ricol, J. -S., Roca, C., Rogly, R., Rosero, R., Salagnac, T., Savu, V., Schoppmann, S., Searles, M., Sergeyeva, V., Soldner, T., Stutz, A., Surukuchi, P. T., Tyra, M. A., Varner, R. L., Venegas-Vargas, D., Vialat, M., Weatherly, P. B., White, C., Wilhelmi, J., Woolverton, A., Yeh, M., Zhang, C., and Zhang, X.
Subjects: Nuclear Experiment, High Energy Physics - Experiment
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 $\chi^2/\mathrm{ndf} = 24.1/21$, allowing a joint unfolding of the prompt energy measurements into antineutrino energy. This $\bar{\nu}_e$ 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 $\chi^2$ value is improved, corresponding to a $2.4\sigma$ significance.
Published: 2021
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16. Ricochet Progress and Status

Author: Augier, C., Beaulieu, G., Belov, V., Berge, L., Billard, J., Bres, G., Bret, J. -L., Broniatowski, A., Calvo, M., Cazes, A., Chaize, D., Chapellier, M., Chaplinsky, L., Chemin, G., Chen, R., Colas, J., de Jesus, M., de Marcillac, P., Dumoulin, L., Exshaw, O., Ferriol, S., Figueroa-Feliciano, E., Filippini, J. -B., Formaggio, J. A., Fuard, S., Gascon, J., Giuliani, A., Goupy, J., Goy, C., Guerin, C., Hirjibehedin, C. F., Harrington, P., Heine, S. T., Hertel, S. A., Heusch, M., Hoarau, C., Hong, Z., Ianigro, J. -C., Jin, Y., Johnston, J. P., Juillard, A., Kazarcev, S., Lamblin, J., Lattaud, H., Lubashevskiy, A., Mayer, D. W., Marnieros, S., Minet, J., Misiak, D., Monfardini, A., Mounier, F., Olivieri, E., Oriol, C., Patel, P. K., Perbet, E., Pinckney, H. D., Ponomarev, D., Poda, D., Rarbi, F., Real, J. -S., Ricol, J. -S., Redon, T., Robert, A., Rozov, S., Rozova, I., Salagnac, T., Sanglard, V., Schmidt, B., Shevchik, Ye., Sibille, V., Soldner, T., Stachurska, J., Stutz, A., Vagneron, L., van de Pontseele, W., Vezzu, F., Weber, S., Winslow, L., Yakushev, E., and Zinatulina, D.
Published: 2023
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17. Optimization and Performance of the CryoCube Detector for the Future Ricochet Low-Energy Neutrino Experiment

Author: Salagnac, T., Billard, J., Colas, J., Chaize, D., De Jesus, M., Dumoulin, L., Filippini, J.-B., Gascon, J., Juillard, A., Lattaud, H., Marnieros, S., Misiak, D., Oriol, C., and Vagneron, L.
Published: 2023
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18. First antineutrino energy spectrum from $^{235}$U fissions with the STEREO detector at ILL

Author: STEREO collaboration, Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Sanchez, P. del Amo, Atmani, I. El, 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., Sergeyeva, V., Soldner, T., Stutz, A., and Vialat, M.
Subjects: High Energy Physics - Experiment, Physics - Instrumentation and Detectors
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 pure $^{235}$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 $E_\nu \simeq 5.3$ MeV. A gaussian fit of this local excess leads to an amplitude of $A = 12.1 \pm 3.4\%$ (3.5$\sigma$)., Comment: This is the Accepted Manuscript version of an article accepted for publication in J. Phys. G: Nucl. Part. Phys.. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6471/abd37a. 34 pages, 14 figures
Published: 2020
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19. Accurate Measurement of the Electron Antineutrino Yield of U-235 Fissions from the STEREO Experiment with 119 Days of Reactor-On Data

Author: STEREO Collaboration, Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Sanchez, P. del Amo, Atmani, I. El, Haser, J., Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Materna, T., Minotti, A., Onillon, A., Pessard, H., Réal, J. -S., Roca, C., Rogly, R., Salagnac, T., Savu, V., Schoppmann, S., Sergeyeva, V., Soldner, T., Stutz, A., and Vialat, M.
Subjects: High Energy Physics - Experiment, Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract: We report a measurement of the antineutrino rate from the fission of U-235 with the STEREO detector using 119 days of reactor turned on. In our analysis, we perform several detailed corrections and achieve the most precise single measurement at reactors with highly enriched U-235 fuel. We measure an IBD cross section per fission of $\sigma_f$ = (6.34 $\pm$ 0.06 [stat] $\pm$ 0.15 [sys] $\pm$ 0.15 [model]) $\times$ 10${}^{-43}$ cm${}^{2}$/fission and observe a rate deficit of (5.2 $\pm$ 0.8 [stat] $\pm$ 2.3 [sys] $\pm$ 2.3 [model])% compared to the model, consistent with the deficit of the world average. Testing U-235 as the sole source of the deficit, we find a tension between the results of lowly and highly enriched U-235 fuel of 2.1 standard deviations., Comment: 7 pages, 1 figure
Published: 2020
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20. First germanium-based constraints on sub-MeV Dark Matter with the EDELWEISS experiment

Author: EDELWEISS Collaboration, Arnaud, Q., Armengaud, E., Augier, C., Benoît, A., Bergé, L., Billard, J., Broniatowski, A., Camus, P., Cazes, A., Chapellier, M., Charlieux, F., De Jésus, M., Dumoulin, L., Eitel, K., Elkhoury, E., Fillipini, J. -B., Filosofov, D., Gascon, J., Giuliani, A., Gros, M., Jin, Y., Juillard, A., Kleifges, M., Lattaud, H., Marnieros, S., Misiak, D., Navick, X. -F., Nones, C., Olivieri, E., Oriol, C., Pari, P., Paul, B., Poda, D., Rozov, S., Salagnac, T., Sanglard, V., Siebenborn, B., Vagneron, L., Weber, M., Yakushev, E., and Zolotarova, A.
Subjects: Astrophysics - Astrophysics of Galaxies, Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract: The EDELWEISS collaboration has performed a search for Dark Matter (DM) particles interacting with electrons using a 33.4 g Ge cryogenic detector operated underground at the LSM. A charge resolution of 0.53 electron-hole pairs (RMS) has been achieved using the Neganov-Trofimov-Luke amplification with a bias of 78 V. We set the first Ge-based constraints on sub-MeV/c$^{2}$ DM particles interacting with electrons, as well as on dark photons down to 1 eV/c$^2$. These are competitive with other searches. In particular, new limits are set on the kinetic mixing of dark photon DM in a so far unconstrained parameter space region in the 6 to 9 eV/c$^2$ mass range. These results demonstrate the high relevance of cryogenic Ge detectors for the search of DM interactions producing eV-scale electron signals., Comment: 6 pages, 4 figures, corrected typos
Published: 2020
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21. Improved Sterile Neutrino Constraints from the STEREO Experiment with 179 Days of Reactor-On Data

Author: STEREO Collaboration, Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Sanchez, P. del Amo, Atmani, I. El, Haser, J., Kandzia, F., Kox, S., Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Materna, T., Minotti, A., Pessard, H., Réal, J. -S., Roca, C., Rogly, R., Salagnac, T., Savu, V., Schoppmann, S., Sergeyeva, V., Soldner, T., Stutz, A., and Vialat, M.
Subjects: High Energy Physics - Experiment, Physics - Instrumentation and Detectors
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 gamma-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., Comment: 31 pages, 35 figures, for supplemental data see http://doi.org/10.17182/hepdata.92323
Published: 2019
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22. Results from a prototype TES detector for the Ricochet experiment

Author: Augier, C., Baulieu, G., Belov, V., Bergé, L., Billard, J., Bres, G., Bret, J-.L., Broniatowski, A., Calvo, M., Cazes, A., Chaize, D., Chala, M., Chang, C.L., Chapellier, M., Chaplinsky, L., Chemin, G., Chen, R., Colas, J., Cudmore, E., De Jesus, M., de Marcillac, P., Dumoulin, L., Exshaw, O., Ferriol, S., Figueroa-Feliciano, E., Filippini, J.-B., Formaggio, J.A., Fuard, S., Gannon, K., Gascon, J., Giuliani, A., Goupy, J., Goy, C., Guerin, C., Guy, E., Harrington, P., Hertel, S.A., Heusch, M., Hong, Z., Ianigro, J.-C., Jin, Y., Juillard, A., Karaivanov, D., Kazarcev, S., Lamblin, J., Lattaud, H., Li, M., Lisovenko, M., Lubashevskiy, A., Marnieros, S., Martini, N., Mayer, D.W., Minet, J., Monfardini, A., Mounier, F., Novati, V., Olivieri, E., Oriol, C., Ovalle Mateo, L., Palladino, K.J., Patel, P.K., Perbet, E., Pinckney, H.D., Poda, D.V., Ponomarev, D., Rarbi, F., Real, J.-S., Redon, T., Reyes, F.C., Ricol, J.-S., Robert, A., Rozov, S., Rozova, I., Salagnac, T., Schmidt, B., Scorza, S., Shevchik, Ye., Soldner, T., Stachurska, J., Stutz, A., Vagneron, L., Van De Pontseele, W., Veihmeyer, C., Vezzu, F., Wang, G., Winslow, L., Yakushev, E., Yefremenko, V.G., Zhang, J., and Zinatulina, D.
Published: 2023
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23. Improved STEREO simulation with a new gamma ray spectrum of excited gadolinium isotopes using FIFRELIN

Author: Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Chebboubi, A., Sanchez, P. del Amo, Atmani, I. El, Haser, J., Kandzia, F., Kox, S., Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Lindner, M., Litaize, O., Materna, T., Minotti, A., Pessard, H., Réal, J. -S., Roca, C., Salagnac, T., Savu, V., Schoppmann, S., Sergeyeva, V., Soldner, T., Stutz, A., Thulliez, L., and Vialat, M.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
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
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24. HEMT-Based 1 K Front-End Electronics for the Heat and Ionization Ge CryoCube of the Future Ricochet CEνNS Experiment

Author: Baulieu, G., Billard, J., Bres, G., Bret, J.-L., Chaize, D., Colas, J., Dong, Q., Exshaw, O., Guerin, C., Ferriol, S., Filippini, J.-B., De Jesus, M., Jin, Y., Juillard, A., Lamblin, J., Lattaud, H., Minet, J., Misiak, D., Monfardini, A., Rarbi, F., Salagnac, T., and Vagneron, L.
Published: 2022
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25. Improved FIFRELIN de-excitation model for neutrino applications

Author: Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Chalil, A., Chebboubi, A., Sanchez, P. del Amo, Atmani, I. El, Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Litaize, O., Materna, T., Pessard, H., Réal, J.-S., Ricol, J.-S., Roca, C., Rogly, R., Salagnac, T., Savu, V., Schoppmann, S., Soldner, T., Stutz, A., Thulliez, L., and Vialat, M.
Published: 2023
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26. Sterile Neutrino Constraints from the STEREO Experiment with 66 days of Reactor-on Data

Author: Almazán, H., Sanchez, P. del Amo, Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Favier, J., Haser, J., Hélaine, V., Kandzia, F., Kox, S., Lamblin, J., Letourneau, A., Lhuillier, D., Lindner, M., Manzanillas, L., Materna, T., Minotti, A., Montanet, F., Pessard, H., Real, J. -S., Roca, C., Salagnac, T., Schoppmann, S., Sergeyeva, V., Soldner, T., Stutz, A., and Zsoldos, S.
Subjects: High Energy Physics - Experiment
Abstract: The reactor antineutrino anomaly might be explained by the oscillation of reactor antineutrinos toward a sterile neutrino of eV mass. In order to explore this hypothesis, the STEREO experiment measures the antineutrino energy spectrum in six different detector cells covering baselines between 9 and 11 m from the compact core of the ILL research reactor. In this Letter, results from 66 days of reactor turned on and 138 days of reactor turned off are reported. A novel method to extract the antineutrino rates has been developed based on the distribution of the pulse shape discrimination parameter. The test of a new oscillation toward a sterile neutrino is performed by comparing ratios of cells, independent of absolute normalization and of the prediction of the reactor spectrum. The results are found to be compatible with the null oscillation hypothesis and the best fit of the reactor antineutrino anomaly is excluded at 97.5\% C.L.
Published: 2018
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27. The STEREO Experiment

Author: Allemandou, N., Almazán, H., Sanchez, P. del Amo, Bernard, L., Bernard, C., Blanchet, A., Bonhomme, A., Bosson, G., Bourrion, O., Bouvier, J., Buck, C., Caillot, V., Chala, M., Champion, P., Charon, P., Collin, A., Contrepois, P., Coulloux, G., Desbrières, B., Deleglise, G., Kanawati, W. El, Favier, J., Fuard, S., Monteiro, I. Gomes, Gramlich, B., Haser, J., Helaine, V., Heusch, M., Jentschel, M., Kandzia, F., Konrad, G., Köster, U., Kox, S., Lahonde-Hamdoun, C., Lamblin, J., Letourneau, A., Lhuillier, D., Li, C., Lindner, M., Manzanillas, L., Materna, T., Méplan, O., Minotti, A., Monon, C., Montanet, F., Nunio, F., Peltier, F., Penichot, Y., Pequignot, M., Pessard, H., Piret, Y., Prono, G., Quéméner, G., Real, J. -S., Roca, C., Salagnac, T., Sergeyeva, V., Schoppmann, S., Scola, L., Scordilis, J. -P., Soldner, T., Stutz, A., Tourres, D., Vescovi, C., and Zsoldos, S.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: The STEREO experiment is a very short baseline reactor antineutrino experiment aiming at testing the hypothesis of light sterile neutrinos as an explanation of the deficit of the observed neutrino interaction rate with respect to the predicted rate, known as the Reactor Antineutrino Anomaly. The detector center is located 10 m away from the compact, highly $^{235}$U enriched core of the research nuclear reactor of the Institut Laue Langevin in Grenoble, France. This paper describes the STEREO site, the detector components and associated shielding designed to suppress the external sources of background which were characterized on site. It reports the performances in terms of detector response and energy reconstruction., Comment: 32 pages, 17 figures
Published: 2018
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28. Fast neutron background characterization of the future Ricochet experiment at the ILL research nuclear reactor

Author: Augier, C., Baulieu, G., Belov, V., Berge, L., Billard, J., Bres, G., Bret, J-. L., Broniatowski, A., Calvo, M., Cazes, A., Chaize, D., Chapellier, M., Chaplinsky, L., Chemin, G., Chen, R., Colas, J., De Jesus, M., de Marcillac, P., Dumoulin, L., Exshaw, O., Ferriol, S., Figueroa-Feliciano, E., Filippini, J. -B., Formaggio, J. A., Fuard, S., Gascon, J., Giuliani, A., Goupy, J., Goy, C., Guerin, C., Guy, E., Harrington, P., Heine, S. T., Hertel, S. A., Heusch, M., Hirjibehedin, C. F., Hong, Z., Ianigro, J.-C., Jin, Y., Johnston, J. P., Juillard, A., Karaivanov, D., Kazarcev, S., Lamblin, J., Lattaud, H., Li, M., Lubashevskiy, A., Marnieros, S., Mayer, D. W., Minet, J., Misiak, D., Mocellin, J-.L., Monfardini, A., Mounier, F., Oliver, W. D., Olivieri, E., Oriol, C., Patel, P. K., Perbet, E., Pinckney, H. D., Poda, D., Ponomarev, D., Rarbi, F., Real, J.-S., Redon, T., Robert, A., Rozov, S., Rozova, I., Salagnac, T., Sanglard, V., Schmidt, B., Shevchik, Ye., Sibille, V., Soldner, T., Stachurska, J., Stutz, A., Vagneron, L., Van De Pontseele, W., Vezzu, F., Weber, S., Winslow, L., Yakushev, E., and Zinatulina, D.
Published: 2023
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29. Trigger and readout electronics for the STEREO experiment

Author: Bourrion, O., Bouly, J. L., Bouvier, J., Bosson, G., Helaine, V., Lamblin, J., Li, C., Montanet, F., Real, J. S., Salagnac, T., Ponchant, N., Stutz, A., Tourres, D., Vescovi, C., and Zsoldos, S.
Subjects: Physics - Instrumentation and Detectors
Abstract: The STEREO experiment will search for a sterile neutrino by measuring the anti-neutrino energy spectrum as a function of the distance from the source, the ILL nuclear reactor. A dedicated electronic system, hosted in a single microTCA crate, was designed for this experiment. It performs triggering in two stages with various selectable conditions, processing and readout via UDP/IPBUS of 68 photomultiplier signals continuously digitized at 250 MSPS. Additionally, for detector performance monitoring, the electronics allow on-line calibration by driving LED synchronously with the data acquisition. This paper describes the electronics requirements, architecture and the performances achieved., Comment: Topical Workshop on Electronics for Particle Physics (TWEPP) 2015, Lisboa. 9 pages, 9 figures
Published: 2015
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30. High Impedance TES Bolometers for EDELWEISS

Author: Marnieros, S., primary, Armengaud, E., additional, Arnaud, Q., additional, Augier, C., additional, Benoît, A., additional, Bergé, L., additional, Billard, J., additional, Broniatowski, A., additional, Camus, P., additional, Cazes, A., additional, Chapellier, M., additional, Charlieux, F., additional, De Jésus, M., additional, Dumoulin, L., additional, Eitel, K., additional, Fillipini, J.-B., additional, Filosofov, D., additional, Gascon, J., additional, Giuliani, A., additional, Gros, M., additional, Jin, Y., additional, Juillard, A., additional, Kleifges, M., additional, Lattaud, H., additional, Misiak, D., additional, Navick, X.-F., additional, Nones, C., additional, Olivieri, E., additional, Oriol, C., additional, Pari, P., additional, Paul, B., additional, Poda, D., additional, Rozov, S., additional, Salagnac, T., additional, Sanglard, V., additional, Vagneron, L., additional, Yakushev, E., additional, and Zolotarova, A., additional
Published: 2022
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31. STEREO neutrino spectrum of 235U fission rejects sterile neutrino hypothesis

Author: 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

32. High Energy Physics Opportunities Using Reactor Antineutrinos

Author: 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. Z., Qi, M., Qian, X., Raper, N., Ren, J., Reveco, C. Morales, Rosero, R., Roskovec, B., Ruan, X. C., Steiner, H., Sun, J. L., Tmej, T., Treskov, K., Tse, W. -H, Tull, C. E., Viren, B., Vorobel, V., Wang, C. H., Wang, J., Wang, M., Wang, N. Y., Wang, R. G., Wang, W., Wang, X., Wang, Y., Wang, Y. F., Wang, Z., Wang, Z. M., Wei, H. Y., Wei, L. H., Wen, L. J., Whisnant, K., White, C. G., Wong, H. L. H., Worcester, E., Wu, D. R., Wu, F. L., Wu, Q., Wenjie Wu, Xia, D. M., Xie, Z. Q., Xing, Z. Z., Xu, J. L., Xu, T., Xue, T., Yang, C. G., Yang, L., Yang, Y. Z., Yao, H. F., Ye, M., Yeh, M., Young, B. L., Yu, H. Z., Yu, Z. Y., Yue, B. B., Zeng, S., Zeng, Y., Zhan, L., Zhang, C., Zhang, F. Y., Zhang, H. H., Zhang, J. W., Zhang, Q. M., Zhang, X. T., Zhang, Y. M., Zhang, Y. X., Zhang, Y. Y., Zhang, Z. J., Zhang, Z. P., Zhang, Z. Y., Zhao, J., Zhou, L., Zhuang, H. L., Zou, J. H., Abusleme, A., Adam, T., Ahmad, S., Ahmed, R., Aiello, S., An, G. P., An, Q., Andronico, G., Anfimov, N., Antonelli, V., Antoshkina, T., Asavapibhop, B., André, J. P. A. M., Auguste, D., Babic, A., Baldini, W., Barresi, A., Baussan, E., Bellato, M., Bergnoli, A., Bernieri, E., Birkenfeld, T., Blin, S., Blum, D., Bolshakova, A., Bongrand, M., Bordereau, C., Breton, D., Brigatti, A., Brugnera, R., Bruno, R., Budano, A., Buesken, M., Buscemi, M., Busto, Jose, Butorov, I., Cabrera, A., Cai, H., Cai, X., Cai, Y. K., Cai, Z. Y., Cammi, A., Campeny, A., Cao, C. Y., Caruso, R., Cerna, C., Chakaberia, I., Chen, P. P., Chen, P. A., Chen, S., Chen, X., Chen, Y. W., Chen, Z., Cheng, Y., Chiesa, D., Chimenti, P., Chukanov, A., Chuvashova, A., Claverie, G., Clementi, C., Clerbaux, B., Di Lorenzo, S., Corti, D., Costa, S., Corso, F. D., La Taille, C., Deng, J., Deng, Z., Deng, Z. Y., Depnering, W., Diaz, M., Ding, X. F., Dirgantara, B., Dmitrievsky, S., Donchenko, G., Dong, J. M., Dornic, D., Doroshkevich, E., Dracos, M., Druillole, F., Du, S. 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P., Jollet, C., Joutsenvaara, J., Jungthawan, S., Kalousis, L., Kampmann, P., Karagounis, M., Kazarian, N., Khan, A., Khan, W., Khosonthongkee, K., Kinz, P., Korablev, D., Kouzakov, K., Krasnoperov, A., Krumshteyn, Z., Kruth, A., Kutovskiy, N., Kuusiniemi, P., Lachenmaier, T., Landini, C., Leblanc, S., Lebrin, V., Lefevre, F., Lei, R., Leung, J., Li, C., Li, D., Li, H., Li, J., Li, K. J., Li, M. Z., Li, M., Li, N., Li, R. H., Li, S. F., Li, S. J., Li, T., Li, W. G., Li, X. M., Li, X. L., Li, Y., Li, Z., Li, Z. Y., Liang, J. J., Liebau, D., Limphirat, A., Limpijumnong, S., Lin, S. X., Lin, T., Lippi, I., Liu, F., Liu, H. D., Liu, H. B., Liu, H. J., Liu, H. T., Liu, H., Liu, M., Liu, Q., Liu, R. X., Liu, S. Y., Liu, S. B., Liu, S. L., Liu, X. W., Liu, X., Liu, Y., Lokhov, A., Lombardi, P., Lombardo, C., Loo, K., Lu, J. B., Lu, J. G., Lu, S. X., Lu, X. X., Lubsandorzhiev, B., Lubsandorzhiev, S., Ludhova, L., Luo, F. J., Luo, G., Luo, P. W., Luo, S., Luo, W. M., Lyashuk, V., Ma, Q. 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P., Bryan, C. D., Carr, R., Classen, T., Conant, A. J., Deichert, G., Dolinski, M. J., Erickson, A., Foust, B. T., Gaison, J. K., Galindo-Uribarri, A., Gilbert, C. E., Grant, C., Hackett, B. T., Hansell, A. B., Ji, X., Jones, D. C., Kyzylova, O., Lane, C. E., Larosa, J., Lu, X., Mendenhall, M. P., Meyer, A. M., Milincic, R., Mitchell, I., Mueller, P. E., Nave, C., Neilson, R., Nikkel, J. A., Norcini, D., Nour, S., Palomino, J. L., Pushin, D. A., Romero-Romero, E., Surukuchi, P. T., Tyra, M. A., Varner, R. L., Venegas-Vargas, D., Weatherly, P. B., White, C., Wilhelmi, J., Woolverton, A., Zhang, A., Zhang, X., Choi, J. H., Jang, H. I., Jang, J. S., Jeon, S. H., Joo, K. K., Ju, K., Jung, D. E., Kim, J. H., Kim, S. B., Kim, S. Y., Kim, W., Kwon, E., Lee, D. H., Lee, H. G., Lim, I. T., Moon, D. H., Pac, M. Y., Seo, H., Seo, J. W., Shin, C. D., Yang, B. S., Yoo, J., Yoon, S. G., Yeo, I. S., Chang, C., Bergé, L., Broniatowski, A., Dumoulin, L., Giuliani, A., Chapellier, M., Marcillac, P., Marnieros, S., Olivieri, E., Poda, D., Calvo, M., Goupy, J., Monfardini, A., Arnaud, Q., Augier, C., Billard, J., Cazes, A., Colas, J., Filippini, J., Gascon, J., Jesus, M., Lattaud, H., Juillard, A., Salagnac, T., Soldner, T., Lubashevskiy, A., Yakushev, E., Rozov, S., Lamblin, J., Mom, B., Stutz, A., Formaggio, J. A., Mayer, D. W., Johnston, J., Harrington, P., Heine, S., Sibille, V., Chen, R., Figueroa-Feliciano, E., Ziqing, H., Hertel, S., Patel, P., Pinckney, D., Serafin, A., Shilcusky, A., Decheine, N., Palladino, K., Weber, S., Hirjibehedin, C., Akindele, O. A., Carman, L., Dazeley, S., Ford, M., Jovanovic, I., Sutanto, F., Zaitseva, N., Beaumont, W., Binet, S., Bolognino, I., Borg, J., Buridon, V., Chanal, H., Coupé, B., Crochet, P., Cussans, D., Roeck, A., Durand, D., Fallot, M., Galbinski, D., Gallego, S., Giot, L., Guillon, B., Henaff, D., Hayashida, S., Hosseini, B., Kalcheva, S., Lehaut, G., Michiels, I., Monteil, S., Newbold, D., Roy, N., Ryckbosch, D., Sfar, H. Rejeb, Simard, L., Vacheret, A., Vandierendonck, G., Dyck, S., Remortel, N., Vercaemer, S., Verstraeten, M., Weber, A., Yeresko, M., Bonhomme, A., Buck, C., Del Amo Sanchez, P., El Atmani, I., Labit, L., Letourneau, A., Lhuillier, D., Licciardi, M., Materna, T., Pessard, H., Rogly, R., Savu, V., Schoppmann, S., Vialat, M., Algora, A., Beloeuvre, A., Estienne, M., Kean, R., Porta, A., Tain, J. L., Sidelnik, I., Anderson, T., Askins, M., Bagdasarian, Z., Baldoni, A., Barna, A., Benson, T., Bergevin, M., Bernstein, A., Birrittella, B., Bogetic, S., Boissevain, J., Borusinki, J., Boyd, S., Brooks, T., Budsworth, Mat, Burns, J., Calle, M., Camilo, C., Carroll, A., Coleman, J., Collins, R., Connor, C., Cowen, D., Crow, B., Curry, J., Dalnoki-Veress, F., Danielson, D., Diwan, M., Dixon, S., Drakopoulou, L., Duron, J., Dye, S., Fargher, S., Fienberg, A., Fischer, V., Foster, R., Frankiewicz, Kat, Gamble, T., Gooding, D., Gokhale, S., Gregorio, R., Gribble, J., Griskevich, J., Hadley, D., He, J., Healey, K., Hecla, J., Holt, G., Jabbari, C., Jewkes, K., Kaiser, R., Keenan, M., Keener, P., Kneale, Liz, Kudryavtsev, V., Kunkle, P., Litchfield, P., Liu, X. Ran, Lynch, G., Malek, M., Marr-Laundrie, P., Masic, B., Mauger, C., Mccauley, N., Metelko, C., Mills, R., Mitra, A., Muheim, F., Mullen, A., Murphy, A., Needham, M., Neights, E., Ogren, K., Orebi Gann, G., Oxborough, L., Paling, S., Papatyi, A., Paulos, B., Pershing, T., Pickard, L., Quillin, S., Resoro, R., Richards, B., Sabarots, L., Scarff, A., Schnellbach, Yan-Jie, Scovell, P., Seitz, B., Shea, O., Shebalin, V., Smith, G., Smy, M., Song, H., Spooner, N., Stanton, C., Stone, O., Svoboda, R., Szoldos, S., Thompson, L., Thomson, F., Toth, C., Vagins, M., Berg, Rick, Ventura, S., Walsh, B., Webster, J., Weiss, M., Westphal, D., Wetstein, M., Wilson, T., Wilson, S., Wolcott, S., Wright, M., Berryman, J. M., Collar, J. I., Erlandson, A., Gariazzo, S., Garzelli, M. V., Giunti, C., Goldblum, B. L., Hayes, A., Hedges, S., Mariani, C., Minic, D., Mougeot, X., Naim, D., Newby, J., Ni, K., O Donnell, T., Ozturk, S., Périssé, L., Pestes, R., Sonzogni, A. 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
Subjects: 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

33. Interpreting Reactor Antineutrino Anomalies with STEREO data

Author: Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Chalil, A., Sanchez, P. del Amo, Atmani, I. El, Labit, L., Lhuillier, J. Lamblin A. Letourneau 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., and Vialat, M.
Subjects: High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics - Experiment
Abstract: 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., 21 pages, 13 figures
Published: 2022

34. Search for sub-GeV dark matter via the Migdal effect with an EDELWEISS germanium detector with NbSi transition-edge sensors

Author: Armengaud, E., Arnaud, Q., Augier, C., Benoît, A., Bergé, L., Billard, J., Broniatowski, A., Camus, P., Caze, A., Chapellier, M., Charlieux, F., de Jésus, M., Dumoulin, L., Eitel, K., Filippini, J.B., Filosofov, D., Gascon, J., Giuliani, A., Gros, M., Guy, E., Jin, Y., Juillard, A., Kleifges, M., Lattaud, H., Marnieros, S., Misiak, D., Navick, X.F., Nones, C., Olivieri, E., Oriol, C., Pari, P., Paul, B., Poda, D., Rozov, S., Salagnac, T., Sanglard, V., Vagneron, L., Yakushev, E., Zolotarova, A., Kavanagh, B.J., Agence Nationale de la Recherche (France), Université de Lyon, Russian Foundation for Basic Research, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), European Research Council, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut 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), Hélium : du fondamental aux applications (NEEL - HELFA), 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), 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), Cryogénie (NEEL - Cryo), Centre de Nanosciences et de Nanotechnologies [Orsay] (C2N), Université Paris-Sud - Paris 11 (UP11)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Cryogénie (LC), Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), and EDELWEISS
Subjects: background, resolution, GeV, sensitivity, dark matter, particle: interaction, thermal, EDELWEISS, cryogenics, electron: recoil: energy, ionization, germanium: detector, phonon, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract: The EDELWEISS collaboration reports on the search for dark matter particle interactions via Migdal effect with masses between 32MeV⋅c−2 to 2 GeV⋅c−2 using a 200 g cryogenic Ge detector sensitive to simultaneously heat and ionization signals and operated underground at the Laboratoire Souterrain de Modane in France. The phonon signal was read out using a transition edge sensor made of a NbSi thin film. The detector was biased at 66 V in order to benefit from the Neganov-Trofimov-Luke amplification and resulting in a resolution on the energy of electron recoils of 4.46eVee (102.58 eV at 66 V) and an analysis threshold of 30eVee. The sensitivity is limited by a dominant background not associated to charge creation in the detector. The search constrains a new region of parameter space for cross sections down to 10−29cm2 and masses between 32 and 100MeV⋅c−2. The achieved low threshold with the NbSi sensor shows the relevance of its use for out-of-equilibrium phonon sensitive devices for low-mass dark matter searches., The EDELWEISS project is supported in part by the French Agence Nationale pour la Recherche (ANR) and the LabEx Lyon Institute of Origins (ANR-10-LABX0066) of the Universite de Lyon within the program “Investissements d’Avenir” (ANR-11-IDEX-00007), by the P2IO LabEx(ANR-10-LABX-0038)inthe framework “Investissements d’Avenir” (ANR-11-IDEX-0003-01) managed by the ANR (France), and the Russian Foundation for Basic Research (Grant No. 18-0200159). This project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant Agreement No. 838537. B.J.K. thanks the Spanish Agencia Estatal de Investigación (AEI, MICIU) for the support to the Unidad de Excelencia María de Maeztu Instituto de Física de Cantabria, Ref. MDM-2017-0765.
Published: 2022

35. Development of Data Processing and Analysis Pipeline for the Ricochet Experiment.

Author: Colas, J., Billard, J., Ferriol, S., Gascon, J., and Salagnac, T.
Subjects: ELECTRONIC data processing, AMPLITUDE estimation, NEUTRINO scattering, DATA analysis, NUCLEAR reactors, PERCENTILES
Abstract: Achieving a percentage-level precision measurement of the coherent elastic neutrino nucleus scattering (CE ν NS) spectrum requires a robust data processing pipeline which can be characterised with great precision. To fulfil this goal, we present hereafter a new Python-based data processing pipeline specifically designed for temporal data analysis and pulse amplitude estimation. This pipeline features a data generator allowing to accurately simulate the expected data stream from the Ricochet experiment at the Institut Laue Langevin nuclear reactor, including both background and CE ν NS signals. This data generator is pivotal to fully understand and characterise the data processing overall efficiency, its reconstruction biases, and to properly optimise its configuration parameters. We show that thanks to this optimised data processing pipeline, the CryoCube detector array will be able to achieve a 70 eV energy threshold combined with electronic/nuclear recoil discrimination down to ∼ 100 eV, hence fulfilling the Ricochet targeted performance. [ABSTRACT FROM AUTHOR]
Published: 2023
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36. EXCESS workshop: Descriptions of rising low-energy spectra

Author: Adari, Prakruth, primary, Aguilar-Arevalo, Alexis A., additional, Amidei, Dante, additional, Angloher, G., additional, Armengaud, Eric, additional, Augier, C., additional, Balogh, Levente, additional, Banik, S., additional, Baxter, David, additional, Beaufort, C., additional, Beaulieu, G., additional, Belov, V., additional, Ben Gal, Y., additional, Benato, Giovanni, additional, Benoît, Alain, additional, Bento, Antonio, additional, Bergé, Laurent, additional, Bertolini, Andrea, additional, Bhattacharyya, R., additional, Billard, J., additional, Bloch, Itay M., additional, Botti, A., additional, Breier, Robert, additional, Bres, G., additional, Bret, J-.L., additional, Broniatowski, A., additional, Brossard, Alexis, additional, Bucci, Carlo, additional, Bunker, Raymond, additional, Cababie, M., additional, Calvo, M., additional, Camus, P., additional, Cancelo, G., additional, Canonica, Lucia, additional, Cappella, Fabio, additional, Cardani, Laura, additional, Caron, Jean-François, additional, Casali, N., additional, del Castello, G., additional, Cazes, Aurélie, additional, Cerulli, Riccardo, additional, Cervantes Vergara, B.A., additional, Chaize, D., additional, Chapellier, M., additional, Chaplinsky, L., additional, Charlieux, F., additional, Chaudhuri, M., additional, Chavarria, Alvaro E., additional, Chemin, G., additional, Chen, Ran, additional, Chen, Hao, additional, Chierchie, F., additional, Colantoni, I., additional, Colas, J., additional, Cooley, Jodi, additional, Coquillat, Jean-Marie, additional, Corcoran, Emily, additional, Crawford, S., additional, Crisler, Michael, additional, Cruciani, Angelo, additional, Cushman, Priscilla, additional, D'Addabbo, Antonio, additional, D'Olivo, Juan Carlos, additional, Dastgheibi-Fard, A., additional, De Jésus, Maria, additional, Deng, Y., additional, Dent, James, additional, Depaoli, Eliana, additional, Dering, Koby, additional, Dharani, Sukeerthi, additional, Di Lorenzo, S., additional, Drlica-Wagner, Alex, additional, Dumoulin, Louis, additional, Durnford, Daniel, additional, Dutta, Bhaskar, additional, Einfalt, L., additional, Erb, Anna, additional, Erhart, A., additional, Essig, Rouven, additional, Estrada, Juan, additional, Etzion, Erez, additional, Exshaw, O., additional, Favela-Perez, F., additional, von Feilitzsch, F., additional, Fernandez Moroni, Guillermo, additional, Ferreiro Iachellini, Nahuel, additional, Ferriol, S., additional, Fichtinger, S., additional, Figueroa-Feliciano, Enectalí, additional, Filippini, J.-B., additional, Filosofov, Dmitry, additional, Formaggio, Joseph A., additional, Friedl, Markus, additional, Fuard, S., additional, Fuchs, Dominik, additional, Fuss, Alexander, additional, Gaïor, R., additional, Garai, Abhijit, additional, Garrah, Carter, additional, Gascon, J., additional, Gerbier, Gilles, additional, Ghaith, Muad, additional, Ghete, V. M., additional, Gift, Daniel, additional, Giomataris, I., additional, Giroux, Guillaume, additional, Giuliani, A., additional, Gorel, Pierre, additional, Gorla, Paolo, additional, Goupy, C., additional, Goupy, J., additional, Goy, C., additional, Gros, M., additional, Gros, Philippe, additional, Guardincerri, Yann, additional, Guerin, C., additional, Guidi, Vincenzo, additional, Guillaudin, O., additional, Gupta, S., additional, Guy, E., additional, Harrington, Patrick, additional, Hauff, D., additional, Heine, S. T., additional, Hertel, Scott A., additional, Holland, Stephen, additional, Hong, Z., additional, Hoppe, Eric W., additional, Hossbach, Todd W., additional, Ianigro, J.-C., additional, Iyer, Vivek, additional, Jastram, Andrew, additional, Ješkovský, Miroslav, additional, Jin, Y., additional, Jochum, Josef, additional, Johnston, J. P., additional, Juillard, A., additional, Karaivanov, Dimitar, additional, Kashyap, V., additional, Katsioulas, Ioannis, additional, Kazarcev, S., additional, Kaznacheeva, Margarita, additional, Kelly, Fiona, additional, Kilminster, B., additional, Kinast, Angelina, additional, Klinkenberg, L., additional, Kluck, Holger, additional, Knights, Patrick, additional, Korn, Yaron, additional, Kraus, Hans, additional, von Krosigk, Belina, additional, Kubik, Andrew, additional, Kurinsky, Noah, additional, Lamblin, Jacob, additional, Langenkämper, Alexander, additional, Langrock, S., additional, Lasserre, Thierry, additional, Lattaud, H., additional, Lautridou, P., additional, Lawson, Ian, additional, Lee, S.-J., additional, Lee, M., additional, Letessier-Selvon, Antoine, additional, Lhuillier, D., additional, Li, M., additional, Lin, Y.-T., additional, Lubashevskiy, Alexey, additional, Mahaparta, Rupak, additional, Maludze, Sandro, additional, Mancuso, Michele, additional, Manthos, Ioannis, additional, Marini, Laura, additional, Marnieros, S., additional, Martin, Ryan D., additional, Matalon, Ariel, additional, Matthews, J., additional, Mauri, B., additional, Mayer, D. W., additional, Mazzolari, Andrea, additional, Mazzucato, E., additional, Meyer zu Theenhausen, Hanno, additional, Michielin, E., additional, Minet, J., additional, Mirabolfathi, Nader, additional, v. Mirbach, K., additional, Misiak, Dimitri, additional, Mitra, P., additional, Mocellin, J.-L., additional, Mohanty, Bedangadas, additional, Mokina, Valentyna, additional, Mols, J.-P., additional, Monfardini, Alessandro, additional, Mounier, F., additional, Munagavalasa, Sravan, additional, Muraz, Jean-François, additional, Navick, X.-F., additional, Neep, Thomas, additional, Neog, Himangshu, additional, Neyrial, H., additional, Nikolopoulos, Kostas, additional, Nilima, Athoy, additional, Nones, C., additional, Novati, Valentina, additional, O'Brien, Paul, additional, Oberauer, L., additional, Olivieri, E., additional, Olmi, Alessandro, additional, Onillon, A., additional, Oriol, C., additional, Orly, A., additional, Orrell, John L., additional, Ortmann, T., additional, Overman, C. T., additional, Pagliarone, Carmine Elvezio, additional, Palušová, Veronika, additional, Pari, P., additional, Patel, P. K., additional, Pattavina, Luca, additional, Petricca, Federica, additional, Piers, Alexander, additional, Pinckney, Harold D., additional, Piro, Marie-Cécile, additional, Platt, Mark, additional, Poda, D., additional, Ponomarev, Dmitry, additional, Potzel, Walter, additional, Povinec, Pavel, additional, Pröbst, F., additional, Privitera, P., additional, Pucci, F., additional, Ramanathan, K., additional, Real, J.-S., additional, Redon, T., additional, Reindl, Florian, additional, Ren, R., additional, Robert, Adeline, additional, Da Rocha, Julia, additional, Rodrigues, D., additional, Rogly, R., additional, Rothe, Johannes, additional, Rowe, Noah, additional, Rozov, Sergey, additional, Rozova, I., additional, Saab, Tarek, additional, Saffold, Nathan, additional, Salagnac, T., additional, Sander, Joel, additional, Sanglard, Veronique, additional, Santos, D., additional, Sarkis, Youssef, additional, Savu, V., additional, Savvidis, G., additional, Savvidis, I., additional, Schönert, S., additional, Schäffner, Karoline, additional, Schermer, Nicole, additional, Schieck, Jochen, additional, Schmidt, Benjamin, additional, Schmiedmayer, D., additional, Schwertner, C., additional, Scola, L., additional, Settimo, Mariangela, additional, Shevchik, Ye., additional, Sibille, Valérian, additional, Sidelnik, Ivan, additional, Singal, Aman, additional, Smida, Radomir, additional, Sofo Haro, Miguel, additional, Soldner, Torsten, additional, Stachurska, Juliana, additional, Stahlberg, Martin, additional, Stefanazzi, Leandro, additional, Stodolsky, Leo, additional, Strandhagen, Christian, additional, Strauss, R., additional, Stutz, A., additional, Thomas, R., additional, Thompson, A., additional, Tiffenberg, Javier, additional, Tomei, Claudia, additional, Traina, M., additional, Uemura, Sho, additional, Usherov, I., additional, Vagneron, L., additional, Van De Pontseele, Wouter, additional, Vázquez de Sola Fernández, Francisco Andrés, additional, Vidal, M., additional, Vignati, M., additional, Virto, A. L., additional, Vivier, M., additional, Volansky, Tomer, additional, Wagner, V., additional, Wagner, Felix, additional, Walker, Joel, additional, Ward, R., additional, Watkins, Samuel L., additional, Wex, A., additional, Willers, Michael, additional, Wilson, M. J., additional, Winslow, Lindley, additional, Yakushev, Evgeny, additional, Yu, T.-T., additional, Zampaolo, M., additional, Zaytsev, Alexander, additional, Zema, Vanessa, additional, Zinatulina, Daniya, additional, and Zolotarova, A., additional
Published: 2022
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37. Searching for Hidden Neutrons with a Reactor Neutrino Experiment: Constraints from the STEREO Experiment

Author: 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
Published: 2022
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38. Sub-MeV Dark Matter Searches with EDELWEISS: results and prospects

Author: Lattaud, Hugues, primary, Armengaud, E., additional, Arnaud, Q., additional, Augier, C., additional, Benoit, A., additional, Bergé, L., additional, Billard, J., additional, Broniatowski, A., additional, Camus, P., additional, Cazes, A., additional, Chapellier, M., additional, Charlieux, F., additional, De.Jesus, M., additional, Dumoulin, L., additional, Eitel, K., additional, Fillipini, J.-B., additional, Filosofov, D., additional, Gascon, J., additional, Giuliani, A., additional, Gros, M., additional, Jin, Y., additional, Juillard, A., additional, Kleifges, M., additional, Marnieros, S., additional, Misiak, D., additional, Navick, X.-F., additional, Nones, C., additional, Olivieri, E., additional, Oriol, C., additional, Pari, P., additional, Paul, B., additional, Poda, D., additional, Rozov, S., additional, Salagnac, T., additional, Sanglard, V., additional, Siebenborn, B., additional, Vagneron, L., additional, Weber, M., additional, Yakushev, E., additional, and Zolotarova, A., additional
Published: 2022
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39. 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

Author: 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.
Published: 2020

40. EXCESS workshop: Descriptions of rising low-energy spectra

Author: Fuss, A., Kaznacheeva, M., Reindl, F., Wagner, F., Adari, Prakruth, Aguilar-Arevalo, Alexis A., Amidei, Dante, Angloher, G., Armengaud, Eric, Augier, C., Balogh, Levente, Banik, S., Baxter, David, Beaufort, C., Beaulieu, G., Belov, V., Gal, Y. Ben, Benato, Giovanni, Benoît, Alain, Bento, Antonio, Bergé, Laurent, Bertolini, Andrea, Bhattacharyya, R., Billard, J., Bloch, Itay M., Botti, A., Breier, Robert, Bres, G., Bret, J-.L., Broniatowski, A., Brossard, Alexis, Bucci, Carlo, Bunker, Raymond, Cababie, M., Calvo, M., Camus, P., Cancelo, G., Canonica, Lucia, Cappella, Fabio, Cardani, Laura, Caron, Jean-François, Casali, N., del Castello, G., Cazes, Aurélie, Cerulli, Riccardo, Vergara, B.A. Cervantes, Chaize, D., Chapellier, M., Chaplinsky, L., Charlieux, F., Chaudhuri, M., Chavarria, Alvaro E., Chemin, G., Chen, Ran, Chen, Hao, Chierchie, F., Colantoni, I., Colas, J., Cooley, Jodi, Coquillat, Jean-Marie, Corcoran, Emily, Crawford, S., Crisler, Michael, Cruciani, Angelo, Cushman, Priscilla, d'Addabbo, Antonio, d'Olivo, Juan Carlos, Dastgheibi-Fard, A., Jésus, Maria De, Deng, Y., Dent, James, Depaoli, Eliana, Dering, Koby, Dharani, Sukeerthi, Di Lorenzo, S., Drlica-Wagner, Alex, Dumoulin, Louis, Durnford, Daniel, Dutta, Bhaskar, Einfalt, L., Erb, Anna, Erhart, A., Essig, Rouven, Estrada, Juan, Etzion, Erez, Exshaw, O., Favela-Perez, F., von Feilitzsch, F., Moroni, Guillermo Fernandez, Iachellini, Nahuel Ferreiro, Ferriol, S., Fichtinger, S., Figueroa-Feliciano, Enectalí, Filippini, J.-B., Filosofov, Dmitry, Formaggio, Joseph A., Friedl, Markus, Fuard, S., Fuchs, Dominik, Gaïor, R., Garai, Abhijit, Garrah, Carter, Gascon, J., Gerbier, Gilles, Ghaith, Muad, Ghete, V.M., Gift, Daniel, Giomataris, I., Giroux, Guillaume, Giuliani, A., Gorel, Pierre, Gorla, Paolo, Goupy, C., Goupy, J., Goy, C., Gros, M., Gros, Philippe, Guardincerri, Yann, Guerin, C., Guidi, Vincenzo, Guillaudin, O., Gupta, S., Guy, E., Harrington, Patrick, Hauff, D., Heine, S.T., Hertel, Scott A., Holland, Stephen, Hong, Z., Hoppe, Eric W., Hossbach, Todd W., Ianigro, J.-C., Iyer, Vivek, Jastram, Andrew, Ješkovský, Miroslav, Jin, Y., Jochum, Josef, Johnston, J.P., Juillard, A., Karaivanov, Dimitar, Kashyap, V., Katsioulas, Ioannis, Kazarcev, S., Kelly, Fiona, Kilminster, B., Kinast, Angelina, Klinkenberg, L., Kluck, Holger, Knights, Patrick, Korn, Yaron, Kraus, Hans, von Krosigk, Belina, Kubik, Andrew, Kurinsky, N.A., Lamblin, Jacob, Langenkämper, Alexander, Langrock, S., Lasserre, Thierry, Lattaud, H., Lautridou, P., Lawson, Ian, Lee, S.J., Lee, M., Letessier-Selvon, Antoine, Lhuillier, D., Li, M., Lin, Y.-T., Lubashevskiy, Alexey, Mahaparta, Rupak, Mahapatra, R., Maludze, Sandro, Mancuso, Michele, Manthos, Ioannis, Marini, Laura, Marnieros, S., Martin, Ryan D., Matalon, Ariel, Matthews, J., Mauri, B., Mayer, D.W., Mazzolari, Andrea, Mazzucato, E., Theenhausen, Hanno Meyer Zu, Michielin, E., Minet, J., Mirabolfathi, Nader, Mirbach, K. V., Misiak, Dimitri, Mitra, P., Mocellin, J-.L., Mohanty, Bedangadas, Mokina, Valentyna, Mols, J.-P., Monfardini, Alessandro, Mounier, F., Munagavalasa, Sravan, Muraz, Jean-François, Navick, X.-F., Neep, Thomas, Neog, Himangshu, Neyrial, H., Nikolopoulos, Kostas, Nilima, Athoy, Nones, C., Novati, Valentina, O'Brien, Paul, Oberauer, L., Olivieri, E., Olmi, Alessandro, Olmi, M., Onillon, A., Oriol, C., Orly, A., Orrell, John L., Ortmann, T., Overman, C.T., Pagliarone, Carmine Elvezio, Palušová, Veronika, Pari, P., Patel, P.K., Pattavina, Luca, Petricca, Federica, Piers, Alexander, Pinckney, Harold D., Piro, Marie-Cécile, Platt, Mark, Poda, D., Ponomarev, Dmitry, Potzel, Walter, Povinec, Pavel, Pröbst, F., Privitera, P., Pucci, F., Ramanathan, K., Real, J.-S., Redon, T., Ren, R., Robert, Adeline, Rocha, Julia Da, Rodrigues, D., Rogly, R., Rothe, Johannes, Rowe, Noah, Rozov, Sergey, Rozova, I., Saab, Tarek, Saffold, Nathan, Salagnac, T., Sander, Joel, Sanglard, Veronique, Santos, D., Sarkis, Youssef, Savu, V., Savvidis, G., Savvidis, I., Schönert, S., Schäffner, Karoline, Schermer, Nicole, Schieck, Jochen, Schmidt, Benjamin, Schmiedmayer, D., Schwertner, C., Scola, L., Settimo, Mariangela, Shevchik, Ye., Sibille, Valérian, Sidelnik, Ivan, Singal, Aman, Smida, Radomir, Haro, Miguel Sofo, Soldner, Torsten, Stachurska, Juliana, Stahlberg, Martin, Stefanazzi, Leandro, Stodolsky, Leo, Strandhagen, Christian, Strauss, R., Stutz, A., Thomas, R., Thompson, A., Tiffenberg, Javier, Tomei, Claudia, Traina, M., Uemura, Sho, Usherov, I., Vagneron, L., Pontseele, Wouter van De, de Sola Fernández, Francisco Andrés Vázquez, Vidal, M., Vignati, M., Virto, A.L., Vivier, M., Volansky, Tomer, Wagner, V., Walker, Joel, Ward, R., Watkins, Samuel L., Wex, A., Willers, Michael, Wilson, M.J., Winslow, Lindley, Yakushev, Evgeny, Yu, T.-T., Zampaolo, M., Zaytsev, Alexander, Zema, Vanessa, Zinatulina, Daniya, Zolotarova, A., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut 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 ), Université Grenoble Alpes (UGA), Hélium : du fondamental aux applications (NEEL - HELFA), 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 ), 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), Electronique (NEEL - ElecLab), Cryogénie (NEEL - Cryo), Institut Laue-Langevin (ILL), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Centre de Nanosciences et de Nanotechnologies [Orsay] (C2N), Université Paris-Sud - Paris 11 (UP11)-Université Paris-Saclay-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)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), 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), and Institut Rayonnement Matière de Saclay (IRAMIS)
Subjects: CDMS, Physics - Instrumentation and Detectors, background, collective, energy spectrum, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), DAMIC, sensitivity, dark matter, EDELWEISS, CRESST, CONNIE, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM)
Abstract: Many low-threshold experiments observe sharply rising event rates of yet unknown origins below a few hundred eV, and larger than expected from known backgrounds. Due to the significant impact of this excess on the dark matter or neutrino sensitivity of these experiments, a collective effort has been started to share the knowledge about the individual observations. For this, the EXCESS Workshop was initiated. In its first iteration in June 2021, ten rare event search collaborations contributed to this initiative via talks and discussions. The contributing collaborations were CONNIE, CRESST, DAMIC, EDELWEISS, MINER, NEWS-G, NUCLEUS, RICOCHET, SENSEI and SuperCDMS. They presented data about their observed energy spectra and known backgrounds together with details about the respective measurements. In this paper, we summarize the presented information and give a comprehensive overview of the similarities and differences between the distinct measurements. The provided data is furthermore publicly available on the workshop's data repository together with a plotting tool for visualization., 44 pages, 20 figures; Editors: A. Fuss, M. Kaznacheeva, F. Reindl, F. Wagner; updated copyright statements and funding information
Published: 2021

41. First antineutrino energy spectrum from $^{235}$U fissions with the STEREO detector at ILL

Author: STEREO collaboration, Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Sanchez, P. del Amo, Atmani, I. El, 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., Sergeyeva, V., 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), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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 de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), 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 de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-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), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Institut Laue-Langevin (ILL), ILL, STEREO, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), 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), 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: Nuclear and High Energy Physics, data analysis method, Physics - Instrumentation and Detectors, FOS: Physical sciences, antineutrino/e: energy spectrum, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, symbols.namesake, High Energy Physics - Experiment (hep-ex), Distortion, 0103 physical sciences, Gaussian function, antineutrino: nuclear reactor, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, uranium: fission, Physics, antineutrino: spectrum, 235U spectrum shape, 010308 nuclear & particles physics, Spectrum (functional analysis), Detector, antineutrino/e: energy, Instrumentation and Detectors (physics.ins-det), antineutrino, Amplitude, unfolded spectrum, Yield (chemistry), symbols, STEREO, Energy (signal processing), Nominal power (photovoltaic), experimental results, 5 MeV exess
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 pure $^{235}$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 $E_\nu \simeq 5.3$ MeV. A gaussian fit of this local excess leads to an amplitude of $A = 12.1 \pm 3.4\%$ (3.5$\sigma$)., Comment: This is the Accepted Manuscript version of an article accepted for publication in J. Phys. G: Nucl. Part. Phys.. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6471/abd37a. 34 pages, 14 figures
Published: 2021

42. First antineutrino energy spectrum from 235U fissions with the STEREO detector at ILL *

Author: 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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43. Sterile Neutrino Constraints from the STEREO Experiment with 66 Days of Reactor-On Data

Author: Almazan, H, Sanchez, P, Bernard, L, Blanchet, A, Bonhomme, A, Buck, C, Favier, J, Haser, J, Helaine, V, Kandzia, F, Kox, S, Lamblin, J, Letourneau, A, Lhuillier, D, Lindner, M, Manzanillas, L, Materna, T, Minotti, A, Montanet, F, Pessard, H, Real, J, Roca, C, Salagnac, T, Schoppmann, S, Sergeyeva, V, Soldner, T, Stutz, A, Zsoldos, S, Almazan H., Sanchez P. D. A., Bernard L., Blanchet A., Bonhomme A., Buck C., Favier J., Haser J., Helaine V., Kandzia F., Kox S., Lamblin J., Letourneau A., Lhuillier D., Lindner M., Manzanillas L., Materna T., Minotti A., Montanet F., Pessard H., Real J. -S., Roca C., Salagnac T., Schoppmann S., Sergeyeva V., Soldner T., Stutz A., Zsoldos S., Almazan, H, Sanchez, P, Bernard, L, Blanchet, A, Bonhomme, A, Buck, C, Favier, J, Haser, J, Helaine, V, Kandzia, F, Kox, S, Lamblin, J, Letourneau, A, Lhuillier, D, Lindner, M, Manzanillas, L, Materna, T, Minotti, A, Montanet, F, Pessard, H, Real, J, Roca, C, Salagnac, T, Schoppmann, S, Sergeyeva, V, Soldner, T, Stutz, A, Zsoldos, S, Almazan H., Sanchez P. D. A., Bernard L., Blanchet A., Bonhomme A., Buck C., Favier J., Haser J., Helaine V., Kandzia F., Kox S., Lamblin J., Letourneau A., Lhuillier D., Lindner M., Manzanillas L., Materna T., Minotti A., Montanet F., Pessard H., Real J. -S., Roca C., Salagnac T., Schoppmann S., Sergeyeva V., Soldner T., Stutz A., and Zsoldos S.
Abstract: The reactor antineutrino anomaly might be explained by the oscillation of reactor antineutrinos toward a sterile neutrino of eV mass. In order to explore this hypothesis, the STEREO experiment measures the antineutrino energy spectrum in six different detector cells covering baselines between 9 and 11 m from the compact core of the ILL research reactor. In this Letter, results from 66 days of reactor turned on and 138 days of reactor turned off are reported. A novel method to extract the antineutrino rates has been developed based on the distribution of the pulse shape discrimination parameter. The test of a new oscillation toward a sterile neutrino is performed by comparing ratios of cells, independent of absolute normalization and of the prediction of the reactor spectrum. The results are found to be compatible with the null oscillation hypothesis and the best fit of the reactor antineutrino anomaly is excluded at 97.5% C.L.
Published: 2018

44. The STEREO experiment

Author: Allemandou, N, Almazan, H, Sanchez, P, Bernard, L, Bernard, C, Blanchet, A, Bonhomme, A, Bosson, G, Bourrion, O, Bouvier, J, Buck, C, Caillot, V, Chala, M, Champion, P, Charon, P, Collin, A, Contrepois, P, Coulloux, G, Desbrieres, B, Deleglise, G, Kanawati, W, Favier, J, Fuard, S, Monteiro, I, Gramlich, B, Haser, J, Helaine, V, Heusch, M, Jentschel, M, Kandzia, F, Konrad, G, Koster, U, Kox, S, Lahonde-Hamdoun, C, Lamblin, J, Letourneau, A, Lhuillier, D, Li, C, Lindner, M, Manzanillas, L, Materna, T, Meplan, O, Minotti, A, Monon, C, Montanet, F, Nunio, F, Peltier, F, Penichot, Y, Pequignot, M, Pessard, H, Piret, Y, Prono, G, Quemener, G, Real, J, Roca, C, Salagnac, T, Sergeyeva, V, Schoppmann, S, Scola, L, Scordilis, J, Soldner, T, Stutz, A, Tourres, D, Vescovi, C, Zsoldos, S, Allemandou N., Almazan H., Sanchez P. D. A., Bernard L., Bernard C., Blanchet A., Bonhomme A., Bosson G., Bourrion O., Bouvier J., Buck C., Caillot V., Chala M., Champion P., Charon P., Collin A., Contrepois P., Coulloux G., Desbrieres B., Deleglise G., Kanawati W. El., Favier J., Fuard S., Monteiro I. G., Gramlich B., Haser J., Helaine V., Heusch M., Jentschel M., Kandzia F., Konrad G., Koster U., Kox S., Lahonde-Hamdoun C., Lamblin J., Letourneau A., Lhuillier D., Li C., Lindner M., Manzanillas L., Materna T., Meplan O., Minotti A., Monon C., Montanet F., Nunio F., Peltier F., Penichot Y., Pequignot M., Pessard H., Piret Y., Prono G., Quemener G., Real J. -S., Roca C., Salagnac T., Sergeyeva V., Schoppmann S., Scola L., Scordilis J. -P., Soldner T., Stutz A., Tourres D., Vescovi C., Zsoldos S., Allemandou, N, Almazan, H, Sanchez, P, Bernard, L, Bernard, C, Blanchet, A, Bonhomme, A, Bosson, G, Bourrion, O, Bouvier, J, Buck, C, Caillot, V, Chala, M, Champion, P, Charon, P, Collin, A, Contrepois, P, Coulloux, G, Desbrieres, B, Deleglise, G, Kanawati, W, Favier, J, Fuard, S, Monteiro, I, Gramlich, B, Haser, J, Helaine, V, Heusch, M, Jentschel, M, Kandzia, F, Konrad, G, Koster, U, Kox, S, Lahonde-Hamdoun, C, Lamblin, J, Letourneau, A, Lhuillier, D, Li, C, Lindner, M, Manzanillas, L, Materna, T, Meplan, O, Minotti, A, Monon, C, Montanet, F, Nunio, F, Peltier, F, Penichot, Y, Pequignot, M, Pessard, H, Piret, Y, Prono, G, Quemener, G, Real, J, Roca, C, Salagnac, T, Sergeyeva, V, Schoppmann, S, Scola, L, Scordilis, J, Soldner, T, Stutz, A, Tourres, D, Vescovi, C, Zsoldos, S, Allemandou N., Almazan H., Sanchez P. D. A., Bernard L., Bernard C., Blanchet A., Bonhomme A., Bosson G., Bourrion O., Bouvier J., Buck C., Caillot V., Chala M., Champion P., Charon P., Collin A., Contrepois P., Coulloux G., Desbrieres B., Deleglise G., Kanawati W. El., Favier J., Fuard S., Monteiro I. G., Gramlich B., Haser J., Helaine V., Heusch M., Jentschel M., Kandzia F., Konrad G., Koster U., Kox S., Lahonde-Hamdoun C., Lamblin J., Letourneau A., Lhuillier D., Li C., Lindner M., Manzanillas L., Materna T., Meplan O., Minotti A., Monon C., Montanet F., Nunio F., Peltier F., Penichot Y., Pequignot M., Pessard H., Piret Y., Prono G., Quemener G., Real J. -S., Roca C., Salagnac T., Sergeyeva V., Schoppmann S., Scola L., Scordilis J. -P., Soldner T., Stutz A., Tourres D., Vescovi C., and Zsoldos S.
Abstract: The STEREO experiment is a very short baseline reactor antineutrino experiment aiming at testing the hypothesis of light sterile neutrinos as an explanation of the deficit of the observed neutrino interaction rate with respect to the predicted rate, known as the Reactor Antineutrino Anomaly. The detector center is located 10 m away from the compact, highly 235U enriched core of the research nuclear reactor of the Institut Laue Langevin in Grenoble, France. This paper describes the STEREO site, the detector components and associated shielding designed to suppress the external sources of background which were characterized on site. It reports the performances in terms of detector response and energy reconstruction.
Published: 2018

45. Accurate Measurement of the Electron Antineutrino Yield of <math><mrow><mmultiscripts><mrow><mi>U</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>235</mn></mrow></mmultiscripts></mrow></math> Fissions from the STEREO Experiment with 119 Days of Reactor-On Data

Author: Almazán, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Sanchez, P. del Amo, Atmani, I. El, Haser, J., Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Materna, T., Minotti, A., Onillon, A., Pessard, H., Réal, J.S., Roca, C., Rogly, R., Salagnac, T., Savu, V., Schoppmann, S., Sergeyeva, V., Soldner, T., Stutz, A., and Vialat, M.
Abstract: We report a measurement of the antineutrino rate from the fission of U235 with the STEREO detector using 119 days of reactor turned on. In our analysis, we perform several detailed corrections and achieve the most precise single measurement at reactors with highly enriched U235 fuel. We measure an IBD cross section per fission of σf=(6.34±0.06[stat]±0.15[sys]±0.15[model])×10−43 cm2/fission and observe a rate deficit of (5.2±0.8[stat]±2.3[sys]±2.3[model])% compared to the model, consistent with the deficit of the world average. Testing U235 as the sole source of the deficit, we find a tension between the results of lowly and highly enriched U235 fuel of 2.1 standard deviations.
Published: 2020

46. Improved sterile neutrino constraints from the STEREO experiment with 179 days of reactor-on data

Author: STEREO Collaboration, Almaz��n, H., Bernard, L., Blanchet, A., Bonhomme, A., Buck, C., Sanchez, P. del Amo, Atmani, I. El, Haser, J., Kandzia, F., Kox, S., Labit, L., Lamblin, J., Letourneau, A., Lhuillier, D., Licciardi, M., Lindner, M., Materna, T., Minotti, A., Pessard, H., R��al, J. -S., Roca, C., Rogly, R., Salagnac, T., Savu, V., Schoppmann, S., Sergeyeva, V., 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), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), ILL, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-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), Institut de Physique Nucléaire d'Orsay (IPNO), 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), STEREO, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), 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), 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), 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), and Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules)
Subjects: antineutrino: interaction, data analysis method, Sterile neutrino, Physics - Instrumentation and Detectors, FOS: Physical sciences, anomaly, Flux, model: optical, 01 natural sciences, Spectral line, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), statistical analysis, 0103 physical sciences, antineutrino: nuclear reactor, antineutrino nucleus: interaction, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Particle Physics Experiments, Neutron, Research reactor, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], n: capture, 010306 general physics, Physics, background, antineutrino: flux, 010308 nuclear & particles physics, Oscillation, Anomaly (natural sciences), Detector, technology, industry, and agriculture, Instrumentation and Detectors (physics.ins-det), antineutrino: energy spectrum, oscillation, neutrino: sterile, equipment and supplies, 3. Good health, flux, antineutrino: oscillation, Automatic Keywords, gadolinium, statistical, experimental results
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 gamma-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., Comment: 31 pages, 35 figures, for supplemental data see http://doi.org/10.17182/hepdata.92323
Published: 2020

47. First antineutrino energy spectrum from 235U fissions with the STEREO detector at ILL.

Author: 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 235U-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 pure 235U 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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48. The STEREO Experiment

Author: Allemandou , N., Almazán , H., Del Amo Sanchez , P., Bernard , L., Bernard , C., Blanchet , A., Bonhomme , A., Bosson , G., Bourrion , O., Bouvier , J., Buck , C., Caillot , V., Chala , M., Champion , P., Charon , P., Collin , A., Contrepois , P., Coulloux , G., Deleglise , G., El Kanawati , W., Favier , J., Fuard , S., Gomes Monteiro , I., Gramlich , B., Haser , J., Helaine , V., Heusch , M., Jentschel , M., Kandzia , F., Konrad , G., Köster , U., Kox , S., Lahonde-Hamdoun , C., Lamblin , J., Letourneau , A., Lhuillier , D., Li , C., Lindner , M., Manzanillas , L., Materna , T., Méplan , O., Minotti , A., Monon , C., Montanet , F., Nunio , F., Peltier , F., Penichot , Y., Pequignot , M., Pessard , H., Piret , Y., Prono , G., Quéméner , G., Real , J.-S., Roca , C., Salagnac , T., Sergeyeva , V., Schoppmann , S., Scola , L., Scordilis , J.-P., Soldner , T., Stutz , A., Tourres , D., Vescovi , C., Zsoldos , S., Laboratoire d'Annecy de Physique des Particules ( LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules ), 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 ), 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 ), Service des Réacteurs et de Mathématiques Appliquées ( SERMA ), Département de Modélisation des Systèmes et Structures ( DM2S ), 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 Laue-Langevin ( ILL ), ILL, Ecole Nationale Supérieure d'Ingénieurs de Caen ( ENSICAEN ), Normandie Université ( NU ), and STEREO
Subjects: neutrino: detector, Physics::Instrumentation and Detectors, shielding, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], antineutrino: nuclear reactor, High Energy Physics::Experiment, neutrino: sterile, [ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], detector: design, background: suppression, performance, activity report, Physics::Geophysics
Abstract: The STEREO experiment is a very short baseline reactor antineutrino experiment aiming at testing the hypothesis of light sterile neutrinos as an explanation of the deficit of the observed neutrino interaction rate with respect to the predicted rate, known as the Reactor Antineutrino Anomaly. The detector center is located 10 m away from the compact, highly $^{235}$U enriched core of the research nuclear reactor of the Institut Laue Langevin in Grenoble, France. This paper describes the STEREO site, the detector components and associated shielding designed to suppress the external sources of background which were characterized on site. It reports the performances in terms of detector response and energy reconstruction.
Published: 2018

49. Improved STEREO simulation with a new gamma ray spectrum of excited gadolinium isotopes using FIFRELIN

Author: Almazán, H., primary, Bernard, L., additional, Blanchet, A., additional, Bonhomme, A., additional, Buck, C., additional, Chebboubi, A., additional, del Amo Sanchez, P., additional, El Atmani, I., additional, Haser, J., additional, Kandzia, F., additional, Kox, S., additional, Labit, L., additional, Lamblin, J., additional, Letourneau, A., additional, Lhuillier, D., additional, Lindner, M., additional, Litaize, O., additional, Materna, T., additional, Minotti, A., additional, Pessard, H., additional, Réal, J. -S., additional, Roca, C., additional, Salagnac, T., additional, Savu, V., additional, Schoppmann, S., additional, Sergeyeva, V., additional, Soldner, T., additional, Stutz, A., additional, Thulliez, L., additional, and Vialat, M., additional
Published: 2019
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50. STEREO experiment : search for a sterile neutrino

Author: Salagnac, T., Vernay, Emmanuelle, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS), and STEREO
Subjects: [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2017

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