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1. Polarized cold-neutron reflectometry at JRR-3/MINE2 for the development of ultracold-neutron spin analyzers for a neutron EDM experiment at TRIUMF

Author

Higuchi, Takashi, Akatsuka, Hiroaki, Brossard, Alexis, Fujimoto, Derek, Giampa, Pietro, Hansen-Romu, Sean, Hatanaka, Kichiji, Hino, Masahiro, Ichikawa, Go, Imajo, Sohei, Jamieson, Blair, Kawasaki, Shinsuke, Kitaguchi, Masaaki, Mammei, Russell, Matsumiya, Ryohei, Mishima, Kenji, Picker, Rüdiger, Schreyer, Wolfgang, Shimizu, Hirohiko M., Sidhu, Steve, and Vanbergen, Sean

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The neutron electric dipole moment (EDM) is a sensitive probe for currently undiscovered sources of charge-parity symmetry violation. As part of the TRIUMF Ultracold Advanced Neutron (TUCAN) collaboration, we are developing spin analyzers for ultracold neutrons (UCNs) to be used for a next-generation experiment to measure the neutron EDM with unprecedented precision. Spin-state analysis of UCNs constitutes an essential part of the neutron EDM measurement sequence. Magnetized iron films used as spin filters of UCNs are crucial experimental components, whose performance directly influences the statistical sensitivity of the measurement. To test such iron film spin filters, we propose the use of polarized cold-neutron reflectometry, in addition to conventional UCN transmission experiments. The new method provides information on iron film samples complementary to the UCN tests and accelerates the development cycles. We developed a collaborative effort to produce iron film spin filters and test them with cold and ultracold neutrons available at JRR-3/MINE2 and J-PARC/MLF BL05. In this article, we review the methods of neutron EDM measurements, discuss the complementarity of this new approach to test UCN spin filters, provide an overview of our related activities, and present the first results of polarized cold-neutron reflectometry recently conducted at the MINE2 beamline.

Published
2024
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2. 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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3. 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

4. Optimisation du bruit de fond et de la réponse des détecteurs sphériques à gaz pour la recherche de matière noire légère

Author

Brossard, Alexis, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Department of physics, engineering physics and astronomy, Queen's University [Kingston, Canada], Université Paris-Saclay, Queen's university (Kingston, Canada), Gilles Gerbier, Ioannis Giomataris, and STAR, ABES

Subjects
Matière noire, Background, [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Gas detector, [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Dark matter, Spherical proportional counter, Compteur proportionnelle sphérique, Détecteur gazeux, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], [PHYS.ASTR.IM] Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Bruit de fond
Abstract

The spherical proportional counters have been used by the NEWS-G collaboration since 2013 for dark matter search with the SEDINE detector installed at the Laboratoire Souterrain de Modane. This first detector allowed for establishing a new limit on the WIMP-nucleon cross section for WIMPs of mass less than 0.6 GeV/c². Since then, the collaboration has been working on the development of a new detector. This thesis focuses on two improved aspects of the second detector. The study of the background observed by SEDINE led to the conclusion that it is dominated by the presence of Pb²¹⁰ decay chain on the surfaces and in the materials making up the detector and its shielding. This allowed for the selection of materials and manufacturing methods to reduce the background noise of the next detector. The second development concerns the detector anode. Placed in the center of the sphere, the anode ensures the formation of the signal. The latest developments show the ability of this component to ensure the detection of single electrons while being stable and with good resolution. This study made it possible to develop a new generation of detector which will be installed at SNOLAB in 2020., Les compteurs proportionnels sphériques sont utilisés pour la recherche de matière noire par la collaboration NEWS-G depuis 2013 avec le détecteur SEDINE installé au Laboratoire Souterrain de Modane. Ce premier détecteur a permis d'établir une nouvelle limite de la section efficace d'interaction WIMP-nucléon pour des WIMPs de masse inférieur à 0.6 GeV/c². Depuis, la collaboration travail à la mise au point d'un nouveau détecteur. Cette thèse se concentre sur deux aspects améliorés pour le second détecteur. L'étude du bruit de fond observé par SEDINE a permis de conclure que celui-ci est dominé par le présence de la chaine de désintégration du Pb²¹⁰ sur les surfaces et dans le matériaux composant le détecteur et son blindage. Ceci a permis de sélectionner des matériaux et des procédés de fabrication permettant de réduire le bruit de fond du prochain détecteur. Le second développement concerne l'anode du détecteur. Placée au centre de la sphère, l'anode assure la formation du signal. Les derniers développements montrent la capacité de ce composant à assurer la détection d'électrons uniques en étant stable et avec une bonne résolution.

Published
2020

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