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51. Search for the double-beta decay of 82Se to the excited states of 82Kr with NEMO-3

Author: F. Nova, Vit Vorobel, B. Morgan, C. L. Riddle, A. Smetana, Jose Busto, P. Guzowski, Y. Lemière, A. Remoto, A. Chapon, R. Breier, P. Loaiza, A. Basharina-Freshville, F. Xie, Yu. Shitov, J. C. Thomas, J. K. Sedgbeer, A.A. Smolnikov, Y. A. Ramachers, C. Cerna, M. Macko, A. Minotti, X. Sarazin, E. Chauveau, V.E. Kovalenko, Pavel P. Povinec, F. Mauger, G. Eurin, B. Richards, G. Szklarz, F. Perrot, Vl. I. Tretyak, O.I. Kochetov, C. Augier, H. Tedjditi, M. Cascella, S. Blot, S. Blondel, J.P. Cesar, S. Torre, B. Guillon, I. Stekl, Frédéric Nowacki, F. Piquemal, V. Palusova, F. Mamedov, Fedor Šimkovic, Igor Nemchenok, R. Salazar, A. Žukauskas, D. Duchesneau, J. Mott, L. Dawson, C. Vilela, P. Přidal, C. Hugon, Jouni Suhonen, R. Arnold, D. Lalanne, D. Waters, C.S. Sutton, Ch. Marquet, S. Söldner-Rembold, J. J. Evans, H. Gómez, A. Pin, Karol Lang, A. Huber, C. Patrick, A. A. Klimenko, D. Boursette, Ruben Saakyan, Guillaume Lutter, J. L. Reyss, R. B. Pahlka, I. Vanushin, L. Simard, G. Oliviéro, V. I. Tretyak, A. Chopra, Z. J. Liptak, Lukas Fajt, A. S. Barabash, H. Ohsumi, C. Girard-Carillo, Ph. Hubert, X. Garrido, T. Le Noblet, Dominique Durand, C. Macolino, R. L. Flack, M. Bongrand, D.V. Filosofov, S. Jullian, S. I. Konovalov, Masaharu Nomachi, S. Calvez, V. V. Timkin, V. G. Egorov, E. Rukhadze, X.R. Liu, V.I. Umatov, V. Brudanin, A. J. Caffrey, R. Hodák, Karel Smolek, B. Soulé, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), 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), Centre de Physique des Particules de Marseille (CPPM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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 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 Souterrain de Modane (LSM - UMR 6417), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS), NEMO-3, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire d'Annecy de Physique des Particules (LAPP), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Particle Physics and Astronomy Research Council (PPARC), Science and Technology Facilities Council (STFC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Arnold, R, Augier, C, Barabash, A, Basharina-Freshville, A, Blondel, S, Blot, S, Bongrand, M, Boursette, D, Breier, R, Brudanin, V, Busto, J, Caffrey, A, Calvez, S, Cascella, M, Cerna, C, Cesar, J, Chapon, A, Chauveau, E, Chopra, A, Dawson, L, Duchesneau, D, Durand, D, Egorov, V, Eurin, G, Evans, J, Fajt, L, Filosofov, D, Flack, R, Garrido, X, Girard-Carillo, C, Gomez, H, Guillon, B, Guzowski, P, Hodak, R, Huber, A, Hubert, P, Hugon, C, Jullian, S, Klimenko, A, Kochetov, O, Konovalov, S, Kovalenko, V, Lalanne, D, Lang, K, Lemiere, Y, Le Noblet, T, Liptak, Z, Liu, X, Loaiza, P, Lutter, G, Macko, M, Macolino, C, Mamedov, F, Marquet, C, Mauger, F, Minotti, A, Morgan, B, Mott, J, Nemchenok, I, Nomachi, M, Nova, F, Nowacki, F, Ohsumi, H, Oliviero, G, Pahlka, R, Palusova, V, Patrick, C, Perrot, F, Pin, A, Piquemal, F, Povinec, P, Pridal, P, Ramachers, Y, Remoto, A, Reyss, J, Richards, B, Riddle, C, Rukhadze, E, Saakyan, R, Salazar, R, Sarazin, X, Sedgbeer, J, Shitov, Y, Simard, L, Simkovic, F, Smetana, A, Smolek, K, Smolnikov, A, Soldner-Rembold, S, Soule, B, Stekl, I, Suhonen, J, Sutton, C, Szklarz, G, Tedjditi, H, Thomas, J, Timkin, V, Torre, S, Tretyak, V, Umatov, V, Vanushin, I, Vilela, C, Vorobel, V, Waters, D, Xie, F, and Zukauskas, A
Subjects: Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Analytical chemistry, Se, Double beta decay, Excited state, Neutrino, FOS: Physical sciences, gamma ray: particle identification, 01 natural sciences, NO, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), PE2_2, Neutrino Ettore Majorana Observatory, 0201 Astronomical and Space Sciences, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 82Se, Double beta decay, Neutrino, 82Se, excited state, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, physics.ins-det, 0206 Quantum Physics, Physics, hep-ex, 010308 nuclear & particles physics, double-beta decay, Instrumentation and Detectors (physics.ins-det), State (functional analysis), krypton: nuclide, Nuclear & Particles Physics, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, selenium: nuclide, nucleus: excited state, experimental results
Abstract: The double-beta decay of 82Se to the 0 1 + excited state of 82Kr has been studied with the NEMO-3 detector using 0.93 kg of enriched 82Se measured for 4.75 y, corresponding to an exposure of 4.42 kg⋅y. A dedicated analysis to reconstruct the γ-rays has been performed to search for events in the 2e2γ channel. No evidence of a 2 ν β β decay to the 0 1 + state has been observed and a limit of T 1 / 2 2 ν ( Se 82 , 0 g s + → 0 1 + ) > 1.3 × 10 21 y at 90% CL has been set. Concerning the 0 ν β β decay to the 0 1 + state, a limit for this decay has been obtained with T 1 / 2 0 ν ( Se 82 , 0 g s + → 0 1 + ) > 2.3 × 10 22 y at 90% CL, independently from the 2 ν β β decay process. These results are obtained for the first time with a tracko-calo detector, reconstructing every particle in the final state.
Published: 2020
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52. Matrix elements for neutrinoless double beta decay

Author: Fedor Šimkovic
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Electron capture, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, High Energy Physics::Phenomenology, Atomic and Molecular Physics, and Optics, Nuclear physics, MAJORANA, Matrix (mathematics), Double beta decay, Quasiparticle, High Energy Physics::Experiment, Neutrino, Interacting boson model, Random phase approximation
Abstract: The status of calculation of the neutrinoless double beta decay ( 0 ν β β -decay) nuclear matrix elements (NMEs) is reviewed. The 0 ν β β -decay NMEs obtained in the framework of the Quasiparticle Random Phase Approximation (QRPA), Large Scale Shell Model (LSSM), Interacting Boson Model (IBM), Projected Hartree-Fock Bogoliubov approach (P-HFB) and Energy Density Functional Method (EDF) are presented and discussed. The problem of reliable determination of the 0 ν β β -decay NMEs is addressed. It is manifested that the uncertainty associated with the calculation of the 0 ν β β -decay NMEs can be diminished by suitable chosen nuclear probes. Further, the recent development in the field of double beta decay showed that the search for the neutrinoless double electron capture process ( 0 ν E C E C ) may establish the Majorana nature of neutrinos. This possibility should be considered as alternative and complementary to searches for the 0 ν β β -decay.
Published: 2019
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53. The optical noise monitoring systems of the Lake Baikal environment for the Baikal-GVD telescope

Author: T. I. Gress, V. B. Brudanin, V.F. Kulepov, K.V. Golubkov, Lukas Fajt, Evgeniy Khramov, I. A. Belolaptikov, A. V. Skurikhin, M.N. Sorokovikov, A.V. Avrorin, Konstantin Kebkal, M.M. Kolbin, B.A. Tarashansky, Evgenii V Rjabov, A.D. Avrorin, A.P. Koshechkin, G.V. Domogatsky, V.D. Rushay, V. M. Aynutdinov, M.V. Kruglov, Sergey Yakovlev, K.V. Konischev, A. A. Doroshenko, Zh.-A.M. Dzhilkibaev, M.B. Milenin, R. Bannash, Fedor Šimkovic, I. Stekl, R. Ivanov, V.A. Tabolenko, V. Nazari, E.N. Pliskovsky, B.A. Shaybonov, A. N. Dyachok, N.S. Gorshkov, A.V. Kozhin, Olga Suvorova, G.B. Safronov, Rastislav Dvornický, M.K. Kryukov, S.V. Fialkovsky, E. O. Sushenok, Mark Shelepov, N. M. Budnev, D. P. Petukhov, A.V. Korobchenko, A. I. Panfilov, O.G. Kebkal, M.I. Rozanov, A.G. Solovjev, R. R. Mirgazov, and Aleksandr Gafarov
Subjects: Physics, Telescope, Optics, law, business.industry, Neutrino telescope, Cluster (physics), Optical noise, Monitoring system, Luminescence, business, Light field, law.invention
Abstract: We present data on the luminescence of the Baikal water medium collected with the Baikal-GVD neutrino telescope. This three-dimensional array of light sensors allows the observation of time and spatial variations of the ambient light field. We report on observation of an increase of luminescence activity in 2016 and 2018. On the contrary, we observed practically constant optical noise in 2017. An agreement has been found between two independent optical noise data sets. These are data collected with online monitoring system and the trigger system of the cluster.
Published: 2019
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54. The Baikal-GVD neutrino telescope: First results of multi-messenger study

Author: R. R. Mirgazov, A.V. Avrorin, T. I. Gress, Lukas Fajt, B.A. Tarashansky, M.M. Kolbin, G.B. Safronov, M.V. Kruglov, Rastislav Dvornický, Fedor Šimkovic, K.V. Golubkov, Aleksandr Gafarov, M.N. Sorokovikov, S.V. Fialkovsky, E. O. Sushenok, V. M. Aynutdinov, A.D. Avrorin, A.V. Korobchenko, Sergey Yakovlev, Evgeniy Khramov, Mark Shelepov, I. A. Belolaptikov, Konstantin Kebkal, V. B. Brudanin, V.F. Kulepov, A. V. Skurikhin, G.V. Domogatsky, N.S. Gorshkov, Zhan-Arys Magysovich Dzhilkibaev, V.D. Rushay, M.B. Milenin, Evgenii V Rjabov, E.N. Pliskovsky, A. I. Panfilov, O.G. Kebkal, M.I. Rozanov, R. Bannash, A.G. Solovjev, V. Nazari, N. M. Budnev, I. Stekl, D. P. Petukhov, R. Ivanov, V.A. Tabolenko, A.P. Koshechkin, A. A. Doroshenko, K.V. Konischev, B.A. Shaybonov, A. N. Dyachok, A.V. Kozhin, Olga Suvorova, and M.K. Kryukov
Subjects: Physics, Physics::Instrumentation and Detectors, Gravitational wave, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Astrophysics::Instrumentation and Methods for Astrophysics, Cosmic ray, Astrophysics, Coincidence, Universe, law.invention, Telescope, Neutrino detector, law, High Energy Physics::Experiment, Neutrino, Zenith, media_common
Abstract: Multi-messenger astronomy is a powerful tool to study the physical processes driving the non-thermal Universe. A combination of observations in cosmic rays, neutrinos, photons of all wavelengths and gravitational waves is expected. The alert system of the Baikal-GVD detector under construction will allow for a fast, on-line reconstruction of neutrino events recorded by the Baikal-GVD telescope and - if predefined conditions are satisfied - for the formation of an alert message to other communities. The preliminary results of searches for high-energy neutrinos in coincidence with GW170817/GRB170817A using the cascade mode of neutrino detection are discussed. Two Baikal-GVD clusters were operating during 2017. The zenith angle of NGC 4993 at the detection time of the GW170817 was 93.3 degrees. No events spatially coincident with GRB170817A were found. Given the non-detection of neutrino events associated with GW170817, upper limits on the neutrino fluence were established.
Published: 2019
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55. Precision Analysis of the Xe136 Two-Neutrino ββ Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements

Author: A. Gando, T. O'Donnell, Y. Kamei, Sanshiro Enomoto, S. Hirata, S. Hayashida, Yu. Efremenko, K. Soma, M Ha Minh, S. Umehara, Hugon J Karwowski, Fedor Šimkovic, Hideki Watanabe, Y. Gando, K. Tamae, John G. Learned, S. Matsuda, B. K. Fujikawa, B. E. Berger, K. Ueshima, S. Otsuka, J. A. Detwiler, Lindley Winslow, S. Obara, D. M. Markoff, K. Hosokawa, Akira Ono, J. Maricic, H. Ozaki, N. Ota, Toyohiko Kinoshita, D. Chernyak, M. P. Decowski, Y. Honda, Ken-Ichi Fushimi, A. Suzuki, T. Mitsui, T. Hachiya, K. Nakamura, A. Kozlov, Koji Ishidoshiro, Werner Tornow, K. Kamizawa, Y Takemoto, Kunio Inoue, I. Shimizu, R Dvornický, Tsugio Sato, S. Yoshida, H. Ikeda, Y. Shibukawa, A. Takeuchi, J. Shirai, Y. Shirahata, M. Koga, and Javier Fernandez Menendez
Subjects: Nuclear physics, Physics, Formalism (philosophy of mathematics), Quasiparticle, Nuclear shell model, General Physics and Astronomy, Electron, Neutrino
Abstract: We present a precision analysis of the ^{136}Xe two-neutrino ββ electron spectrum above 0.8 MeV, based on high-statistics data obtained with the KamLAND-Zen experiment. An improved formalism for the two-neutrino ββ rate allows us to measure the ratio of the leading and subleading 2νββ nuclear matrix elements (NMEs), ξ_{31}^{2ν}=-0.26_{-0.25}^{+0.31}. Theoretical predictions from the nuclear shell model and the majority of the quasiparticle random-phase approximation (QRPA) calculations are consistent with the experimental limit. However, part of the ξ_{31}^{2ν} range allowed by the QRPA is excluded by the present measurement at the 90% confidence level. Our analysis reveals that predicted ξ_{31}^{2ν} values are sensitive to the quenching of NMEs and the competing contributions from low- and high-energy states in the intermediate nucleus. Because these aspects are also at play in neutrinoless ββ decay, ξ_{31}^{2ν} provides new insights toward reliable neutrinoless ββ NMEs.
Published: 2019
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56. Neutrinoless double beta decay: Theory challenges

Author: Fedor Šimkovic
Subjects: Physics, Particle physics, Double beta decay
Published: 2019
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57. Time synchronization system of Baikal-GVD

Author: T. I. Gress, A.V. Avrorin, Lukas Fajt, V. M. Aynutdinov, Sergey Yakovlev, E. V. Ryabov, M.M. Kolbin, Aleksandr Gafarov, M.N. Sorokovikov, T. V. Elzhov, O.G. Kebkal, R. R. Mirgazov, R. Bannasch, M.I. Rozanov, Z. Bardačová, Mark Shelepov, S.V. Fialkovsky, A. P. Stromakov, E. O. Sushenok, Dmitry V. Naumov, V. B. Brudanin, V.F. Kulepov, A.G. Solovjev, Evgeniy Khramov, Pa. Malecki, A. V. Skurikhin, A. A. Doroshenko, I. A. Belolaptikov, Konstantin Kebkal, I. Stekl, V.A. Tabolenko, Zh.-A.M. Dzhilkibaev, V. Y. Dik, W. Noga, Y. V. Yablokova, V.D. Rushay, V. A. Allakhverdyan, N.S. Gorshkov, Yury Malyshkin, B.A. Tarashansky, N. M. Budnev, K.V. Golubkov, D. P. Petukhov, A. E. Sirenko, K. A. Kopański, E.N. Pliskovsky, A.D. Avrorin, G.B. Safronov, G.V. Domogatsky, M. S. Katulin, M.V. Kruglov, Rastislav Dvornický, A.V. Korobchenko, Fedor Šimkovic, V. A. Kozhin, M.B. Milenin, K.V. Konischev, I. V. Borina, D. N. Zaborov, A.P. Koshechkin, V. Nazari, B.A. Shaybonov, A. N. Dyachok, E. Eckerová, Olga Suvorova, and M.K. Kryukov
Subjects: Physics, Neutrino detector, Electronic engineering, Instrumentation, Mathematical Physics, Time synchronization
Published: 2021
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58. Time calibration of the neutrino telescope Baikal-GVD

Author: K.V. Konischev, I. Shtekl, B.A. Tarashansky, A.D. Avrorin, M.N. Sorokovikov, B. A. Shaibonov, Mark Shelepov, G.B. Safronov, A.V. Avrorin, A. N. Dyachok, D.A. Kuleshov, Rastislav Dvornický, A. A. Doroshenko, G.V. Domogatsky, E.V. Khramov, V.B. Brudanin, Zh.-A.M. Dzhilkibaev, K.V. Golubkov, Olga Suvorova, N. M. Budnev, D. P. Petukhov, Sergey Yakovlev, N.S. Gorshkov, V.D. Rushay, V.M. Aynutdinov, M.K. Kryukov, A.P. Koshechkin, V. A. Kozhin, Fedor Šimkovic, M.V. Kruglov, A. I. Panfilov, Lukas Fajt, O.G. Kebkal, M.I. Rozanov, M.M. Kolbin, M.B. Milenin, R. R. Mirgazov, A.G. Solovjev, S.V. Fialkovsky, R. Bannash, V.A. Tabolenko, V. Nazari, T.I. Gres, E.N. Pliskovsky, A.P. Korobchenko, Evgenii V Rjabov, I. A. Belolaptikov, Konstantin Kebkal, Aleksandr Gafarov, A. V. Zagorodnikov, and V.F. Kulepov
Subjects: Physics, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, QC1-999, Detector, Neutrino telescope, Astrophysics::Instrumentation and Methods for Astrophysics, Scale (descriptive set theory), 01 natural sciences, Position (vector), 0103 physical sciences, Calibration, Cluster (physics), 010306 general physics, Nonlinear Sciences::Pattern Formation and Solitons, Energy (signal processing), Remote sensing
Abstract: Baikal-GVD is a cubic-kilometer scale neutrino telescope, which is currently under construction in Lake Baikal. Baikal-GVD is an array of optical modules arranged in clusters. The first cluster of the array has been deployed and commissioned in April 2015. To date, Baikal-GVD consists of 3 clusters with 864 optical modules. One of the vital conditions for optimal energy, position and direction reconstruction of the detected particles is the time calibration of the detector. In this article, we describe calibration equipment and methods used in Baikal-GVD and demonstrate the accuracy of the calibration procedures.
Published: 2019

59. Detailed studies of $^{100}$Mo two-neutrino double beta decay in NEMO-3

Author: S. Blot, I. Vanushin, Lukas Fajt, M. Bongrand, Frédéric Nowacki, Karel Smolek, R. Saakyan, C. Vilela, B. Soulé, C. Augier, Masaharu Nomachi, Vl. I. Tretyak, S. Jullian, A. Smetana, V.E. Kovalenko, H. Gómez, Y. A. Ramachers, Jose Busto, F. Mauger, J. J. Evans, P. Guzowski, Y. Lemière, A. S. Barabash, S. Calvez, C. Patrick, A. Huber, D.V. Filosofov, M. Macko, Jouni Suhonen, A. Chapon, X. Sarazin, F. Xie, A. Chopra, Z. J. Liptak, A. J. Caffrey, R. Hodák, A. Žukauskas, V.I. Umatov, J.P. Cesar, Ph. Hubert, S. Torre, C. Girard-Carillo, X. Garrido, V. G. Egorov, O.I. Kochetov, S. Söldner-Rembold, F. Mamedov, E. Rukhadze, Yu. Shitov, V. Brudanin, D. Boursette, G. Eurin, D. Waters, J. C. Thomas, J. K. Sedgbeer, S. I. Konovalov, H. Ohsumi, F. Piquemal, T. Le Noblet, E. Chauveau, Guillaume Lutter, Dominique Durand, R. Dvornický, C. Cerna, Kevin Lang, Pavel P. Povinec, Ch. Marquet, C. Macolino, G. Oliviéro, C. Hugon, F. Nova, A. Minotti, A. Pin, R. L. Flack, L. Dawson, D. Lalanne, J. L. Reyss, B. Morgan, Michele Cascella, P. Loaiza, C. L. Riddle, R. B. Pahlka, L. Simard, D. Duchesneau, A. Remoto, R. Salazar, X.R. Liu, C.S. Sutton, R. Arnold, V. I. Tretyak, A.A. Smolnikov, G. Szklarz, B. Guillon, Fedor Šimkovic, P. Přidal, Igor Nemchenok, J. Mott, V. V. Timkin, Vit Vorobel, A. Salamatin, A. Basharina-Freshville, F. Perrot, H. Tedjditi, S. Blondel, I. Stekl, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), 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), Centre de Physique des Particules de Marseille (CPPM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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 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 Souterrain de Modane (LSM - UMR 6417), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS), NEMO-3, Arnold, R, Augier, C, Barabash, A, Basharina-Freshville, A, Blondel, S, Blot, S, Bongrand, M, Boursette, D, Brudanin, V, Busto, J, Caffrey, A, Calvez, S, Cascella, M, Cerna, C, Cesar, J, Chapon, A, Chauveau, E, Chopra, A, Dawson, L, Duchesneau, D, Durand, D, Dvornicky, R, Egorov, V, Eurin, G, Evans, J, Fajt, L, Filosofov, D, Flack, R, Garrido, X, Girard-Carillo, C, Gomez, H, Guillon, B, Guzowski, P, Hodak, R, Huber, A, Hubert, P, Hugon, C, Jullian, S, Kochetov, O, Konovalov, S, Kovalenko, V, Lalanne, D, Lang, K, Lemiere, Y, Noblet, T, Liptak, Z, Liu, X, Loaiza, P, Lutter, G, Macko, M, Macolino, C, Mamedov, F, Marquet, C, Mauger, F, Minotti, A, Morgan, B, Mott, J, Nemchenok, I, Nomachi, M, Nova, F, Nowacki, F, Ohsumi, H, Oliviero, G, Pahlka, R, Patrick, C, Perrot, F, Pin, A, Piquemal, F, Povinec, P, Pridal, P, Ramachers, Y, Remoto, A, Reyss, J, Riddle, C, Rukhadze, E, Saakyan, R, Salamatin, A, Salazar, R, Sarazin, X, Sedgbeer, J, Shitov, Y, Simard, L, Simkovic, F, Smetana, A, Smolek, K, Smolnikov, A, Soldner-Rembold, S, Soule, B, Stekl, I, Suhonen, J, Sutton, C, Szklarz, G, Tedjditi, H, Thomas, J, Timkin, V, Torre, S, Tretyak, V, Umatov, V, Vanushin, I, Vilela, C, Vorobel, V, Waters, D, Xie, F, Zukauskas, A, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire d'Annecy de Physique des Particules (LAPP), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Science and Technology Facilities Council (STFC)
Subjects: Particle physics, S029MT, Physics and Astronomy (miscellaneous), FOS: Physical sciences, Elementary particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, invariance: Lorentz, 01 natural sciences, 7. Clean energy, neutrinoless double beta decay, decay modes, Physics, Particles & Fields, double-beta decay: (0neutrino), SEARCH, Double beta decay, 0103 physical sciences, ground state, Nuclear Experiment (nucl-ex), 010306 general physics, 0206 Quantum Physics, Engineering (miscellaneous), Nuclear Experiment, Majoron, S076H2N, Physics, Science & Technology, HALF-LIFE, 010308 nuclear & particles physics, MO-100, High Energy Physics::Phenomenology, Nuclear & Particles Physics, violation: Lorentz, nucleus: transition, STATES, statistics, Physical Sciences, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, spectral, electron: energy spectrum, High Energy Physics::Experiment, Neutrino, Ground state, Energy (signal processing), Radioactive decay, Lepton
Abstract: The full data set of the NEMO-3 experiment has been used to measure the half-life of the two-neutrino double beta decay of $^{100}$Mo to the ground state of $^{100}$Ru, $T_{1/2} = \left[ 6.81 \pm 0.01\,\left(\mbox{stat}\right) ^{+0.38}_{-0.40}\,\left(\mbox{syst}\right) \right] \times10^{18}$ y. The two-electron energy sum, single electron energy spectra and distribution of the angle between the electrons are presented with an unprecedented statistics of $5\times10^5$ events and a signal-to-background ratio of ~80. Clear evidence for the Single State Dominance model is found for this nuclear transition. Limits on Majoron emitting neutrinoless double beta decay modes with spectral indices of n=2,3,7, as well as constraints on Lorentz invariance violation and on the bosonic neutrino contribution to the two-neutrino double beta decay mode are obtained., 11 pages, 9 figures
Published: 2019
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60. Development of methods for the preparation of radiopure 82Se sources for the SuperNEMO neutrinoless double-beta decay experiment

Author: J. J. Evans, F. Perrot, Masaharu Nomachi, Jihane Maalmi, Dominique Breton, D. Duchesneau, P. Guzowski, Y. Lemière, X.R. Liu, R. Breier, S. Jullian, Hector Gomez, S. I. Konovalov, V. Egorov, F.A. Tashimova, Y. A. Ramachers, G. Claverie, B. Richards, V. B. Brudanin, J.P. Cesar, S. Torre, F. Mamedov, R. Salazar, Karol Holý, D. Waters, X. Sarazin, V. V. Timkin, V.I. Umatov, O.I. Kochetov, A. A. Mirsagatova, C. Vilela, A. V. Rakhimov, C. Hugon, Juergen Thomas, G. Eurin, I. Stekl, J. S. Ricol, J. Mott, I. I. Sadikov, A. S. Barabash, Lukas Fajt, D.V. Filosofov, H. Ohsumi, E. Rukhadze, T. Le Noblet, Ch. Bourgeois, Fedor Šimkovic, Igor Nemchenok, A. Huber, N.I. Rukhadze, A. Minotti, N.A. Mirzayev, L. Simard, A. Smetana, Vit Vorobel, S. Snow, P Pridal, J. Busto, A. Chopra, Z. J. Liptak, C. Cerna, G. Warot, Karol Lang, D. V. Karaivanov, H. Burešova, V. Kovalenko, M. Bongrand, E. Chauveau, Pavel P. Povinec, A. Žukauskas, A. Rebii, F. Nova, J. K. Sedgbeer, B. Morgan, A. Remoto, A. Basharina-Freshville, M. Kauer, R. B. Pahlka, Ruben Saakyan, F. Mauger, Guillaume Lutter, Karel Smolek, X. Garrido, B. Soulé, S. Calvez, A. A. Klimenko, G. Oliviéro, V.I. Tretyak, R. L. Flack, Michele Cascella, Vl. I. Tretyak, R. Hodák, S. Söldner-Rembold, Yu. Shitov, P. Loaiza, Ch. Marquet, B. Guillon, A.A. Smolnikov, M. Zampaolo, S. Blot, M. Spavorova, I. Moreau, E. Birdsall, V. Palušová, Joleen Pater, A. Jeremie, F. Piquemal, M. Macko, F. Delalee, S. De Capua, Laboratoire de l'Accélérateur Linéaire (LAL), 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), Centre de Physique des Particules de Marseille (CPPM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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 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 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), 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), 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 d'Annecy de Physique des Particules (LAPP), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), 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), Rakhimov, A, Barabash, A, Basharina-Freshville, A, Blot, S, Bongrand, M, Bourgeois, C, Breton, D, Breier, R, Birdsall, E, Brudanin, V, Buresova, H, Busto, J, Calvez, S, Cascella, M, Cerna, C, Cesar, J, Chauveau, E, Chopra, A, Claverie, G, De Capua, S, Delalee, F, Duchesneau, D, Egorov, V, Eurin, G, Evans, J, Fajt, L, Filosofov, D, Flack, R, Garrido, X, Gomez, H, Guillon, B, Guzowski, P, Hodak, R, Holy, K, Huber, A, Hugon, C, Jeremie, A, Jullian, S, Karaivanov, D, Kauer, M, Klimenko, A, Kochetov, O, Konovalov, S, Kovalenko, V, Lang, K, Lemiere, Y, Le Noblet, T, Liptak, Z, Liu, X, Loaiza, P, Lutter, G, Maalmi, J, Macko, M, Mamedov, F, Marquet, C, Mauger, F, Minotti, A, Mirsagatova, A, Mirzayev, N, Moreau, I, Morgan, B, Mott, J, Nemchenok, I, Nomachi, M, Nova, F, Ohsumi, H, Oliviero, G, Pahlka, R, Pater, J, Palusova, V, Perrot, F, Piquemal, F, Povinec, P, Pridal, P, Ramachers, Y, Rebii, A, Remoto, A, Richards, B, Ricol, J, Rukhadze, E, Rukhadze, N, Saakyan, R, Sadikov, I, Salazar, R, Sarazin, X, Sedgbeer, J, Shitov, Y, Simkovic, F, Simard, L, Smetana, A, Smolek, K, Smolnikov, A, Snow, S, Soldner-Rembold, S, Soule, B, Spavorova, M, Stekl, I, Tashimova, F, Thomas, J, Timkin, V, Torre, S, Tretyak, V, Umatov, V, Vilela, C, Vorobel, V, Warot, G, Waters, D, Zampaolo, M, Zukauskas, A, and 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)
Subjects: SuperNEMO, Technology, purification, ion exchange chromatography, SuperNEMO, LSM Modane, mass spectrometry, neutron activation analysis, purification, Selenium-82, measurement methods, Ion chromatography, chemistry.chemical_element, Selenium-82, fabrication, Mass spectrometry, 01 natural sciences, neutron activation analysi, NO, Neutrino Ettore Majorana Observatory, LSM Modane, double-beta decay: (0neutrino), Decantation, 0103 physical sciences, 0302 Inorganic Chemistry, Chemistry, Inorganic & Nuclear, Physical and Theoretical Chemistry, Neutron activation analysis, 010306 general physics, Nuclear Science & Technology, background: radioactivity, mass spectrometry, [PHYS]Physics [physics], Detection limit, Science & Technology, 010308 nuclear & particles physics, Radiochemistry, IMPURITIES, ion exchange chromatography, Contamination, Chemistry, chemistry, SPECTROMETRY, 13. Climate action, sulfur, Physical Sciences, ion: exchange, Inorganic & Nuclear Chemistry, selenium: production, selenium: nuclide, oxygen, Selenium, neutron activation analysis
Abstract: International audience; AbstractA radiochemical method for producing 82Se sources with an ultra-low level of contamination of natural radionuclides (40K, decay products of 232Th and 238U) has been developed based on cation-exchange chromatographic purification with reverse removal of impurities. It includes chromatographic separation (purification), reduction, conditioning (which includes decantation, centrifugation, washing, grinding, and drying), and 82Se foil production. The conditioning stage, during which highly dispersed elemental selenium is obtained by the reduction of purified selenious acid (H2SeO3) with sulfur dioxide (SO2) represents the crucial step in the preparation of radiopure 82Se samples. The natural selenium (600 g) was first produced in this procedure in order to refine the method. The technique developed was then used to produce 2.5 kg of radiopure enriched selenium (82Se). The produced 82Se samples were wrapped in polyethylene (12 μm thick) and radionuclides present in the sample were analyzed with the BiPo-3 detector. The radiopurity of the plastic materials (chromatographic column material and polypropylene chemical vessels), which were used at all stages, was determined by instrumental neutron activation analysis. The radiopurity of the 82Se foils was checked by measurements with the BiPo-3 spectrometer, which confirmed the high purity of the final product. The measured contamination level for 208Tl was 8–54 μBq/kg, and for 214Bi the detection limit of 600 μBq/kg has been reached.
Published: 2019
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61. Baikal-GVD: cascades

Author: A.P. Koshechkin, A. I. Panfilov, O.G. Kebkal, M.I. Rozanov, V.D. Rushay, Olga Suvorova, R. R. Mirgazov, A.G. Solovjev, V.M. Aynutdinov, Mark Shelepov, D. P. Petukhov, G.V. Domogatsky, A.P. Korobchenko, E.N. Pliskovsky, M.N. Sorokovikov, B.A. Tarashansky, M.K. Kryukov, N. M. Budnev, B. A. Shaibonov, V. A. Kozhin, S.V. Fialkovsky, K.V. Konischev, A.D. Avrorin, Evgenii V Rjabov, A. A. Doroshenko, K.V. Golubkov, V.F. Kulepov, Zh.-A.M. Dzhilkibaev, E.V. Khramov, V. Nazari, A.V. Avrorin, D.A. Kuleshov, A. N. Dyachok, Aleksandr Gafarov, N.S. Gorshkov, M.B. Milenin, A. V. Zagorodnikov, Sergey Yakovlev, Lukas Fajt, R. Bannash, T.I. Gres, G.B. Safronov, Rastislav Dvornický, M.M. Kolbin, I. Shtekl, Fedor Šimkovic, V.A. Tabolenko, V.B. Brudanin, I. A. Belolaptikov, Konstantin Kebkal, and M.V. Kruglov
Subjects: Physics, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, QC1-999, Neutrino telescope, High Energy Physics::Phenomenology, Mode (statistics), Astrophysics::Instrumentation and Methods for Astrophysics, 01 natural sciences, Nuclear physics, Cascade, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, 010306 general physics
Abstract: Baikal-GVD is a next generation, kilometer-scale neutrino telescope currently under construction in Lake Baikal. GVD is formed by multi-megaton subarrays (clusters) and is designed for the detection of astrophysical neutrino fluxes at energies from a few TeV up to 100 PeV. The design of Baikal-GVD allows one to search for astrophysical neutrinos with flux values measured by IceCube already at early phases of the array construction. We present here preliminary results of the search for high-energy neutrinos via the cascade mode obtained in 2015 and 2016.
Published: 2019

62. Baikal-GVD: first results and prospects

Author: R. Dvornicky, V.F. Kulepov, Valery Zurbanov, A.P. Koshechkin, T. I. Gress, Lukas Fajt, A.V. Skurihin, M.M. Kolbin, V.B. Brudanin, A.V. Kozhin, A.V. Avrorin, Olga Suvorova, V.D. Rushay, Fedor Šimkovic, E. A. Osipova, L. V. Pankov, G.B. Safronov, K.V. Golubkov, Aleksandr Gafarov, B.A. Tarashansky, R. R. Mirgazov, A. V. Zagorodnikov, K.V. Konischev, A. I. Panfilov, E.N. Pliskovsky, A. A. Doroshenko, I. A. Belolaptikov, O.G. Kebkal, Konstantin Kebkal, Zh.-A.M. Dzhilkibaev, M.I. Rozanov, B.A. Shaybonov, A.G. Solovjev, A. N. Dyachok, M.N. Sorokovnikov, E.V. Khramov, V. M. Aynutdinov, Sergey Yakovlev, Z. Honz, M.B. Milenin, A.D. Avrorin, G.V. Domogatsky, R. Bannash, I. Stekl, V.A. Tabolenko, Evgenii V Rjabov, Mark Shelepov, A.V. Korobchenko, D.A. Kuleshov, N. M. Budnev, and S.V. Fialkovsky
Subjects: Physics, Shore, geography, geography.geographical_feature_category, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, QC1-999, Neutrino telescope, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, 01 natural sciences, law.invention, Relativistic particle, Telescope, law, 0103 physical sciences, Cluster (physics), High Energy Physics::Experiment, Neutrino, 010306 general physics, Effective volume
Abstract: Next generation cubic kilometer scale neutrino telescope Baikal-GVD is currently under construction in Lake Baikal. The detector is specially designed for search for high energies neutrinos whose sources are not yet reliably identified. Since April 2018 the telescope has been successfully operated in complex of three functionally independent clusters i.e. sub-arrays of optical modules (OMs) where now are hosted 864 OMs on 24 vertical strings. Each cluster is connected to shore by individual electro-optical cables. The effective volume of the detector for neutrino initiated cascades of relativistic particles with energy above 100 TeV has been increased up to about 0.15 km3. Preliminary results obtained with data recorded in 2016 and 2017 are discussed.
Published: 2019

63. Environmental studies in Lake Baikal: basic facts and perspectives for interdisciplinary research

Author: M.N. Sorokovikov, Evgenii V Rjabov, B. A. Shaibonov, R. Bannash, S.V. Fialkovsky, K.V. Konischev, T.I. Gres, M.V. Kruglov, V.A. Tabolenko, N.S. Gorshkov, E. O. Kiktenko, A.V. Avrorin, M.B. Milenin, E.S. Troitskaya, B.A. Tarashansky, V.F. Kulepov, E.N. Pliskovsky, A.D. Avrorin, V.B. Brudanin, G.V. Domogatsky, Mark Shelepov, N. M. Budnev, I. A. Belolaptikov, R. R. Mirgazov, A.P. Koshechkin, Konstantin Kebkal, M. Sturm, D. P. Petukhov, E.V. Khramov, I.A. Portyanskaya, K.V. Golubkov, A.P. Korobchenko, S.V. Lovtsov, V. Nazari, A. A. Doroshenko, Zh.-A.M. Dzhilkibaev, V. M. Aynutdinov, I. Shtekl, V. A. Kozhin, Sergey Yakovlev, A. I. Panfilov, O.G. Kebkal, M.I. Rozanov, V.D. Rushay, Aleksandr Gafarov, V.O. Serdyuk, A. V. Zagorodnikov, A.G. Solovjev, D.A. Kuleshov, Lukas Fajt, M.M. Kolbin, Fedor Šimkovic, Olga Suvorova, M.K. Kryukov, A. N. Dyachok, S.M. Korotaev, G.B. Safronov, and Rastislav Dvornický
Subjects: 010504 meteorology & atmospheric sciences, Earth science, Physics, QC1-999, Neutrino telescope, 01 natural sciences, Deep water, Environmental studies, Neutrino detector, 0103 physical sciences, Underwater, Neutrino, Endemism, 010303 astronomy & astrophysics, Surface water, 0105 earth and related environmental sciences
Abstract: Lake Baikal in Siberia is one of the most interesting lakes in the world. It is the world’s largest reservoir of fresh surface water and home to several hundred endemic species. At the same time it harboured the first underwater neutrino telescope NT200, now followed by its successor Baikal-GVD, a cubic-kilometre scale neutrino telescope. Within the Baikal Neutrino project a number of methods and instruments have been designed to study various processes in the Baikal ecosystem. Hundreds of optical, acoustic and other sensors allow for long-term 3D monitoring of water parameters like temperature, inherent optical properties or the intensity of water luminescence, as well as processes like sedimentation or deep water renewal. Here we present selected results of the interdisciplinary environmental studies.
Published: 2019

64. 0νββ and 2νββ nuclear matrix elements evaluated in closure approximation, neutrino potentials and SU(4) symmetry

Author: Petr Vogel, Adam Smetana, and Fedor Šimkovic
Subjects: Physics, 010308 nuclear & particles physics, Isoscalar, Closure (topology), 01 natural sciences, Symmetry (physics), Renormalization, Matrix (mathematics), Amplitude, 0103 physical sciences, Neutrino, 010306 general physics, Random phase approximation, Mathematical physics
Abstract: The intimate relation between the Gamow-Teller part of the matrix element M^(0ν)_(GT) and the 2νββ closure matrix element M^(2ν)_(cl) is explained and explored. If the corresponding radial dependence C^(2ν)_(cl)(r) would be known, M^(0ν) corresponding to any mechanism responsible for the 0νββ decay can be obtained as a simple integral. However, the M^(2ν)_(cl) values, and therefore also the functions C^(2ν)_(cl)(r), sensitively depend not only on the properties of the first few 1^+ states but also of higher-lying 1^+ states in the intermediate odd-odd nuclei. We show that the β^− and β^+ amplitudes of such states typically have opposite relative signs, and their contributions reduce severally the M^(2ν)_(cl) values. We suggest that demanding that M^(2ν)_(cl) = 0 is a sensible alternative way, within the QRPA method, of determining the amount of renormalization of isoscalar particle-particle interaction strength g^(T=0)_(pp). Using such prescription, the matrix elements M^(0ν) are evaluated; their values are not very different (≤ 20%) from the usual QRPA values when g^(T=0)_(pp) is related to the known 2νββ half-lives. We note that vanishing values of M^(2ν)_(cl) are signs of a partial restoration of the spin-isospin SU(4) symmetry.
Published: 2018
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65. Bound-state double-<math><mi>β</mi></math> decay

Author: M. I. Krivoruchenko, Fedor Šimkovic, A. Babič, and Dušan Štefánik
Subjects: Physics, 010308 nuclear & particles physics, Continuous spectrum, Electron, 01 natural sciences, Spectral line, Daughter Ion, 0103 physical sciences, Bound state, High Energy Physics::Experiment, Atomic physics, 010306 general physics, Wave function, Energy (signal processing)
Abstract: We consider alternative modes of two-neutrino and neutrinoless double-β decays in which one β electron goes over to a continuous spectrum and the other occupies a vacant bound level of the daughter ion. We calculate the corresponding phase-space factors of the final states, estimate the partial decay rates, and derive the one- and two-electron energy spectra using relativistic many-electron wave functions of atoms provided by the multiconfiguration Dirac-Hartree-Fock package Grasp2K. While the bound-state neutrinoless double-β decays are strongly suppressed, their two-neutrino counterparts can be observed in the next-generation double-β-decay experiments, most notably SuperNEMO.
Published: 2018

66. Final results on $${}^\mathbf{82 }{\hbox {Se}}$$ double beta decay to the ground state of $${}^\mathbf{82 }{\hbox {Kr}}$$ from the NEMO-3 experiment

Author: Ph. Hubert, F. Nova, A. Basharina-Freshville, F. Piquemal, O.I. Kochetov, B. Morgan, A. S. Barabash, C. L. Riddle, G. Eurin, A. Remoto, D.V. Filosofov, H. Ohsumi, A. J. Caffrey, T. Le Noblet, Dominique Durand, S. I. Konovalov, R. Hodák, P. Přidal, R. Saakyan, F. Xie, N.I. Rukhadze, Michele Cascella, R. L. Flack, B. Guillon, S. Calvez, Karol Lang, X.R. Liu, P. Loaiza, Jouni Suhonen, Jose Busto, P. Guzowski, Y. Lemière, S. Jullian, C.S. Sutton, Ch. Marquet, C. Macolino, C. Hugon, Karel Smolek, A. A. Klimenko, A. Chopra, Z. J. Liptak, A.A. Smolnikov, Yu. Shitov, B. Soulé, C. Vilela, A. Chapon, J. L. Reyss, Lukas Fajt, X. Sarazin, V.E. Kovalenko, R. B. Pahlka, F. Perrot, F. Mauger, Fedor Šimkovic, Guillaume Lutter, J. J. Evans, D. Lalanne, Igor Nemchenok, F. Nowacki, C. Augier, J. Mott, Y. A. Ramachers, S. Blot, G. Szklarz, M. Bongrand, J. C. Thomas, A. Huber, J.P. Cesar, S. Torre, F. Mamedov, I. Vanushin, V. I. Tretyak, C. Cerna, D. Boursette, V. V. Timkin, D. Waters, L. Dawson, D. Duchesneau, V.I. Umatov, C. Patrick, X. Garrido, Vl. I. Tretyak, V. Brudanin, S. Söldner-Rembold, R. Salazar, R. Arnold, A. Smetana, A. Žukauskas, H. Gómez, E. Chauveau, Pavel P. Povinec, Masaharu Nomachi, L. Simard, V. G. Egorov, E. Rukhadze, Vit Vorobel, S. Blondel, and I. Stekl
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, 01 natural sciences, Lepton number, MAJORANA, Double beta decay, 0103 physical sciences, Beta (velocity), Neutrino Ettore Majorana Observatory, Neutrino, 010306 general physics, Ground state, Engineering (miscellaneous), Majoron
Abstract: Using data from the NEMO-3 experiment, we have measured the two-neutrino double beta decay ( $2\nu \beta \beta $ ) half-life of$^{82}$ Se as $T_{\smash {1/2}}^{2\nu } \!=\! \left[ 9.39 \pm 0.17\left( \text{ stat }\right) \pm 0.58\left( \text{ syst }\right) \right] \times 10^{19}$ y under the single-state dominance hypothesis for this nuclear transition. The corresponding nuclear matrix element is $\left| M^{2\nu }\right| = 0.0498 \pm 0.0016$ . In addition, a search for neutrinoless double beta decay ( $0\nu \beta \beta $ ) using 0.93 kg of$^{82}$ Se observed for a total of 5.25 y has been conducted and no evidence for a signal has been found. The resulting half-life limit of $T_{1/2}^{0\nu } > 2.5 \times 10^{23} \,\text{ y } \,(90\%\,\text{ C.L. })$ for the light neutrino exchange mechanism leads to a constraint on the effective Majorana neutrino mass of $\langle m_{\nu } \rangle < \left( 1.2{-}3.0\right) \,\text{ eV }$ , where the range reflects $0\nu \beta \beta $ nuclear matrix element values from different calculations. Furthermore, constraints on lepton number violating parameters for other $0\nu \beta \beta $ mechanisms, such as right-handed currents, majoron emission and R-parity violating supersymmetry modes have been set.
Published: 2018
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67. Interpolating formula for the 0νββ -decay half-life in the case of light and heavy neutrino mass mechanisms

Author: M. I. Krivoruchenko, Fedor Šimkovic, Sergey Kovalenko, and A. Babič
Subjects: Physics, Particle physics, Isotope, 010308 nuclear & particles physics, Nuclear structure, Half-life, 01 natural sciences, Double beta decay, 0103 physical sciences, High Energy Physics::Experiment, Beta (velocity), Neutrino, Heavy neutrino, 010306 general physics
Abstract: We revisit the "interpolating formula" proposed in our previous publication. It allows one to calculate the neutrinoless double beta decay ($0\nu\beta\beta$-decay) half-life for arbitrary neutrino mass without involvement of the complicated results for nuclear matrix elements (NME) obtained within specific nuclear structure models. The formula derives from the finding that the value of a properly normalized ratio of the NMEs for the light and heavy neutrino mass mechanisms weakly depends on isotope. From this fact it follows, in particular, that the light and heavy neutrino mass mechanisms can hardly be distinguished in a model independent way searching for $0\nu\beta\beta$-decay of different nuclei. Here we show that this formula holds for all the known nuclear structure approaches. We give a mathematical justification of our results examining analytical properties of the NMEs. We also consider several simplified benchmark scenarios within left-right symmetric models and analyze the conditions for the dominance of the light or heavy neutrino mass mechanisms in $0\nu\beta\beta$-decay.
Published: 2018
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68. 0νββ -decay nuclear matrix element for light and heavy neutrino mass mechanisms from deformed quasiparticle random-phase approximation calculations for Ge76, Se82, Te130, Xe136 , and Nd150 with isospin restoration

Author: Fedor Šimkovic, Amand Faessler, and Dong-Liang Fang
Subjects: Physics, Isotope, 010308 nuclear & particles physics, Nuclear Theory, 01 natural sciences, Beta decay, Nuclear physics, Isospin, Double beta decay, 0103 physical sciences, Quasiparticle, Neutrino, Nuclear Experiment, 010306 general physics, Nucleon, Random phase approximation
Abstract: In this work, with restored isospin symmetry, we evaluated the neutrinoless double beta decay nuclear matrix elements for $^{76}$Ge, $^{82}$Se, $^{130}$Te, $^{136}$Xe and $^{150}$Nd for both the light and heavy neutrino mass mechanisms using the deformed QRPA approach with realistic forces. We give detailed decompositions of the nuclear matrix elements over different intermediate states and nucleon pairs, and discuss how these decompositions are affected by the model space truncations. Compared to the spherical calculations, our results show reductions from $30\%$ to about $60\%$ of the nuclear matrix elements for the calculated isotopes mainly due to the presence of BCS overlap factor between the initial and final ground states. The comparison between different nucleon-nucleon forces with corresponding Short-Range-Correlations (src) shows, that the choice of the NN force gives roughly $20\%$ deviations for light exchange neutrino mechanism and much larger deviations for the heavy neutrino exchange mechanism.
Published: 2018
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69. BAIKAL-GVD: The New-Generation Neutrino Telescope in Lake Baikal

Author: R. R. Mirgazov, E. A. Osipova, K.V. Golubkov, N. M. Budnev, Lukas Fajt, V. A. Kozhin, I. A. Belolaptikov, Konstantin Kebkal, A.V. Skurichin, D. P. Petukhov, M.M. Kolbin, M.B. Milenin, S.V. Fialkovsky, Aleksandr Gafarov, A.P. Korobchenko, K.V. Konischev, E.V. Khramov, B. Shoibonov, G.B. Safronov, Rastislav Dvornický, A. V. Zagorodnikov, A.V. Avrorin, Fedor Šimkovic, R. Bannash, V.D. Rushay, V. M. Aynutdinov, T.I. Gres, Sergey Yakovlev, M.N. Sorokovikov, A. A. Doroshenko, V.A. Tabolenko, Z. Honz, Evgenii V Rjabov, A.D. Avrorin, V. B. Brudanin, V.F. Kulepov, Valery Zurbanov, A.P. Koshechkin, G.V. Domogatsky, A. I. Panfilov, Zh.-A.M. Dzhilkibaev, Olga Suvorova, O.G. Kebkal, M.I. Rozanov, A.G. Solovjev, L. V. Pankov, B.A. Tarashansky, E.N. Pliskovsky, I. Shtekl, A. N. Dyachok, D.A. Kuleshov, and Mark Shelepov
Subjects: 010302 applied physics, Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Cherenkov detector, Astrophysics::High Energy Astrophysical Phenomena, Neutrino telescope, Astrophysics::Instrumentation and Methods for Astrophysics, General Physics and Astronomy, Astronomy, 01 natural sciences, law.invention, Telescope, law, 0103 physical sciences, High Energy Physics::Experiment, Underwater
Abstract: The 1-cubic km deep Baikal-GVD underwater Cherenkov detector, a new-generation neutrino telescope, is now being deployed in Lake Baikal. The telescope’s status is described and the first physical results from its operation are presented.
Published: 2019
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70. A search for double-electron capture of 74Se to excited levels using coincidence/anticoincidence gamma-ray spectrometry

Author: Fedor Šimkovic, J. H. Thies, I. Sýkora, J. Stanicek, M. Ješkovský, D. Frekers, Pavel P. Povinec, P. Puppe, and A. Kováčik
Subjects: Physics, Nuclear and High Energy Physics, Spectrometer, Physics::Instrumentation and Detectors, Electron capture, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Mass spectrometry, Coincidence, Semiconductor detector, Nuclear physics, Excited state, Neutrino, Atomic physics, Nuclear Experiment, Instrumentation
Abstract: Evaluation of single, coincidence and anticoincidence gamma-ray spectrometry methods has been carried out with the aim to search for double-electron capture of 74Se to excited states. This process is unique, because there is probability for transition to the 2+ excited state in 74Ge (1204 keV), and de-excitation through two gamma-quanta cascade with energies of 595.9 keV and 608.4 keV. Long-term measurements with an anticosmic shielded HPGe (high purity Ge) spectrometer and a coincidence HPGe–NaI(Tl) spectrometer did not show any evidence for the double-electron capture in 74Se. The best limit for the half-life of the double electron capture in 74Se (both for the neutrinoless and two neutrino processes) was estimated to be >1.5×1019 yr.
Published: 2015
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71. Longitudinal component of the weak vector current of spin-1/2 nuclear isodoublets

Author: Fedor Šimkovic, Sergey Kovalenko, and M. I. Krivoruchenko
Subjects: Physics, Nuclear and High Energy Physics, Radiation, High Energy Physics::Phenomenology, Nuclear Theory, Form factor (quantum field theory), Vertex function, Atomic and Molecular Physics, and Optics, Charge radius, Isospin, Quantum electrodynamics, Effective field theory, Radiology, Nuclear Medicine and imaging, Symmetry breaking, Nuclear Experiment, Nucleon, Spin-½
Abstract: The generalized Ward identity is derived for the vertex function of the weak vector current (VC) of nucleons within an effective theory with account of the isotopic symmetry breaking. The generalized Ward identity establishes a relationship between the form factor of the longitudinal weak VC component and the mass difference and the charge radii of an isotopic doublet on the mass shell. This relationship can be used to evaluate the form factors of both nucleons and nuclei with spin J = 1/2 and isospin I = 1/2. The reactions with large transferred momenta involving isotopic doublets, in which the mass splitting is maximized, offer the greatest promise for measuring the form factor. Numerical estimates of the form factor of the longitudinal weak VC component of a nucleon pair and eight nuclear isodoublets are presented.
Published: 2015
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72. Neutrinoless double beta decay: Theoretical challenges

Author: Fedor Šimkovic
Subjects: Nuclear physics, Physics, Coupling constant, Nuclear and High Energy Physics, Particle physics, MAJORANA, Double beta decay, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Beta decay
Abstract: The recent progress in theoretical description of the neutrinoless double beta decay (0 νββ -decay) is briefly reviewed. A possible effect of nuclear medium on exchange of three light neutrinos is addressed. It is shown that non-standard neutrino interaction generates in-medium Majorana neutrino masses, which influences the 0 νββ -decay rate. A subject of interest is also a problem of reliable calculation of the 0 νββ -decay nuclear matrix elements. An impact of the quenching of the axial-vector coupling constant on double beta decay processes is discussed. A connection between two-neutrino and neutrinoless double beta decay nuclear matrix elements is analyzed.
Published: 2015
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73. Consequence of total lepton number violation in strongly magnetized iron white dwarfs

Author: M. Tater, E. Truhlík, V. B. Belyaev, Fedor Šimkovic, J. Adam, and P. Ricci
Subjects: Antiparticle, Nuclear and High Energy Physics, Nuclear Theory, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, Electron, Nuclear Theory (nucl-th), High Energy Physics - Phenomenology (hep-ph), Positron, Pulsar, Astrophysics::Solar and Stellar Astrophysics, Nuclear Experiment, Solar and Stellar Astrophysics (astro-ph.SR), Physics, White dwarf, Fermion, Lepton number, Degenerate matter, Magnetic field, High Energy Physics - Phenomenology, Astrophysics - Solar and Stellar Astrophysics, Antimatter, Physics::Accelerator Physics, High Energy Physics::Experiment, Fermi gas, Lepton
Abstract: The influence of neutrinoless electron to positron conversion on cooling of strongly magnetized iron white dwarfs is studied. It is shown that they can be good candidates for soft gamma-ray repeaters and anomalous X-ray pulsars., Comment: published version, 32 pages, 6 tables, 1 figure
Published: 2015
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74. Gigaton Volume Detector in Lake Baikal: status of the project

Author: V. A. Kozhin, M.B. Milenin, K.V. Golubkov, Mark Shelepov, Evgenii V Rjabov, I. A. Danilchenko, K.V. Konischev, Aleksandr Gafarov, Olga Suvorova, G.B. Safronov, A. I. Panfilov, Zdenek Hons, B.A. Tarashansky, D.A. Kuleshov, R. Bannash, Rastislav Dvornický, Aleksandr Valentinovich Avrovin, L. V. Pankov, G.V. Domogatsky, A.D. Avrorin, F.K. Koshel, R. R. Mirgazov, Aleksey Zagorodnikov, Ivan Štekl, O.G. Kebkal, V.F. Kulepov, M.I. Rozanov, E. A. Osipova, B.A. Shaybonov, V.A. Tabolenko, Valery Zurbanov, A. A. Doroshenko, A. N. Dyachok, A.P. Koshechkin, S.V. Fialkovsky, Fedor Šimkovic, E.N. Pliskovsky, A.V. Korobchenko, Zhan Dzhilkibaev, N. M. Budnev, I. A. Belolaptikov, Sergey Yakovlev, Konstantin Kebkal, V.B. Brudanin, D. P. Petukhov, V.M. Aynutdinov, T. I. Gress, Lukas Fajt, A.V. Skurihin, and M.M. Kolbin
Subjects: Nuclear physics, Physics, Neutrino detector, Neutrino telescope, Detector, Cluster (physics), Volume (compression)
Abstract: Baikal-GVD is a kilometer-scale neutrino telescope under construction in Lake Baikal, which will be formed by multi-megaton subarrays – clusters of strings. A first demonstration cluster “Dubna” has been deployed in 2015 and comprises 192 optical modules (OMs). In 2016 this cluster was upgraded to the baseline configuration which comprises 288 OMs arranged at eight strings. The second full-scale GVD-cluster was deployed and put in operation in 2017. We review the present activity towards the GVD implementation and discuss some selected results obtained with the “Dubna” cluster.
Published: 2018
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75. Improved description of the 2νββ -decay and a possibility to determine the effective axial-vector coupling constant

Author: Amand Faessler, Dušan Štefánik, Rastislav Dvornický, and Fedor Šimkovic
Subjects: Coupling constant, Physics, Electron energy, 010308 nuclear & particles physics, Electron, 01 natural sciences, Isospin, 0103 physical sciences, Quasiparticle, Atomic physics, 010306 general physics, Wave function, Pseudovector, Lepton
Abstract: An improved formalism of the two-neutrino double-beta decay ($2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$-decay) rate is presented, which takes into account the dependence of energy denominators on lepton energies via the Taylor expansion. Until now, only the leading term in this expansion has been considered. The revised $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$-decay rate and differential characteristics depend on additional phase-space factors weighted by the ratios of $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$-decay nuclear matrix elements with different powers of the energy denominator. For nuclei of experimental interest all phase-space factors are calculated by using exact Dirac wave functions with finite nuclear size and electron screening. For isotopes with measured $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$-decay half-life the involved nuclear matrix elements are determined within the quasiparticle random-phase approximation with partial isospin restoration. The importance of correction terms to the $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$-decay rate due to Taylor expansion is established and the modification of shape of single and summed electron energy distributions is discussed. It is found that the improved calculation of the $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$-decay predicts slightly suppressed $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$-decay background to the neutrinoless double-beta decay signal. Furthermore, an approach to determine the value of effective weak-coupling constant in nuclear medium ${g}_{\mathrm{A}}^{\mathrm{eff}}$ is proposed.
Published: 2018
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76. Two neutrino double-beta decay and effective axial-vector coupling constant

Author: Fedor Šimkovic, Dušan Štefánik, and Rastislav Dvornický
Subjects: Semileptonic decay, Coupling constant, Physics, Particle physics, 010308 nuclear & particles physics, QC1-999, High Energy Physics::Phenomenology, Context (language use), 01 natural sciences, Lepton number, MAJORANA, Double beta decay, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, 010306 general physics, Pseudovector
Abstract: The theoretical and experimental study of the two-neutrino double-beta decay (2νββ-decay) is of crucial importance for reliable calculation of matrix elements governing the neutrinoless double-beta decay (0νββ-decay). That will allow to determine masses of neutrinos once the 0νββ-decay, which occurs if the neutrino is a massive Majorana particle and the total lepton number is not onserved, will be observed. Experiments studying the 2νββ-decay are currently approaching a qualitatively new level, where high-precision measurements are performed not only for half-lives but for all other observables of the process. In this context an improved formula for the 2νββ-decay is presented. Further, a novel approach for determining the effective axial-vector coupling constant is proposed.
Published: 2018

77. Baikal-GVD: status and prospects

Author: G.V. Domogatsky, D. P. Petukhov, V. A. Kozhin, Mark Shelepov, M.N. Sorokovikov, K.V. Konischev, M.B. Milenin, V.F. Kulepov, A. I. Panfilov, T.I. Gres, A.P. Koshechkin, O.G. Kebkal, Fedor Šimkovic, M.I. Rozanov, K.V. Golubkov, A. A. Doroshenko, Zh.-A.M. Dzhilkibaev, A.G. Solovjev, E.N. Pliskovsky, B. Shoibonov, E. A. Osipova, A.V. Avrorin, A.D. Avrorin, D.A. Kuleshov, G.B. Safronov, Lukas Fajt, B.A. Tarashansky, Rastislav Dvornický, R. Bannash, M.M. Kolbin, E.V. Khramov, S.V. Fialkovsky, Sergey Yakovlev, N. M. Budnev, Z. Honz, V.A. Tabolenko, V.D. Rushay, Aleksandr Gafarov, V.M. Aynutdinov, A. V. Zagorodnikov, Valery Zurbanov, Evgenii V Rjabov, A.P. Korobchenko, I. A. Belolaptikov, Konstantin Kebkal, I. Shtekl, V.B. Brudanin, R. R. Mirgazov, A. N. Dyachok, Olga Suvorova, and L. V. Pankov
Subjects: Physics, 010308 nuclear & particles physics, QC1-999, Neutrino telescope, Astronomy, 01 natural sciences, Massless particle, Neutrino detector, 0103 physical sciences, Cluster (physics), Russian federation, Neutrino, 010306 general physics, Lepton
Abstract: Baikal-GVD is a next generation, kilometer-scale neutrino telescope under construction in Lake Baikal. It is designed to detect astrophysical neutrino fluxes at energies from a few TeV up to 100 PeV. GVD is formed by multi-megaton subarrays (clusters). The array construction started in 2015 by deployment of a reduced-size demonstration cluster named "Dubna" . The first cluster in it’s baseline configuration was deployed in 2016, the second in 2017 and the third in 2018. The full-scale GVD will be an array of ~10.000 light sensors with an instrumented volume about of 2 cubic km. The first phase (GVD-1) is planned to be completed by 2020-2021. It will comprise 8 clusters with 2304 light sensors in total. We describe the design of Baikal-GVD and present selected results obtained in 2015 - 2017.
Published: 2018

78. Data management and processing system for the Baikal-GVD telescope

Author: Valery Zurbanov, R. R. Mirgazov, Fedor Šimkovic, A.D. Avrorin, I. A. Belolaptikov, M.B. Milenin, Konstantin Kebkal, A. I. Panfilov, T. I. Gress, O.G. Kebkal, Olga Suvorova, Lukas Fajt, Sergey Yakovlev, Mark Shelepov, A.V. Skurihin, M.I. Rozanov, R. Bannash, L. V. Pankov, Evgenii V Rjabov, I. A. Danilchenko, M.M. Kolbin, Aleksandr Gafarov, K.V. Konischev, Zdenek Hons, V.A. Tabolenko, K.V. Golubkov, A. A. Doroshenko, B.A. Tarashansky, V.M. Aynutdinov, V. A. Kozhin, D. P. Petukhov, Aleksandr Valentinovich Avrovin, G.V. Domogatsky, Aleksey Zagorodnikov, S.V. Fialkovsky, B.A. Shaybonov, E.N. Pliskovsky, V.B. Brudanin, A. N. Dyachok, Ivan Štekl, V.F. Kulepov, A.P. Koshechkin, A.V. Korobchenko, E. A. Osipova, G.B. Safronov, Rastislav Dvornický, Zhan Dzhilkibaev, N. M. Budnev, D.A. Kuleshov, and F.K. Koshel
Subjects: Telescope, Flexibility (engineering), Software, business.industry, law, Event (computing), Data management, Real-time computing, Point (geometry), Event loop, Raw data, business, law.invention
Abstract: The Baikal-GVD neutrino telescope is being constructed in lake Baikal. The robust Baikal Analysis and Reconstruction Software (BARS) has been developed to convert raw data into physics results. To provide a stable and continuous analysis of all the data an automatic data processing using database is developed. The flexibility of the concept makes it easy to add new steps at any point of the analysis chain. The software is ROOT based collection of C++ classes driven by a central event loop. Now the basic algorithms have been implemented in the system such as event building, signal extraction, background rejection and simple reconstruction.
Published: 2017
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79. Baikal-GVD: Time Calibrations in 2016

Author: Aleksandr Gafarov, A.P. Koshechkin, Evgenii V Rjabov, B.A. Shaybonov, V.F. Kulepov, Fedor Šimkovic, A. N. Dyachok, N. M. Budnev, M.B. Milenin, I. A. Danilchenko, A.V. Korobchenko, V.M. Aynutdinov, Zdenek Hons, Mark Shelepov, A. A. Doroshenko, I. A. Belolaptikov, Konstantin Kebkal, A.D. Avrorin, E. A. Osipova, B.A. Tarashansky, D.A. Kuleshov, Valery Zurbanov, F.K. Koshel, Zhan Dzhilkibaev, O V Surovova, A. I. Panfilov, K.V. Konischev, Sergey Yakovlev, Anatoly Kozhin, A.V. Avrorin, O.G. Kebkal, M.I. Rozanov, Aleksey Zagorodnikov, E.N. Pliskovsky, G.B. Safronov, Rastislav Dvornický, L. V. Pankov, G.V. Domogatsky, K.V. Golubkov, D. P. Petukhov, S.V. Fialkovsky, Ivan Štekl, R. Bannash, V.A. Tabolenko, T. I. Gress, Lukas Fajt, A.V. Skurihin, M.M. Kolbin, V.B. Brudanin, and R. R. Mirgazov
Subjects: Neutrino telescope, Detector, Calibration, Cluster (physics), Volume (computing), Environmental science, Angular resolution, Effective volume, Remote sensing
Abstract: In April 2015, the first part (cluster) of the newly constructed next-generation neutrino telescope, Gigaton Volume Detector (GVD), was put into operation in the lake Baikal and started with data taking followed by another cluster installed in April 2017 thus doubling the number of installed Optical Modules (OMs) and instrumented volume. Moreover, the substantial extension of this detector is planned in the next few years. Specifically, another two clusters are going to be installed every consecutive year. In total 8 clusters consisting of 2304 OMs with overall effective volume ~0.4 km3 is going to be deployed by 2020. The vital condition for high angular resolution of reconstructed tracks of particles detected in GVD is a precise timing of individual channels which can be achieved with specialized time calibration systems. In this article, the different light sources and procedures used for time calibration of the GVD in the past as well as the newly developed ones are described and the results of the 2016 time calibration of the cluster Dubna are presented, especially the precision of intra and intersection calibrations and variations of calibration parameters in time.
Published: 2017
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80. Calibration and monitoring units of the Baikal-GVD neutrino telescope

Author: K.V. Golubkov, Evgenii V Rjabov, E. A. Osipova, A. A. Doroshenko, A.V. Korobchenko, A.V. Avrorin, M.B. Milenin, I. A. Belolaptikov, G.V. Domogatsky, Aleksey Zagorodnikov, Konstantin Kebkal, B.A. Shaybonov, Mark Shelepov, D.A. Kuleshov, A. N. Dyachok, Aleksandr Gafarov, Ivan Štekl, E.N. Pliskovsky, F.K. Koshel, A.V. Kozhin, V.M. Aynutdinov, Olga Suvorova, L. V. Pankov, B.A. Tarashansky, T. I. Gress, S.V. Fialkovsky, A.P. Koshechkin, D. P. Petukhov, Lukas Fajt, N. M. Budnev, A.V. Skurihin, A.D. Avrorin, Fedor Šimkovic, A. I. Panfilov, M.M. Kolbin, O.G. Kebkal, M.I. Rozanov, R. Bannash, Sergey Yakovlev, Z. Honz, V.A. Tabolenko, K.V. Konischev, Zhan Dzhilkibaev, Valery Zurbanov, R. R. Mirgazov, G.B. Safronov, Rastislav Dvornický, V.B. Brudanin, I. A. Danilchenko, and V.F. Kulepov
Subjects: Physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, System of measurement, Neutrino telescope, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Calibration, Neutrino astronomy, Neutrino, Charged particle, Cherenkov radiation, Remote sensing
Abstract: The Baikal-GVD is a cubic kilometer scale neutrino telescope which is deployed in Lake Baikal, that will perform neutrino astronomy studies. It consists of sub-arrays - clusters of about 300 optical modules each, that detect the Cherenkov light radiated by charged particles induced by neutrino interactions with the surrounding medium. The performance of the neutrino telescope relies on the precise timing and positioning calibration of the detector elements, continuous control and monitoring of a behavior of measuring systems, as well as environmental conditions which may affect light detection and event selection. This contribution describes the units which are used in GVD for calibration and monitoring purposes.
Published: 2017
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81. Search for cascade events with Baikal-GVD demonstration cluster 'Dubna'

Author: A. A. Doroshenko, A. I. Panfilov, O.G. Kebkal, D.A. Kuleshov, M.I. Rozanov, B.A. Shaybonov, F.K. Koshel, V.F. Kulepov, Zdenek Hons, A. N. Dyachok, K.V. Konischev, D. P. Petukhov, Aleksandr Valentinovich Avrovin, M.B. Milenin, I. A. Belolaptikov, Konstantin Kebkal, Olga Suvorova, Aleksandr Gafarov, R. Bannash, K.V. Golubkov, Sergey Yakovlev, L. V. Pankov, A.P. Koshechkin, Aleksey Zagorodnikov, N. M. Budnev, V.A. Tabolenko, A.D. Avrorin, Fedor Šimkovic, R. R. Mirgazov, G.V. Domogatsky, V.M. Aynutdinov, Ivan Štekl, V. A. Kozhin, G.B. Safronov, Evgenii V Rjabov, Rastislav Dvornický, A.V. Korobchenko, T. I. Gress, Mark Shelepov, Lukas Fajt, V.B. Brudanin, A.V. Skurihin, E. A. Osipova, M.M. Kolbin, E.N. Pliskovsky, Valery Zurbanov, Zhan Dzhilkibaev, I. A. Danilchenko, B.A. Tarashansky, and S.V. Fialkovsky
Subjects: Cascade, Neutrino telescope, Cluster (physics), Underwater, Geology, Remote sensing
Abstract: Deep underwater neutrino telescope „Dubna“ – the first, demonstration cluster of Baikal-GVD, has been deployed in April 2015 and was operating up to February 2016 in Lake Baikal. In 2016 this array was upgraded to baseline configuration of GVD-cluster by adding additional 96 optical modules. The next step of array extension was provided in 2017 by deployment of second GVD-cluster in Lake Baikal. We present here preliminary results of a search for cascade events using data sample recorded in 2015 by Dubna array and corresponding to 41 live days of data taking.
Published: 2017
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82. Search for Neutrinoless Quadruple- β Decay of Nd150 with the NEMO-3 Detector

Author: A. Smetana, A. Žukauskas, V. G. Egorov, R. Saakyan, X. Sarazin, E. Rukhadze, R. Salazar, S. Calvez, Vit Vorobel, F. Nova, D. Waters, O.I. Kochetov, J. J. Evans, D. Lalanne, S. Blot, Vl.I. Tretyak, A.J. Caffrey, B. Morgan, S. Söldner-Rembold, A. Huber, B. Guillon, E. Chauveau, J. Busto, J. C. Thomas, L. Dawson, Masaharu Nomachi, C. L. Riddle, A. Remoto, P. Loaiza, V. I. Tretyak, V. V. Timkin, C. Cerna, C. Augier, R. Arnold, C. Vilela, R. Hodák, A. Basharina-Freshville, H. Ohsumi, C.S. Sutton, T. Le Noblet, Dominique Durand, X.R. Liu, Guillaume Lutter, D. Duchesneau, Hector Gomez, Fedor Šimkovic, Karol Lang, A. S. Barabash, Y. A. Ramachers, Igor Nemchenok, Michele Cascella, Jouni Suhonen, J. Mott, D.V. Filosofov, F. Xie, Karel Smolek, Frédéric Nowacki, Pavel P. Povinec, D. Štefánik, Ch. Marquet, P. Přidal, I. Stekl, X. Garrido, B. Soulé, F. Perrot, J.P. Cesar, A.A. Smolnikov, S. Torre, Yu. Shitov, V.I. Umatov, F. Mamedov, F. Piquemal, V.E. Kovalenko, F. Mauger, D. Boursette, G. Szklarz, G. Eurin, M. Macko, C. Macolino, C. Hugon, R. L. Flack, J. L. Reyss, R. B. Pahlka, S. Blondel, C. Patrick, A. A. Klimenko, M. Bongrand, V.B. Brudanin, I. Vanushin, L. Fajt, P. Guzowski, Y. Lemière, A. Chapon, L. Simard, A. Chopra, Z. J. Liptak, Ph. Hubert, S. Jullian, and S. I. Konovalov
Subjects: Physics, Particle physics, Electron energy spectrum, 010308 nuclear & particles physics, Detector, General Physics and Astronomy, chemistry.chemical_element, Electron, 01 natural sciences, 7. Clean energy, Neodymium, Lepton number, Beta decay, Nuclear physics, chemistry, 0103 physical sciences, Underground laboratory, 010306 general physics
Abstract: We report the results of a first experimental search for lepton number violation by four units in the neutrinoless quadruple-β decay of Nd150 using a total exposure of 0.19 kg yr recorded with the NEMO-3 detector at the Modane Underground Laboratory. We find no evidence of this decay and set lower limits on the half-life in the range T1/2>(1.1–3.2)×1021 yr at the 90% C.L., depending on the model used for the kinematic distributions of the emitted electrons.
Published: 2017
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83. Nuclear structure dependence of the coherent (μ-,e-) conversion matrix elements

Author: J. D. Vergados, T. S. Kosmas, Amand Faessler, and Fedor Šimkovic
Subjects: Matrix (mathematics), Materials science, Nuclear Theory, Nuclear structure, Nuclear Experiment, Molecular physics
Abstract: Coherent rates for the neutrinoless muon to electron conversion. (μ-, e-) in the presence of nuclei, are studied throughout the periodic table. The relevant ground state to ground state transition matrix elements are obtained in the context of the quasi-particle RPA. The results are discussed in view of the existing experimental data extracted at TRIUMF and PSI for 48Ti and 208Pb nuclei and compared with: (i) the single particle shell model results calculated with a determinantal ground state wave function and (ii) the results deduced in a local density approximation.
Published: 2020
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84. The Electron Capture $$^{163}$$ 163 Ho Experiment ECHo

Author: Susanta Lahiri, Christian Enss, Amand Faessler, Moumita Maiti, A. Doerr, Ch. E. Düllmann, M. Wegner, Klaus Blaum, Sebastian Kempf, M. I. Krivoruchenko, Sergey Eliseev, Fedor Šimkovic, Loredana Gastaldo, P. C. O. Ranitzsch, Achim Fleischmann, Klaus Eberhardt, Z. Szusc, and Yu. N. Novikov
Subjects: Physics, Physics::Instrumentation and Detectors, Electron capture, Electron, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Calorimeter, Nuclear physics, General Materials Science, Production (computer science), Sensitivity (control systems), Neutrino, Absolute scale, Electron neutrino
Abstract: The determination of the absolute scale of the neutrino masses is one of the most challenging present questions in particle physics. The most stringent limit, $$m(\bar{\nu }_{\mathrm {e}})< 2$$ eV, was achieved for the electron anti-neutrino mass. Different approaches are followed to reach a sensitivity on neutrino masses in the sub-eV range. Among them, experiments exploring the beta decay or electron capture of suitable nuclides can provide information on the electron neutrino mass value. We present the electron capture $$^{163}$$ Ho experiment ECHo, which aims to investigate the electron neutrino mass in the sub-eV range by means of the analysis of the calorimetrically measured energy spectrum following electron capture in $$^{163}$$ Ho. A high precision and high statistics spectrum will be measured with arrays of metallic magnetic calorimeters. We discuss some of the essential aspects of ECHo to reach the proposed sensitivity: detector optimization and performance, multiplexed readout, $$^{163}$$ Ho source production and purification, as well as a precise theoretical and experimental parameterization of the calorimetric EC spectrum including in particular the value of $$Q_{\mathrm {EC}}$$ . We present preliminary results obtained with a first prototype of single channel detectors as well as a first 64-pixel chip with integrated micro-wave SQUID multiplexer, which will already allow to investigate $$m(\nu _{\mathrm {e}})$$ in the eV range.
Published: 2014
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85. Theory of neutrinoless double beta decay—A brief review

Author: Fedor Šimkovic
Subjects: Physics, Nuclear and High Energy Physics, Sterile neutrino, Particle physics, Radiation, High Energy Physics::Phenomenology, Lepton number, Atomic and Molecular Physics, and Optics, MAJORANA, Double beta decay, Measurements of neutrino speed, CP violation, High Energy Physics::Experiment, Radiology, Nuclear Medicine and imaging, Neutrino, Neutrino oscillation
Abstract: Neutrinoless double decay (0νββ-decay) is a unique probe for lepton number conservation and neutrino properties. This is a process with long and interesting history with important implications for particle physics and cosmology, but its observation is still elusive. The search for the 0νββ-decay represents the new frontiers of neutrino physics, allowing to determine the Majorana nature of neutrinos and to fix the neutrino mass scale and possible CP violation effects, which could explain the matter-antimatter asymmetry in the Universe. At present a complete theory is missing and, thus, to motivate and guide the experiments the mechanism mediated by light neutrinos is mostly considered. The subject of interest is an effective mass of Majorana neutrinos, which can be deduced from the measured half-life, once this process is definitely observed. The accuracy of the determination of this quantity is mainly determined by our knowledge of the nuclear matrix elements. There is a request to evaluate them with high precision, accuracy and reliability. Recently, there is an increased interest to the resonant neutrinoless double electron capture, which may also establish the Majorana nature of neutrinos. This possibility is considered as alternative and complementary to searches for the 0νββ-decay.
Published: 2013
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86. Can one measure the Cosmic Neutrino Background?

Author: Amand Faessler, Rastislav Hodák, Sergey Kovalenko, and Fedor Šimkovic
Published: 2017
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87. Neutrinoless DBD mechanisms and NME

Author: Fedor Šimkovic, Dušan Štefánik, and Rastislav Dvornický
Published: 2017
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88. Nonlinear higher quasiparticle random phase approximation

Author: Dušan Štefánik, Mikhail Krivoruchenko, Adam Smetana, and Fedor Šimkovic
Subjects: Physics, Matrix (mathematics), Nonlinear system, Phonon, Truncation, Excited state, Quantum mechanics, Nuclear Theory, Quasiparticle, Nuclear Experiment, Random phase approximation, Harmonic oscillator
Abstract: We develop a new approach to describe nuclear states of multiphonon origin, motivated by the necessity for a more accurate description of matrix elements of neutrinoless double-beta decay. Our approach is an extension of the Quasiparticle Random Phase Approximation (QRPA), in which nonlinear phonon operators play an essential role. Before applying the nonlinear higher QRPA (nhQRPA) to realistic problems, we test its efficiency with exactly solvable models. The first considered model is equivalent to a harmonic oscillator. The nhQRPA solutions follow from the standard QRPA equation, but for nonlinear phonon operators defined for each individual excited state separately. The second exactly solvable model is the proton-neutron Lipkin model that describes successfully not only energy spectrum of nuclei, but also beta-decay transitions. Again, we reproduce exactly the numerical solutions in the nhQRPA framework. We show in particular that truncation of the nonlinear phonon operators leads to an approximation s...
Published: 2017
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89. Reactor antineutrino spectra and forbidden beta decays

Author: Fedor Šimkovic, Dušan Štefánik, and Rastislav Dvornický
Subjects: Nuclear physics, Physics, Beta (finance), Spectral line
Published: 2017
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90. The BiPo-3 detector

Author: L. Simard, S. Blot, M. Bongrand, H. Gómez, A. Chopra, Z. J. Liptak, Jose Busto, P. Guzowski, Y. Lemière, Y. A. Ramachers, S. I. Konovalov, E. Chauveau, F. Perrot, B. Richards, V. V. Timkin, V.I. Umatov, X. Garrido, E. Birdsall, Pavel P. Povinec, Masaharu Nomachi, L. Fajt, Vit Vorobel, S. Torre, P. Přidal, V. Brudanin, G. Eurin, F. Mamedov, A.J. Caffrey, S. Söldner-Rembold, D. Boursette, Ruben Saakyan, O.I. Kochetov, C. Vilela, X.R. Liu, F. Piquemal, C. Hugon, Guillaume Lutter, J. Mott, M. Macko, Karol Lang, A. Jeremie, A. Žukauskas, Karol Holý, Yu. Shitov, S. De Capua, Michele Cascella, V. G. Egorov, A.A. Smolnikov, E. Rukhadze, P. Loaiza, S. Calvez, D. Waters, X. Sarazin, Joleen Pater, A. Smetana, J. J. Evans, D. Duchesneau, A. S. Barabash, Juergen Thomas, S. Blondel, I. Stekl, A. Huber, C. Cerna, D.V. Filosofov, V. I. Tretyak, V.E. Kovalenko, F. Mauger, G. Oliviéro, Fedor Šimkovic, R. L. Flack, Igor Nemchenok, B. Guillon, H. Ohsumi, M. Kauer, T. Le Noblet, R. B. Pahlka, Dominique Durand, Vl.I. Tretyak, F. Nova, S. Jullian, B. Morgan, A. A. Klimenko, C. L. Riddle, A. Remoto, A. Basharina-Freshville, R. Hodák, Karel Smolek, B. Soulé, Ch. Marquet, Laboratoire de l'Accélérateur Linéaire (LAL), 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), 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), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique 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)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire Souterrain de Modane (LSM - UMR 6417), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), 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), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), and Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Photomultiplier, measurement methods, chemistry.chemical_element, Scintillator, 010403 inorganic & nuclear chemistry, 01 natural sciences, Bismuth, Nuclear physics, thallium, Optics, Neutrino Ettore Majorana Observatory, Double beta decay, Double beta-decay detectors, 0103 physical sciences, bismuth, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], background: radioactivity, FOIL method, scintillation counter, Physics, Radiation, photomultiplier, 010308 nuclear & particles physics, business.industry, Detector, double-beta decay, 0104 chemical sciences, chemistry, Scintillation counter, admixture, Low-radioactivity measurements, business
Abstract: The BiPo-3 detector is a low radioactive detector dedicated to measuring ultra-low natural contaminations of 208Tl and 214Bi in thin materials, initially developed to measure the radiopurity of the double β decay source foils of the SuperNEMO experiment at the μBq/kg level. The BiPo-3 technique consists in installing the foil of interest between two thin ultra-radiopure scintillators coupled to low radioactive photomultipliers. The design and performances of the detector are presented. In this paper, the final results of the 208Tl and 214Bi activity measurements of the first enriched 82Se foils are reported for the first time, showing the capability of the detector to reach sensitivities in the range of some μBq/kg.
Published: 2017
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91. Neutrino Mass, Electron Capture and the Shake-off Contributions

Author: Fedor Šimkovic, Loredana Gastaldo, and Amand Faessler
Subjects: Physics, Nuclear Theory, 010308 nuclear & particles physics, Electron capture, Electron rest mass, FOS: Physical sciences, Electron, 01 natural sciences, Nuclear Theory (nucl-th), Nuclear physics, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Decay energy, Excited state, Ionization, 0103 physical sciences, Atomic physics, Neutrino, 010306 general physics, Electron neutrino
Abstract: Electron capture can determine the electron neutrino mass, while the beta decay of Tritium measures the electron antineutrino mass and the neutrinoless double beta decay observes the Majorana neutrino mass. Electron capture e. g. on 163Ho plus bound electron to 163Dy* plus neutrino can determine the electron neutrino mass from the upper end of the decay spectrum of the excited Dy*, which is given by the Q-Value minus the neutrino mass. The Dy* states decay by X-ray and Auger electron emissions. The total decay energy is measured in a bolometer. These excitations have been studied by Robertson and by Faessler et al.. In addition the daughter atom Dy can also be excited by moving in the capture process one electron into the continuum. The escape of these continuum electrons is automatically included in the experimental bolometer spectrum. Recently a method developed by Intemann and Pollock was used by DeRujula and Lusignoli for a rough estimate of this shake-off process for "s" wave electrons in capture on 163Ho. The purpose of the present work is to give a more reliable description of "s" wave shake-off in electron capture on Holmium. For that one needs very accurate atomic wave functions of Ho in its ground state and excited atomic wave functions of Dy* including a description of the continuum electrons. In the present approach the wave functions of Ho and Dy* are determined selfconsistently with the antisymmetrized relativistic Dirac-Hartree-Fock approach. The relativistic continuum electron wave functions for the ionized Dy* are obtained in the corresponding selfconsistent Dirac-Hartree-Fock-Potential. In this improved approach shake-off can hardly be seen after electron capture in 163Ho and thus can probably not affect the determination of the electron neutrino mass., 20 pages, 9 figures
Published: 2016

92. Measurement of the double-beta decay half-life and search for the neutrinoless double-beta decay ofCa48with the NEMO-3 detector

Author: F. Nova, X.R. Liu, B. Morgan, C. L. Riddle, A. Remoto, Hector Gomez, Jouni Suhonen, S. Calvez, S. V. Zhukov, M. Bongrand, Masaharu Nomachi, A. Basharina-Freshville, F. Piquemal, O.I. Kochetov, J. Baker, Karol Lang, D. Waters, V. I. Tretyak, R. Salazar, Vl.I. Tretyak, Jose Busto, V. G. Egorov, S. Blondel, V. V. Timkin, Y. A. Ramachers, X. Sarazin, E. Rukhadze, B. Richards, P. Guzowski, Y. Lemière, V. I. Lebedev, Guillaume Lutter, A. M. Bakalyarov, J. L. Reyss, J.P. Cesar, S. Torre, F. Mamedov, V.E. Kovalenko, F. Mauger, Frédéric Nowacki, A. Chapon, Fedor Šimkovic, G. Szklarz, R. Arnold, Igor Nemchenok, A. Smetana, A. Chopra, Z. J. Liptak, C. Hugon, V. B. Brudanin, J. Mott, P. Loaiza, Michele Cascella, R. Saakyan, G. Eurin, F. Perrot, V. I. Umatov, R. B. Pahlka, I. Stekl, S. Söldner-Rembold, A. S. Barabash, S. Blot, D.V. Filosofov, L. Simard, Ch. Marquet, N.I. Rukhadze, A. Žukauskas, Ph. Hubert, Vit Vorobel, E. Chauveau, A.A. Smolnikov, R. L. Flack, J. J. Evans, A. A. Klimenko, S. Jullian, D. Lalanne, Yu. Shitov, A. Huber, J. C. Thomas, C. Cerna, Lukas Fajt, I. Vanushin, Pavel P. Povinec, C.S. Sutton, H. Ohsumi, T. Le Noblet, Dominique Durand, S. I. Konovalov, P. Přidal, A. J. Caffrey, R. Hodák, Karel Smolek, X. Garrido, B. Soulé, D. Duchesneau, C. Vilela, B. Guillon, and C. Augier
Subjects: Physics, Particle physics, 010308 nuclear & particles physics, Half-life, 01 natural sciences, Lower limit, Nuclear physics, MAJORANA, Double beta decay, 0103 physical sciences, Underground laboratory, Neutrino, 010306 general physics, Majoron
Abstract: The NEMO-3 experiment at the Modane Underground Laboratory has investigated the double-$\beta$ decay of $^{48}{\rm Ca}$. Using $5.25$ yr of data recorded with a $6.99\,{\rm g}$ sample of $^{48}{\rm Ca}$, approximately $150$ double-$\beta$ decay candidate events have been selected with a signal-to-background ratio greater than $3$. The half-life for the two-neutrino double-$\beta$ decay of $^{48}{\rm Ca}$ has been measured to be $T^{2\nu}_{1/2}\,=\,[6.4\, ^{+0.7}_{-0.6}{\rm (stat.)} \, ^{+1.2}_{-0.9}{\rm (syst.)}] \times 10^{19}\,{\rm yr}$. A search for neutrinoless double-$\beta$ decay of $^{48}{\rm Ca}$ yields a null result and a corresponding lower limit on the half-life is found to be $T^{0\nu}_{1/2} > 2.0 \times 10^{22}\,{\rm yr}$ at $90\%$ confidence level, translating into an upper limit on the effective Majorana neutrino mass of $ < 6.0 - 26$ ${\rm eV}$, with the range reflecting different nuclear matrix element calculations. Limits are also set on models involving Majoron emission and right-handed currents.
Published: 2016
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93. A possible probe of neutrinoless double-beta decay nuclear matrix elements

Author: S. M. Bilenky and Fedor Šimkovic
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, MAJORANA, Radiation, Double beta decay, Radiology, Nuclear Medicine and imaging, Nuclear matrix, Mass hierarchy, Signal, Atomic and Molecular Physics, and Optics
Abstract: Future experiments on the search for the 0νββ decay will be sensitive to the effective Majorana mass in the region of the inverted mass hierarchy. If a positive signal is observed, a possibility to test models of calculation of nuclear matrix elements of the process will appear. We discuss this possibility in some detail.
Published: 2012
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94. The nuclear matrix elements for double beta decay

Author: Fedor Šimkovic
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Double beta decay, Nuclear Theory, Quasiparticle, Nuclear shell model, High Energy Physics::Experiment, Nuclear matrix, Random phase approximation, Atomic and Molecular Physics, and Optics
Abstract: The status of the calculation of the neutrinoless double beta decay (0νββ-decay) nuclear matrix elements (NMEʼs) is reviewed. The spread of published values of NMEʼs is discussed. The main attention is paid to the recent progress achieved in the evaluation of the 0νββ-decay NMEʼs in the framework of the quasiparticle random phase approximation (QRPA). The obtained results are compared with those of the nuclear shell model. The problem of reliable determination of the 0νββ-decay NMEʼs is addressed. The uncertainty in NMEʼs are analyzed and further progress in calculation of the 0νββ-decay NMEʼs is outlined.
Published: 2011
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95. The 71Ga(3He, t) reaction and the low-energy neutrino response

Author: Pavel P. Povinec, Kichiji Hatanaka, T. Adachi, A. Okamoto, Fedor Šimkovic, G. Susoy, H. Okamura, R. G. T. Zegers, Hisanori Fujita, H. C. Kozer, B. A. Brown, M. Fujiwara, J. Van de Walle, P. Puppe, R. Hodak, J. H. Thies, Hidetoshi Akimune, M. Holl, Mohsen Harakeh, Takayoshi Suzuki, H. Ejiri, A. Lennarz, N. T. Khai, C. Iwamoto, V. N. Gavrin, Y. Fujita, E. Ganioglu, D. Frekers, E.-W. Grewe, Atsushi Tamii, B. Bilgier, Carol Guess, and B.T. Cleveland
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Electron capture, Solar neutrino, 01 natural sciences, 7. Clean energy, Nuclear physics, Neutrino detector, Excited state, 0103 physical sciences, GALLEX, Neutrino, 010306 general physics, Ground state, Charged current
Abstract: A 71Ga(3He, t)71Ge charge-exchange experiment was performed to extract with high precision the Gamow–Teller (GT) transition strengths to the three lowest-lying states in 71Ge, i.e., the ground state ( 1 / 2 − ) , the 175 keV ( 5 / 2 − ) and the 500 keV ( 3 / 2 − ) excited states. These are the relevant states, which are populated via a charged-current reaction induced by neutrinos from reactor-produced 51Cr and 37Ar sources. A precise measurement of the GT transition strengths is an important input into the calibration of the SAGE and GALLEX solar neutrino detectors and addresses a long-standing discrepancy between the measured and evaluated capture rates from the 51Cr and 37Ar neutrino calibration sources, which has recently spawned new ideas about unconventional neutrino properties.
Published: 2011
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96. Towards the detection of light and heavy relic neutrinos

Author: Amand Faessler, Fedor Šimkovic, Sergey Kovalenko, and Rastislav Hodak
Subjects: Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Neutrino decoupling, Solar neutrino problem, Cosmic neutrino background, Neutrino detector, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino astronomy, Neutrino
Abstract: The standard Big Bang cosmology predicts that the universe is abundantly populated with neutrinos. As expected there are at least 114 neutrinos per cubic centimeter averaged over the whole space. Like the cosmic background radiation the cosmic neutrinos at present posses a very small kinetic energy due to expansion of the universe. This prediction is one of the cornerstones of modern cosmology. On the other hand the existence of cosmic neutrinos has not yet been confirmed by direct detection experiments. For now we only have a lower limit on the total mass of this free floating ghostly gas of neutrinos, but even so it is roughly equivalent to the total mass of all the visible stars in universe. There could be many more neutrinos at Earth because of condensation of neutrinos, now moving slowly under the gravitational pull of our galaxy. Here we discuss the possibility of detection of relic neutrinos in KATRIN and MARE experiments via neutrino capture on tritium and rhenium, respectively. We also examine single and double relic neutrino capture on double β -decaying nuclei which might be relevant in the context of the new generation double beta decay experiments. Further we explore feasibility of experiments for detection of heavy sterile neutrinos with masses in MeV region, which may have important astrophysical and cosmological implications.
Published: 2011
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97. Neutrinoless double-beta decay and double-electron capture

Author: Fedor Šimkovic, M. I. Krivoruchenko, and Amand Faessler
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Electron capture, High Energy Physics::Phenomenology, Fermion, Lepton number, Ion, Nuclear physics, MAJORANA, Effective mass (solid-state physics), Double beta decay, High Energy Physics::Experiment, Neutrino
Abstract: The fundamental importance of searching for neutrinoless double-beta decay is widely recognized. Observation of the decay would tell us that the total lepton number is not conserved and that, consequently, neutrinos are massive Majorana fermions. The same statement could be made in the case of observing neutrinoless double-electron capture. We address the question of the sensitivity of the 0 ν e e decay to the effective mass of the Majorana neutrino. According to our estimates, in the case of 152Gd and 164Er the sensitivity can be comparable to the favored 0 ν β β decays of nuclei. The main uncertainty in the prediction of half-lives of the 0 ν e e decay stems from the lack of sufficient precision in measuring the mass difference between the parent and daughter atoms. More accurate measurements can be accomplished using the modern high-precision ion traps.
Published: 2011
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98. Spatial positioning of underwater components for Baikal- GVD

Author: Aleksandr Gafarov, A. V. Zagorodnikov, R. R. Mirgazov, Mark Shelepov, E.N. Pliskovsky, A.V. Skurichin, T.I. Gres, K.V. Golubkov, K.V. Konischev, R. Bannash, B.A. Shaybonov, V.F. Kulepov, D. P. Petukhov, Evgenii V Rjabov, A. N. Dyachok, A.D. Avrorin, V. A. Kozhin, V.A. Tabolenko, I. Shtekl, M.V. Kruglov, I. A. Belolaptikov, Konstantin Kebkal, Olga Suvorova, A.V. Avrorin, V.D. Rushay, S.V. Fialkovsky, V.M. Aynutdinov, M.N. Sorokovikov, M.K. Kryukov, V.B. Brudanin, A. I. Panfilov, B.A. Tarashansky, Lukas Fajt, A. A. Doroshenko, O.G. Kebkal, M.B. Milenin, M.I. Rozanov, M.M. Kolbin, A.V. Korobchenko, Zh.-A.M. Dzhilkibaev, V. Nazari, G.V. Domogatsky, A.G. Solovjev, G.B. Safronov, Rastislav Dvornický, N.S. Gorshkov, A.P. Koshechkin, E.V. Khramov, Sergey Yakovlev, Fedor Šimkovic, N. M. Budnev, and D.A. Kuleshov
Subjects: Spatial positioning, Positioning system, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Orientation (computer vision), Astrophysics::High Energy Astrophysical Phenomena, Physics, QC1-999, Detector, Neutrino telescope, Astrophysics::Instrumentation and Methods for Astrophysics, Geodesy, 01 natural sciences, Acceleration, Timing error, 0103 physical sciences, Underwater, 010306 general physics
Abstract: Baikal-GVD is a cubic kilometer-scale neutrino telescope currently under construction in Lake Baikal. The detector’s components are mobile and may drift from their initial coordinates or change their spatial orientation. This introduces a reconstruction error, particularly a timing error for PMT hits. This problem is mitigated by a combination of a hydroacoustic positioning system and per-component acceleration and orientation sensors. Under regular conditions, the average positioning accuracy for a GVD component is estimated to be less than 13 cm.
Published: 2019
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99. Luminescence of water in Lake Baikal observed with the Baikal-GVD neutrino telescope

Author: V.F. Kulepov, R. Bannash, Aleksandr Gafarov, T. I. Gress, I. Stekl, V.A. Tabolenko, A. V. Zagorodnikov, Lukas Fajt, Evgenii V Rjabov, A.V. Avrorin, B.A. Tarashansky, E.V. Khramov, M.M. Kolbin, A.V. Korobchenko, V. M. Aynutdinov, Sergey Yakovlev, D.A. Kuleshov, M.V. Kruglov, V.D. Rushay, A.D. Avrorin, V. Nazari, I. A. Belolaptikov, Konstantin Kebkal, R. R. Mirgazov, K.V. Golubkov, G.V. Domogatsky, M.N. Sorokovikov, A. A. Doroshenko, Zh.-A.M. Dzhilkibaev, Fedor Šimkovic, K.V. Konischev, A.P. Koshechkin, M.B. Milenin, V. A. Kozhin, B.A. Shaybonov, A. N. Dyachok, G.B. Safronov, Rastislav Dvornický, A. I. Panfilov, Olga Suvorova, O.G. Kebkal, M.I. Rozanov, S.V. Fialkovsky, M.K. Kryukov, A.G. Solovjev, N.S. Gorshkov, E.N. Pliskovsky, N. M. Budnev, D. P. Petukhov, Mark Shelepov, and V. B. Brudanin
Subjects: Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, QC1-999, Neutrino telescope, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, 01 natural sciences, 0103 physical sciences, 010306 general physics, Luminescence, Light field
Abstract: We present data on the luminescence of the Baikal water medium collected with the Baikal-GVD neutrino telescope. This three-dimensional array of light sensors allows the observation of time and spatial variations of the ambient light field. In 2016, we observed a maximum of luminescence activity between July and October.
Published: 2019
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100. Status of the Baikal-GVD Neutrino Telescope

Author: N. M. Budnev, A.V. Korobchenko, M.B. Milenin, A.V. Avrorin, Mark Shelepov, K.V. Konischev, R. Bannash, Lukas Fajt, V. A. Kozhin, A.V. Skurichin, M.M. Kolbin, B.A. Tarashansky, M.N. Sorokovikov, A. A. Doroshenko, D.A. Kuleshov, V.F. Kulepov, V.A. Tabolenko, E.V. Khramov, A. I. Panfilov, V.B. Brudanin, Zh.-A.M. Dzhilkibaev, R. R. Mirgazov, T.I. Gres, B.A. Shaybonov, A.P. Koshechkin, S.V. Fialkovsky, O.G. Kebkal, M.I. Rozanov, Fedor Šimkovic, V.D. Rushay, A. N. Dyachok, Sergey Yakovlev, K.V. Golubkov, V.M. Aynutdinov, V. Nazari, A.G. Solovjev, E.N. Pliskovsky, M.V. Kruglov, G.V. Domogatsky, D. P. Petukhov, Olga Suvorova, M.K. Kryukov, Aleksandr Gafarov, A. V. Zagorodnikov, I. Shtekl, A.D. Avrorin, G.B. Safronov, Rastislav Dvornický, I. A. Belolaptikov, Konstantin Kebkal, N.S. Gorshkov, and Evgenii V Rjabov
Subjects: Physics, Scale (ratio), Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Cherenkov detector, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Detector, Neutrino telescope, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, 01 natural sciences, law.invention, law, 0103 physical sciences, High Energy Physics::Experiment, Underwater, 010306 general physics
Abstract: Currently in Lake Baikal a new-generation neutrino telescope is being deployed: Baikal-GVD, a deep underwater Cherenkov detector on the cubic-kilometer scale. This paper presents the status of the detector implementation and the first physical results obtained with the existing configuration.
Published: 2019
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