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1. Search for Double Beta Decay of 106Cd with an Enriched 106CdWO4 Crystal Scintillator in Coincidence with CdWO4 Scintillation Counters

Author

Pierluigi Belli, R. Bernabei, V.B. Brudanin, F. Cappella, V. Caracciolo, R. Cerulli, F. A. Danevich, Antonella Incicchitti, D.V. Kasperovych, V.R. Klavdiienko, V.V. Kobychev, Vittorio Merlo, O.G. Polischuk, V.I. Tretyak, and M.M. Zarytskyy

Subjects
double beta decay, 106Cd, scintillation detector, low background experiment, Elementary particle physics, QC793-793.5
Abstract

Studies on double beta decay processes in 106Cd were performed by using a cadmium tungstate scintillator enriched in 106Cd at 66% (106CdWO4) with two CdWO4 scintillation counters (with natural Cd composition). No effect was observed in the data that accumulated over 26,033 h. New improved half-life limits were set on the different channels and modes of the 106Cd double beta decay at level of limT1/2∼1020−1022 yr. The limit for the two neutrino electron capture with positron emission in 106Cd to the ground state of 106Pd, T1/22νECβ+≥2.1×1021 yr, was set by the analysis of the 106CdWO4 data in coincidence with the energy release 511 keV in both CdWO4 counters. The sensitivity approaches the theoretical predictions for the decay half-life that are in the range T1/2∼1021−1022 yr. The resonant neutrinoless double-electron capture to the 2718 keV excited state of 106Pd is restricted at the level of T1/20ν2K≥2.9×1021 yr.

Published
2020
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2. Baikal-GVD Experiment

Author

M.N. Sorokovikov, A. N. Dyachok, R. Dvornicky, B. A. Shaibonov, E.N. Pliskovsky, K.V. Golubkov, Z. Bardačová, E. Eckerová, Olga Suvorova, A. A. Doroshenko, D. P. Petukhov, A. V. Skurikhin, Zh.-A.M. Dzhilkibaev, G.B. Safronov, T.I. Gres, Fedor Šimkovic, A. I. Panfilov, G.V. Domogatsky, O.G. Kebkal, A.D. Avrorin, M.I. Rozanov, V.B. Brudanin, M. K. Krjukov, E.V. Khramov, V. Ya. Dik, A.G. Solovjev, A.V. Avrorin, I. Stekl, R. Ivanov, V.A. Tabolenko, Lukas Fajt, A.V. Korobchenko, Mark Shelepov, R. R. Mirgazov, V. Nazari, I. A. Belolaptikov, D. N. Zaborov, A.P. Koshechkin, M.M. Kolbin, Konstantin Kebkal, Dmitry V. Naumov, K. V. Konishev, V.D. Rushay, V.M. Aynutdinov, N.S. Gorshkov, B. A. Taraschansky, Aleksandr Gafarov, M.B. Milenin, V.F. Kulepov, V. A. Kozhin, M. S. Katulin, R. Bannasch, S. A. Yakovlyev, S.V. Fialkovsky, E. O. Sushenok, Evgenii V Rjabov, N. M. Budnev, and M.V. Kruglov

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Detector, Phase (waves), Scale (descriptive set theory), 01 natural sciences, Atomic and Molecular Physics, and Optics, Nuclear physics, Neutrino detector, 0103 physical sciences, Neutrino, 010306 general physics, Effective volume
Abstract

Baikal-GVD is a deep-underwater neutrino detector of cubic-kilometer scale. It is designed to detect astrophysical neutrinos up to multi-PeV energies and beyond. The deployment of this facility began in spring 2015. Since April 2020, the detector includes seven clusters, each consisting of eight strings carrying in total 288 optical modules located at depths of 750 to 1275 m. By the end of the first phase of construction of the detector in 2024, it is planned to deploy 15 clusters, whereby an effective volume of 0.75 km $${}^{3}$$ for detecting high-energy cascades would be reached. The design and status of the Baikal-GVD detector are described in the present article along with selected results of data analysis.

Published
2020
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3. Search for double-beta decay of 106Cd

Author

O. G. Polischuk, R. Bernabei, D.V. Kasperovych, V. Caracciolo, V.B. Brudanin, V. Merlo, V. I. Tretyak, V. R. Klavdiienko, A. Incicchitti, V.V. Kobychev, R. Cerulli, M. M. Zarytskyy, P. Belli, F. Cappella, and F.A. Danevich

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, Settore FIS/04, Double-beta decay, General Physics and Astronomy, chemistry.chemical_element, scintillation detector, Germanium, low background experiment, Scintillator, Nuclear physics, chemistry, Excited state, Double beta decay, Cd-106, Underground laboratory, Ground state
Abstract

A search for the β+β+, β+/EC, and EC/EC decays of 106Cd was performed at the Modane Underground Laboratory (France) located at a depth of 4800 m w.e. using a TGV-2 multidetector germanium spectrometer. A preliminary evaluation is performed of the experimental data accumulated during the measurements (12 900 h) of ∼13.6 g of 106Cd (with an enrichment of 75%) and the spectrometer background without samples and with samples of natural Cd. New limits (at a 90% confidence level) of half-lives are obtained: T 1/2 ⩾ 1.7 × 1020 yr and T 1/2 ⩾ 1.6 × 1020 yr for the 0νEC/EC resonant decay of 106Cd to the 2741 keV and 2718 keV excited states of the daughter nucleus 106Pd and T 1/2 ⩾ 4.2 × 1020 yr for the 2νEC/EC decay to the ground state of 106Pd (0+ → 0+, g.s.). The limits for other branches of the double beta decay of 106Cd with transitions to the ground and excited states of 106Pd are improved.

Published
2021
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4. Observations of track-like neutrino events with Baikal-GVD

Author

Dmitry Zaborov, V.A. Allakhverdyan, A.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, R. Bannasch, Zuzana Bardačová, I.A. Belolaptikov, I.V. Borina, V.B. Brudanin, N.M. Budnev, V.Y. Dik, G.V. Domogatsky, A.A. Doroshenko, Rastislav Dvornicky, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, Eliška Eckerová, T.V. Elzhov, L. Fajt, Stanislav Vasilevich Fialkovsky, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopański, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, Fedor Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, Ivan Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, and S.A. Yakovlev

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Muon, Physics::Instrumentation and Detectors, Track (disk drive), Astrophysics::High Energy Astrophysical Phenomena, Detector, Monte Carlo method, FOS: Physical sciences, Flux, Reconstruction algorithm, Nuclear physics, Neutrino detector, High Energy Physics::Experiment, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM)
Abstract

The Baikal Gigaton Volume Detector (Baikal-GVD) is a km$^3$-scale neutrino detector currently under construction in Lake Baikal, Russia. The detector currently consists of 2304 optical modules arranged on 64 vertical strings. Further extension of the array is planned for March 2022. The data from the partially complete array have been analyzed using a $\chi^2$-based track reconstruction algorithm. After suppression of the downward-going atmospheric muon background, a flux of upward-going neutrino events is observed, dominated by the atmospheric neutrinos. The observed flux is in good agreement with Monte Carlo predictions., Comment: 8 pages, 5 figures, to be published in Proceedings of the 37th International Cosmic Ray Conference (ICRC-2021), 12-23 July 2021

Published
2021

5. Experimental string with fiber optic data acquisition for Baikal-GVD

Author

Vladimir Aynutdinov, A. Allakhverdyan, A.D. Avrorin, A.V. Avrorin, R. Bannasch, Z. Bardаčová, I.A. Belolaptikov, I.V. Borina, V.B. Brudanin, N.M. Budnev, V.Y. Dik, G.V. Domogatsky, A.A. Doroshenko, Rastislav Dvornicky, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, Eliška Eckerová, T.V. Elzhov, L. Fajt, Stanislav Vasilevich Fialkovsky, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopanski, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, Fedor Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, Ivan Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S.A. Yakovlev, and D.N. Zaborov

Published
2021
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6. Time synchronization of Baikal-GVD clusters

Author

Vladimir Aynutdinov, V.A. Allakhverdyan, A.D. Avrorin, A.V. Avrorin, R. Bannasch, Z. Bardаčová, I.A. Belolaptikov, I.V. Borina, V.B. Brudanin, N.M. Budnev, V.Y. Dik, G.V. Domogatsky, A.A. Doroshenko, Rastislav Dvornicky, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, Eliška Eckerová, T.V. Elzhov, L. Fajt, Stanislav Vasilevich Fialkovsky, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopanski, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, Fedor Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, Ivan Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S.A. Yakovlev, and D.N. Zaborov

Published
2021
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7. Performance of the muon track reconstruction with the Baikal-GVD neutrino telescope

Author

Grigory Safronov, V.A. Allakhverdyan, A.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, R. Bannasch, Zuzana Bardačová, I.A. Belolaptikov, V.B. Brudanin, N.M. Budnev, V.Y. Dik, G.V. Domogatsky, A.A. Doroshenko, Rastislav Dvornicky, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, Eliška Eckerová, T.V. Elzhov, L. Fajt, Stanislav Vasilevich Fialkovsky, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopański, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, B.A. Shaybonov, M.D. Shelepov, Fedor Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, Ivan Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S.A. Yakovlev, and D.N. Zaborov

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Track (disk drive), Monte Carlo method, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Classifier (linguistics), High Energy Physics::Experiment, Gradient boosting, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Selection (genetic algorithm)
Abstract

Baikal-GVD is a km$^3$-scale neutrino telescope being constructed in Lake Baikal. Muon and partially tau (anti)neutrino interactions near the detector through the W$^{\pm}$-boson exchange are accompanied by muon tracks. Reconstructed direction of the track is arguably the most precise probe of the neutrino direction attainable in Cerenkov neutrino telescopes. Muon reconstruction techniques adopted by Baikal-GVD are discussed in the present report. Performance of the muon reconstruction is studied using realistic Monte Carlo simulation of the detector. The algorithms are applied to real data from Baikal-GVD and the results are compared with simulations. The performance of the neutrino selection based on a boosted decision tree classifier is discussed., 8 pages, 5 figures. Poster presented at 37th International Cosmic Ray Conference (ICRC 2021), July 12th - 23rd, 2021, Online - Berlin, Germany. PoS(ICRC2021)1080

Published
2021
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8. The Baikal-GVD neutrino telescope: search for high-energy cascades

Author

Zhan-Arys Magysovich Dzhilkibaev, V.A. Allakhverdyan, А.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, R. Bannasch, Z. Bardаčová, I.A. Belolaptikov, I.V. Borina, V.B. Brudanin, N.M. Budnev, V.Y. Dik, G.V. Domogatsky, A.A. Doroshenko, Rastislav Dvornicky, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, Eliška Eckerová, T.V. Elzhov, L. Fajt, Stanislav Vasilevich Fialkovsky, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopański, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, Fedor Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, Ivan Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S.А. Yakovlev, D.N. Zaborov, Yu.A. Kovalev, Yu.Yu. Kovalev, A.V. Plavin, S.V. Troitsky, A.K. Erkenov, T.V. Mufakharov, Yu.V. Sotnikova, T. Hovatta, S. Kiehlmann, and A.C.S. Readhead

Published
2021
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9. Follow up of the IceCube alerts with the Baikal-GVD telescope

Author

V.Y. Dik, V.A. Allakhverdyan, A.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, R. Bannasch, Z. Bardačová, I.A. Belolaptikov, I.V. Borina, V.B. Brudanin, N.M. Budnev, G.V. Domogatsky, A.A. Doroshenko, R. Dvornický, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, E. Eckerová, T.V. Elzhov, L. Fajt, S.V. Fialkovski, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopański, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, F. Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, I. Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S.A. Yakovlev, and D.N. Zaborov

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, High Energy Physics::Experiment, Astrophysics - High Energy Astrophysical Phenomena, Instrumentation, Mathematical Physics
Abstract

The high-energy muon neutrino events of the IceCube telescope, that are triggered as neutrino alerts in one of two probability ranks of astrophysical origin, "gold" and "bronze", have been followed up by the Baikal-GVD in a fast quasi-online mode since September 2020. Search for correlations between alerts and GVD events reconstructed in two modes, muon-track and cascades (electromagnetic or hadronic showers), for the time windows $ \pm $ 1 h and $ \pm $ 12 h does not indicate statistically significant excess of the measured events over the expected number of background events. Upper limits on the neutrino fluence will be presented for each alert., Comment: 5 pages, 5 figures, Proceedings for the VLVnT 2021 conference, submitted to JINST

Published
2021
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10. Final Results of GERDA on the Search for Neutrinoless Double-ß Decay

Author

V. I. Gurentsov, Bayarto Lubsandorzhiev, A. Lubashevskiy, T. Wester, A. A. Vasenko, A.A. Smolnikov, J. Huang, O.I. Kochetov, J. Janicskó Csáthy, R. Mingazheva, C. Cattadori, Anna Julia Zsigmond, Kai Zuber, A. M. Gangapshev, B. Schwingenheuer, R. Brugnera, V. V. Kuzminov, Matteo Agostini, V. V. Kazalov, O. Schulz, E. Doroshkevich, Franz Dieter Fischer, A.-K. Schütz, I. Zhitnikov, I. V. Kirpichnikov, Werner Hofmann, N. Di Marco, Paolo Piseri, G. R. Araujo, D. R. Zinatulina, A. Lazzaro, D. Stukov, M. Schwarz, M. Miloradovic, Allen Caldwell, A. Garfagnini, W. Maneschg, S. Schönert, Josef Jochum, E. A. Yanovich, M. Balata, C. Bauer, Stefano Riboldi, L. Shtembari, F. Salamida, Manfred Lindner, V.B. Brudanin, C. Ransom, Hardy Simgen, I. R. Barabanov, V. D'Andrea, C. Gooch, S. V. Zhukov, P. Krause, Igor Nemchenok, Mikael Hult, K. Panas, K. von Sturm, Bela Majorovits, K. N. Gusev, J. Hakenmüller, M. Misiaszek, R. Kneißl, K. T. Knöpfle, L. Manzanillas, E. V. Demidova, T. Comellato, L. Pertoldi, S. Hemmer, Y. Kermaïdic, Laura Baudis, A. Pullia, G. Zuzel, O. Selivanenko, S. Belogurov, Ivano Lippi, C. Wiesinger, A. V. Veresnikova, M. Shirchenko, A. Chernogorov, M. Fomina, R. Hiller, E. Bossio, M. Schütt, D. Borowicz, L. V. Inzhechik, Cinzia Sada, B. Zatschler, P. Grabmayr, Alessandro Bettini, Y. Müller, C. Macolino, V. Bothe, V. N. Kornoukhov, K. Pelczar, M. Junker, C. Vignoli, Guillaume Lutter, A. M. Bakalyarov, L. Rauscher, A. Zschocke, Jochen Schreiner, V. Biancacci, L. B. Bezrukov, E. Shevchik, M. M. Wojcik, E. Bellotti, Th. Kihm, H. Khushbakht, P. Moseev, Luciano Pandola, A. A. Klimenko, N. Rumyantseva, M. Laubenstein, and GERDA collaboration

Subjects
Physics, Physics - Instrumentation and Detectors, Signal region, General Physics and Astronomy, chemistry.chemical_element, Germanium, 7. Clean energy, 01 natural sciences, Cosmology, High Energy Physics - Experiment, 3. Good health, Semiconductor detector, Nuclear physics, chemistry, GE-76, 0103 physical sciences, GERDA - Abteilung Hinton, Liquid argon, Beta (velocity), SHAPE, High Energy Physics::Experiment, Sensitivity (control systems), 010306 general physics, Nuclear Experiment, Diode
Abstract

The GERmanium Detector Array (GERDA) experiment searched for the lepton-number-violating neutrinoless double-$\beta$ ($0\nu\beta\beta$) decay of $^{76}$Ge, whose discovery would have far-reaching implications in cosmology and particle physics. By operating bare germanium diodes, enriched in $^{76}$Ge, in an active liquid argon shield, GERDA achieved an unprecedently low background index of $5.2\times10^{-4}$ counts/(keV$\cdot$kg$\cdot$yr) in the signal region and met the design goal to collect an exposure of 100 kg$\cdot$yr in a background-free regime. When combined with the result of Phase I, no signal is observed after 127.2 kg$\cdot$yr of total exposure. A limit on the half-life of $0\nu\beta\beta$ decay in $^{76}$Ge is set at $T_{1/2}>1.8\times10^{26}$ yr at 90% C.L., which coincides with the sensitivity assuming no signal., Comment: 7 pages, 3 figures, submitted to Physical Review Letters

Published
2020

11. Baikal-GVD: status and first results

Author

Grigory Safronov, A.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, Z. Bardáčová, R. Bannasch, I.A. Belolaptikov, V.B. Brudanin, N.M. Budnev, G.V. Domogatsky, E. Eckerová, T.V. Elzhov, L. Fajt, S.V. Fialkovski, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, R.A. Ivanov, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopański, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.K. Kryukov, M.V. Kruglov, V.F. Kulepov, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, F. Šimkovic, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, I. Štekl, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S. Yakovlev, and D.N. Zaborov𝑎

Published
2020
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12. Experimental and simulated data at fragment productions in 100 MeV proton-induced reaction on 232Th

Author

D.V. Filosofov, R. Vespalec, D.V. Karaivanov, Robert Holomb, J. Khushvaktov, Lukas Zavorka, A. A. Solnyshkin, Miroslav Zeman, J. Vrzalova, Karel Katovsky, V.B. Brudanin, V.M. Tsupko-Sitnikov, J. Adam, and Ivan Haysak

Subjects
Materials science, Proton, 020209 energy, 020208 electrical & electronic engineering, Monte Carlo method, Thorium, chemistry.chemical_element, 02 engineering and technology, Spectral line, Nuclear physics, chemistry, 0202 electrical engineering, electronic engineering, information engineering, Neutron, Irradiation, FOIL method, Beam (structure)
Abstract

This paper shows the results from the experiment that was done in JINR (Joint Institute for Nuclear Research) Dubna. Thorium foil between two aluminum foils was irradiated inside Phasotron with 100 MeV protons. As a result - gamma spectra was obtained from the Th and aluminum foils and residual nuclei cross-sections were evaluated from the reaction. Also there was made a simulation analysis of the beam distribution inside the Th foil and particle escape from the target. The experimental cross-sections were compared with calculations made in Monte-Carlo simulation (MCNP 6.1).

Published
2020
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13. First Search for Bosonic Superweakly Interacting Massive Particles with Masses up to 1 MeV/c2 with GERDA

Author

K. Panas, M. M. Wojcik, V. N. Kornoukhov, K. Pelczar, A.-K. Schütz, E. Bellotti, L. B. Bezrukov, E. Shevchik, N. Di Marco, Alessandro Bettini, Manfred Lindner, W. Maneschg, Guillaume Lutter, A. M. Bakalyarov, E. A. Yanovich, T. Wester, A.A. Smolnikov, O.I. Kochetov, Laura Baudis, C. Cattadori, Anna Julia Zsigmond, V. G. Egorov, Kai Zuber, R. Brugnera, O. Selivanenko, R. Mingazheva, Th. Kihm, M. Balata, A. A. Vasenko, V. V. Kuzminov, Matteo Agostini, L. Rauscher, B. Schwingenheuer, M. Junker, Werner Hofmann, V. I. Gurentsov, A. Zschocke, V. Bothe, Paolo Piseri, Allen Caldwell, A. M. Gangapshev, E. Doroshkevich, I. V. Kirpichnikov, H. Khushbakht, P. Moseev, Jochen Schreiner, P. Grabmayr, Luciano Pandola, Bayarto Lubsandorzhiev, L. V. Inzhechik, C. Vignoli, A. Lazzaro, M. Miloradovic, K. von Sturm, A. A. Klimenko, L. Pertoldi, M. Schwarz, A. Garfagnini, O. Schulz, A. Pullia, K. N. Gusev, A. Lubashevskiy, N. Rumyantseva, K. T. Knöpfle, C. Macolino, Cinzia Sada, V.B. Brudanin, C. Ransom, Hardy Simgen, B. Zatschler, I. R. Barabanov, C. Gooch, R. Kneißl, S. V. Zhukov, Josef Jochum, S. Schönert, V. V. Kazalov, Franz Dieter Fischer, T. Comellato, M. Laubenstein, A. V. Veresnikova, A. Chernogorov, R. Hiller, G. Zuzel, P. Krause, Y. Kermaïdic, Ivano Lippi, J. Hakenmüller, C. Wiesinger, M. Shirchenko, V. D'Andrea, M. Fomina, D. Stukov, E. Bossio, F. Salamida, C. Bauer, Stefano Riboldi, M. Misiaszek, M. Schütt, D. Borowicz, J. Janicskó Csáthy, I. Zhitnikov, Igor Nemchenok, Bela Majorovits, E. V. Demidova, S. Belogurov, D. R. Zinatulina, Mikael Hult, and S. Hemmer

Subjects
Physics, Particle physics, 2019-20 coronavirus outbreak, Photon, Coronavirus disease 2019 (COVID-19), Physics::Instrumentation and Detectors, Dark matter, General Physics and Astronomy, chemistry.chemical_element, Germanium, Electron, 7. Clean energy, 01 natural sciences, Pseudoscalar, chemistry, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Dimensionless quantity
Abstract

We present the first search for bosonic superweakly interacting massive particles (super-WIMPs) as keV-scale dark matter candidates performed with the GERDA experiment. GERDA is a neutrinoless double-s decay experiment which operates high-purity germanium detectors enriched in ^{76}Ge in an ultralow background environment at the Laboratori Nazionali del Gran Sasso (LNGS) of INFN in Italy. Searches were performed for pseudoscalar and vector particles in the mass region from 60 keV/c^{2} to 1 MeV/c^{2}. No evidence for a dark matter signal was observed, and the most stringent constraints on the couplings of super-WIMPs with masses above 120 keV/c^{2} have been set. As an example, at a mass of 150 keV/c^{2} the most stringent direct limits on the dimensionless couplings of axionlike particles and dark photons to electrons of g_{ae}

Published
2020
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14. Technique for suppression of background cascades produced by atmospheric muon bundles in the Baikal-GVD

Author

V.A. Allakhverdyan, A.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, R. Bannasch, Z. Bardačová, I.A. Belolaptikov, I.V. Borina, V.B. Brudanin, N.M. Budnev, V.Y. Dik, G.V. Domogatsky, A.A. Doroshenko, R. Dvornický, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, E. Eckerová, T.V. Elzhov, L. Fajt, S.V. Fialkovski, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopański, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, F. Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, I. Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S.A. Yakovlev, and D.N. Zaborov

Subjects
Physics::Instrumentation and Detectors, Instrumentation, Mathematical Physics
Abstract

Baikal-GVD (Gigaton Volume Detector) is a neutrino telescope located in pure water of Lake Baikal. At the current stage (season 2021), detector is composed of 2304 optical modules arranged in 8 clusters. In searching for neutrino cascade events, light patterns produced via discrete stochastic energy losses along muon tracks create the most abundant background. Methods to separate cascade-like events from tracks and neutrino cascades in a single cluster have been developed and optimized. One of the method tries to find the maximum number of track hits amongst cascade hits, which are present in the muon bundle event. Other ones rely on the distributions of charges and positions of hits on optical modules associated with cascade events. All suppression methods were optimized by the Monte Carlo simulation datasets.

Published
2022
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15. Method and portable bench for tests of the laser optical calibration system components for the Baikal-GVD underwater neutrino Cherenkov telescope

Author

V.A. Allakhverdyan, A.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, R. Bannasch, Z. Bardačová, I.A. Belolaptikov, I.V. Borina, V.B. Brudanin, N.M. Budnev, V.Y. Dik, G.V. Domogatsky, A.A. Doroshenko, R. Dvornický, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, E. Eckerová, T.V. Elzhov, L. Fajt, S.V. Fialkovski, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopański, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, F. Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, I. Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S.A. Yakovlev, and D.N. Zaborov

Subjects
Physics - Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Instrumentation, Mathematical Physics
Abstract

The large-scale deep underwater Cherenkov neutrino telescopes like Baikal-GVD, ANTARES or KM3NeT, require calibration and testing methods of their optical modules. These methods usually include laser-based systems which allow to check the telescope responses to the light and for real-time monitoring of the optical parameters of water such as absorption and scattering lengths, which show seasonal changes in natural reservoirs of water. We will present a testing method of a laser calibration system and a set of dedicated tools developed for Baikal- GVD, which includes a specially designed and built, compact, portable, and reconfigurable scanning station. This station is adapted to perform fast quality tests of the underwater laser sets just before their deployment in the telescope structure, even on ice, without darkroom. The testing procedure includes the energy stability test of the laser device, 3D scan of the light emission from the diffuser and attenuation test of the optical elements of the laser calibration system. The test bench consists primarily of an automatic mechanical scanner with a movable Si detector, beam splitter with a reference Si detector and, optionally, Q-switched diode-pumped solid-state laser used for laboratory scans of the diffusers. The presented test bench enables a three-dimensional scan of the light emission from diffusers, which are designed to obtain the isotropic distribution of photons around the point of emission. The results of the measurement can be easily shown on a 3D plot immediately after the test and may be also implemented to a dedicated program simulating photons propagation in water, which allows to check the quality of the diffuser in the scale of the Baikal-GVD telescope geometry., Comment: Presented at the VLVnT - Very Large Volume Neutrino Telescope Workshop, Valencia, 18-21 May 2021

Published
2021
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16. Luminescence of Baikal water as a dynamic background of the Baikal-GVD Neutrino Telescope

Author

V.A. Allakhverdyan, A.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, R. Bannasch, Z. Bardačová, I.A. Belolaptikov, I.V. Borina, V.B. Brudanin, N.M. Budnev, V.Y. Dik, G.V. Domogatsky, A.A. Doroshenko, R. Dvornický, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, E. Eckerová, T.V. Elzhov, L. Fajt, S.V. Fialkovski, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopański, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, F. Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, I. Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S.A. Yakovlev, and D.N. Zaborov

Subjects
Instrumentation, Mathematical Physics
Abstract

The Baikal-GVD is a neutrino telescope situated in the deepest freshwater lake in the world — Lake Baikal. The design of the Baikal-GVD trigger system allows also to study the ambient light of the lake. The analysis of the optical light activity of Baikal water, particularly, time and spatial variations of the luminescence activity for data collected in years 2018, 2019, and 2020 is presented. For the first time we observed highly luminescent layer moving upwards with maximal speed of 28 m/day in January 2021.

Published
2021
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17. Development of $$^{100}\hbox {Mo}$$ 100 Mo -containing scintillating bolometers for a high-sensitivity neutrinoless double-beta decay search

Author

C. Augier, T. Bergmann, V. Sanglard, S. Di Domizio, M. Vignati, B. Paul, L. Hehn, X. F. Navick, J. W. Beeman, A. Giuliani, E. Queguiner, J. Billard, Andreas Fleischmann, Matthias Laubenstein, H. le Sueur, L. Cardani, L. Dumoulin, L. Devoyon, L. Pattavina, J. Gascon, A. S. Zolotarova, Stefano Pirro, V. Kozlov, L. Gastaldo, A. Cazes, T. Redon, Francesca Bellini, E. Yakushev, G. Piperno, O. Strazzer, Y. Penichot, I.M. Ivanov, S. Scorza, P. Pari, L. Pagnanini, V. D. Grigorieva, Noël Coron, A. Juillard, Matias Velázquez, F. Koskas, Claire A. Marrache-Kikuchi, P. Camus, V.N. Shlegel, K. Eitel, M. de Combarieu, S. V. Rozov, V. V. Kobychev, L. Vagneron, L. Bergé, Vl.I. Tretyak, Matias Rodrigues, R. S. Boiko, V. A. Kudryavtsev, E. Armengaud, F. Ferroni, A. Broniatowski, M. Pavan, Yong Jin, A. S. Barabash, N. Foerster, D. Tcherniakhovski, Alain Benoit, O. Plantevin, N.V. Ivannikova, Martin Loidl, P. de Marcillac, K. Schäffner, Matthias Kleifges, S. Marnieros, P. Magnier, C. Rusconi, M. Gros, C. Nones, D.V. Poda, D. M. Chernyak, B. Siebenborn, M. O. Nikolaichuk, Claudia Tomei, F.A. Danevich, Ya.V. Vasiliev, M. Mancuso, V. I. Umatov, S.I. Konovalov, Christian Enss, E. Olivieri, V. Humbert, S. Hervé, Marc Weber, N. Casali, V.B. Brudanin, M. Chapellier, L. Gironi, I. Dafinei, H. Kraus, G. Pessina, T.B. Bekker, E. P. Makarov, S. Nagorny, M. De Jesus, Silvia Capelli, V. Novati, and F. Charlieux

Subjects
Physics, Lithium molybdate, Recrystallization (geology), Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Bolometer, lcsh:Astrophysics, 01 natural sciences, law.invention, Nuclear physics, Full width at half maximum, chemistry.chemical_compound, chemistry, law, Double beta decay, 0103 physical sciences, lcsh:QB460-466, lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Sensitivity (control systems), Neutrino, 010306 general physics, Engineering (miscellaneous), Energy (signal processing)
Abstract

This paper reports on the development of a technology involving $$^{100}\hbox {Mo}$$ 100 Mo -enriched scintillating bolometers, compatible with the goals of CUPID, a proposed next-generation bolometric experiment to search for neutrinoless double-beta decay. Large mass ( $$\sim 1~\hbox {kg}$$ ∼ 1 kg ), high optical quality, radiopure $$^{100}\hbox {Mo}$$ 100 Mo -containing zinc and lithium molybdate crystals have been produced and used to develop high performance single detector modules based on 0.2–0.4 kg scintillating bolometers. In particular, the energy resolution of the lithium molybdate detectors near the Q-value of the double-beta transition of $$^{100}\hbox {Mo}$$ 100 Mo (3034 keV) is 4–6 keV FWHM. The rejection of the $$\alpha $$ α -induced dominant background above 2.6 MeV is better than $$8\sigma $$ 8 σ . Less than $$10~\upmu \hbox {Bq/kg}$$ 10 μ Bq/kg activity of $$^{232}\hbox {Th}\, (^{228}\hbox {Th})$$ 232 Th ( 228 Th ) and $$^{226}\hbox {Ra}$$ 226 Ra in the crystals is ensured by boule recrystallization. The potential of $$^{100}\hbox {Mo}$$ 100 Mo -enriched scintillating bolometers to perform high sensitivity double-beta decay searches has been demonstrated with only $$10~\hbox {kg}\times \hbox {d}$$ 10 kg × d exposure: the two neutrino double-beta decay half-life of $$^{100}\hbox {Mo}$$ 100 Mo has been measured with the up-to-date highest accuracy as $$T_{1/2}$$ T 1 / 2 = [6.90 ± 0.15(stat.) ± 0.37(syst.)] $$\times ~10^{18}~\hbox {years}$$ × 10 18 years . Both crystallization and detector technologies favor lithium molybdate, which has been selected for the ongoing construction of the CUPID-0/Mo demonstrator, containing several kg of $$^{100}\hbox {Mo}$$ 100 Mo .

Published
2017
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18. Precise measurement of $2\nu\beta\beta$ decay of $^{100}$Mo with the CUPID-Mo detection technology

Author

Matthias Kleifges, S. Marnieros, A. S. Barabash, J. Kotila, Ezio Previtali, E. Guerard, B. Welliver, Lindley Winslow, P. de Marcillac, Claudia Tomei, A. S. Zolotarova, L. Marini, R. G. Huang, O. G. Polischuk, D. Misiak, Th. Redon, J. Billard, L. Cardani, Stefano Pirro, Federico Ferri, Yao Shen, J. Johnston, M. Pavan, P. Camus, V. Novati, B. K. Fujikawa, M. de Combarieu, L. Pattavina, Alain Benoit, B. Siebenborn, Yu. A. Borovlev, F. Charlieux, H. Z. Huang, S. V. Rozov, B. Paul, E. Armengaud, E. P. Makarov, L. Ma, Vasundhara Singh, F.A. Danevich, M. Briere, P. Loaiza, B. Schmidt, E. Elkhoury, M. De Jesus, A. Giuliani, V. I. Umatov, D. L. Helis, S. I. Konovalov, C. Rusconi, M. Gros, C. Nones, L. Dumoulin, V.N. Shlegel, K. Eitel, H. Khalife, Marc Weber, X. F. Navick, Francesca Bellini, G. Pessina, A. Leder, D.V. Poda, V.I. Tretyak, M. Beretta, P. Pari, L. Pagnanini, Yu G. Kolomensky, Ioan Dafinei, Jonathan Ouellet, C. Augier, Giovanni Benato, K. Schäffner, V. Sanglard, A. Juillard, Matias Velázquez, V. V. Kobychev, L. Vagneron, L. Bergé, E. Yakushev, L. Gironi, E. Olivieri, J. Gascon, A. Cazes, Ch. Bourgeois, V.B. Brudanin, M. Chapellier, N. Casali, M. Xue, V. D. Grigorieva, Haiping Peng, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Néel (NEEL), Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), Laboratoire de l'Accélérateur Linéaire (LAL), Institut Rayonnement Matière de Saclay (IRAMIS), Science et Ingénierie des Matériaux et Procédés (SIMaP), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Armengaud, E, Augier, C, Barabash, A, Bellini, F, Benato, G, Benoit, A, Beretta, M, Berge, L, Billard, J, Borovlev, Y, Bourgeois, C, Briere, M, Brudanin, V, Camus, P, Cardani, L, Casali, N, Cazes, A, Chapellier, M, Charlieux, F, de Combarieu, M, Dafinei, I, Danevich, F, De Jesus, M, Dumoulin, L, Eitel, K, Elkhoury, E, Ferri, F, Fujikawa, B, Gascon, J, Gironi, L, Giuliani, A, Grigorieva, V, Gros, M, Guerard, E, Helis, D, Huang, H, Huang, R, Johnston, J, Juillard, A, Khalife, H, Kleifges, M, Kobychev, V, Kolomensky, Y, Konovalov, S, Leder, A, Kotila, J, Loaiza, P, Ma, L, Makarov, E, de Marcillac, P, Marini, L, Marnieros, S, Misiak, D, Navick, X, Nones, C, Novati, V, Olivieri, E, Ouellet, J, Pagnanini, L, Pari, P, Pattavina, L, Paul, B, Pavan, M, Peng, H, Pessina, G, Pirro, S, Poda, D, Polischuk, O, Previtali, E, Redon, T, Rozov, S, Rusconi, C, Sanglard, V, Schaffner, K, Schmidt, B, Shen, Y, Shlegel, V, Siebenborn, B, Singh, V, Tomei, C, Tretyak, V, Umatov, V, Vagneron, L, Velazquez, M, Weber, M, Welliver, B, Winslow, L, Xue, M, Yakushev, E, Zolotarova, A, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Hélium : du fondamental aux applications (NEEL - HELFA), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Cryogénie (NEEL - Cryo)

Subjects
Lithium molybdate, Physics - Instrumentation and Detectors, Physics and Astronomy (miscellaneous), Analytical chemistry, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, Atomic, chemistry.chemical_compound, Particle and Plasma Physics, two-neutrino double-beta decay, scintillating bolometers, 0103 physical sciences, ddc:530, Beta (velocity), Nuclear, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), physics.ins-det, S076H2N, Physics, Quantum Physics, 010308 nuclear & particles physics, Molecular, Beta decay, Nuclear & Particles Physics, 3. Good health, chemistry, double beta decays, bolometers, Underground laboratory, Ground state
Abstract

We report the measurement of the two-neutrino double-beta ($2\nu\beta\beta$) decay of $^{100}$Mo to the ground state of $^{100}$Ru using lithium molybdate (\crystal) scintillating bolometers. The detectors were developed for the CUPID-Mo program and operated at the EDELWEISS-III low background facility in the Modane underground laboratory. From a total exposure of $42.235$ kg$\times$d, the half-life of $^{100}$Mo is determined to be $T_{1/2}^{2\nu}=[7.12^{+0.18}_{-0.14}\,\mathrm{(stat.)}\pm0.10\,\mathrm{(syst.)}]\times10^{18}$ years. This is the most accurate determination of the $2\nu\beta\beta$ half-life of $^{100}$Mo to date. We also confirm, with the statistical significance of $>3\sigma$, that the single-state dominance model of the $2\nu\beta\beta$ decay of $^{100}$Mo is favored over the high-state dominance model., Comment: 11 pages, 6 figures, 4 tables

Published
2020
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19. Spectral analysis for the Majorana Demonstrator experiment

Author

B. X. Zhu, V. Yumatov, J. Gruszko, Yu. Efremenko, M. Buuck, G. K. Giovanetti, Keith Rielage, B. Shanks, V. E. Guiseppe, T. Gilliss, R. D. Martin, R. G. H. Robertson, A. W. Bradley, T. Bode, C-H. Yu, Eric W. Hoppe, J. A. Detwiler, M. Shirchenko, M. P. Green, C. J. Barton, C. Dunagan, T. S. Caldwell, Ralph Massarczyk, Walter C. Pettus, C. R. Haufe, C.M. O'Shaughnessy, S. I. Alvis, A. L. Reine, S. Vasilyev, N. Abgrall, I. Zhitnikov, R. L. Varner, F. E. Bertrand, I. J. Arnquist, N. W. Ruof, Anne-Marie Suriano, I. S. Guinn, C. Cuesta, W. Xu, J. E. Trimble, Pinghan Chu, G. Othman, A. W. P. Poon, Y-D. Chan, K. J. Keeter, D. Tedeschi, L. Hehn, S. I. Konovalov, J. Myslik, M. A. Howe, Richard T. Kouzes, J. Rager, H. Ejiri, Steven Elliott, Kai Vetter, C. D. Christofferson, M. F. Kidd, Susanne Mertens, E. Yakushev, J. F. Wilkerson, S. J. Meijer, B. R. White, K. Vorren, V.B. Brudanin, F. T. Avignone, Reyco Henning, A. M. Lopez, C. Wiseman, A. S. Barabash, D. C. Radford, and M. Busch

Subjects
Physics, History, Physics - Instrumentation and Detectors, FOS: Physical sciences, Molecular, Instrumentation and Detectors (physics.ins-det), nucl-ex, Condensed Matter Physics, Atomic, Computer Science Applications, Education, Combinatorics, Other Physical Sciences, Monte carlo data, MAJORANA, Particle and Plasma Physics, Background suppression, Statistical analysis, Spectral analysis, Nuclear, Nuclear Experiment (nucl-ex), Nuclear Experiment, physics.ins-det
Abstract

The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decays in germanium-76 and to demonstrate the feasibility to deploy a ton-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and $^{76}\textrm{Ge}$-enriched germanium detectors totaling 44.1 kg (29.7 kg enriched detectors), located at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Data taken with this setup since summer 2015 at different construction stages of the experiment show a clear reduction of the observed background index around the ROI for $0\nu\beta\beta$-decay search due to improvements in shielding. We discuss the statistical approaches to search for a $0\nu\beta\beta$-signal and derive the physics sensitivity for an expected exposure of $10\,\textrm{kg}{\cdot}\textrm{y}$ from enriched detectors using a profile likelihood based hypothesis test in combination with toy Monte Carlo data., Comment: 5 page, 2 figures, to appear in Proceedings of TAUP 2017 - XV International Conference on Topics in Astroparticle and Underground Physics, 24 - 28 July 2017, Sudbury, ON, Canada

Published
2020

20. Data quality assurance for the Majorana Demonstrator

Author

C.M. O'Shaughnessy, Kai Vetter, C. D. Christofferson, M. F. Kidd, Keith Rielage, V. Yumatov, Yu. Efremenko, M. Shirchenko, C. Cuesta, K. Vorren, I. J. Arnquist, N. W. Ruof, F. E. Bertrand, Ralph Massarczyk, G. K. Giovanetti, F. T. Avignone, A. S. Barabash, Reyco Henning, A. W. P. Poon, A. M. Lopez, J. Gruszko, S. Vasilyev, N. Abgrall, C. R. Haufe, J. E. Trimble, S. I. Alvis, B. Shanks, V. E. Guiseppe, Pinghan Chu, J. Myslik, R. L. Varner, M. P. Green, I. Zhitnikov, T. Gilliss, V.B. Brudanin, K. J. Keeter, D. Tedeschi, T. Bode, C-H. Yu, Richard T. Kouzes, L. Hehn, R. D. Martin, Susanne Mertens, E. Yakushev, D. C. Radford, R. G. H. Robertson, Eric W. Hoppe, Walter C. Pettus, A. W. Bradley, S. J. Meijer, C. Wiseman, A. L. Reine, B. X. Zhu, S. I. Konovalov, M. Busch, T. S. Caldwell, Anne-Marie Suriano, M. Buuck, J. A. Detwiler, G. Othman, C. Dunagan, I. S. Guinn, C. J. Barton, W. Xu, Y-D. Chan, J. F. Wilkerson, B. R. White, M. A. Howe, J. Rager, H. Ejiri, and Steven Elliott

Subjects
Physics, Discrete mathematics, History, Physics - Instrumentation and Detectors, Molecular, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Condensed Matter Physics, Atomic, Computer Science Applications, Education, Other Physical Sciences, MAJORANA, Particle and Plasma Physics, Nuclear, physics.ins-det
Abstract

The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decays in germanium-76 and to demonstrate the feasibility to deploy a large-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and $^{76}$Ge-enriched germanium detectors totalling 44.1 kg, located at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Any neutrinoless double-beta decay search requires a thorough understanding of the background and the signal energy spectra. The various techniques employed to ensure the integrity of the measured spectra are discussed. Data collection is monitored with a thorough set of checks, and subsequent careful analysis is performed to qualify the data for higher level physics analysis. Instrumental background events are tagged for removal, and problematic channels are removed from consideration as necessary., Comment: 5 pages, 2 figures, Proceedings of TAUP 2017 - XV International Conference on Topics in Astroparticle and Underground Physics (Sudbury ON, Canada, July 24-28, 2017)

Published
2020
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21. First data from the CUPID-Mo neutrinoless double beta decay experiment

Author

K. Schäffner, N. Casali, Matthias Kleifges, M. De Jesus, S. Marnieros, S. V. Rozov, Alexandre Benoit, V. Singh, J. Gascon, Haiping Peng, P. Camus, Federico Ferri, R. G. Huang, C. Rusconi, M. de Combarieu, C. Augier, M. Gros, A. Cazes, P. Pari, L. Pagnanini, Yu G. Kolomensky, L. Dumoulin, A. S. Barabash, E. Olivieri, V. Sanglard, V. Novati, Marc Weber, A. Juillard, B. Paul, Matias Velázquez, V. V. Kobychev, L. Vagneron, Ezio Previtali, L. Bergé, O. G. Polischuk, M. Xue, B. K. Fujikawa, X.-F. Navick, K. Eitel, H. Khalife, V.N. Shlegel, B. Welliver, D. L. Helis, F. Charlieux, H. Z. Huang, D. Misiak, Ioan Dafinei, E. P. Makarov, V. D. Grigorieva, L. Cardani, Stefano Pirro, Giovanni Benato, E. Elkhoury, Francesca Bellini, P. de Marcillac, E. Yakushev, L. Gironi, Jonathan Ouellet, A. Giuliani, S. I. Konovalov, L. Pattavina, Ch. Bourgeois, V.B. Brudanin, M. Chapellier, M. Beretta, Lindley Winslow, Th. Redon, J. Billard, M. Pavan, L. Marini, Yao Shen, J. Johnston, A. Leder, Yu. A. Borovlev, E. Armengaud, E. Guerard, L. Ma, Claudia Tomei, F.A. Danevich, P. Loaiza, V. I. Umatov, S. Sorbino, A. S. Zolotarova, G. Pessina, B. Siebenborn, M. Briere, B. Schmidt, C. Nones, D.V. Poda, and V.I. Tretyak

Subjects
Physics, History, Particle physics, Scintillation, Physics - Instrumentation and Detectors, Light detection, Bolometer, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), High Energy Physics - Experiment, Computer Science Applications, Education, law.invention, High Energy Physics - Experiment (hep-ex), Full width at half maximum, CUORE, law, Double beta decay, Background suppression, ddc:530, Sensitivity (control systems), Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The CUPID-Mo experiment is searching for neutrinoless double beta decay in $^{100}$Mo, evaluating the technology of cryogenic scintillating Li$_{2}^{100}$MoO$_4$ detectors for CUPID (CUORE Upgrade with Particle ID). CUPID-Mo detectors feature background suppression using a dual-readout scheme with Li$_{2}$MoO$_4$ crystals complemented by Ge bolometers for light detection. The detection of both heat and scintillation light signals allows the efficient discrimination of $\alpha$ from $\gamma$&$\beta$ events. In this proceedings, we discuss results from the first 2 months of data taking in spring 2019. In addition to an excellent bolometric performance of 6.7$\,$keV (FWHM) at 2615$\,$keV and an $\alpha$ separation of better than 99.9\% for all detectors, we report on bulk radiopurity for Th and U. Finally, we interpret the accumulated physics data in terms of a limit of $T_{1/2}^{0\nu}\,> 3\times10^{23}\,$yr for $^{100}$Mo and discuss the sensitivity of CUPID-Mo until the expected end of physics data taking in early 2020., Comment: Proceedings for TAUP 2019, submitted to IOP Journal of Physics: Conference Series

Published
2020
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22. Modeling of GERDA Phase II data

Author

A. Domula, M. Schwarz, Laura Baudis, C. Wiesinger, Paolo Piseri, M. Shirchenko, A. Lazzaro, E. Bossio, I. V. Kirpichnikov, Alessandro Bettini, D. R. Zinatulina, M. Miloradovic, E. V. Demidova, A. V. Veresnikova, A. Chernogorov, R. Hiller, R. Kneißl, S. Belogurov, V. D'Andrea, Stefano Riboldi, V.B. Brudanin, C. Ransom, Igor Nemchenok, M. Schütt, M. Misiaszek, Cinzia Sada, B. Zatschler, Bela Majorovits, C. Macolino, Hardy Simgen, W. Maneschg, E. A. Yanovich, P. Moseev, Luciano Pandola, A. A. Klimenko, C. Vignoli, R. Brugnera, Mikael Hult, D. Borowicz, K. N. Gusev, Jochen Schreiner, L. Pertoldi, F. Fischer, Josef Jochum, N. Rumyantseva, V. V. Kuzminov, Matteo Agostini, V. I. Gurentsov, S. Hemmer, Y. Kermaïdic, J. Janicskó Csáthy, Stefan Schönert, E. Doroshkevich, Bayarto Lubsandorzhiev, L. V. Inzhechik, Ivano Lippi, Manfred Lindner, E. Bellotti, T. Wester, A.A. Smolnikov, K. Panas, I. Zhitnikov, V. Bothe, C. Cattadori, Anna Julia Zsigmond, Kai Zuber, A. Zschocke, L. B. Bezrukov, E. Shevchik, A.-K. Schütz, Marcin Wójcik, V. N. Kornoukhov, M. Fomina, P. Grabmayr, K. Pelczar, N. Di Marco, O.I. Kochetov, Guillaume Lutter, A. M. Bakalyarov, I. R. Barabanov, A. M. Gangapshev, C. Gooch, S. V. Zhukov, Thomas Kihm, O. Selivanenko, R. Mingazheva, B. Schwingenheuer, M. Junker, Oliver Schulz, Alberto Pullia, V. G. Egorov, M. Balata, A. Garfagnini, K. T. Knöpfle, T. Comellato, L. Vanhoefer, Matthias Laubenstein, G. Zuzel, V. V. Kazalov, P. Krause, A. A. Vasenko, Christian Bauer, A. Lubashevskiy, J. Hakenmüller, D. Stukov, Werner Hofmann, F. Salamida, Allen Caldwell, and K. von Sturm

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Spectrum (functional analysis), Detector, Phase (waves), FOS: Physical sciences, Order (ring theory), Instrumentation and Detectors (physics.ins-det), 01 natural sciences, Semiconductor detector, ddc, Region of interest, 0103 physical sciences, Dark Matter and Double Beta Decay (experiments), lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, DOUBLE-BETA DECAY, Sensitivity (control systems), Nuclear Experiment (nucl-ex), Neutrino, 010306 general physics, Nuclear Experiment
Abstract

The GERmanium Detector Array (Gerda) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double-beta (0νββ) decay of 76Ge. The technological challenge of Gerda is to operate in a “background-free” regime in the region of interest (ROI) after analysis cuts for the full 100 kg·yr target exposure of the experiment. A careful modeling and decomposition of the full-range energy spectrum is essential to predict the shape and composition of events in the ROI around Qββ for the 0νββ search, to extract a precise measurement of the half-life of the double-beta decay mode with neutrinos (2νββ) and in order to identify the location of residual impurities. The latter will permit future experiments to build strategies in order to further lower the background and achieve even better sensitivities. In this article the background decomposition prior to analysis cuts is presented for Gerda Phase II. The background model fit yields a flat spectrum in the ROI with a background index (BI) of $$ {16.04}_{-0.85}^{+0.78}\cdotp {10}^{-3} $$ 16.04 − 0.85 + 0.78 · 10 − 3 cts/(keV·kg·yr) for the enriched BEGe data set and $$ {14.68}_{-0.52}^{+0.47}\cdotp {10}^{-3} $$ 14.68 − 0.52 + 0.47 · 10 − 3 cts/(keV·kg·yr) for the enriched coaxial data set. These values are similar to the one of Phase I despite a much larger number of detectors and hence radioactive hardware components.

Published
2019

23. Status of the MAJORANA DEMONSTRATOR

Author

D. Byram, Jonathan D. Leon, M. Shirchenko, T. Gilliss, John L. Orrell, Vladimir Yumatov, R. D. Martin, Alan Poon, M. P. Green, Anne-Marie Suriano, J. A. Detwiler, W. Xu, Stanley M. Howard, H. Ejiri, J. F. Wilkerson, C.-H. Yu, C.M. O'Shaughnessy, B. R. White, R. G. H. Robertson, Yu. Efremenko, M. Buuck, Keith Rielage, E. Romero-Romero, S. I. Konovalov, J. E. Trimble, J. Rager, A. Galindo-Uribarri, I. Zhitnikov, Matthew Busch, C. Cuesta, F. T. Avignone, Kai Vetter, S. Vasilyev, Yuen-Dat Chan, Brian D. LaFerriere, C. D. Christofferson, R. L. Varner, J. MacMullin, Reyco Henning, N. Abgrall, D. J. Tedeschi, I. S. Guinn, B. Shanks, B. R. Jasinski, Eric W. Hoppe, J. Gruszko, A. S. Caldwell, V. E. Guiseppe, K. Vorren, C. Wiseman, M. A. Howe, F. E. Bertrand, J. Goett, A. W. Bradley, S. R. Elliott, D. C. Radford, K. Keeter, E. Yakushev, A. S. Barabash, V.B. Brudanin, Richard T. Kouzes, C. X. Balderrot-Barrera, G. K. Giovanetti, S. J. Meijer, Susanne Mertens, M. F. Kidd, I. J. Arnquist, and N. Snyder

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, business.industry, Modular design, 01 natural sciences, Semiconductor detector, Nuclear physics, MAJORANA, 0103 physical sciences, Detector array, 010306 general physics, business
Abstract

The MAJORANA Collaboration is constructing the MAJORANA DEMONSTRATOR, an ultralow background, 40-kg modular high purity Ge (HPGe) detector array to search for neutrinoless double-beta decay (0νββ-decay) in 76Ge. The goal of the experiment is to demonstrate a background rate at or below 3 counts/(t-y) in the 4 keV region of interest (ROI) around the 2039 keV Q-value for 76Ge 0νββ-decay. In this paper, the status of the MAJORANA DEMONSTRATOR, including its design and measurements of properties of the HPGe crystals is presented.

Published
2017
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24. Neutrino signal at Baikal from dark matter in the Galactic Center

Author

M.B. Milenin, D.Yu. Bogorodsky, B.A. Tarashansky, V.I. Ljashuk, A.V. Avrorin, A. I. Panfilov, Aleksandr Gafarov, O.G. Kebkal, V. A. Kozhin, A.V. Korobchenko, A.P. Koshechkin, M.I. Rozanov, A. V. Zagorodnikov, Mark Shelepov, B.A. Shaybonov, V.B. Brudanin, A.D. Avrorin, N. M. Budnev, G.V. Domogatsky, R. R. Mirgazov, O. N. Gaponenko, A.A. Smagina, A. N. Dyachok, E.N. Pliskovsky, V.F. Kulepov, Evgenii V Rjabov, D.A. Kuleshov, K.V. Golubkov, F.K. Koshel, Valery Zurbanov, K.V. Konischev, T. I. Gress, I. A. Belolaptikov, Konstantin Kebkal, A.V. Skurihin, A.A. Sheifler, E. A. Osipova, A. A. Doroshenko, Zh.-A.M. Dzhilkibaev, R. Bannasch, S.V. Fialkovsky, V. A. Zhukov, Olga Suvorova, L. V. Pankov, I. A. Danilchenko, V. M. Aynutdinov, Sergey Yakovlev, Zdenek Hons, and Sergei Demidov

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Galactic Center, Dark matter, Scalar field dark matter, Astronomy, Elementary particle, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Galaxy, Massless particle, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, 010306 general physics, Astrophysics::Galaxy Astrophysics, Lepton
Abstract

We discuss neutrinos originating from dark matter in the Galactic Center and present sensitivity of Baikal Gigaton Volume Detector to this signal.

Published
2016
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25. Data acquisition system for the Baikal-GVD neutrino telescope

Author

R. R. Mirgazov, V. M. Aynutdinov, O. N. Gaponenko, A. A. Doroshenko, Sergey Yakovlev, D.Yu. Bogorodsky, A.V. Korobchenko, B. A. Tarashchansky, Zh.-A.M. Dzhilkibaev, I. A. Belolaptikov, Konstantin Kebkal, V.A. Tabolenko, A. V. Skurikhin, V.B. Brudanin, R. Bannasch, A.A. Smagina, S.V. Fialkovsky, K.V. Golubkov, A.D. Avrorin, Zdenek Hons, V. A. Zhukov, G.V. Domogatsky, N. M. Budnev, E.N. Pliskovsky, A.A. Sheifler, I. A. Danilchenko, A. I. Panfilov, D.A. Kuleshov, Valery Zurbanov, O.G. Kebkal, F.K. Koshel, A. N. Dyachok, K.V. Konischev, M.I. Rozanov, T. I. Gress, E. V. Ryabov, Olga Suvorova, L. V. Pankov, A.P. Koshechkin, A.V. Avrorin, B. A. Shaibonov, Aleksandr Gafarov, M.B. Milenin, A. V. Zagorodnikov, V.F. Kulepov, E. A. Osipova, V. A. Kozhin, and V. I. Lyashuk

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Neutrino telescope, Detector, Volume (computing), Astrophysics, 01 natural sciences, Data acquisition, Neutrino detector, 0103 physical sciences, Neutrino, 010306 general physics, Digitization, Remote sensing, Data transmission
Abstract

The objective of the Baikal-GVD project is the construction of a km3-scale neutrino telescope in Lake Baikal. The Gigaton Volume Detector consists of a large three-dimensional array of photo-multiplier tubes. The first GVD-cluster has been deployed and commissioned in April 2015. The data acquisition system (DAQ) of the detector takes care of the digitization of the photo-multiplier tube signals, data transmission, filtering and storage. The design and the implementation of the data acquisition system are described.

Published
2016
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26. A search for neutrino signal from dark matter annihilation in the center of the Milky Way with Baikal NT200

Author

M.B. Milenin, T. I. Gress, E.N. Pliskovsky, Mark Shelepov, A.V. Skurihin, V.B. Brudanin, D.A. Kuleshov, F.K. Koshel, Sergei Demidov, A.V. Avrorin, N. M. Budnev, Aleksandr Gafarov, A.V. Korobchenko, R. R. Mirgazov, A.D. Avrorin, A. V. Zagorodnikov, A.A. Sheifler, B.A. Tarashansky, O. N. Gaponenko, A. I. Panfilov, A.P. Koshechkin, V.F. Kulepov, Evgenii V Rjabov, V. M. Aynutdinov, G.V. Domogatsky, Sergey Yakovlev, Z. Honz, I. A. Danilchenko, O.G. Kebkal, M.I. Rozanov, K.V. Konischev, I. A. Belolaptikov, Konstantin Kebkal, K.V. Golubkov, Valery Zurbanov, V.I. Ljashuk, D.Yu. Bogorodsky, E. A. Osipova, V.A. Tabolenko, R. Bannasch, S.V. Fialkovsky, V. A. Zhukov, A. A. Doroshenko, Zh.-A.M. Dzhilkibaev, A.A. Smagina, A.V. Kozhin, Olga Suvorova, L. V. Pankov, B.A. Shaybonov, and A. N. Dyachok

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Hot dark matter, Dark matter, Scalar field dark matter, FOS: Physical sciences, Astronomy, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Dark matter halo, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Neutrino detector, 0103 physical sciences, Warm dark matter, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, 010306 general physics, Light dark matter
Abstract

We reanalyze the dataset collected during the years 1998--2003 by the deep underwater neutrino telescope NT200 in the lake Baikal with the low energy threshold (10 GeV) in searches for neutrino signal from dark matter annihilations near the center of the Milky Way. Two different approaches are used in the present analysis: counting events in the cones around the direction towards the Galactic Center and the maximum likelihood method. We assume that the dark matter particles annihilate dominantly over one of the annihilation channels $b\bar{b}$, $W^+W^-$, $\tau^+\tau^-$, $\mu^+\mu^-$ or $\nu\bar{\nu}$. No significant excess of events towards the Galactic Center over expected neutrino background of atmospheric origin is found and we derive 90% CL upper limits on the annihilation cross section of dark matter., Comment: 15 pages, 14 figures, published version

Published
2016
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27. High voltage testing for the Majorana Demonstrator

Author

Ralph Massarczyk, A. Galindo-Uribarri, Yuen-Dat Chan, S. Vasilyev, A. Li, A. Thompson, Alan Poon, N. Abgrall, Anne-Marie Suriano, J. A. Detwiler, Z. Fu, F. E. Bertrand, R. D. Martin, J. Gruszko, J. Goett, J. F. Wilkerson, R. G. H. Robertson, M. A. Howe, E. Romero-Romero, D. J. Tedeschi, B. R. White, C.M. O'Shaughnessy, Stanley M. Howard, Jonathan D. Leon, I. S. Guinn, F. T. Avignone, R. L. Varner, B. R. Jasinski, M. P. Green, M. Buuck, C. Wiseman, Reyco Henning, Eric W. Hoppe, C. Cuesta, J. Rager, D. Byram, Matthew Busch, Y.-U. Efremenko, P. J. Doe, C.-H. Yu, H. Ejiri, A. S. Barabash, Susanne Mertens, A. W. Bradley, V. Yumatov, K. J. Keeter, V.B. Brudanin, B. Shanks, V. E. Guiseppe, S. R. Elliott, Brian D. LaFerriere, D. C. Radford, A. S. Caldwell, Keith Rielage, M. Shirchenko, John L. Orrell, J. MacMullin, Kai Vetter, S. J. Meijer, C. D. Christofferson, K. Vorren, K. T. Ton, M. F. Kidd, E. Yakushev, C. Dunagan, S. I. Konovalov, W. Xu, G. K. Giovanetti, J. E. Trimble, Pinghan Chu, Richard T. Kouzes, I. J. Arnquist, and N. Snyder

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Vacuum, FOS: Physical sciences, Feedthrough, Context (language use), nucl-ex, Atomic, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Particle and Plasma Physics, 0103 physical sciences, Nuclear, Nuclear Experiment (nucl-ex), 010306 general physics, physics.ins-det, Nuclear Experiment, Instrumentation, Physics, MAJORANA, hep-ex, 010308 nuclear & particles physics, business.industry, Detector, Electrical engineering, Molecular, High voltage, Instrumentation and Detectors (physics.ins-det), High-voltage, Micro-discharge, Modular design, Nuclear & Particles Physics, Semiconductor detector, Other Physical Sciences, business, Astronomical and Space Sciences, Voltage
Abstract

The MAJORANA Collaboration is constructing the MAJORANA Demonstrator, an ultra-low background, 44-kg modular high-purity Ge (HPGe) detector array to search for neutrinoless double-beta decay in Ge-76. The phenomenon of surface micro-discharge induced by high-voltage has been studied in the context of the MAJORANA Demonstrator. This effect can damage the front-end electronics or mimic detector signals. To ensure the correct performance, every high-voltage cable and feedthrough must be capable of supplying HPGe detector operating voltages as high as 5 kV without exhibiting discharge. R&D measurements were carried out to understand the testing system and determine the optimum design configuration of the high-voltage path, including different improvements of the cable layout and feedthrough flange model selection. Every cable and feedthrough to be used at the MAJORANA Demonstrator was characterized and the micro-discharge effects during the MAJORANA Demonstrator commissioning phase were studied. A stable configuration has been achieved, and the cables and connectors can supply HPGe detector operating voltages without exhibiting discharge., 9 pages, 12 figures, 8 tables, submitted to NIM A

Published
2016
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28. Status of the early construction phase of Baikal-GVD

Author

Aleksandr Gafarov, A. V. Zagorodnikov, A.P. Koshechkin, I. A. Danilchenko, A. I. Panfilov, O.G. Kebkal, T. I. Gress, M.I. Rozanov, A. A. Perevalov, E.N. Pliskovsky, D.A. Kuleshov, F.K. Koshel, A.A. Sheifler, A.D. Avrorin, A. V. Skurikhin, K. V. Konishchev, V.F. Kulepov, G.V. Domogatsky, D. Bogorodsky, A.V. Korobchenko, N. M. Budnev, B. Shaibonov, V. M. Aynutdinov, V.F. Rubtsov, A.A. Smagina, V.B. Brudanin, M.B. Milenin, Sergey Yakovlev, E. A. Osipova, Z. Honz, Valery Zurbanov, Olga Suvorova, L. V. Pankov, R. R. Mirgazov, A. A. Doroshenko, O. N. Gaponenko, Zh.-A.M. Dzhilkibaev, Evgenii V Rjabov, V. A. Kozhin, B. A. Tarashchansky, A. N. Dyachok, V.I. Ljashuk, A.V. Avrorin, V. A. Poleschuk, E. N. Konstantinov, I. A. Belolaptikov, Konstantin Kebkal, R. Bannasch, S.V. Fialkovsky, V. A. Zhukov, and K.V. Golubkov

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Positioning system, Physics::Instrumentation and Detectors, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Neutrino telescope, Astrophysics::Instrumentation and Methods for Astrophysics, Phase (waves), Astronomy, Cluster (spacecraft), 01 natural sciences, Software deployment, 0103 physical sciences, Instrumentation (computer programming), Neutrino telescopes, Lake Baikal, Aerospace engineering, Neutrino, 010306 general physics, business, 010303 astronomy & astrophysics, Cherenkov radiation
Abstract

The second-stage neutrino telescope BAIKAL-GVD in Lake Baikal will be a research infrastructure aimed mainly at studying astrophysical neutrino fluxes by recording the Cherenkov radiation of the secondary muons and showers generated in neutrino interactions. The prototyping/early construction phase of the BAIKAL-GVD project which is directed towards deployment and operation of the first demonstration cluster has been started in April 2011. An important step on realization of the GVD project was made in 2014 by the deployment of the second stage of the demonstration cluster which contains 112 OMs arranged on five strings, as well as equipment of an acoustic positioning system and instrumentation string with an array calibration and environment monitoring equipment. Deployment of the demonstration cluster will be completed in 2015.

Published
2016
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29. Design and first tests of the S3 detector of reactor antineutrinos

Author

V.B. Brudanin, Lukas Fajt, Egor Shevchik, Petr Přidal, E. Rukhadze, Mária Slavíčková, Tomas Slavicek, Maroš Petro, V. Belov, I. Stekl, Miroslav Macko, Jan Broulim, Sergei Kazartsev, Karel Smolek, Rastislav Hodak, Zdeněk Kruliš, I. Zhitnikov, Petr Masek, M. Fomina, Danuše Michálková, and V. Egorov

Subjects
Physics, Sterile neutrino, neutrino oscillations, Physics::Instrumentation and Detectors, QC1-999, Nuclear engineering, Detector, s3 experiment, reactor neutrinos, Data acquisition, Inverse beta decay, High Energy Physics::Experiment, Neutron, Neutrino, Neutrino oscillation, Electron neutrino
Abstract

The new experiment S3 devoted to the study of reactor antineutrinos was designed and constructed as a common activity of IEAP CTU in Prague and JINR (Dubna). The S3 detector is a compact, highly segmented polystyrene-based scintillating detector composed of 80 detector elements with a gadolinium neutron converter between elements layers. A positron and a neutron are produced in an inverse beta decay initiated with an electron antineutrino in the detector. A modular multi-channel fast ADC was developed for the data acquisition for the whole 80-channel S3 detector and the 4-channel cosmic veto system. The detector meets very strict safety rules of nuclear power plants and can be installed in a chamber located immediately under the reactor. The close vicinity from the reactor enables to study neutrino properties with a higher efficiency, to investigate neutrino oscillations at short baselines and try to verify the hypothesis of a sterile neutrino. The details of the design and construction of the S3 detector, as well as properties of the modular multi-channel fast ADC system, and first tests of the device are presented.

Published
2021
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30. 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

31. 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

32. Characterization and long-term performance of the Radon Trapping Facility operating at the Modane Underground Laboratory

Author

J. Busto, F. Mamedov, T. Suchá, B. Soule, V.B. Brudanin, E. Rukhadze, P. Rulík, I. Svetlík, J. Macl, O.I. Kochetov, K. Smolek, J. Hůlka, D. Lalanne, M. Havelcová, F. Perrot, I. Štekl, G. Warot, R. Noel, P. Loaiza, Rastislav Hodak, M. Žaloudková, F. Piquemal, S. Jullian, J. Mizera, M. Zampaolo, 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), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire 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), 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), 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), 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), 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]), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), and 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)

Subjects
Nuclear and High Energy Physics, Compressed air, radon: absorption, chemistry.chemical_element, Soil science, Radon, tau: lifetime, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, dark matter, double-beta decay: (0neutrino), Double beta decay, 0103 physical sciences, germanium: detector, Orders of magnitude (data), Exponential decay, 010306 general physics, background: radioactivity, Background radiation, Physics, energy: high, 010308 nuclear & particles physics, force: van der Waals, temperature: gradient, radon: background, Semiconductor detector, chemistry, Activated charcoal, 13. Climate action, radiation: background, experimental results
Abstract

International audience; Radon is one of the main potential sources of background radiation for any rare event experiments like neutrinoless double beta decay or dark matter experiments. The Radon Trapping Facility (RTF) installed in 2004 at the Modane Underground Laboratory (LSM) has been running for nine years providing radon-purified air at a level of 10 mBq m−3 for several experiments. The radon suppression principle is based on a radon physical adsorption using cooled compressed air at −55 °C pumped through a column filled with the K48 activated charcoal. After disassembling of the RTF, the 2.6 m high charcoal column has been divided into several layers in order to study with different techniques the dynamic adsorption coefficient (the K-factor) as a function of the depth and the radon spatial trapping profile by measuring the 210Pb activity. It has been demonstrated that after almost a decade of running, the K-factor of the activated charcoal remains constant except for the first few cm of the column. Furthermore, it has been demonstrated that the mass activity of 210Pb as a function of the depth of the charcoal column exhibits an exponential decay profile. The radon mean retention time τ R of (47.6 ± 1.2) days and the radon mean free path of (28.9 ± 0.4) cm have been derived and found to be consistent at 1σ with the ones obtained from the K-factor study, i.e. from a total independent measurement. The radon suppression factor of the RTF of has been also estimated with a value consistent at 2σ with the suppression factor measured during the RTF operation. Thus, this study has proven the capacity of the RTF to purify the LSM air from radon by more than three orders of magnitude during nine years of operation.

Published
2019
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33. 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

34. 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

35. First Limit on the Direct Detection of Lightly Ionizing Particles for Electric Charge as Low as e/1000 with the Majorana Demonstrator

Author

Ralph Massarczyk, S. Vasilyev, V. Yumatov, Richard T. Kouzes, I. J. Arnquist, N. W. Ruof, T. Gilliss, Keith Rielage, C. Wiseman, S. R. Elliott, Yu. Efremenko, R. D. Martin, W. Xu, M. A. Howe, Y-D. Chan, G. Othman, Eric W. Hoppe, R. G. H. Robertson, S. I. Konovalov, Walter C. Pettus, A. L. Reine, G. K. Giovanetti, T. S. Caldwell, C. R. Haufe, C. D. Christofferson, C.-H. Yu, J. F. Wilkerson, S. I. Alvis, D. J. Tedeschi, S. J. Meijer, I. S. Guinn, B. X. Zhu, I. Zhitnikov, Matthew Busch, B. Shanks, C. Cuesta, V. E. Guiseppe, C. J. Barton, Pinghan Chu, J. Gruszko, F. E. Bertrand, J. Myslik, Alan Poon, C. Dunagan, Susanne Mertens, Anne-Marie Suriano, M. Buuck, J. A. Detwiler, L. Hehn, M. P. Green, F. T. Avignone, H. Ejiri, R. L. Varner, D. C. Radford, E. Yakushev, Reyco Henning, C.M. O'Shaughnessy, A. M. Lopez, V.B. Brudanin, J. Rager, B. R. White, K. Vorren, M. Shirchenko, and A. S. Barabash

Subjects
Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, General Physics and Astronomy, 01 natural sciences, Electric charge, Particle detector, Standard Model, Semiconductor detector, Nuclear physics, MAJORANA, Double beta decay, 0103 physical sciences, Grand Unified Theory, High Energy Physics::Experiment, 010306 general physics, Radioactive decay
Abstract

The Majorana Demonstrator is an ultralow-background experiment searching for neutrinoless double-beta decay in ^{76}Ge. The heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility in Lead, South Dakota, also allows searches for new exotic physics. Free, relativistic, lightly ionizing particles with an electrical charge less than e are forbidden by the standard model but predicted by some of its extensions. If such particles exist, they might be detected in the Majorana Demonstrator by searching for multiple-detector events with individual-detector energy depositions down to 1 keV. This search is background-free, and no candidate events have been found in 285 days of data taking. New direct-detection limits are set for the flux of lightly ionizing particles for charges as low as e/1000.

Published
2018
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36. Recent Results from the Majorana Demonstrator

Author

Eric W. Hoppe, C. R. Haufe, S. I. Alvis, T. S. Caldwell, Ralph Massarczyk, J. A. Detwiler, S. Vasilyev, D. C. Radford, I. Zhitnikov, J. Rager, I. J. Arnquist, N. W. Ruof, C. Dunagan, H. Ejiri, Kai Vetter, C. D. Christofferson, M. F. Kidd, V. Yumatov, Keith Rielage, F. E. Bertrand, Yu. Efremenko, A. W. P. Poon, M. Busch, Chang-Hong Yu, M. P. Green, M. A. Howe, S. I. Konovalov, G. K. Giovanetti, A. S. Barabash, G. Othman, J. Gruszko, C. Cuesta, Pinghan Chu, C. Wiseman, F. T. Avignone, I. S. Guinn, R. L. Varner, B. X. Zhu, W. Xu, Reyco Henning, J. F. Wilkerson, B. Shanks, V. E. Guiseppe, A. M. Lopez, S. R. Elliott, K. J. Keeter, C. J. Barton, D. Tedeschi, B. R. White, T. Gilliss, Y-D. Chan, R. D. Martin, M. Shirchenko, L. Hehn, C.M. O'Shaughnessy, R. G. H. Robertson, Richard T. Kouzes, V.B. Brudanin, J. Myslik, T. Bode, Anne-Marie Suriano, S. J. Meijer, M. Buuck, K. Vorren, Walter C. Pettus, A. L. Reine, Susanne Mertens, and E. Yakushev

Subjects
Particle physics, Physics - Instrumentation and Detectors, Physics beyond the Standard Model, FOS: Physical sciences, Design elements and principles, nucl-ex, 01 natural sciences, 7. Clean energy, Double beta decay, 0103 physical sciences, Nuclear Experiment (nucl-ex), Detector array, 010306 general physics, Nuclear Experiment, physics.ins-det, Physics, 010308 nuclear & particles physics, business.industry, Detector, Instrumentation and Detectors (physics.ins-det), Modular design, MAJORANA, germanium, Production (computer science), Neutrinoless double-beta decay, business, point-contact detectors, Energy (signal processing)
Abstract

The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decay in $^{76}$Ge and to demonstrate the feasibility to deploy a large-scale experiment in a phased and modular fashion. It consists of two modules of natural and $^{76}$Ge-enriched germanium detectors totalling 44.1 kg, operating at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Commissioning of the experiment began in June 2015, followed by data production with the full detector array in August 2016. The ultra-low background and record energy resolution achieved by the MAJORANA DEMONSTRATOR enable a sensitive neutrinoless double-beta decay search, as well as additional searches for physics beyond the Standard Model. I will discuss the design elements that enable these searches, along with the latest results, focusing on the neutrinoless double-beta decay search. I will also discuss the current status and the future plans of the MAJORANA DEMONSTRATOR, as well as the plans for a future tonne-scale $^{76}$Ge experiment., 4 pages. Proceedings of The 39th International Conference on High Energy Physics (ICHEP2018), 4-11 July, 2018, Seoul, Korea. Submitted to Proceedings of Science

Published
2018

37. 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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38. Improved Limit on Neutrinoless Double- β Decay of Ge76 from GERDA Phase II

Author

L. V. Inzhechik, D. R. Zinatulina, O. Schulz, Mikael Hult, T. Comellato, V. G. Egorov, M. Balata, V. Wagner, G. Zuzel, L. Vanhoefer, C. Bauer, A. A. Vasenko, T. Bode, Stefano Riboldi, A.-K. Schütz, A. Hegai, N. Di Marco, M. Misiaszek, F. Salamida, R. Brugnera, A. Garfagnini, V. V. Kuzminov, Matteo Agostini, Manfred Lindner, J. Janicskó Csáthy, V. N. Kornoukhov, Y. Kermaïdic, A. Kish, K. Pelczar, A. V. Veresnikova, J. Hakenmüller, I. Zhitnikov, Ivano Lippi, Allen Caldwell, A. Chernogorov, M. Junker, C. Wiesinger, A. Wegmann, M. Shirchenko, R. Hiller, L. Pertoldi, Igor Nemchenok, Guillaume Lutter, A. Kirsch, O. Selivanenko, A. M. Bakalyarov, A. Lubashevskiy, W. Maneschg, S. Hemmer, M. Laubenstein, E. A. Yanovich, K. von Sturm, Bela Majorovits, R. Falkenstein, P. Grabmayr, B. Schneider, I. V. Kirpichnikov, V. I. Gurentsov, V. V. Kazalov, M. Miloradovic, D. Borowicz, J. Biernat, Bayarto Lubsandorzhiev, R. Mingazheva, C. Schmitt, B. Schwingenheuer, R. Kneißl, O.I. Kochetov, Th. Kihm, A. M. Gangapshev, P. Moseev, Luciano Pandola, A. A. Klimenko, Werner Hofmann, M. Heisel, N. Rumyantseva, A. Zschocke, Alessandro Bettini, E. V. Demidova, S. Belogurov, C. Macolino, A. Pullia, Cinzia Sada, V. D'Andrea, A. Lazzaro, S. Schönert, K. Panas, T. Wester, A.A. Smolnikov, C. Cattadori, Anna Julia Zsigmond, Kai Zuber, M. M. Wojcik, E. Bellotti, E. Doroshkevich, L. B. Bezrukov, E. Shevchik, A. Domula, L. Stanco, V.B. Brudanin, C. Ransom, Hardy Simgen, Josef Jochum, I. R. Barabanov, S. V. Zhukov, K. N. Gusev, K. T. Knöpfle, and Laura Baudis

Subjects
Semileptonic decay, Physics, 010308 nuclear & particles physics, Phase (waves), General Physics and Astronomy, chemistry.chemical_element, Germanium, Type (model theory), 01 natural sciences, chemistry, Double beta decay, 0103 physical sciences, Sensitivity (control systems), Atomic physics, 010306 general physics, Energy (signal processing), Diode
Abstract

The GERDA experiment searches for the lepton-number-violating neutrinoless double-β decay of ^{76}Ge (^{76}Ge→^{76}Se+2e^{-}) operating bare Ge diodes with an enriched ^{76}Ge fraction in liquid argon. The exposure for broad-energy germanium type (BEGe) detectors is increased threefold with respect to our previous data release. The BEGe detectors feature an excellent background suppression from the analysis of the time profile of the detector signals. In the analysis window a background level of 1.0_{-0.4}^{+0.6}×10^{-3} counts/(keV kg yr) has been achieved; if normalized to the energy resolution this is the lowest ever achieved in any 0νββ experiment. No signal is observed and a new 90% C.L. lower limit for the half-life of 8.0×10^{25} yr is placed when combining with our previous data. The expected median sensitivity assuming no signal is 5.8×10^{25} yr.

Published
2018
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39. Search for Neutrinoless Double- β Decay in Ge76 with the Majorana Demonstrator

Author

S. I. Alvis, D. J. Tedeschi, I. Zhitnikov, J. C. Loach, M. Boswell, J. I. Collar, B. R. Jasinski, J. Myslik, C. O'Shaughnessy, L. E. Leviner, Henning O. Back, J. MacMullin, Kai Vetter, W. Xu, V. Yumatov, I. S. Guinn, D. M. Mei, R. A. Johnson, Ronald L. Brodzinski, M. F. Kidd, Yuen-Dat Chan, T. S. Caldwell, A. W. Bradley, A. S. Caldwell, S. I. Konovalov, E. Aguayo, S. R. Elliott, M. Busch, M. Shirchenko, John L. Orrell, P. H. Chu, G. Othman, Reynold J. Cooper, Ralph Massarczyk, A. Galindo-Uribarri, Craig E. Aalseth, M. C. Ronquest, J. Goett, C. J. Barton, K. T. Lesko, S. Zimmermann, T. Gilliss, J. E. Trimble, D. Steele, C. Wiseman, B. K. Fujikawa, K. Vorren, S. Vasilyev, H. Yaver, J. Gruszko, I. J. Arnquist, N. W. Ruof, Keith Rielage, N. Snyder, P. Finnerty, Alexis G. Schubert, C. D. Christofferson, Harry S. Miley, Paul N. Luke, M. Buuck, M. A. Howe, A. L. Hallin, N. Abgrall, Yu. Efremenko, Alan Poon, J. Rager, Anne-Marie Suriano, Paul Barton, A. B. McDonald, J. A. Detwiler, Jonathan D. Leon, James E. Fast, A. S. Barabash, J. H. Merriman, C. Cuesta, R. Henning, C. R. Haufe, A. Knecht, Erin S. Fuller, F. E. Bertrand, F. T. Avignone, R. L. Varner, Michael G. Marino, D. C. Radford, K. J. Snavely, C.-H. Yu, A. M. Lopez, J.H. Reeves, K. Pushkin, T. Bode, E. Yakushev, P. J. Doe, Walter C. Pettus, Todd W. Hossbach, B. X. Zhu, A. L. Reine, K. J. Keeter, V.B. Brudanin, P. S. Barbeau, Nicole R. Overman, A. R. Young, D. G. Phillips, Brian D. LaFerriere, V. E. Guiseppe, J. A. Dunmore, G. K. Giovanetti, M. L. Miller, R. D. Martin, Eric W. Hoppe, Richard T. Kouzes, Susanne Mertens, R. G. H. Robertson, B. Shanks, Jeremy D. Kephart, Werner Tornow, D. C. Combs, Z. Fu, S.J. J Meijer, B. Bos, F. M. Fraenkle, G. Perumpilly, V. M. Gehman, J. F. Wilkerson, B. R. White, L. Hehn, M. P. Green, S. MacMullin, H. Ejiri, and Mark Amman

Subjects
Physics, Semileptonic decay, 010308 nuclear & particles physics, General Physics and Astronomy, 01 natural sciences, Semiconductor detector, Nuclear physics, Full width at half maximum, MAJORANA, Double beta decay, 0103 physical sciences, Neutrino, 010306 general physics, Neutrino oscillation, Energy (signal processing)
Abstract

The Majorana Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-β decay in ^{76}Ge. The Majorana Demonstrator comprises 44.1 kg of Ge detectors (29.7 kg enriched in ^{76}Ge) split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. Here we present results from data taken during construction, commissioning, and the start of full operations. We achieve unprecedented energy resolution of 2.5 keV FWHM at Q_{ββ} and a very low background with no observed candidate events in 9.95 kg yr of enriched Ge exposure, resulting in a lower limit on the half-life of 1.9×10^{25} yr (90% C.L.). This result constrains the effective Majorana neutrino mass to below 240-520 meV, depending on the matrix elements used. In our experimental configuration with the lowest background, the background is 4.0_{-2.5}^{+3.1} counts/(FWHM t yr).

Published
2018
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40. Validation of Monte Carlo simulation of neutron production in a spallation experiment

Author

W.I. Furman, Karel Katovsky, V. M. Tsoupko-Sitnikov, J. Vrzalova, P. Čaloun, O. Svoboda, V.B. Brudanin, V. Chilap, Sergey I. Tyutyunnikov, I.V. Zhuk, V. Voronko, O. V. Bukhal, Lukas Zavorka, V. Wagner, J. Adam, P. Zhivkov, M. Artiushenko, M. Suchopár, I. Mar’in, Krystsina Husak, A. A. Solnyshkin, M. Kadykov, J. Khushvaktov, V.V. Sotnikov, A.A. Baldin, Vitaly Pronskikh, and V. I. Stegailov

Subjects
Nuclear physics, Physics, Nuclotron, Nuclear Energy and Engineering, chemistry, Neutron emission, chemistry.chemical_element, Spallation, Neutron, Neutron scattering, Uranium, Natural uranium, Neutron temperature
Abstract

A renewed interest in experimental research on Accelerator-Driven Systems (ADS) has been initiated by the global attempt to produce energy from thorium as a safe(r), clean(er) and (more) proliferation-resistant alternative to the uranium-fuelled thermal nuclear reactors. The ADS research has been actively pursued at the Joint Institute for Nuclear Research (JINR), Dubna, since decades. Most recently, the emission of fast neutrons was experimentally investigated at the massive (m = 512 kg) natural uranium spallation target QUINTA. The target has been irradiated with the relativistic deuteron beams of energy from 0.5 AGeV up to 4 AGeV at the JINR Nuclotron accelerator in numerous experiments since 2011. Neutron production inside the target was studied through the gamma-ray spectrometry measurement of natural uranium activation detectors. Experimental reaction rates for (n,γ), (n,f) and (n,2n) reactions in uranium have provided valuable information about the neutron distribution over a wide range of energies up to some GeV. The experimental data were compared to the predictions of Monte Carlo simulations using the MCNPX 2.7.0 code. The results are presented and potential sources of partial disagreement are discussed later in this work.

Published
2015
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41. Status and recent results of the BAIKAL-GVD project

Author

V.B. Brudanin, I. A. Danilchenko, R. R. Mirgazov, D.Yu. Bogorodsky, A. V. Skurikhin, A.A. Smagina, A. A. Doroshenko, A. A. Perevalov, Zh.-A.M. Dzhilkibaev, A.D. Avrorin, K. V. Konishchev, I. A. Belolaptikov, Konstantin Kebkal, G.V. Domogatsky, T. I. Gress, N. M. Budnev, E. A. Osipova, E.N. Pliskovsky, A.A. Sheifler, Zdenek Hons, A. I. Panfilov, D.A. Kuleshov, A.P. Koshechkin, O.G. Kebkal, E. N. Konstantinov, Valery Zurbanov, V. Yu. Rubtsov, M.I. Rozanov, F.K. Koshel, Aleksandr Gafarov, R. Bannasch, S.V. Fialkovsky, A. V. Zagorodnikov, A.V. Korobchenko, V. M. Aynutdinov, V. A. Zhukov, Sergey Yakovlev, B.A. Shaybonov, V.F. Kulepov, A. N. Dyachok, Olga Suvorova, L. V. Pankov, V. A. Kozhin, M.B. Milenin, O. N. Gaponenko, Evgenii V Rjabov, B. A. Tarashchansky, V.I. Ljashuk, A.V. Avrorin, K.V. Golubkov, and V.A. Poleshuk

Subjects
Physics, Nuclear and High Energy Physics, business.industry, Software deployment, Detector, business, Computer hardware
Abstract

The Prototyping phase of the BAIKAL-GVD project has been started in April 2011 with the deployment of first autonomous engineering array which comprises all basic elements and systems of the Gigaton Volume Detector (GVD) in Lake Baikal. The prototyping phase will be concluded with deployment of the GVD demonstration cluster “DUBNA” in 2015, which will comprise 192 light sensors arranged at 8 strings. The first stage of the GVD demonstration cluster which consists of three strings was deployed in April 2013 and successfully operated up to February 2014. We review the prototyping phase of the BAIKAL-GVD project and describe the configuration and design of the 2013 engineering array.

Published
2015
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42. Sensitivity of the Baikal-GVD neutrino telescope to neutrino emission toward the center of the galactic dark matter halo

Author

B.A. Shaybonov, I. A. Danilchenko, A. N. Dyachok, Aleksandr Gafarov, A. V. Zagorodnikov, R. Bannasch, A. A. Perevalov, Sergei Demidov, A.A. Sheifler, A.P. Koshechkin, S.V. Fialkovsky, B.A. Tarashansky, A. A. Doroshenko, T. I. Gress, Zh.-A.M. Dzhilkibaev, E.N. Pliskovsky, A.V. Skurihin, V. Yu. Rubtzov, A.V. Kozhin, A.A. Smagina, V.I. Ljashuk, V.B. Brudanin, Olga Suvorova, V. A. Zhukov, K.V. Konischev, A.D. Avrorin, M.B. Milenin, L. V. Pankov, Valery Zurbanov, V.F. Kulepov, K.V. Golubkov, G.V. Domogatsky, E. A. Osipova, A. I. Panfilov, V. M. Aynutdinov, A.V. Korobchenko, Sergey Yakovlev, O.G. Kebkal, Z. Honz, M.I. Rozanov, I. A. Belolaptikov, Konstantin Kebkal, R. R. Mirgazov, D.Yu. Bogorodsky, E. N. Konstantinov, N. M. Budnev, D.A. Kuleshov, F.K. Koshel, O. N. Gaponenko, Evgenii V Rjabov, and A.V. Avrorin

Subjects
Physics, Annihilation, Physics and Astronomy (miscellaneous), Solid-state physics, Astrophysics::High Energy Astrophysical Phenomena, Galactic Center, Dark matter, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, law.invention, Dark matter halo, Telescope, law, High Energy Physics::Experiment, Neutrino, Sensitivity (electronics)
Abstract

We analyze sensitivity of the gigaton volume telescope Baikal-GVD for detection of neutrino signal from dark matter annihilations or decays in the Galactic Center. Expected bounds on dark matter annihilation cross section and its lifetime are found for several annihilation/decay channels.

Published
2015
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43. The processing of enriched germanium for the Majorana Demonstrator and R&D for a next generation double-beta decay experiment

Author

Ralph Massarczyk, G. K. Giovanetti, C. Wiseman, C. R. Haufe, S. Vasilyev, J. F. Wilkerson, F. E. Bertrand, Kai Vetter, N. Abgrall, I. S. Guinn, A. S. Barabash, I. Zhitnikov, Matthew Busch, D. C. Radford, M. P. Green, B. Shanks, V. E. Guiseppe, W. Xu, H. Ejiri, S. J. Meijer, J. Myslik, J. Caja, C. Dunagan, J. Rager, B. R. Jasinski, A. L. Reine, S. I. Konovalov, Yu. Efremenko, L.M. Toth, J. Gruszko, F. T. Avignone, C.M. O'Shaughnessy, R. L. Varner, C. D. Christofferson, C.-H. Yu, Reyco Henning, Keith Rielage, T. Gilliss, J. Goett, A. M. Lopez, V. Yumatov, J.H. Meyer, C. Cuesta, S. R. Elliott, R. D. Martin, A. W. Bradley, Eric W. Hoppe, K. Vorren, V.B. Brudanin, E. Yakushev, R. G. H. Robertson, T. S. Caldwell, M. Shirchenko, D. J. Tedeschi, M. Caja, Susanne Mertens, M. F. Kidd, B. X. Zhu, I. J. Arnquist, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, J.A. Reising, J. E. Trimble, Pinghan Chu, D.T. Dunstan, B. R. White, J. MacMullin, M. Buuck, and Richard T. Kouzes

Subjects
Physics, Nuclear and High Energy Physics, Isotopes of germanium, 010308 nuclear & particles physics, Detector, chemistry.chemical_element, Germanium, 7. Clean energy, 01 natural sciences, Particle detector, Semiconductor detector, ddc, Nuclear physics, MAJORANA, chemistry, Double beta decay, 0103 physical sciences, 010306 general physics, Instrumentation, Radioactive decay
Abstract

The Majorana Demonstrator is an array of point-contact Ge detectors fabricated from Ge isotopically enriched to 88% in 76 Ge to search for neutrinoless double beta decay. The processing of Ge for germanium detectors is a well-known technology. However, because of the high cost of Ge enriched in 76 Ge special procedures were required to maximize the yield of detector mass and to minimize exposure to cosmic rays. These procedures include careful accounting for the material; shielding it to reduce cosmogenic generation of radioactive isotopes; and development of special reprocessing techniques for contaminated solid germanium, shavings, grindings, acid etchant and cutting fluids from detector fabrication. Processing procedures were developed that resulted in a total yield in detector mass of 70%. However, none of the acid-etch solution and only 50% of the cutting fluids from detector fabrication were reprocessed. Had they been processed, the projections for the recovery yield would be between 80% and 85%. Maximizing yield is critical to justify a possible future ton-scale experiment. A process for recovery of germanium from the acid-etch solution was developed with yield of about 90%. All material was shielded or stored underground whenever possible to minimize the formation of 68 Ge by cosmic rays, which contributes background in the double-beta decay region of interest and cannot be removed by zone refinement and crystal growth. Formation of 68 Ge was reduced by a significant factor over that in natural abundance detectors not protected from cosmic rays.

Published
2018

44. Environmental radionuclides as contaminants of HPGe gamma-ray spectrometers: Monte Carlo simulations for Modane underground laboratory

Author

F. Piquemal, R. Breier, P. Loaiza, V.B. Brudanin, Pavel P. Povinec, E. Rukhadze, I. Stekl, N. I. Rukhadze, 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 d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Souterrain de Modane (LSM - UMR 6417), 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]), 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), 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), 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), and 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)

Subjects
Cryostat, Monte carlo simulation, Physics::Instrumentation and Detectors, Health, Toxicology and Mutagenesis, Nuclear engineering, Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010403 inorganic & nuclear chemistry, 7. Clean energy, 01 natural sciences, Radiation Monitoring, 0103 physical sciences, Environmental Chemistry, Computer Simulation, Nuclear Experiment, Waste Management and Disposal, Radioisotopes, Radionuclide, Spectrometer, 010308 nuclear & particles physics, Cold finger, Detector, Thorium, Gamma ray, Modane underground laboratory, General Medicine, Pollution, 0104 chemical sciences, Semiconductor detector, Spectrometry, Gamma, Background, 13. Climate action, Gamma Rays, HPGe gamma-spectrometry, Environmental science, Uranium, High Energy Physics::Experiment, Radioactive contaminants, France, Laboratories, Monte Carlo Method, Radioactive Pollutants
Abstract

International audience; The main limitation in the high-sensitive HPGe gamma-ray spectrometry has been the detector background, even for detectors placed deep underground. Environmental radionuclides such as 40K and decay products in the 238U and 232Th chains have been identified as the most important radioactive contaminants of construction parts of HPGe gamma-ray spectrometers. Monte Carlo simulations have shown that the massive inner and outer lead shields have been the main contributors to the HPGe-detector background, followed by aluminum cryostat, copper cold finger, detector holder and the lead ring with FET. The Monte Carlo simulated cosmic-ray background gamma-ray spectrum has been by about three orders of magnitude lower than the experimental spectrum measured in the Modane underground laboratory (4800 m w.e.), underlying the importance of using radiopure materials for the construction of ultra-low-level HPGe gamma-ray spectrometers.

Published
2018
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45. The Majorana Demonstrator Status and Preliminary Results

Author

F. E. Bertrand, W. Xu, F. T. Avignone, G. K. Giovanetti, C. J. Barton, R. L. Varner, Reyco Henning, Ralph Massarczyk, A. M. Lopez, M. Buuck, T. Gilliss, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, D. J. Tedeschi, S. Vasilyev, S. I. Konovalov, Eric W. Hoppe, C. Wiseman, R. D. Martin, T. S. Caldwell, Pinghan Chu, J. Myslik, A. S. Barabash, Walter C. Pettus, C. Dunagan, Richard T. Kouzes, Kai Vetter, V. Yumatov, Keith Rielage, I. J. Arnquist, N. W. Ruof, C.-H. Yu, C. D. Christofferson, J. Gruszko, S. R. Elliott, B. Shanks, M. F. Kidd, V. E. Guiseppe, S. Mertens, L. Hehn, M. P. Green, B. R. White, Yuen-Dat Chan, H. Ejiri, E. Yakushev, K. Vorren, M. A. Howe, G. Othman, J. Rager, J. F. Wilkerson, D. C. Radford, S. J. Meijer, I. S. Guinn, A. L. Reine, B. Z. Zhu, K. J. Keeter, V.B. Brudanin, M. Shirchenko, T. Bode, Yu. Efremenko, C. R. Haufe, S. I. Alvis, C. Cuesta, I. Zhitnikov, Matthew Busch, and Sun, Yang

Subjects
Physics, Particle physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, QC1-999, Detector, High Energy Physics::Phenomenology, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), nucl-ex, 7. Clean energy, 01 natural sciences, Lepton number, MAJORANA, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, physics.ins-det
Abstract

The Majorana Collaboration is using an array of high-purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. Searches for neutrinoless double-beta decay are understood to be the only viable experimental method for testing the Majorana nature of the neutrino. Observation of this decay would imply violation of lepton number, that neutrinos are Majorana in nature, and provide information on the neutrino mass. The Majorana Demonstrator comprises 44.1 kg of p-type point-contact Ge detectors (29.7 kg enriched in 76Ge) surrounded by a low-background shield system. The experiment achieved a high efficiency of converting raw Ge material to detectors and an unprecedented detector energy resolution of 2.5 keV FWHM at Q$_{\beta\beta}$. The Majorana collaboration began taking physics data in 2016. This paper summarizes key construction aspects of the Demonstrator and shows preliminary results from initial data., Comment: 5 pages, 2 figures. Proceeding for the "16th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics (CGS16)", 18-22 September 2017

Published
2018
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46. 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

47. Background Model for the Majorana Demonstrator

Author

S. R. Elliott, N. Snyder, M. F. Kidd, Yuen-Dat Chan, A. Hegai, M. A. Howe, A. W. P. Poon, Nicole R. Overman, A. S. Caldwell, C.-H. Yu, Yuri Efremenko, V. V. Timkin, M. P. Green, J. Gruszko, J. F. Wilkerson, S. J. Meijer, C.M. O'Shaughnessy, Jeffrey K. Thompson, J. Goett, B. Shanks, P. Finnerty, V. E. Guiseppe, K. Pushkin, B. R. White, H. Ejiri, Masaharu Nomachi, A. Galindo-Uribarri, Keith Rielage, Richard T. Kouzes, S. Vasilyev, J. Rager, Matthew Busch, O.I. Kochetov, Jonathan D. Leon, A. L. Hallin, N. Abgrall, D. Byram, J. E. Trimble, D. C. Combs, K. N. Gusev, W. Xu, D. C. Radford, Tatsushi Shima, R. D. Martin, V. Egorov, C. Wiseman, R. G. H. Robertson, Alexis G. Schubert, Eric W. Hoppe, L. E. Leviner, F. M. Fraenkle, Kai Vetter, G. K. Giovanetti, K. Vorren, J. MacMullin, Ryuta Hazama, J. C. Loach, C. D. Christofferson, Werner Tornow, E. Aguayo, Vladimir Yumatov, Stanley M. Howard, A. R. Young, Susanne Mertens, A. S. Barabash, S. MacMullin, P. J. Doe, F. E. Bertrand, M. Boswell, K. J. Keeter, V.B. Brudanin, F. T. Avignone, R. L. Varner, M. Shirchenko, Reyco Henning, John L. Orrell, Brian D. LaFerriere, E. Romero-Romero, D. G. Phillips, James E. Fast, C. Cuesta, E. Yakushev, M. C. Ronquest, S. I. Konovalov, K. J. Snavely, Anne-Marie Suriano, and J. A. Detwiler

Subjects
Physics, majorana, business.industry, Physics and Astronomy(all), germanium detector, neutrinoless double beta decay, Semiconductor detector, Reduction (complexity), Point contact, MAJORANA, Double beta decay, Pulse shape analysis, Aerospace engineering, Neutrino, Hpge detector, business
Abstract

The Majorana Collaboration is constructing a system containing 40kg of HPGe detectors to demonstrate the feasibility and potential of a future tonne-scale experiment capable of probing the neutrino mass scale in the inverted-hierarchy region. To realize this, a major goal of the Majorana Demonstrator is to demonstrate a path forward to achieving a background rate at or below 1 cnt/(ROI-t-y) in the 4 keV region of interest around the Q-value at 2039 keV. This goal is pursued through a combination of a significant reduction of radioactive impurities in construction materials with analytical methods for background rejection, for example using powerful pulse shape analysis techniques profiting from the p-type point contact HPGe detectors technology. The effectiveness of these methods is assessed using simulations of the different background components whose purity levels are constrained from radioassay measurements.

Published
2015
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48. The Majorana Low-noise Low-background Front-end Electronics

Author

L. E. Leviner, Yuen-Dat Chan, E. Aguayo, D. C. Radford, W. Xu, Eric W. Hoppe, Masaharu Nomachi, A. Hegai, C.M. O'Shaughnessy, M. A. Howe, Matthew Busch, K. J. Snavely, J. E. Trimble, Nicole R. Overman, O.I. Kochetov, J. Rager, D. Byram, K. Pushkin, J. MacMullin, P. J. Doe, A. S. Caldwell, J. Goett, S. MacMullin, D. C. Combs, S. R. Elliott, Kai Vetter, C.-H. Yu, C. D. Christofferson, B. Shanks, Keith Rielage, V. E. Guiseppe, K. J. Keeter, C. Wiseman, J. Gruszko, V. V. Timkin, V. G. Egorov, V.B. Brudanin, M. Shirchenko, K. Vorren, Ryuta Hazama, John L. Orrell, Alexis G. Schubert, M. P. Green, F. E. Bertrand, H. Ejiri, M. Boswell, Jeffrey K. Thompson, J. F. Wilkerson, Vladimir Yumatov, R. D. Martin, Stanley M. Howard, A. R. Young, P. Finnerty, Yu. Efremenko, K. N. Gusev, E. Romero-Romero, B. R. White, R. G. H. Robertson, M. C. Ronquest, D. G. Phillips, F. T. Avignone, R. L. Varner, Brian D. LaFerriere, Werner Tornow, F. M. Fraenkle, Reyco Henning, M. F. Kidd, James E. Fast, Jonathan D. Leon, C. Cuesta, A. S. Barabash, Richard T. Kouzes, S. I. Konovalov, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, E. Yakushev, N. Snyder, Susanne Mertens, A. Galindo-Uribarri, S. J. Meijer, S. Vasilyev, A. L. Hallin, N. Abgrall, Tatsushi Shima, G. K. Giovanetti, and J. C. Loach

Subjects
Physics, business.industry, Detector, chemistry.chemical_element, Germanium, Substrate (electronics), Physics and Astronomy(all), Noise (electronics), Capacitance, neutrinoless double beta decay, law.invention, Nuclear physics, MAJORANA, low noise, chemistry, law, Double beta decay, low background, Optoelectronics, charge sensitive amplifer, Resistor, business, resistive-feedback front-end
Abstract

The MAJORANA DEMONSTRATOR will search for the neutrinoless double beta decay (ββ(0ν)) of the isotope 76Ge with a mixed array of enriched and natural germanium detectors. In view of the next generation of tonne-scale germanium-based ββ(0ν)-decay searches, a major goal of the MAJORANA DEMONSTRATOR is to demonstrate a path forward to achieving a background rate at or below 1 cnt/(ROI-t-y) in the 4 keV region of interest (ROI) around the 2039-keV Q-value of the 76Ge ββ(0ν)-decay. Such a requirement on the background level significantly constrains the design of the readout electronics, which is further driven by noise and energy resolution performances. We present here the low-noise low- background front-end electronics developed for the low-capacitance p-type point contact (P-PC) germanium detectors of the MAJORANA DEMONSTRATOR. This resistive-feedback front-end, specifically designed to have low mass, is fabricated on a radioassayed fused-silica substrate where the feedback resistor consists of a sputtered thin film of high purity amorphous germanium and the feedback capacitor is based on the capacitance between gold conductive traces.

Published
2015
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49. Low Background Materials and Fabrication Techniques for Cables and Connectors in the Majorana Demonstrator

Author

T. Gilliss, R. D. Martin, R. G. H. Robertson, C. J. Barton, V.B. Brudanin, G. K. Giovanetti, B. Shanks, V. E. Guiseppe, I. J. Arnquist, J. F. Wilkerson, S. J. Meijer, A. S. Barabash, B. R. White, Keith Rielage, M. Busch, Eric W. Hoppe, M. A. Howe, Kai Vetter, C.M. O'Shaughnessy, C. D. Christofferson, F. T. Avignone, A. W. P. Poon, M. Shirchenko, K. Vorren, T. S. Caldwell, M. F. Kidd, J. Rager, H. Ejiri, Steven Elliott, V. Yumatov, A. L. Reine, Yu. Efremenko, C. Wiseman, I. S. Guinn, Reyco Henning, A. M. Lopez, D. C. Radford, Chang-Hong Yu, J. Myslik, Susanne Mertens, E. Yakushev, M. Buuck, N. W. Rouf, C. Cuesta, W. Xu, Y-D. Chan, Richard T. Kouzes, Ralph Massarczyk, S. Vasilyev, N. Abgrall, A. W. Bradley, Anne-Marie Suriano, T. Bode, M. P. Green, J. Gruszko, C. R. Haufe, S. I. Alvis, I. Zhitnikov, K. J. Keeter, D. Tedeschi, L. Hehn, J. E. Trimble, G. Othman, Pinghan Chu, F. E. Bertrand, S. I. Konovalov, B. X. Zhu, J. A. Detwiler, C. Dunagan, and R. L. Varner

Subjects
Cryostat, MAJORANA, Fabrication, Reliability (semiconductor), Upgrade, Physics - Instrumentation and Detectors, Computer science, Detector, Systems engineering, FOS: Physical sciences, Electronics, Instrumentation and Detectors (physics.ins-det), physics.ins-det
Abstract

The MAJORANA Collaboration is searching for the neutrinoless double-beta decay of the nucleus Ge-76. The MAJORANA DEMONSTRATOR is an array of germanium detectors deployed with the aim of implementing background reduction techniques suitable for a tonne scale Ge-76-based search (the LEGEND collaboration). In the DEMONSTRATOR, germanium detectors operate in an ultra-pure vacuum cryostat at 80 K. One special challenge of an ultra-pure environment is to develop reliable cables, connectors, and electronics that do not significantly contribute to the radioactive background of the experiment. This paper highlights the experimental requirements and how these requirements were met for the MAJORANA DEMONSTRATOR, including plans to upgrade the wiring for higher reliability in the summer of 2018. Also described are requirements for LEGEND R&D efforts underway to meet these additional requirements., Proceedings of LRT 2017

Published
2017
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50. The status and initial results of the Majorana demonstrator experiment

Author

V. Yumatov, Yu. Efremenko, V.B. Brudanin, Anne-Marie Suriano, M. Busch, Ralph Massarczyk, Keith Rielage, F. T. Avignone, S. Vasilyev, R. L. Varner, Reyco Henning, A. M. Lopez, J. E. Trimble, N. Abgrall, J. A. Detwiler, Pinghan Chu, C. Dunagan, D. C. Radford, K. J. Keeter, G. Othman, D. Tedeschi, C. J. Barton, G. K. Giovanetti, I. J. Arnquist, L. Hehn, Eric W. Hoppe, T. S. Caldwell, C. Wiseman, B. Shanks, T. Bode, V. E. Guiseppe, J. Gruszko, A. W. P. Poon, N. W. Rouf, T. Gilliss, F. E. Bertrand, R. D. Martin, A. W. Bradley, J. Myslik, S. I. Konovalov, B. X. Zhu, R. G. H. Robertson, Chang-Hong Yu, C.M. O'Shaughnessy, I. S. Guinn, C. R. Haufe, S. I. Alvis, I. Zhitnikov, J. Rager, H. Ejiri, Steven Elliott, M. A. Howe, J. F. Wilkerson, B. R. White, M. Shirchenko, C. Cuesta, W. Xu, Y-D. Chan, M. P. Green, K. Vorren, M. Buuck, S. J. Meijer, A. L. Reine, Susanne Mertens, E. Yakushev, Kai Vetter, C. D. Christofferson, M. F. Kidd, Richard T. Kouzes, and A. S. Barabash

Subjects
Physics, Particle physics, MAJORANA, Physics - Instrumentation and Detectors, Detector, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), Neutrino, nucl-ex, Nuclear Experiment, physics.ins-det, Lepton
Abstract

Neutrinoless double-beta decay searches play a major role in determining the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The MAJORANA Collaboration assembled an array of high purity Ge detectors to search for neutrinoless double-beta decay in Ge-76. The MAJORANA DEMONSTRATOR is comprised of 44.1 kg (29.7 kg enriched in Ge-76) of Ge detectors divided between two modules contained in a low-background shield at the Sanford Underground Research Facility in Lead, South Dakota, USA. The initial goals of the DEMONSTRATOR are to establish the required background and scalability of a Ge-based next-generation ton-scale experiment. Following a commissioning run that started in 2015, the first detector module started low-background data production in early 2016. The second detector module was added in August 2016 to begin operation of the entire array. We discuss results of the initial physics runs, as well as the status and physics reach of the full MAJORANA DEMONSTRATOR experiment., Proceedings of the MEDEX'17 meeting (Prague, May 29 - June 2, 2017)

Published
2017
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