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1. Improved limits on $\beta^+$EC and ECEC processes in $^{74}$Se

Author

G. Warot, A. V. Rakhimov, Yu. Shitov, N. I. Rukhadze, I. Stekl, A. A. Klimenko, S. I. Konovalov, A. S. Barabash, E. Rukhadze, V. B. Brudanin, V.I. Umatov, 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)-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), and 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)

Subjects
Physics, Nuclear and High Energy Physics, Double electron capture, 010308 nuclear & particles physics, Double-beta decay, Analytical chemistry, chemistry.chemical_element, Low-background HPGe detector, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], External source, 01 natural sciences, chemistry, Double beta decay, Excited state, 0103 physical sciences, 010306 general physics, Hpge detector, Nuclear Experiment, Selenium
Abstract

New limits on $\beta^+$EC and ECEC processes in $^{74}$Se have been obtained using a 600 cm$^3$ HPGe detector and an external source consisting of 1600 g of a natural selenium powder. For different $\beta^+$EC and ECEC transitions (to the ground and excited states) obtained limits are on the level $\sim (0.2-4.8)\times10^{19}$ yr at 90\% C.L. In particular, for the potentially resonant transition into the 1204.2 keV excited state of $^{74}$Ge a lower half-life limit of $1.1\times10^{19}$ yr at 90\% C.L. has been obtained. Possibility to increase the sensitivity of such measurements is discussed., Comment: 16 pages, 3 figures. arXiv admin note: text overlap with arXiv:hep-ex/0610046

Published
2020
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2. Searching for the $\beta^+$EC and EC/EC Decays of $^{74}$Se

Author

E. Rukhadze, V.I. Umatov, V. B. Brudanin, Yu. Shitov, S. I. Konovalov, I. Stekl, N. I. Rukhadze, A. S. Barabash, G. Warot, A. V. Rakhimov, A. A. Klimenko, 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), and 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])

Subjects
Hadron, Analytical chemistry, General Physics and Astronomy, lifetime: measured, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Water equivalent, 7. Clean energy, 01 natural sciences, energy: transition, background: low, double-beta decay: (0neutrino), Double beta decay, 0103 physical sciences, double-beta decay: (2neutrino), 010302 applied physics, Physics, 010308 nuclear & particles physics, selenium: lifetime, neutrino: Majorana: mass, neutrino: exchange, selenium: semileptonic decay, nucleus: transition, Excited state, Underground laboratory, Hpge detector, selenium: nuclide, experimental results
Abstract

International audience; Double beta decay (β$^{+}$EC, EC/EC) of $^{74}$Se was investigated at the Modane underground laboratory (LSM, France; 4800 m of water equivalent) using the OBELIX ultralow-background HPGe detector with a sensitive volume of 600 cm$^{3}$ and a sample of natural selenium with a mass of 1.6 kg containing ~0.89% (~14.24 g) of $^{74}$Se. The new experimental limits for β$^{+}$EC and EC/EC decays of $^{74}$Se to ground 0$^{+}$ and excited $2_{1}^{ + },$ 596 keV, and $2_{2}^{ + },$ 1204 keV states of $^{74}$Ge, were obtained from experimental data accumulated over 135 days.

Published
2020
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3. The Low-Background HPGE Γ-Spectrometer OBELIX for the Investigation of the Double Beta Decay to Excited States

Author

A. A. Klimenko, V. G. Egorov, E. Rukhadze, G. Warot, N. I. Rukhadze, P. Loaiza, Yu. Shitov, R. Hodák, I. Stekl, M. Zampaolo, F. Mamedov, F. Piquemal, E. A. Yakushev, and V. B. Brudanin

Subjects
Nuclear physics, Physics, Spectrometer, Double beta decay, Excited state, 010403 inorganic & nuclear chemistry, 01 natural sciences, 0104 chemical sciences, Semiconductor detector
Published
2017
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4. 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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5. Investigating the Double Beta Decay of $^{58}$Ni

Author

A. A. Klimenko, V. B. Brudanin, F. Piquemal, I. Stekl, E. Rukhadze, N. I. Rukhadze, Yu. Shitov, G. Warot, 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)-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
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], energy: ground state, Hadron, Analytical chemistry, energy spectrum, General Physics and Astronomy, Water equivalent, 7. Clean energy, 01 natural sciences, Preliminary analysis, energy: transition, nickel, double-beta decay: (0neutrino), Double beta decay, 0103 physical sciences, double-beta decay: (2neutrino), 010306 general physics, Physics, 010308 nuclear & particles physics, excited state: energy, semileptonic decay, 3. Good health, nucleus: transition, Excited state, Underground laboratory, Ground state, Hpge detector
Abstract

Double beta decay (β + EC, EC/EC) of 58Ni is investigated at France’s Modane Underground Laboratory (4800 m water equivalent) using the OBELIX ultralow-background HPGe detector with a sensitive volume of 600 cm3 and a natural nickel sample of ~68% 58Ni with a mass of ~21.7 kg. After preliminary analysis of the experimental data accumulated over ~144 days, new experimental limits are obtained for the 2νβ+EC decay of 58Ni to the 0+ ground state and the 2 1 + , 811 keV excited state of 58Fe, and for the 2νEC/EC decay of 58Ni to the 2 1 + , 811 keV and 2 2 + , 1675 keV excited states of 58Fe. The limits are T1/2(β+EC,0→0+) > 1.7 × 1022 yr, T1/2(β+EC,0→2 1 + ) > 2.3 × 1022 yr, T1/2(EC/EC,0→2 1 + ) > 3.3 × 1022 yr, and T1/2(EC/EC,0→2 2 + ) > 3.4 × 1022 yr. Experimental limit T1/2(0νEC/EC–res, 1918 keV > 4.1 × 1022 yr is obtained for resonant neutrinoless radiative EC/EC decay with an energy of 1918.3 keV. All limits are at 90% CL.

Published
2018
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6. Investigation of double beta decay of $^{58}$Ni with the Obelix spectrometer

Author

F. Piquemal, N. I. Rukhadze, G. Warot, E. Rukhadze, A. A. Klimenko, Yu. Shitov, V. B. Brudanin, I. Stekl, 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), and Centre National de la Recherche Scientifique (CNRS)-Université 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
energy: ground state, Analytical chemistry, energy spectrum, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, energy: transition, nickel, double-beta decay: (0neutrino), Double beta decay, 0103 physical sciences, double-beta decay: (2neutrino), 010306 general physics, Physics, Spectrometer, 010308 nuclear & particles physics, excited state: energy, semileptonic decay, Nickel, nucleus: transition, chemistry, Excited state, Underground laboratory, spectrometer, Hpge detector
Abstract

International audience; Investigation of double beta decay processes (β+EC, EC/EC) of 58Ni was performed at the Modane underground laboratory (LSM, France, 4800 m w.e.) using ultra low-background HPGe detector Obelix with sensitive volume of 600 cm3 and a sample of natural nickel, containing ∼68% of 58Ni with a mass of ∼21.7 kg. New experimental limits on 2νβ+EC decay of 58Ni to the ground 0+ and 21+, 811 keV excited state of 58Fe, and 2νEC/EC decay of 58Ni to 21+, 811 keV and 22+ 1 675 keV excited states of 58Fe were obtained from the preliminary calculation of experimental data accumulated in ∼88d. They are - T1/2(β+ EC, 0+ → 0+) > 1.4 ×1021 y; T1/2(β+EC,0+→21+)>1.7×1022 y, T1/2(EC/EC, 0+→21+)>2.4×1022 y, T1/2(EC/EC, 0+→22+)>2.1×1022 y. For resonant neutrino-less radiative EC/EC decay with energy of 1 918.3 keV a new experimental limit of T1/2 (0νEC/EC − res, 1918keV) > 4.7 ×1022 y was also obtained. All limits are at 90 % CL.

Published
2017
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7. A highly efficient HPGE gamma-ray spectrometer for investigating ββ decay to excited states

Author

G. Warot, F. Mamedov, I. Stekl, P. Čermák, Yu. Shitov, O.I. Kochetov, V. B. Brudanin, E. A. Yakushev, Ch. Briançon, F. Piquemal, M. Zampaolo, N. I. Rukhadze, E. Rukhadze, and P. Loaiza

Subjects
Physics, Decay scheme, Spectrometer, Physics::Instrumentation and Detectors, Electron capture, Gamma ray, General Physics and Astronomy, Resonance, Semiconductor detector, Nuclear physics, Excited state, Double beta decay, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment
Abstract

A new low-background spectrometer based on a HPGe detector with a sensitive volume of 600 cm3 is developed to investigate rare nuclear processes such as resonance neutrinoless double electron capture and two-neutrino double beta decay to excited states of daughter nuclei. The spectrometer is installed at the Modane underground laboratory (France) at a depth of 4800 m w.e. The spectrometer background is measured and the spectrometer sensitivity is determined for measuring sources of double beta decay.

Published
2013
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8. Effect of recrystallisation on the radioactive contamination of CaWO4 crystal scintillators

Author

I.M. Solsky, G. Warot, S.S. Nagorny, F.A. Danevich, Stefano Nisi, V.B. Mikhailik, V. V. Kobychev, A. S. Nikolaiko, P. Loaiza, H. Kraus, Matthias Laubenstein, and Ian Bailiff

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Radiochemistry, chemistry.chemical_element, Crystal growth, Uranium, Scintillator, Crystal, chemistry, Radioactive contamination, Instrumentation, Single crystal, Order of magnitude
Abstract

Minimising intrinsic radioactivity of crystal scintillators is of particular importance for experiments searching for rare events. We studied the impact of the crystal production process (recrystallisation) on the level of radioactive contamination of CaWO4 crystal scintillators. Several samples of single crystal scintillators were produced using the recrystallisation procedure. It is shown that this has a significant effect on the radioactive contamination of the crystals. Depending on the stage of recrystallisation the activity due to 210Po (product of 210Pb decay) varies in the range 0.031.32 Bq kg-1 while the activity of 238U varies from 0.04 to 0.33 Bq kg-1. We found that uranium is rejected by the crystal with a segregation coefficient ≈0.3. The improvement in radiopurity of CaWO4 by one order of magnitude due to recrystallisation has been demonstrated. The additional benefit of this process is the improvement in the energy resolution. A programme to develop radiopure CaWO4 crystal scintillators is discussed briefly. © 2010 Elsevier B.V. All rights reserved.

Published
2016

9. Investigation of double beta decay of 100Mo to excited states of 100Ru

Author

Frédéric Nowacki, C. Cerna, Pavel P. Povinec, J. Mott, Karel Smolek, Ph. Hubert, S. Blondel, O.I. Kochetov, C. Vilela, A. Žukauskas, B. Soulé, Vl.I. Tretyak, Fedor Šimkovic, C.S. Sutton, S. Jullian, J. J. Evans, V.B. Brudanin, L. Dragounová, Masaharu Nomachi, H. Gómez, V. Egorov, G. Eurin, A.A. Smolnikov, I. Stekl, Igor Nemchenok, A.J. Caffrey, Vit Vorobel, E. Chauveau, A. A. Klimenko, R. Hodák, S. Blot, V. I. Umatov, A. Smetana, R. Arnold, P. Guzowski, V. Kovalenko, Y. Lemière, R. Saakyan, F. Perrot, C. Augier, A. Chapon, S. I. Konovalov, X. Garrido, J. L. Reyss, P. Čermák, V. V. Timkin, S. Söldner-Rembold, R. B. Pahlka, A. S. Barabash, D. Duchesneau, M. Bongrand, Guillaume Lutter, J. Hůlka, Z. J. Liptak, Catherine Marquet, F. Nova, Karol Lang, E. Rukhadze, F. Mauger, B. Morgan, V.I. Tretyak, C. L. Riddle, A. Remoto, P. Loaiza, H. Ohsumi, Dominique Durand, A. Basharina-Freshville, Jouni Suhonen, D. Lalanne, Yu. Shitov, Juergen Thomas, G. Szklarz, L. Simard, F. Piquemal, Y. A. Ramachers, B. Richards, S. Torre, F. Mamedov, C. Hugon, X. Sarazin, D. Waters, G. Warot, N.I. Rukhadze, R. L. Flack, J. Busto, B. Guillon, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Neutrino et Faibles Radioactivités (NEMO), 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)-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 de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), 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]), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Océan et Interfaces (OCEANIS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), NEMO-3, Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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)-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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), and Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, ta114, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], External source, 7. Clean energy, 3. Good health, Nuclear physics, Excited state, Excited nucleus, Double beta decay, Nuclear Experiment (nucl-ex), Atomic physics, Hpge detector, Nuclear Experiment
Abstract

Double beta decay of $^{100}$Mo to the excited states of daughter nuclei has been studied using a 600 cm$^3$ low-background HPGe detector and an external source consisting of 2588 g of 97.5% enriched metallic $^{100}$Mo, which was formerly inside the NEMO-3 detector and used for the NEMO-3 measurements of $^{100}$Mo. The half-life for the two-neutrino double beta decay of $^{100}$Mo to the excited 0$^+_1$ state in $^{100}$Ru is measured to be $T_{1/2}=[7.5 \pm{0.6}(stat) \pm {0.6}(syst)]\cdot 10^{20}$ yr. For other $(0\nu + 2\nu)$ transitions to the 2$^+_1$, 2$^+_2$, 0$^+_2$, 2$^+_3$ and 0$^+_3$ levels in $^{100}$Ru, limits are obtained at the level of $\sim (0.25-1.1)\cdot 10^{22}$ yr., Comment: 19 pages, 4 figures. arXiv admin note: text overlap with arXiv:0904.1924

Published
2014
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10. Low background germanium planar detector for gamma-ray spectrometry

Author

J. L. Reyss, P. Loaiza, A. Nachab, G. Warot, C. Chassaing, Ph. Hubert, F. Perrot, 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), CANBERRA France, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Océan et Interfaces (OCEANIS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université 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 de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, Resolution (mass spectrometry), gamma-ray spectrometry, 010308 nuclear & particles physics, business.industry, Monte Carlo method, Detector, Gamma ray, Analytical chemistry, chemistry.chemical_element, Germanium, Low-background, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Optics, Planar, chemistry, 0103 physical sciences, 010306 general physics, business, Instrumentation, Monte Carlo simulation, Line (formation)
Abstract

A new ultra-low background planar germanium spectrometer has been developed. The planar geometry improves the sensitivity and energy resolution below 600 keV. The integral background counting rate in the Laboratoire Souterrain de Modane (4800 m water equivalent) in the energy range from 20 to 1500 keV for the planar Ge (mass=800 g) is 140 count/day. After 40 days of statistics, the background counting rates for all expected single lines are below 0.5 count/day with the exception of 210Pb(46-keV line) which was measured to be (1.76±0.25) count/day. Monte Carlo simulations have been performed to explain the origin of the remaining background and to calculate the detection efficiencies. Sensitivities around 1 mBq/kg are obtained within few days of statistics for 226Ra and 228Th. The main achievement is the high sensitivities for 210Pb (46-keV line) and 238U (234Th: 63 and 93 keV lines). For an aluminium sample (mass=1 kg) the limits obtained in 15 days are 210 Pb 9 mBq / kg and 238 U 3 mBq / kg .

Published
2011
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11. Alpha-emitter induced soft-errors in CMOS 130nm SRAM: Real-time underground experiment and Monte-Carlo simulation

Author

P. Loaiza, S. Sauze, Gilles Gasiot, J.L. Autran, Sebastien Martinie, S. Uznanski, Daniela Munteanu, G. Warot, Philippe Roche, and M. Zampaolo

Subjects
Physics, CMOS, Nuclear engineering, Monte Carlo method, Semiconductor device modeling, Electronic engineering, Proportional counter, Neutron, Secular equilibrium, Static random-access memory, Common emitter
Abstract

This work reports a long-duration (> 2 years) realtime characterization study of SRAM memories at the underground laboratory of Modane (LSM) to quantify alphaemitter radioactive impurities present in the circuit materials and responsible of soft-errors detected in absence of atmospheric neutrons. Experimental data have been obtained using ∼3.5 Gbit of SRAMs manufactured in CMOS 130 nm technology. In a second part of this work, the underground experiment is simulated using a Monte-Carlo code to extract the contamination level related to the disintegration chain of uranium in silicon at secular equilibrium. Results are finally compared to data obtained from experimental counting experiments using an ultra low background alpha-particle gas proportional counter.

Published
2010
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