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1. 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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2. Investigation of $\beta^+$EC, EC/EC processes in $^{74}$Se

Author

G. Warot, A. V. Rakhimov, V. B. Brudanin, I. Stekl, N. I. Rukhadze, V. I. Umatov, E. Rukhadze, S. I. Konovalov, Yu. A. Shitov, A. A. Klimenko, A. S. Barabash, 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
Materials science, 010308 nuclear & particles physics, Radiochemistry, selenium: lifetime, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, energy: transition, neutrino: exchange, background: low, nucleus: transition, selenium: semileptonic decay, Volume (thermodynamics), chemistry, double-beta decay: (0neutrino), Double beta decay, 0103 physical sciences, Underground laboratory, double-beta decay: (2neutrino), 010306 general physics, Hpge detector, selenium: nuclide, Selenium, experimental results
Abstract

International audience; Investigation of double beta decay processes (β+EC, EC/EC) of 74Se 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 selenium with a mass of 1.6 kg, containing ∼0.89% (∼14.24 g) of 74Se. New experimental limits (at 90 % CL) on double beta decay transitions of 74Se to the ground and exited states of 74Ge were obtained from the preliminary calculation of experimental data accumulated in 135 days.

Published
2019
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3. 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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4. Investigation of double beta decay of $^{58}$Ni at the Modane Underground Laboratory

Author

E. Rukhadze, N. I. Rukhadze, G. Warot, F. Piquemal, A. A. Klimenko, I. Stekl, Yu. Shitov, V. B. Brudanin, Laboratoire Souterrain de Modane (LSM - UMR 6417), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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
History, 010308 nuclear & particles physics, Analytical chemistry, electron: capture, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Computer Science Applications, Education, talk: Sudbury 2017/07/24, nickel, double-beta decay: (0neutrino), Double beta decay, Excited state, 0103 physical sciences, Underground laboratory, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Hpge detector, nucleus: excited state, experimental results, semiconductor detector: germanium
Abstract

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.). A sample of natural nickel, containing ∼68% of 58Ni and a mass of ∼21.7 kg, was measured using ultra low-background HPGe detector Obelix (sensitive volume of 600 cm3) during ∼143.8 days. New experimental limits on 2νβ+EC decay of 58Ni to the ground 0+ and (math), 811 keV excited state of 58Fe, and 2νEC/EC decay of 58Ni to (math), 811 keV and (maht), 1 675 keV excited states of 58Fe were obtained in this measurement. There are -T1/2(β+EC, 0+ → 0+) > 1.7 × 1022 y; (math), (math), (math). 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) > 4.1 ×1022 y was also obtained. All limits are at 90 % CL.

Published
2017
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5. 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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6. Search for double beta decay of $^{106}$Cd in the TGV-2 experiment

Author

S. V. Rozov, N. I. Rukhadze, E. A. Yakushev, F. Piquemal, V. V. Timkin, V. B. Brudanin, P. Kouba, Fedor Šimkovic, A. Kovalík, A. A. Klimenko, V. G. Egorov, E. Rukhadze, A.V. Salamatin, Yu. Shitov, I. Stekl, Laboratoire Souterrain de Modane (LSM - UMR 6417), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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 [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, History, Spectrometer, 010308 nuclear & particles physics, Analytical chemistry, Resonance, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Beta decay, Particle detector, Computer Science Applications, Education, Semiconductor detector, Nuclear physics, Isotopes of cadmium, Double beta decay, 0103 physical sciences, 010306 general physics, Radioactive decay
Abstract

International audience; A new experimental run of searching for double beta decay of (106)Cd was performed at the Modane underground laboratory (LSM, France, 4800 m w.e.) using the TGV-2 spectrometer, consisting of 32 planar type HPGe detectors with a total sensitive volume of ~400 cm(3). 16 foils of (106)Cd with an enrichment of 99.57% and a total mass of ~ 23.2 g were inserted between the entrance windows of face-to-face detectors. The limit on 2vEC/EC decay of (106)Cd - T(1/2) > 3.7 × 10(20) y at 90% C.F was obtained from the preliminary calculation of experimental data accumulated for 8198 h of measurement. The limits on the resonance OvEC/EC decay of (106)Cd were obtained from the measurement of ~23.2 g of (106)Cd with the low-background HPGe spectrometer Obelix lasted 395 h -T(1/2) (KF, 2741 keV) > 0.9 × 10(20) y and T(1/2) (KK, 2718 keV) > 1.4 × 10(20) y at 90% C.L.

Published
2015
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7. New search for double electron capture in Cd-106 decay with the TGV-2 spectrometer

Author

Lukas Fajt, V. B. Brudanin, V. G. Egorov, E. Rukhadze, A.V. Salamatin, J. M. Jose, R. Hodák, S. V. Rosov, Yu. Shitov, A. A. Klimenko, N. I. Rukhadze, A. Kovalík, Ch. Briançon, V. V. Timkin, M. Špavorova, E. A. Yakushev, F. Šimkovic, I. Stekl, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, [PHYS]Physics [physics], Nuclear and High Energy Physics, Isotope, Spectrometer, 010308 nuclear & particles physics, Stable isotope ratio, Electron capture, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Atomic and Molecular Physics, and Optics, Nuclear physics, Double beta decay, Isotopes of cadmium, 0103 physical sciences, Gamma spectroscopy, DOUBLE-BETA DECAY, 010306 general physics, Radioactive decay
Abstract

International audience; A new experiment devoted to searches for double electron capture in Cd-106 decay is being performed at the Modane underground laboratory (4800 mwe) with the 32-detector TGV-2 spectrometer. The limit T (1/2)(2 nu EC/EC) > 2.0x10(20) yr at a 90%confidence level (C.L.) was obtained from a preliminary analysis of data obtained over 2250 h of measurements with about 23.2 g sample enriched in the isotope Cd-106 to 99.57%. The limits T (1/2)(KL, 2741 keV) > 0.9 x 10(20) yr and T (1/2)(KK, 2718 keV) a parts per thousand << 1.4 x 10(20) yr at a 90% C.L. on the neutrinoless decay of Cd-106 were obtained from measurements performed with the Obelix low-background spectrometer from high-purity germanium (HPGe spectrometer) for a sample of mass about 23.2 g enriched in the isotope Cd-106.

Published
2015
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8. New limits on double beta decay of 106Cd

Author

P. Čermák, V. G. Egorov, Ch. Briançon, A. M. Bakalyarov, V. I. Lebedev, A. A. Klimenko, N. I. Rukhadze, V. B. Brudanin, V. V. Timkin, I. Stekl, A. Kovalík, S. V. Zhukov, F. Mamedov, Fedor Šimkovic, Yu. Shitov, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and 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)

Subjects
Nuclear and High Energy Physics, I (KX-ray), Electron capture, Comparison with calculations, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Eγ, Double beta decay, Phase (matter), 0103 physical sciences, Iγ, measured E(KX-ray), 010306 general physics, RADIOACTIVITY 106Cd(2EC), Physics, Spectrometer, 010308 nuclear & particles physics, deduced T1/2 lower limits for double- and zero-neutrino decay, Modane underground laboratory, Excited state, (KX-ray)γ -coin using TGV-2 spectrometer, Underground laboratory, (KX-ray)(KX-ray), Atomic physics, Ground state
Abstract

Investigation of double electron capture in 106Cd was performed at the Modane underground laboratory (4800 m.w.e.) using the multi-detector spectrometer TGV-2. In Phase I of the experiment, ∼10 g of 106Cd with an enrichment of 75% was measured during 8687 hours. In Phase II, the TGV-2 background was significantly suppressed in comparison with Phase I and the 106Cd mass was increased to ∼13.6 g. New half-life limits (at 90% CL) were obtained for 2νEC/EC decay of 106Cd to the ground state of Pd 106 – T 1 / 2 > 3.0 × 10 20 y (Phase I) and T 1 / 2 > 3.6 × 10 20 y (Phase II, 9000 hours), and for 0νEC/EC decay of 106Cd to the 2741 keV excited state of Pd 106 – T 1 / 2 > 1.1 × 10 20 y (Phase II).

Published
2011
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9. Experiment TGV II - results of Phases I and II

Author

Ch. Briançon, V. B. Brudanin, P. Čermák, V. G. Egorov, A. A. Klimenko, A. Kovalík, F. Mamedov, N. I. Rukhadze, V. G. Sandukovski, Yu. A. Shitov, F. Šimkovic, I. Stekl, V. V. Timkin, Ts. Vylov, D. R. Zinatulina, Osvaldo Civitarese, Ivan Stekl, Jouni Suhonen, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and 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)

Subjects
Physics, 010308 nuclear & particles physics, Electron capture, DOUBLE-BETA-DECAY, Nuclear structure, double beta decay, CD-106, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Neutrino scattering, Nuclear physics, neutrino, double electron capture, (106)Cd, Double beta decay, SEARCH, 0103 physical sciences, Underground laboratory, Neutrino, 010306 general physics, Ground state
Abstract

International audience; Currently, the TGV collaboration is investigating the two-neutrino double electron capture (2 nu EC/EC) of (106)Cd at the Modane underground laboratory. The study is performed with low-background multi-HPGe detector TGV II, which has been constructed for measurements of the rare processes. The half-life limits of T(1/2) > 2.6 x 10(20) years (for Phase I, 8687 hours) and T(1/2) > 3.6 x 10(20) years (for Phase II, 9003 hours) were obtained for the ground state to ground state 2 nu EC/EC of (106)Cd. The results already allow to rule out some of the previous nuclear structure calculations.

Published
2009
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10. Search for double beta decay of 106Cd in TGV-2 experiment

Author

Yu. Shitov, V. G. Egorov, A. A. Klimenko, N. I. Rukhadze, V. B. Brudanin, V. V. Timkin, P. Čermák, Ts. Vylov, A. Kovalík, I. Stekl, Ch. Briançon, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and 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)

Subjects
Physics, History, Isotope, 010308 nuclear & particles physics, Analytical chemistry, Half-life, 23.40.-s Beta decay, double beta decay, electron and muon capture 29.40.Wk Solid-state detectors 27.60.+j 90(less-than-or-equal-to)A(less-than-or-equal-to)149, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Beta decay, Particle detector, Computer Science Applications, Education, Isotopes of palladium, Isotopes of cadmium, Double beta decay, 0103 physical sciences, Atomic physics, 010306 general physics, Radioactive decay
Abstract

International audience; Search for double beta decay (β+β+, β+/EC, EC/EC) of 106Cd was performed at the Modane underground laboratory (4800 m w.e.) using a spectrometer TGV-2 with 32 HPGe detectors. New limits on the half-lives of 0vEC/EC resonant decay - T1/2 ≥ 1.6 × 1020 y, and on 2vEC/EC decay of 106Cd − T1/2 ≥ 4.1 × 1020 y (at 90% CL) were obtained from preliminary calculations of experimental data accumulated for 12900 h of measurement of ~13.6 g of 106Cd with enrichment of 75%. The limits on 2vEC/EC decay of 106Cd to the 2+,512 keV and 0+1,1334 keV excited states of 106Pd and on 2vβ+β+ and 2vβ+/EC decay of 106Cd were improved

Published
2009
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11. The TGV II Experiment (Phase I Results)

Author

P. Beneš, Ch. Briançon, V. B. Brudanin, P. Čermák, V. G. Egorov, K. N. Gusev, A. A. Klimenko, V. E. Kovalenko, A. Kovalik, N. I. Rukhadze, A. V. Salamatin, F. Šimkovic, I. Štekl, V. V. Timkin, Ts. Vylov, Osvaldo Civitarese, Ivan Stekl, Jouni Suhonen, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and 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)

Subjects
Physics, Spectrometer, 010308 nuclear & particles physics, Orders of magnitude (temperature), Electron capture, Phase (waves), chemistry.chemical_element, Germanium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Semiconductor detector, law.invention, Nuclear physics, Telescope, chemistry, law, Double beta decay, 0103 physical sciences, 010306 general physics
Abstract

International audience; The TGV II (Telescope Germanium Vertical) facility is a low background spectrometer operated in Modane Underground Laboratory. It aims at the study of double electron capture of 106Cd. The spectrometer is composed of 32 HPGe planar detectors interleaved with thin‐foil samples made of Cd‐106 enriched to 75% (total mass about 10 g). In 2006, the main run of phase I (1 year duration) was terminated yielding a new limit on half‐life for two‐neutrino double electron capture (g.s.→g.s.) in 106Cd as 2.0×1020 years. This limit is significantly higher (by almost three orders of magnitude) than those already published. © 2007 American Institute of Physics

Published
2007
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12. First results for the measurement of double-electron capture of $^{106}$Cd in the experiment TGV II

Author

V. G. Egorov, P. Čermák, Petr Beneš, V.B. Brudanin, V. E. Kovalenko, A.V. Salamatin, Ch. Briançon, K. N. Gusev, I. Stekl, A. A. Klimenko, N. I. Rukhadze, A. Kovalík, V. V. Timkin, Ts. Vylov, Fedor Šimkovic, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Spectrometer, 010308 nuclear & particles physics, Electron capture, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Double beta decay, Excited state, 0103 physical sciences, Underground laboratory, Atomic physics, 010306 general physics
Abstract

Present status of the experiment TGV II which is devoted to the measurement of double-beta decay of 106Cd is given. The low background spectrometer TGV II is installed in the Modane Underground Laboratory and has been running from February 2005 with approx 10 grams of 106Cd enriched at 75%. After an analysis of 3736 hours of experimental data the new improved half-life limit for 2νEC/EC decay of 106Cd (0 g.s. + → 0 g.s. + ) is given as T 1 2/2 > 4.8 × 1019 years (90% CL). The search for 2νEC/EC decay of 106Cd to the excited states of 106Pd allows to determine the limits of the half-lives T 1 2/2 (0 g.s. + → 2 1 + ) > 3.9 × 1019 years (90% CL) and T 1 2/2 (0 g.s. + → 0 1 + ) > 5.8 × 1019 years (90% CL).

Published
2005
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13. Search for double beta decay of $^{48}$Ca in the TGV experiment

Author

N. I. Rukhadze, I. Stekl, V.V. Tsoupko-Sitnikov, V. G. Egorov, P. Čermák, Ch. Briançon, Ts. Vylov, A.V. Salamatin, V.E. Kovalenko, V. B. Brudanin, A. Kovalík, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and 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)

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, chemistry.chemical_element, Germanium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, law.invention, Telescope, Nuclear physics, chemistry, law, Double beta decay, 0103 physical sciences, Sensitivity (control systems), 010306 general physics
Abstract

This Letter describes a collaborative TGV (Telescope Germanium Vertical) study of the double beta decay of 48Ca with a low-background and high sensitivity Ge multi-detector spectrometer. The results of T1/22νββ=(4.2+3.3−1.3)×1019 years and T1/20νββ>1.5×1021 years (90% CL) for double beta decay of 48Ca were found after processing experimental data obtained after 8700 hours of measuring time, using approximately 1 gramme of 48Ca. The features of a TGV-2 experiment are also presented.

Published
2000

14. The high sensitivity double beta spectrometer TGV

Author

I. Stekl, A.V. Salamatin, V. G. Egorov, V. V. Timkin, Ch. Briançon, N. I. Rukhadze, Ts. Vylov, J. Kubasta, V. B. Brudanin, V.V. Tsupko-Sitnikov, A.V. Revenko, V.G. Sandukovsky, A. Kovalík, V. Vorobel, Z. Janout, J. Konicek, Stanislav Pospisil, V.E. Kovalenko, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and 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)

Subjects
Physics, Cryostat, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, Monte Carlo method, chemistry.chemical_element, Germanium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, law.invention, Telescope, Nuclear physics, chemistry, law, Beta (plasma physics), 0103 physical sciences, Sensitivity (control systems), 010306 general physics, Hpge detector, Instrumentation
Abstract

A high sensitivity double beta spectrometer TGV (Telescope Germanium Vertical) has been developed. It is based on 16 HPGe detectors of volume 1200 × 6 mm3 each in the same cryostat. The TGV spectrometer was proposed for the study of ultrarare nuclear processes (e.g. 2νββ, 0νββ, 2νEC/EC). Details of the TGV spectrometer construction are described, the principles of background suppression, the results of Monte Carlo simulations and the results of test background measurements (in Dubna and Modane underground laboratory) are provided.

Published
1996

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