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Accueil du site > ANGLAIS > Research > NEMO - Neutrino & Feeble Radioactivity Measurements > Publications > The 2000’s


The 2000’s

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2009

Radioactivity measurements applied to the dating and authentication of old wines

Ph. Hubert, F. Perrot, J. Gaye, B. Médina, M.S. Pravikoff

Comptes Rendus Physique, Volume 10, Issue 7, Pages 622-629 (2009)

For many years the neutrino group in the CENBG has been involved in the development of low background γ-ray spectrometers, based on the use of HPGe crystals. When applied to radioactivity measurements of wine in bottles, it has been shown that besides the well-known isotope 40K, the wine contains also trace amounts of 137Cs (less than 1 Bq/l) with an activity depending on the vintage. This technique has thus led to the possibility to date the wine bottles of vintages between 1952 and ∼1980 and to verify the year written on the label or on the cork. Since the measurements do not require opening the bottle, the technique has also proved to be very useful for detecting counterfeit wines of the XIXth century and first half of the XXth century.

Measurement of the double-β decay half-life of 150Nd and search for neutrinoless decay modes with the NEMO-3 detector

J. Argyriades, R. Arnold, C. Augier, J. Baker, A.S. Barabash, A. Basharina-Freshville, M. Bongrand, G. Broudin, V. Brudanin, A.J. Caffrey, E. Chauveau, Z. Daraktchieva, D. Durand, V. A. Egorov, N. Fatemi-Ghomi, R. Flack, Ph. Hubert, J. Jerie, S. Jullian1, M. Kauer, S. King, A. Klimenko, O. Kochetov, S.I. Konovalov, V. V. Kovalenko, D. Lalanne, T. Lamhamdi, K. Lang, Y. Lemière, C. Longuemare, G. Lutter, Ch. Marquet, J. Martin-albo, F. Mauger, A. Nachab, I. Nasteva, I. Nemchenok, F. Nova, P. Novella, H. Ohsumi, R.B. Pahlka, F. Perrot, F. Piquemal, J.L. Reyss, J.S. Ricol, R. Saakyan, X. Sarazin, L. Simard1, F. Simkovic, Yu. Shitov, A. Smolnikov, S. Snow, S. Soldner-Rembold, I. Stekl, J. Suhonen, C.S. Sutton, G. Szklarz, J. Thomas, V. Timkin, V. Tretyak, V. Umatov, L. Vala, I. Vanyushin, V. Vasiliev, V. Vorobel, Ts. Vylov

NEMO Collaboration(s)

Physical Review C 80 (2009) 032501

The half-life for double-β decay of 150Nd has been measured by the NEMO-3 experiment at the Modane Underground Laboratory. Using 924.7 days of data recorded with 36.55 g of 150Nd, we measured the half-life for 2νββ decay to be T 2ν 1/2 = (9.11+0.25 −0.22(stat.) ± 0.63(syst.)) × 1018 yr. The observed limit on the half-life for neutrinoless double-β decay is found to be T 0ν 1/2 > 1.8 × 1022 yr at 90% confidence level. This translates into a limit on the effective Majorana neutrino mass of (mν ) < 4.0-6.3 eV if the nuclear deformation is taken into account. We also set limits on models involving Majoron emission, right-handed currents, and transitions to excited states.

Measurement of the background in the NEMO 3 double beta decay experiment

J. Argyriades, R. Arnold, C. Augier, J. Baker, A. S. Barabash, M. Bongrand, G. Broudin-Bay, V. B. Brudanin, A. J. Caffrey, A. Chapon, E. Chauveau, Z. Daraktchieva, D. Durand, V. G. Egorov, N. Fatemi-Ghomi, R. Flack, A. Freshville, B. Guillon, Ph. Hubert, S. Jullian, M. Kauer, S. King, O. I. Kochetov, S. I. Konovalov, V. E. Kovalenko, D. Lalanne, K. Lang, Y. Lemière, G. Lutter, F. Mamedov, Ch. Marquet, J. Martin-Albo, F. Mauger, A. Nachab, I. Nasteva, I. B. Nemchenok, C. H. Nguyen, F. Novam, P. Novella, H. Ohsumi, R. B. Pahlka, F. Perrot, F. Piquemal, J. L. Reyss, J. S. Ricol, R. Saakyan, X. Sarazin, L. Simard, Yu. A. Shitov, A. A. Smolnikov, S. Snow, S. Söldner-Rembold, I. Setekl, C. S. Sutton, G. Szklarz, J. Thomas, V. V. Timkin, V. I. Tretyak-, Vl. I. Tretyak, V. I. Umatov, L. Vala, I. A. Vanyushin, V. A. Vasiliev, V. Vorobel, Ts. Vylov

NEMO Collaboration(s)

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Volume 606, Issue 3, 21 July 2009, Pages 449–465

In the double beta decay experiment NEMO3 a precise knowledge of the background in the signal region is of outstanding importance. This article presents the methods used in NEMO3 to evaluate the backgrounds resulting from most if not all possible origins. It also illustrates the power of the combined tracking-calorimetry technique used in the experiment.

Investigation of beta beta decay in 150Nd and 148Nd to the excited states of daughter nuclei

A. S. Barabash, Ph. Hubert, A. Nachab, V. I. Umatov

Physical Review C 79 (2009) 045501

Double beta decay of 150Nd and 148Nd to the excited states of daughter nuclei have been studied using a 400 cm3 low-background HPGe detector and an external source consisting of 3046 g of natural Nd_2O3 powder. The half-life for the two-neutrino double beta decay of 150Nd to the excited 0+1 state in 150Sm is measured to be T1/2=1.33+0.36-0.23(stat)+0.27_-0.13(syst)] 10.20 y. For other (0v + 2v) transitions to the 2^+_1, ^+_2, 2^+_3, and 0^+_2 levels in 150Sm, limits are obtained at the level of $\sim (2-8)\cdot 1020 y. In the case of 148Nd only limits for the (0\nu + 2\nu) transitions to the 2^+_1, 0^+_1, and 2^+2 excited states in 148Sm were obtained and are at the level of \sim (4-8)\cdot 1020 y.

Modeling of 137Cs migration in soils using an 80-year soil archive: role of fertilizers and agricultural amendment

F. Monna, F. van Oort, Ph. Hubert, J. Dominik, J. Bolte, J.-L. Loizeau, J. Labanowski, J. Lamri, C. Petit, G. Le Roux, C. Chateau

Journal of Environmental Radioactivity

Volume 100, Issue 1, January 2009, Pages 9–16

An 80-year soil archive, the 42-plot experimental design at the INRA in Versailles (France), is used here to study long-term contamination by 137Cs atmospheric deposition and the fate of this radioisotope when associated with various agricultural practices: fallow land, KCl, NH4(NO3), superphosphate fertilizers, horse manure and lime amendments. The pertinence of a simple box model, where radiocaesium is supposed to move downward by convectional mechanisms, is checked using samples from control plots which had been neither amended, nor cultivated since 1928. This simple model presents the advantage of depending on only two parameters: a, a proportional factor allowing the historical atmospheric 137Cs fluxes to be reconstructed locally, and k, an annual loss coefficient from the plow horizon. Another pseudo-unknown is however necessary to run the model: the shape of historical 137Cs deposition, but this function can be easily computed by merging several curves previously established by other surveys. A loss of 1.5% per year from the plow horizon, combined with appropriate fluxes, provides good concordance between simulated and measured values. In the 0–25 cm horizon, the residence half time is found to be 18 yr (including both migration and radioactive decay). Migration rate constants are also calculated for some plots receiving continuous long-term agricultural treatments. Comparison with the control plots reveals significant influence of amendments on 137Cs mobility in these soils developed from a unique genoform.


2006

Limits on different majoron decay modes of 100Mo and 82Se for neutrinoless double beta decays in the NEMO-3 experiment

R. Arnold, C. Augier, J. Baker, A.S. Barabash, V. Brudanin, A.J. Caffrey, E. Caurier, V. Egorov, K. Errahmane, A.I. Etienvre, J.L. Guyonnet, F. Hubert, Ph. Hubert, C. Jollet, S. Jullian, S. King, O. Kochetov, S. Konovalov, V. Kovalenko, D. Lalanne, F. Leccia, C. Longuemare, G. Lutter, Ch. Marquet, F. Mauger, F. Nowacki, H. Ohsumi, F. Piquemal, J.-L. Reyss, R. Saakyan, X. Sarazin, Yu. Shitov, L. Simard, F. Simkovic, A. Smolnikov, I. Stekl, J. Suhonen, C.S. Sutton, G. Szklarz, V. Timkin, J. Thomas, V. Tretyak, V. Umatov, L. Vala, I. Vanyushin, V. Vasilyev, V. Vorobel, Ts. Vylov

NEMO Collaboration

Nucl. Phys. A 765 (2006) 483-494

The NEMO-3 tracking detector is located in the Fréjus Underground Laboratory. It was designed to study double beta decay in a number of different isotopes. Presented here are the experimental half-life limits on the double beta decay process for the isotopes 100Mo and 82Se for different majoron emission modes and limits on the effective neutrino–majoron coupling constants. In particular, new limits on “ordinary” majoron (spectral index 1) decay of 100Mo (T1/2 > 2.7 × 1022 yr) and 82Se (T1/2 > 1.5 × 1022 yr) have been obtained. Corresponding bounds on the majoron–neutrino coupling constant are -gee- < (0.4–1.8) ×10−4 and < (0.66–1.9)×10−4.

______________________________________________

2005

Measurement of Neutrino Oscillation with KamLAND: Evidence of Spectral Distortion

The KamLAND Collaboration

T. Araki, K. Eguchi, S. Enomoto, K. Furuno, K. Ichimura, H. Ikeda, K. Inoue, K. Ishihara,- T. Iwamoto, T. Kawashima, Y. Kishimoto, M. Koga, Y. Koseki, T. Maeda, T. Mitsui, M. Motoki, K. Nakajima, H. Ogawa, K. Owada, J.-S. Ricol, I. Shimizu, J. Shirai, F. Suekane, A. Suzuki, K. Tada, O. Tajima, K. Tamae, Y. Tsuda, H. Watanabe, J. Busenitz, T. Classen, Z. Djurcic, G. Keefer, K. McKinny, D.-M. Mei, A. Piepke, E. Yakushev, B.E. Berger, Y.D. Chan, M.P. Decowski, D.A. Dwyer, S.J. Freedman, Y. Fu, B.K. Fujikawa, J. Goldman, F. Gray, K.M. Heeger, K.T. Lesko, K.-B. Luk, H. Murayama, A.W.P. Poon, H.M. Steiner, L.A. Winslow, G.A. Horton-Smith, C. Mauger, R.D. McKeown, P. Vogel, C.E. Lane, T. Miletic,5 .W. Gorham, G. Guillian, J.G. Learned, J. Maricic, S. Matsuno, S. Pakvasa, S. Dazeley, S. Hatakeyama, A. Rojas, R. Svoboda, B.D. Dieterle, J. Detwiler, G. Gratta, K. Ishii, N. Tolich, Y. Uchida, — M. Batygov, W. Bugg, Y. Efremenko, Y. Kamyshkov, A. Kozlov, Y. Nakamura, C.R. Gould, H.J. Karwowski, D.M. Markoff, J.A. Messimore, K. Nakamura, R.M. Rohm, W. Tornow, R. Wendell, A.R. Young, M.-J. Chen, Y.-F. Wang, and F. Piquemal

Phys. Rev. Lett. 94 (2005) 081801

We present results of a study of neutrino oscillation based on a 766 ton/year exposure of KamLAND to reactor antineutrinos. We observe 258 ν¯e candidate events with energies above 3.4 MeV compared to 365.2±23.7 events expected in the absence of neutrino oscillation. Accounting for 17.8±7.3 expected background events, the statistical significance for reactor ν¯e disappearance is 99.998%. The observed energy spectrum disagrees with the expected spectral shape in the absence of neutrino oscillation at 99.6% significance and prefers the distortion expected from ν¯e oscillation effects. A two-neutrino oscillation analysis of the KamLAND data gives Δm2=7.9+0.6−0.5×10−5  eV2. A global analysis of data from KamLAND and solar-neutrino experiments yields Δm2=7.9+0.6−0.5×10−5  eV2 and tan2θ=0.40+0.10−0.07, the most precise determination to date.

First results of the search for neutrinoless double beta decay with the NEMO 3 detector

R. Arnold, C. Augier, J. Baker, A. Barabasf , G. Broudin, V. Brudanin, A.J. Caffrey, E. Caurier, V. Egorov, K. Errahmane, A.I. Etienvre, J.L. Guyonnet, F. Hubert, Ph. Hubert, C. Jollet, S. Jullian, O. Kochetov, V. Kovalenko, S. Konovalov , D. Lalanne, F. Leccia, C. Longuemare, G. Lutter, Ch. Marquet, F. Mauger, F. Nowacki, H. Ohsumi, F. Piquemal, J.L. Reyss, R. Saakyan, X. Sarazin, L. Simard, F. Simkovic, Yu. Shitov, A. Smolnikov, I. Stekl, J. Suhonen, C.S. Sutton, G. Szklarz, J. Thomas, V. Timkin, V. Tretyak, V. Umatov , L. Vala, I. Vanushin , V. Vasilyev, V. Vorobel and Ts. Vylov

Phys. Rev. Lett. 95 (2005) 182302

The NEMO 3 detector, which has been operating in the Frejus underground laboratory since February 2003, is devoted to the search for neutrinoless double beta decay (ββ0ν). Half-lives of the two neutrino double beta decays (ββ2ν) have been measured for 100Mo and 82Se. After 389 effective days of data collection from February 2003 until September 2004 (Phase I), no evidence for neutrinoless double beta decay was found from 7 kg of 100Mo and 1 kg of 82Se. The corresponding lower limits for the half-lives are 4.6 x 1023 years for 100Mo and 1.0 x1023 years for 82Se (90 % C.L.). Depending on the nuclear matrix elements calculation, limits for the effective Majorana neutrino mass are mν < 0.7-2.8 eV for 100Mo and mν < 1.7-4.9 eV for 82Se

Technical design and performance of the NEMO 3 detector

R. Arnold, C. Augier-, A.M. Bakalyarov, J. Baker, A. Barabash, Ph. Bernaudin, M. Bouchel, V. Brudanin, A.J. Caffrey, J. Cailleret, J.E. Campagne, D. Dassé, V. Egorov, K. Errahmane, A.I. Etienvre, T. Filipova, J. Forget, A. Guiral, P. Guiral, J.L. Guyonnet, F. Hubert, Ph. Hubert, B. Humbert, R. Igersheim, P. Imbert, C. Jollet, S. Jullian, I. Kisel, A. Klimenko, O. Kochetov, V. Kovalenko, D. Lalanne, F. Laplanche, B. Lavigne, V.I. Lebedev, J. Lebris, F. Leccia, A. Leconte, I. Linck, C. Longuemare, Ch. Marquet, G. Martin-Chassard, F. Mauger, I. Nemchenok, I. Nikolic-Audit, H. Ohsumi, S. Pécourt, F. Piquemal, J.L. Reyss, A. Richard, C.L. Riddle, J. Rypko, X. Sarazin, L. Simard, F. Scheibling, Yu. Shitov, A. Smolnikov, I. Sötekl, C.S. Sutton, G. Szklarz, V. Timkin, V. Tretyak, V. Umatov, L. Valab, I. Vanushin, S. Vasiliev, V. Vasilyev, V. Vorobel, Ts. Vylov, J. Wurtz, S.V. Zhukov

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 536, Issues 1–2, 1 January 2005, Pages 79-122

The development of the Neutrino Ettore Majorana Observatory (NEMO 3) detector, which is now running in the Fréjus Underground Laboratory (L.S.M. Laboratoire Souterrain de Modane), was begun more than ten years ago. The NEMO 3 detector uses a tracking-calorimeter technique in order to investigate double beta decay processes for several isotopes. The technical description of the detector is followed by the presentation of its performance.

Experimental investigation of geologically produced antineutrinos with KamLAND

T. Araki, S. Enomoto, K. Furuno, Y. Gando, K. Ichimura, H. Ikeda, K. Inoue, Y. Kishimoto, M. Koga, Y. Koseki, T. Maeda, T. Mitsui, M. Motoki, K. Nakajima, H. Ogawa, M. Ogawa, K. Owada, J.-S. Ricol, I. Shimizu, J. Shirai, F. Suekane, A. Suzuki, K. Tada, S. Takeuchi, K. Tamae, Y. Tsuda, H. Watanabe, J. Busenitz, T. Classen, Z. Djurcic, G. Keefer, D. Leonard, A. Piepke, E. Yakushev, B.E. Berger, Y.D. Chan, M.P. Decowski, D.A. Dwyer, S.J. Freedman, B.K. Fujikawa, J. Goldman, F. Gray, K.M. Heeger, L. Hsu, K.T. Lesko, K.-B. Luk, H. Murayama, T. O’Donnell, A.W.P. Poon, H.M. Steiner, L.A. Winslow, C. Mauger, R.D. McKeown, P. Vogel, C.E. Lane, T. Miletic, G. Guillian, J.G. Learned, J. Maricic, S. Matsuno, S. Pakvasa, G.A. Horton-Smith, S. Dazeley, S. Hatakeyama, A. Rojas, R. Svoboda, B.D. Dieterle, J. Detwiler, G. Gratta, K. Ishii, N. Tolich, Y. Uchida, M. Batygov, W. Bugg, Y. Efremenko, Y. Kamyshkov, A. Kozlov, Y. Nakamura, H.J. Karwowski, D.M. Markoff, K. Nakamura, R.M. Rohm, W. Tornow, R. Wendell, M.-J. Chen, Y.F. Wang, F. Piquemal

Nature 436, 499-503 (28 July 2005)

The detection of electron antineutrinos produced by natural radioactivity in the Earth could yield important geophysical information. The Kamioka liquid scintillator antineutrino detector (KamLAND) has the sensitivity to detect electron antineutrinos produced by the decay of 238U and 232Th within the Earth. Earth composition models suggest that the radiogenic power from these isotope decays is 16 TW, approximately half of the total measured heat dissipation rate from the Earth. Here we present results from a search for geoneutrinos with KamLAND. Assuming a Th/U mass concentration ratio of 3.9, the 90 per cent confidence interval for the total number of geoneutrinos detected is 4.5 to 54.2. This result is consistent with the central value of 19 predicted by geophysical models. Although our present data have limited statistical power, they nevertheless provide by direct means an upper limit (60 TW) for the radiogenic power of U and Th in the Earth, a quantity that is currently poorly constrained.


2004

Double-beta decay of 150Nd to the first 0+ excited state of 150 Sm: Current state

A. S. Barabash, F. Hubert, Ph. Hubert, V. I. Umatov

Physics of Atomic Nuclei, March 2004, Volume 67, Issue 3, pp 453-456

Two-neutrino double-beta decay of 150Nd to the first 0+ excited state in 150Sm is investigated with the 400 cm3 low-background HPGe detector. Preliminary data analysis for 6843 h shows an excess of events at 333.9 and 406.5 keV. If this excess is assigned to the investigated transition, then its half-life can be estimated at [1.2−0.3+0.5 ±0.4(syst.)]×1020 yr.


2003

Possible background reductions in double beta decay experiments

R. Arnold, C. Augier, J. Baker, A.S. Barabash, O. Bing, V. Brudanin, A.J. Caffrey, E. Caurier, K. Errahmane, A.-I. Etienvre, J.L. Guyonnet, F. Hubert, Ph. Hubert, C. Jollet, S. Jullian, O. Kochetov, V. Kovalenko, D. Lalanne, F. Leccia, C. Longuemare, Ch. Marquet, F. Mauger, H.W. Nicholson, H. Ohsumi, F. Piquemal, J.-L. Reyss, X. Sarazin, Yu. Shitov, L. Simard, I. Stekl, J. Suhonen, C.S. Sutton, G. Szklarz, V. Timkin, V. Tretyak, V. Umatov, L. V!ala, I. Vanyushi

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 503, Issue 3, 11 May 2003, Pages 649-657

The background induced by radioactive impurities of 208Tl and 214Bi in the source of the double beta experiment NEMO-3 has been investigated. New methods of data analysis which decrease the background from the above mentioned contamination are identified. The techniques can also be applied to other double beta decay experiments capable of measuring independently the energies of the two electrons.


2002

Gamma-ray flux in the Fréjus underground laboratory measured with NaI detector

NEMO Collaboration

H. Ohsumi, R. Gurriaran, Ph. Hubert, R. Arnold, C. Augier, J. Baker, A. Barabash, O. Bing, V. Brudanin, A.J. Caffrey, J.E. Campagne, E. Caurier, D. Dassié, V. Egorov, K. Errahmane, R. Eschbach, T. Filipova, J.L. Guyonnet, F. Hubert, C. Jollet, S. Jullian, I. Kisel, A. Klimenko, O. Kochetov, V.N. Kornoukhov, V. Kovalenko, V. Kuzichev, D. Lalanne, F. Laplanche, F. Leccia, I. Linck, C. Longuemare, Ch. Marquet, F. Mauger, H.W. Nicholson, I. Nikolic-Audit, F. Piquemal, J.L. Reyss, X. Sarazin, A. Smolnikov, I. Stekl, J. Suhonen, C.S. Sutton, G. Szklarz, V. Timkin, V. Tretyak, V. Umatov, L. Vala, I. Vanyushin, A. Vareille, V. Vasiliev, S. Vasiliev, V. Vorobel, Ts. Vylof

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 482, Issue 3, 21 April 2002, Pages 832-839

The γ-ray flux in the Fréjus underground laboratory has been studied using an NaI detector surrounded by different diagonostic shields. Below 4 MeV, the spectrum is dominated by radioactivities in the surrounding materials and rocks. Between 4 and 6 MeV, the shape of the spectrum is well explained by U, Th and daughters, which are internal contaminations in the NaI crystal. Between 6 and 10 MeV, the γ-ray flux is strongly correlated with neutron captures in the surrounding materials. Finally, the γ-ray flux above 10 MeV falls off and is related to the very weak cosmic muon flux via muon Bremsstrahlung.


2001

Chemical purification of molybdenum samples for the NEMO 3 experiment

R. Arnold, C. Augier, J. Baker, A. Barabash, O. Bing, D. Blum, V. Brudanin, A.J. Caffrey, J.E. Campagne, E. Caurier, D. Dassié, V. Egorov, K. Errahmane, T. Filipova, J.L. Guyonnet, F. Hubert, Ph. Hubert, S. Jullian, O. Kochetov, I. Kisel, V.N. Kornoukhov, V. Kovalenko, V.F. Kuzichev, D. Lalanne, F. Laplanche, F. Leccia, I. Linck, C. Longuemare, Ch. Marquet, F. Mauger, H.W. Nicholson, I. Nikolic-Audit, I. Pilugin, F. Piquemal, J-L. Reyss, C.L. Riddle, X. Sarazin, F. Scheibling, I. Stekl, J. Suhonen, C.S. Sutton, G. Szklarz, V. Timkin, V. Tretyak, V. Umatov, I. Vanyushin, V. Vorobel, Ts. Vylov

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 474, Issue 1, 21 November 2001, Pages 93-100

Most currently, viable double beta decay experiments require highly enriched isotopic sources. These sources must be extraordinarily free of radioactive contamination. The double beta decay experiment NEMO 3 will study 100Mo, for which physical and chemical purification techniques have been investigated. The success of the chemical purification process is discussed in the context of ultra-low background, high-purity germanium spectrometer measurements.

Influence of neutrons and gamma-rays in the Fréjus underground laboratory on the NEMO experiment

NEMO collaboration

Ch. Marquet, F. Piquemal, R. Arnold, C. Augier, J. Baker, A. Barabash, O. Bing, D. Blum, V. Brudanin, J. Ca!rey, J.E. Campagne, E. Caurier, D. Dassié, V. Egorov, K. Errahmane, R. Eschbach, T. Filipova, J.L. Guyonnet, C. Jollet, S. Jullian, F. Hubert, Ph. Hubert, I. Kisel, O. Kochetov, V.N. Kornoukhov, V. Kovalenko, D. Lalanne, F. Laplanche, F. Leccia, I. Linck, C. Longuemare, F. Mauger, H.W. Nicholson, I. Nikolic-Audit, H. Ohsumi, I. Pilugin, J.L. Reyss, X. Sarazin, F. Scheibling, I. Stekl, J. Suhonen, C.S. Sutton, G. Szklarz, V. Timkin, V. Tretyak, V. Umatov, L. Vala, I. Vanyushin, A. Vareille, V. Vorobel, Ts. Vylov

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Volume 457, Issue 3, 21 January 2001, Pages 487–498

To be sensitive to an effective Majorana neutrino mass, 〈mν〉, on the order of 0.1 eV, the NEMO 3 double beta (ββ(0ν)) decay experiment requires precise knowledge and control of the backgrounds. The effect of neutrons and γ-rays from the Fréjus underground laboratory (LSM, Laboratoire Souterrain de Modane) has been studied during 10 700 h of data collection. The data were taken with a NEMO 2 prototype detector using different shield configurations. Monte Carlo calculations with GEANT/MICAP code and a new library of γ-rays from neutron captures are presented. The implied consequences for the NEMO 3 detector which is under construction are discussed. The neutrinoless double beta decay background induced by neutrons and γ-rays within the LSM will be suppressed to the very suitable level of 0.1 event in a live time of five years given the appropriate shield and magnetic field.


2000

Testing the Pauli exclusion principle with the NEMO-2 detector

NEMO Collaboration

presented by Barabash A.S.

Nuclear Physics B - Proceedings Supplements

Volume 87, Issues 1–3, June 2000, Pages 510–511

Proceedings of the Sixth International Workshop on Topics in Astroparticle and Underground Physics

Limits on different Majoron decay modes of 100Mo, 116Cd, 82Se and 96Zr for neutrinoless double beta decays in the NEMO-2 experiment

NEMO collaboration

R. Arnold, C. Augier, J. Baker, A. Barabash, D. Blum, V. Brudanin, A.J. Caffrey, J.E. Campagne, E. Caurier, D. Dassié, V. Egorov, T. Filipova, R. Gurriaran, J.L. Guyonnet, F. Hubert, Ph. Hubert, S. Jullian, I. Kisel, O. Kochetov, V.N. Kornoukhov, V. Kovalenko, D. Lalanne, F. Laplanche, F. Leccia, I. Linck, C. Longuemare, Ch. Marquet, F. Mauger, H.W. Nicholson, I. Pilugin, F. Piquemal, J-L. Reyss, X. Sarazin, F. Scheibling, J. Suhonen, C.S. Sutton, G. Szklarz, V. Timkin, R. Torres, V. Umatov, I. Vanyushin, A. Vareille, V. Vasilyev, Ts. Vylov

Nuclear Physics A

Volume 678, Issue 3, 9 October 2000, Pages 341–352

The NEMO-2 tracking detector located in the Fréjus Underground Laboratory was designed as a prototype for the NEMO-3 detector and to study different modes of double beta decay. Measurements with 100Mo, 116Cd, 82Se and 96Zr were carried out. Presented here are the experimental half-life limits on double beta decays for new Majoron emission modes and limits on effective neutrino–Majoron coupling constants.