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Search Results: 1 - 10 of 87778 matches for " I. Vanyushin "
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Search for $β^+$EC and ECEC processes in $^{112}$Sn and $β^-β^-$ decay of $^{124}$Sn to the excited states of $^{124}$Te
A. S. Barabash,Ph. Hubert,A. Nachab,S. I. Konovalov,I. A. Vanyushin,V. I. Umatov
Physics , 2008, DOI: 10.1016/j.nuclphysa.2008.04.009
Abstract: Limits on $\beta^+$EC and ECEC processes in $^{112}$Sn and on $\beta^-\beta^-$ decay of $^{124}$Sn to the excited states of $^{124}$Te have been obtained using a 380 cm$^3$ HPGe detector and an external source consisting of natural tin. A limit with 90% C.L. on the $^{112}$Sn half-life of $0.92\times 10^{20}$ y for the ECEC(0$\nu$) transition to the $0^+_3$ excited state in $^{112}$Cd (1871.0 keV) has been established. This transition is discussed in the context of a possible enhancement of the decay rate by several orders of magnitude given that the ECEC$(0\nu)$ process is nearly degenerate with an excited state in the daughter nuclide. Prospects for investigating such a process in future experiments are discussed. The $\beta^-\beta^-$ decay limits for $^{124}$Sn to the excited states of $^{124}$Te were obtained on the level of $(0.8-1.2)\times 10^{21}$ y at the 90% C.L.
Possible background reductions in double beta decay experiments
R. Arnold,C. Augier,J. Baker,A. 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. Vala,I. Vanyushin,V. Vasilyev,V. Vorobel,Ts. Vylov
Physics , 2003, DOI: 10.1016/S0168-9002(03)00992-6
Abstract: The background induced by radioactive impurities of $^{208}\rm Tl$ and $^{214}\rm Bi$ 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.
Measurement of the background in the NEMO 3 double beta decay experiment
NEMO Collaboration,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. Lemi`ere,G. Lutter,F. Mamedov,Ch. Marquet,J. Martin-Albo,F. Mauger,A. Nachab,I. Nasteva,I. B. 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. Simard,Yu. A. Shitov,A. A. Smolnikov,S. Snow,S. S"oldner-Rembold,I. Stekl,C. S. Sutton,G. Szklarz,J. Thomas,V. V. Timkin,V. I. Tretyak,Vl. I. Tretyak,V. I. Umatov,L. V'ala,I. A. Vanyushin,V. A. Vasiliev,V. Vorobel,Ts. Vylov
Physics , 2009, DOI: 10.1016/j.nima.2009.04.011
Abstract: In the double beta decay experiment NEMO~3 a precise knowledge of the background in the signal region is of outstanding importance. This article presents the methods used in NEMO~3 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.
Measurement of the two neutrino double beta decay half-life of Zr-96 with the NEMO-3 detector
J. Argyriades,R. Arnold,C. Augier,J. Baker,A. S. Barabash,A. Basharina-Freshville,M. Bongrand,G. Broudin-Bay,V. Brudanin,A. J. Caffrey,A. Chapon,E. Chauveau,Z. Daraktchieva,D. Durand,V. Egorov,N. Fatemi-Ghomi,R. Flack,B. Guillon,Ph. Hubert,S. Jullian,M. Kauer,S. King,A. Klimenko,O. Kochetov,S. I. Konovalov,V. Kovalenko,D. Lalanne,T. Lamhamdi,K. Lang,Y. Lemiere,C. Longuemare,G. Lutter,F. Mamedov,Ch. Marquet,J. Martin-Albo,F. Mauger,A. Nachab,I. Nasteva,I. Nemchenok,C. H. Nguyen,F. Nova,P. Novella,H. Ohsumi,R. B. Pahlka,F. Perrot,F. Piquemal,J. L. Reyss,J. S. Ricol,R. Saakyan,X. Sarazin,Yu. Shitov,L. Simard,F. Simkovic,A. Smolnikov,S. Snow,S. Soldner-Rembold,I. Stekl,J. Suhonen,C. S. Sutton,G. Szklarz,J. Thomas,V. Timkin,V. I. Tretyak,V. Umatov,L. Vala,I. Vanyushin,V. Vasiliev,V. Vorobel,Ts. Vylov
Statistics , 2009, DOI: 10.1016/j.nuclphysa.2010.07.009
Abstract: Using 9.4 g of Zr-96 and 1221 days of data from the NEMO-3 detector corresponding to 0.031 kg yr, the obtained 2vbb decay half-life measurement is [2.35 +/- 0.14(stat) +/- 0.16(syst)] x 10^19 yr. Different characteristics of the final state electrons have been studied, such as the energy sum, individual electron energy, and angular distribution. The 2v nuclear matrix element is extracted using the measured 2vbb half-life and is 0.049 +/- 0.002. Constraints on 0vbb decay have also been set.
Measurement of the Double Beta Decay Half-life of 130Te with the NEMO-3 Detector
R. Arnold,C. Augier,J. Baker,A. S. Barabash,A. Basharina-Freshville,S. Blondel,M. Bongrand,G. Broudin-Bay,V. Brudanin,A. J. Caffrey,A. Chapon,E. Chauveau,D. Durand,V. Egorov,R. Flack,X. Garrido,J. Grozier,B. Guillon,Ph. Hubert,C. M. Jackson,S. Jullian,M. Kauer,A. Klimenko,O. Kochetov,S. I. Konovalov,V. Kovalenko,D. Lalanne,T. Lamhamdi,K. Lang,Z. Liptak,G. Lutter,F. Mamedov,Ch. Marquet,J. Martin-Albo,F. Mauger,J. Mott,A. Nachab,I. Nemchenok,C. H. Nguyen,F. Nova,P. Novella,H. Ohsumi,R. B. Pahlka,F. Perrot,F. Piquemal,J. L. Reyss,B. Richards,J. S. Ricol,R. Saakyan,X. Sarazin,Yu. Shitov,L. Simard,F. ?imkovic,A. Smolnikov,S. S?ldner-Rembold,I. ?tekl,J. Suhonen,C. S. Sutton,G. Szklarz,J. Thomas,V. Timkin,S. Torre,V. I. Tretyak,V. Umatov,L. Vála,I. Vanyushin,V. Vasiliev,V. Vorobel,T. Vylov,A. Zukauskas
Physics , 2011, DOI: 10.1103/PhysRevLett.107.062504
Abstract: This Letter reports results from the NEMO-3 experiment based on an exposure of 1275 days with 661g of 130Te in the form of enriched and natural tellurium foils. The double beta decay rate of 130Te is found to be greater than zero with a significance of 7.7 standard deviations and the half-life is measured to be T1/2 = (7.0 +/- 0.9(stat) +/- 1.1(syst)) x 10^{20} yr. This represents the most precise measurement of this half-life yet published and the first real-time observation of this decay.
Measurement of double beta decay of 100Mo to excited states in the NEMO 3 experiment
R. Arnold,C. Augier,J. Baker,A. S. Barabash,M. Bongrand,G. Broudin,V. Brudanin,A. J. Caffrey,V. Egorov,A. I. Etienvre,N. Fatemi-Ghomi,F. Hubert,Ph. Hubert,J. Jerie,C. Jollet,S. Jullian,S. King,O. Kochetov,S. I. Konovalov,V. Kovalenko,D. Lalanne,T. Lamhamdi,F. Leccia,Y. Lemi`ere,C. Longuemare,G. Lutter,Ch. Marquet,F. Mauger,A. Nachab,H. Ohsumi,F. Perrot,F. Piquemal,J. L. Reyss,J. S. Ricol,R. Saakyan,X. Sarazin,L. Simard,F. Simkovic,Yu. Shitov,A. Smolnikov,S. S"oldner-Rembold,I. Stekl,J. Suhonen,C. S. Sutton,G. Szklarz,J. Thomas,V. Timkin,V. Tretyak,V. Umatov,L. V'ala,I. Vanyushin,V. Vasiliev,V. Vorobel,Ts. Vylov
Statistics , 2006, DOI: 10.1016/j.nuclphysa.2006.09.021
Abstract: The double beta decay of 100Mo to the 0^+_1 and 2^+_1 excited states of 100Ru is studied using the NEMO 3 data. After the analysis of 8024 h of data the half-life for the two-neutrino double beta decay of 100Mo to the excited 0^+_1 state is measured to be T^(2nu)_1/2 = [5.7^{+1.3}_{-0.9}(stat)+/-0.8(syst)]x 10^20 y. The signal-to-background ratio is equal to 3. Information about energy and angular distributions of emitted electrons is also obtained. No evidence for neutrinoless double beta decay to the excited 0^+_1 state has been found. The corresponding half-life limit is T^(0nu)_1/2(0^+ --> 0^+_1) > 8.9 x 10^22 y (at 90% C.L.). The search for the double beta decay to the 2^+_1 excited state has allowed the determination of limits on the half-life for the two neutrino mode T^(2nu)_1/2(0^+ --> 2^+_1) > 1.1 x 10^21 y (at 90% C.L.) and for the neutrinoless mode T^(0nu)_1/2(0^+ --> 2^+_1) > 1.6 x 10^23 y (at 90% C.L.).
Spectral modeling of scintillator for the NEMO-3 and SuperNEMO detectors
J. Argyriades,R. Arnold,C. Augier,J. Baker,A. S. Barabash,M. Bongrand,G. Broudin-Bay,V. B. Brudanin,A. J. Caffrey,S. Cebrián,A. Chapon,E. Chauveau,Th. Dafni,Z. Daraktchieva,J. D iaz,D. Durand,V. G. Egorov,J. J. Evans,N. Fatemi-Ghomi,R. Flack,A. Basharina-Freshville,K-I. Fushimi,X. Garrido,H. Gómez,B. Guillon,A. Holin,K. Holy,J. J. Horkey,Ph. Hubert,C. Hugon,F. J. Iguaz,I. G. Irastorza,N. Ishihara,C. M. Jackson,S. Jullian,S. Kanamaru,M. Kauer,O. I. Kochetov,S. I. Konovalov,V. E. Kovalenko,D. Lalanne,K. Lang,Y. Lemi ere,G. Lutter,G. Luzón,F. Mamedov,Ch. Marquet,J. Martin-Albo,F. Mauger,F. Monrabal,A. Nachab,I. Nasteva,I. B. Nemchenok,C. H. Nguyen,F. Nova,P. Novella,H. Ohsumi,R. B. Pahlka,F. Perrot,F. Piquemal,P. P. Povinec,B. Richards,J. S. Ricol,C. L. Riddle,A. Rodriguez,R. Saakyan,X. Sarazin,J. K. Sedgbeer,L. Serra,L. Simard,F. ?imkovic,Yu. A. Shitov,A. A. Smolnikov,S. Soldner-Rembold,I. ?tekl,Y. Sugaya,C. S. Sutton,G. Szklarz,Y. Tamagawa,J. Thomas,R. Thompson,V. V. Timkin,V. I. Tretyak,Vl. I. Tretyak,V. I. Umatov,L. V ala,I. A. Vanyushin,R. Vasiliev,V. Vorobel,Ts. Vylov,D. Waters,N. Yahlali,A. ?ukauskas
Physics , 2010, DOI: 10.1016/j.nima.2010.09.027
Abstract: We have constructed a GEANT4-based detailed software model of photon transport in plastic scintillator blocks and have used it to study the NEMO-3 and SuperNEMO calorimeters employed in experiments designed to search for neutrinoless double beta decay. We compare our simulations to measurements using conversion electrons from a calibration source of $\rm ^{207}Bi$ and show that the agreement is improved if wavelength-dependent properties of the calorimeter are taken into account. In this article, we briefly describe our modeling approach and results of our studies.
Results of the BiPo-1 prototype for radiopurity measurements for the SuperNEMO double beta decay source foils
J. Argyriades,R. Arnold,C. Augier,J. Baker,A. S. Barabash,A. Basharina-Freshville,M. Bongrand,C. Bourgeois,D. Breton,M. Briére,G. Broudin-Bay,V. B. Brudanin,A. J. Caffrey,S. Cebrián,A. Chapon,E. Chauveau,Th. Dafni,J. Díaz,D. Durand,V. G. Egorov,J. J. Evans,R. Flack,K-I. Fushima,I. G. Irastorza,X. Garrido,H. Gómez,B. Guillon,A. Holin,K Holy,J. J. Horkey,P. Hubert,C. Hugon,F. J. Iguaz,N. Ishihara,C. M. Jackson,S. Jenzer,S. Jullian,M. Kauer,O. I. Kochetov,S. I. Konovalov,V. Kovalenko,T. Lamhamdi,K. Lang,Y. Lemiére,G. Lutter,G. Luzón,F. Mamedov,Ch. Marquet,F. Mauger,F. Monrabal,A. Nachab,I. B. Nemchenok,C. H. Nguyen,M. Nomachi,F. Nova,H. Ohsumi,R. B. Pahlka,F. Perrot,F. Piquemal,P. P. Povinec,B. Richards,J. S. Ricol,C. L. Riddle,A. Rodríguez,R. Saakyan,X. Sarazin,J. K. Sedgbeer,L. Serra,Yu. A. Shitov,L. Simard,F. ?imkovic,S. S?ldner-Rembold,I. ?tekl,C. S. Sutton,Y. Tamagawa,G. Szklarz,J. Thomas,V. Timkin,V. Tretyak,Vl. I. Tretyak,V. I. Umatov,L. Vála,I. A. Vanyushin,R. Vasiliev,V. A. Vasiliev,V. Vorobel,D. Waters,N. Yahali,A. ?ukauskas
Physics , 2010, DOI: 10.1016/j.nima.2010.07.037
Abstract: The development of BiPo detectors is dedicated to the measurement of extremely high radiopurity in $^{208}$Tl and $^{214}$Bi for the SuperNEMO double beta decay source foils. A modular prototype, called BiPo-1, with 0.8 $m^2$ of sensitive surface area, has been running in the Modane Underground Laboratory since February, 2008. The goal of BiPo-1 is to measure the different components of the background and in particular the surface radiopurity of the plastic scintillators that make up the detector. The first phase of data collection has been dedicated to the measurement of the radiopurity in $^{208}$Tl. After more than one year of background measurement, a surface activity of the scintillators of $\mathcal{A}$($^{208}$Tl) $=$ 1.5 $\mu$Bq/m$^2$ is reported here. Given this level of background, a larger BiPo detector having 12 m$^2$ of active surface area, is able to qualify the radiopurity of the SuperNEMO selenium double beta decay foils with the required sensitivity of $\mathcal{A}$($^{208}$Tl) $<$ 2 $\mu$Bq/kg (90% C.L.) with a six month measurement.
Probing New Physics Models of Neutrinoless Double Beta Decay with SuperNEMO
R. Arnold,C. Augier,J. Baker,A. S. Barabash,A. Basharina-Freshville,M. Bongrand,V. Brudanin,A. J. Caffrey,S. Cebrián,A. Chapon,E. Chauveau,Th. Dafni,F. F. Deppisch,J. Diaz,D. Durand,V. Egorov,J. J. Evans,R. Flack,K-I. Fushima,I. García Irastorza,X. Garrido,H. Gómez,B. Guillon,A. Holin,K. Holy,J. J. Horkley,Ph. Hubert,C. Hugon,F. J. Iguaz,N. Ishihara,C. M. Jackson,S. Jullian,M. Kauer,O. Kochetov,S. I. Konovalov,V. Kovalenko,T. Lamhamdi,K. Lang,G. Lutter,G. Luzón,F. Mamedov,Ch. Marquet,F. Mauger,F. Monrabal,A. Nachab,I. Nasteva,I. Nemchenok,C. H. Nguyen,M. Nomachi,F. Nova,H. Ohsumi,R. B. Pahlka,F. Perrot,F. Piquemal,P. P. Povinec,B. Richards,J. S. Ricol,C. L. Riddle,A. Rodríguez,R. Saakyan,X. Sarazin,J. K. Sedgbeer,L. Serra,Yu. Shitov,L. Simard,F. ?imkovic,S. S?ldner-Rembold,I. ?tekl,C. S. Sutton,Y. Tamagawa,J. Thomas,V. Timkin,V. Tretyak,Vl. I. Tretyak,V. I. Umatov,I. A. Vanyushin,R. Vasiliev,V. Vasiliev,V. Vorobel,D. Waters,N. Yahlali,A. ?ukauskas
Physics , 2010, DOI: 10.1140/epjc/s10052-010-1481-5
Abstract: The possibility to probe new physics scenarios of light Majorana neutrino exchange and right-handed currents at the planned next generation neutrinoless double beta decay experiment SuperNEMO is discussed. Its ability to study different isotopes and track the outgoing electrons provides the means to discriminate different underlying mechanisms for the neutrinoless double beta decay by measuring the decay half-life and the electron angular and energy distributions.
Depth Requirements for a Tonne-scale 76Ge Neutrinoless Double-beta Decay Experiment
The MAJORANA Collaboration,E. Aguayo,F. T. Avignone III,H. O. Back,A. S. Barabash,M. Bergevin,F. E. Bertrand,M. Boswell,V. Brudanin,M. Busch,Y-D. Chan,C. D. Christofferson,J. I. Collar,D. C. Combs,R. J. Cooper,J. A. Detwiler,P. J. Doe,Yu. Efremenko,V. Egorov,H. Ejiri,S. R. Elliott,J. Esterline,J. E. Fast,N. Fields,P. Finnerty,F. M. Fraenkle,V. M. Gehman,G. K. Giovanetti,M. P. Green,V. E. Guiseppe,K. Gusey,A. L. Hallin,R. Hazama,R. Henning,A. Hime,E. W. Hoppe,M. Horton,S. Howard,M. A. Howe,R. A. Johnson,K. J. Keeter,M. E. Keillor,C. Keller,J. D. Kephart,M. F. Kidd,A. Knecht,O. Kochetov,S. I. Konovalov,R. T. Kouzes,B. D. LaFerriere,B. H. LaRoque,J. Leon,L. E. Leviner,J. C. Loach,S. MacMullin,M. G. Marino,R. D. Martin,D. -M. Mei,J. H. Merriman,M. L. Miller,L. Mizouni,M. Nomachi,J. L. Orrell,N. R. Overman,D. G. Phillips II,A. W. P. Poon,G. Perumpilly,G. Prior,D. C. Radford,K. Rielage,R. G. H. Robertson,M. C. Ronquest,A. G. Schubert,T. Shima,M. Shirchenko,K. J. Snavely,V. Sobolev,D. Steele,J. Strain,K. Thomas,V. Timkin,W. Tornow,I. Vanyushin,R. L. Varner,K. Vetter,K. Vorren,J. F. Wilkerson,B. A. Wolfe,E. Yakushev,A. R. Young,C. -H. Yu,V. Yumatov,C. Zhang
Physics , 2011,
Abstract: Neutrinoless double-beta decay experiments can potentially determine the Majorana or Dirac nature of the neutrino, and aid in understanding the neutrino absolute mass scale and hierarchy. Future 76Ge-based searches target a half-life sensitivity of >10^27 y to explore the inverted neutrino mass hierarchy. Reaching this sensitivity will require a background rate of <1 count tonne^-1 y^-1 in a 4-keV-wide spectral region of interest surrounding the Q value of the decay. We investigate the overburden required to reach this background goal in a tonne-scale experiment with a compact (copper and lead) shield based on Monte Carlo calculations of cosmic-ray background rates. We find that, in light of the presently large uncertainties in these types of calculations, a site with an underground depth >~5200 mwe is required for a tonne-scale experiment with a compact shield similar to the planned 40-kg MAJORANA DEMONSTRATOR. The required overburden is highly dependent on the chosen shielding configuration and could be relaxed significantly if, for example, a liquid cryogen and water shield, or an active neutron shield were employed. Operation of the MAJORANA DEMONSTRATOR and GERDA detectors will serve to reduce the uncertainties on cosmic-ray background rates and will impact the choice of shielding style and location for a future tonne-scale experiment. 4/2013: The peer review process revealed that one of the veto rejection factors (the factor-of-4 described on p12) needs to be better established. Our reevaluation of this parameter to date has not yielded strong support for the value stated in the manuscript, and we require further study to develop a solid estimate. This further study will supersede the work described in this manuscript, and may or may not lead to the same conclusion regarding the ~>5200 mwe requirement for future tonne-scale 76Ge neutrinoless double beta decay experiments.
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