-
R. Arnold,
C. Augier,
J. Baker,
A. S. Barabash, A. Basharina-Freshville,
M. Bongrand,
V. Brudanin,
A. J. Caffrey,
S. Cebrián,
A. Chapon, [......],
V. Tretyak,
V. I. Tretyak,
V. I. Umatov,
I. A. Vanyushin,
R. Vasiliev,
V. Vasiliev,
V. Vorobel,
D. Waters,
N. Yahlali,
A. Žukauskas
[show abstract]
[hide abstract]
ABSTRACT: The possibility to probe new physics scenarios of light Majorana neutrino exchange and right-handed currents at the planned
next generation neutrinoless double β 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 β decay by measuring the decay half-life and the electron angular and energy distributions.
European Physical Journal C 04/2012; 70(4):927-943. · 3.63 Impact Factor
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R Arnold,
C Augier,
J Baker,
A S Barabash, A Basharina-Freshville,
S Blondel,
M Bongrand,
G Broudin-Bay,
V Brudanin,
A J Caffrey, [......],
V Timkin,
S Torre,
V I Tretyak,
V Umatov,
L Vála,
I Vanyushin,
V Vasiliev,
V Vorobel,
Ts Vylov,
A Zukauskas
[show abstract]
[hide abstract]
ABSTRACT: We report results from the NEMO-3 experiment based on an exposure of 1275 days with 661 g of (130)Te in the form of enriched and natural tellurium foils. The ββ decay rate of (130)Te is found to be greater than zero with a significance of 7.7 standard deviations and the half-life is measured to be T(½)(2ν) = [7.0 ± 0.9(stat) ± 1.1(syst)] × 10(20) yr. This represents the most precise measurement of this half-life yet published and the first real-time observation of this decay.
Physical Review Letters 08/2011; 107(6):062504. · 7.37 Impact Factor
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R Arnold,
C. Augier,
J. Baker,
A. S. Barabash, A. Basharina-Freshville,
S. Blondel,
M. Bongrand,
G. Broudin-Bay,
V. Brudanin,
A. J. Caffrey, [......],
V. Timkin,
S Torre,
V. I. Tretyak,
V. Umatov,
L. Vála,
I. Vanyushin,
V. Vasiliev,
V. Vorobel,
T. Vylov,
A. Zukauskas
[show abstract]
[hide abstract]
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.
04/2011;
-
R. Arnold,
C. Augier,
J. Baker,
A. S. Barabash, A. Basharina-Freshville,
S. Blondel,
M. Bongrand,
G. Broudin-Bay,
V. Brudanin,
A. J. Caffrey, [......],
V. Timkin,
S. Torre,
V. I. Tretyak,
V. Umatov,
L. Vála,
I. Vanyushin,
V. Vasiliev,
V. Vorobel,
T. Vylov,
A. Zukauskas
[show abstract]
[hide abstract]
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.
04/2011; 4:128-131.
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J. Argyriades,
R. Arnold,
C. Augier,
J. Baker,
A.S. Barabash, A. Basharina-Freshville,
M. Bongrand,
C. Bourgeois,
D. Breton,
M. Brière, [......],
Vl.I. Tretyak,
V.I. Umatov,
L. Vála,
I.A. Vanyushin,
R. Vasiliev,
V.A. Vasiliev,
V. Vorobel,
D. Waters,
N. Yahlali,
A. Žukauskas
[show abstract]
[hide abstract]
ABSTRACT: The development of BiPo detectors is dedicated to the measurement of extremely high radiopurity in 208Tl and 214Bi for the SuperNEMO double beta decay source foils. A modular prototype, called BiPo-1, with 0.8 m2 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 208Tl. After more than one year of background measurement, a surface activity of the scintillators of is reported here. Given this level of background, a larger BiPo detector having 12 m2 of active surface area, is able to qualify the radiopurity of the SuperNEMO selenium double beta decay foils with the required sensitivity of (90% C.L.) with a six month measurement.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 05/2010;
-
J. Argyriades,
R Arnold,
C. Augier,
J. Baker,
A. S. Barabash, A. Basharina-Freshville,
M. Bongrand,
G. Broudin-Bay,
V. Brudanin,
A. J. Caffrey, [......],
G. Szklarz,
J Thomas,
V. Timkin,
V. I. Tretyak,
V. Umatov,
L. Vala,
I. Vanyushin,
V. Vasiliev,
V. Vorobel,
Ts. Vylov
[show abstract]
[hide abstract]
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. Comment: Published in Nucl.Phys.A (10 pages, 10 figures)
06/2009;
-
J. Argyriades,
R Arnold,
C. Augier,
J. Baker,
A. S. Barabash,
M. Bongrand,
G. Broudin-Bay,
V. B. Brudanin,
A. J. Caffrey,
S. Cebrián, [......],
Vl.I. Tretyak,
V. I. Umatov,
L. Vála,
I. A. Vanyushin,
R. Vasiliev,
V. Vorobel,
Ts. Vylov,
D Waters,
N. Yahlali,
A. Zukauskas
[show abstract]
[hide abstract]
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 ^207Bi 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.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
-
J. Argyriades,
R Arnold,
C. Augier,
J. Baker,
A. S. Barabash, A. Basharina-Freshville,
M. Bongrand,
G. Broudin-Bay,
V. Brudanin,
A. J. Caffrey, [......],
G. Szklarz,
J Thomas,
V. Timkin,
V. I. Tretyak,
V. Umatov,
L. Vála,
I. Vanyushin,
V. Vasiliev,
V. Vorobel,
Ts. Vylov
[show abstract]
[hide abstract]
ABSTRACT: Using 9.4 g of 96Zr isotope and 1221 days of data from the NEMO-3 detector corresponding to 0.031 kg y, the obtained 2νββ decay half-life measurement is View the MathML source. Different characteristics of the final state electrons have been studied, such as the energy sum, individual electron energy, and angular distribution. The 2ν nuclear matrix element is extracted using the measured 2νββ half-life and is M2ν=0.049±0.002. Constraints on 0νββ decay have also been set.
Nuclear Physics A.
-
J. Argyriades,
R Arnold,
C. Augier,
J. Baker,
A. S. Barabash, A. Basharina-Freshville,
M. Bongrand,
G. Broudin,
V. Brudanin,
A. J. Caffrey, [......],
G. Szklarz,
J Thomas,
V. Timkin,
V. Tretyak,
V. Umatov,
L. Vala,
I. Vanyushin,
V. Vasiliev,
V. Vorobel,
Ts. Vylov
[show abstract]
[hide abstract]
ABSTRACT: 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.
Physical Review C.
-
J. Argyriades,
R. Arnold,
C. Augier,
J. Baker,
A.S. Barabash,
M. Bongrand,
G. Broudin-Bay,
V.B. Brudanin,
A.J. Caffrey,
S. Cebrián, [......],
Vl.I. Tretyak,
V.I. Umatov,
L. Vála,
I.A. Vanyushin,
R. Vasiliev,
V. Vorobel,
Ts. Vylov,
D. Waters,
N. Yahlali,
A. Žukauskas
[show abstract]
[hide abstract]
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 207Bi 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.
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 625(1):20-28. · 1.21 Impact Factor
-
J. Argyriades,
R. Arnold,
C. Augier,
J. Baker,
A.S. Barabash, A. Basharina-Freshville,
M. Bongrand,
G. Broudin-Bay,
V. Brudanin,
A.J. Caffrey, [......],
G. Szklarz,
J. Thomas,
V. Timkin,
V.I. Tretyak,
V. Umatov,
L. Vála,
I. Vanyushin,
V. Vasiliev,
V. Vorobel,
Ts. Vylov
[show abstract]
[hide abstract]
ABSTRACT: Using 9.4 g of 96Zr isotope and 1221 days of data from the NEMO-3 detector corresponding to 0.031 kg y, the obtained 2νββ decay half-life measurement is . Different characteristics of the final state electrons have been studied, such as the energy sum, individual electron energy, and angular distribution. The 2ν nuclear matrix element is extracted using the measured 2νββ half-life and is M2ν=0.049±0.002. Constraints on 0νββ decay have also been set.
Nuclear Physics A.
-
J. Argyriades,
R. Arnold,
C. Augier,
J. Baker,
A. S. Barabash, A. Basharina-Freshville,
M. Bongrand,
G. Broudin,
V. Brudanin,
A. J. Caffrey, [......],
G. Szklarz,
J. Thomas,
V. Timkin,
V. Tretyak,
V. Umatov,
L. Vála,
I. Vanyushin,
V. Vasiliev,
V. Vorobel,
Ts. Vylov
[show abstract]
[hide abstract]
ABSTRACT: 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 T1/22ν=(9.11-0.22+0.25(stat.)±0.63(syst.))×1018 yr. The observed limit on the half-life for neutrinoless double-β decay is found to be T1/20ν>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.
Phys. Rev. C. 80(3).
