Search results for: T. Lasserre

Items from 1 to 20 out of 26 results

article

Gamma-induced background in the KATRIN main spectrometer

K. Altenmüller, M. Arenz, W.-J. Baek, M. Beck, more

The European Physical Journal C > 2019 > 79 > 9 > 1-12

The KATRIN experiment aims to measure the effective electron antineutrino mass $$m_{\overline{\nu }_e}$$ mν¯e with a sensitivity of $${0.2}\,{\hbox {eV}/\hbox {c}^2}$$ 0.2eV/c2 using a gaseous tritium source combined with the MAC-E filter technique. A low background rate is crucial to achieving the proposed sensitivity, and dedicated measurements have been performed to study possible sources of...

article

A new experimental approach to probe QCD axion dark matter in the mass range above $${ 40}\,{\upmu }\mathrm{{eV}}$$ 40μeV

MADMAX Collaboration, P. Brun, A. Caldwell, L. Chevalier, more

The European Physical Journal C > 2019 > 79 > 3 > 1-16

The axion emerges in extensions of the Standard Model that explain the absence of CP violation in the strong interactions. Simultaneously, it can provide naturally the cold dark matter in our universe. Several searches for axions and axion-like particles (ALPs) have constrained the corresponding parameter space over the last decades but no unambiguous hints of their existence have been found. The...

article

Yields and production rates of cosmogenic ⁹Li and ⁸He measured with the Double Chooz near and far detectors

The Double Chooz collaboration, H. Kerret, T. Abrahão, H. Almazan, more

Journal of High Energy Physics > 2018 > 2018 > 11 > 1-20

Abstract The yields and production rates of the radioisotopes ⁹Li and ⁸He created by cosmic muon spallation on ¹²C, have been measured by the two detectors of the Double Chooz experiment. The identical detectors are located at separate sites and depths, which means that they are subject to different muon spectra. The near (far) detector has an overburden of ∼120 m.w.e. (∼300 m.w.e.) corresponding...

article

Reduction of stored-particle background by a magnetic pulse method at the KATRIN experiment

M. Arenz, W.-J. Baek, S. Bauer, M. Beck, more

The European Physical Journal C > 2018 > 78 > 9 > 1-16

The KATRIN experiment aims to determine the effective electron neutrino mass with a sensitivity of $${0.2}{\hbox { eV/c}^{2}}$$ 0.2eV/c2 (%90 CL) by precision measurement of the shape of the tritium $$\upbeta $$ β -spectrum in the endpoint region. The energy analysis of the decay electrons is achieved by a MAC-E filter spectrometer. A common background source in this setup is the decay of short-lived...

article

Calibration of high voltages at the ppm level by the difference of $$^{83{\mathrm{m}}}$$ 83m Kr conversion electron lines at the KATRIN experiment

M. Arenz, W.-J. Baek, M. Beck, A. Beglarian, more

The European Physical Journal C > 2018 > 78 > 5 > 1-7

The neutrino mass experiment KATRIN requires a stability of 3 ppm for the retarding potential at − 18.6 kV of the main spectrometer. To monitor the stability, two custom-made ultra-precise high-voltage dividers were developed and built in cooperation with the German national metrology institute Physikalisch-Technische Bundesanstalt (PTB). Until now, regular absolute calibration of the voltage dividers...

article

Reactor antineutrino shoulder explained by energy scale nonlinearities?

G. Mention, M. Vivier, J. Gaffiot, T. Lasserre, more

Physics Letters B > 2017 > 773 > C > 307-312

The Daya Bay, Double Chooz and RENO experiments recently observed a significant distortion in their detected reactor antineutrino spectra, being at odds with the current predictions. Although such a result suggests to revisit the current reactor antineutrino spectra modeling, an alternative scenario, which could potentially explain this anomaly, is explored in this letter. Using an appropriate statistical...

article

The search for sterile neutrinos with SOX-Borexino

K. Altenmüller, M. Agostini, S. Appel, G. Bellini, more

Physics of Atomic Nuclei > 2016 > 79 > 11-12 > 1481-1484

The aim of the SOX-Borexino project is to verify or falsify the existence of eV-scale sterile neutrinos. The existence of sterile neutrinos is suspected because of several anomalies, which were observed in previous experiments. A ~3.7 PBq electron antineutrino source made of ¹⁴⁴Ce will be installed below the Borexino detector at LNGS, Italy, to search for short-baseline oscillations of active-to-sterile...

article

Measurement of θ ₁₃ in Double Chooz using neutron captures on hydrogen with novel background rejection techniques

The Double Chooz collaboration, Y. Abe, S. Appel, T. Abrahão, more

Journal of High Energy Physics > 2016 > 2016 > 1 > 1-29

Abstract The Double Chooz collaboration presents a measurement of the neutrino mixing angle θ ₁₃ using reactor ν e ¯ $$ \overline{\nu_{\mathrm{e}}} $$ observed via the inverse beta decay reaction in which the neutron is captured on hydrogen. This measurement is based on 462.72 live days data, approximately twice as much data as in the previous such analysis, collected with...

article

Erratum to: Improved measurements of the neutrino mixing angle θ ₁₃ with the Double Chooz detector

The Double Chooz collaboration, Y. Abe, J. C. Anjos, J. C. Barriere, more

Journal of High Energy Physics > 2015 > 2015 > 2 > 1-4

article

Precision muon reconstruction in Double Chooz

Y. Abe, J.C. dos Anjos, J.C. Barriere, E. Baussan, more

Nuclear Instruments and Methods in Physics Research Section A: Accelerators,... > 2014 > 764 > C > 330-339

We describe a muon track reconstruction algorithm for the reactor anti-neutrino experiment Double Chooz. The Double Choozdetector consists of two optically isolated volumes of the liquid scintillator viewed by PMTs, and an Outer Veto above these made of crossed scintillator strips. Muons are reconstructed by their Outer Veto hit positions along with timing information from the other two detector volumes...

article

Improved measurements of the neutrino mixing angle θ₁₃ with the Double Chooz detector

The Double Chooz collaboration, Y. Abe, J. C. Anjos, J. C. Barriere, more

Journal of High Energy Physics > 2014 > 2014 > 10 > 1-44

Abstract The Double Chooz experiment presents improved measurements of the neutrino mixing angle θ₁₃ using the data collected in 467.90 live days from a detector positioned at an average distance of 1050 m from two reactor cores at the Chooz nuclear power plant. Several novel techniques have been developed to achieve significant reductions of the backgrounds and systematic uncertainties with respect...

article

Ortho-positronium observation in the Double Chooz experiment

The Double Chooz collaboration, Y. Abe, J. C. Anjos, J. C. Barriere, more

Journal of High Energy Physics > 2014 > 2014 > 10 > 1-17

Abstract The Double Chooz experiment measures the neutrino mixing angle θ₁₃ by detecting reactor ν ¯ e $$ {\overline{\nu}}_e $$ via inverse beta decay. The positron-neutron space and time coincidence allows for a sizable background rejection, nonetheless liquid scintillator detectors would profit from a positron/electron discrimination, if feasible in large detector, to suppress the...

article

Background-independent measurement of θ13 in Double Chooz

Y. Abe, J.C. dos Anjos, J.C. Barriere, E. Baussan, more

Physics Letters B > 2014 > 735 > Complete > 51-56

The oscillation results published by the Double Chooz Collaboration in 2011 and 2012 rely on background models substantiated by reactor-on data. In this analysis, we present a background-model-independent measurement of the mixing angle θ ₁ ₃ by including 7.53 days of reactor-off data. A global fit of the observed antineutrino rates for different reactor power conditions is performed,...

article

First measurement of θ13 from delayed neutron capture on hydrogen in the Double Chooz experiment

Y. Abe, C. Aberle, J.C. dos Anjos, J.C. Barriere, more

Physics Letters B > 2013 > 723 > 1-3 > 66-70

The Double Chooz experiment has determined the value of the neutrino oscillation parameter θ13 from an analysis of inverse beta decay interactions with neutron capture on hydrogen. This analysis uses a three times larger fiducial volume than the standard Double Chooz assessment, which is restricted to a region doped with gadolinium (Gd), yielding an exposure of 113.1 GW-ton-years. The data sample...

article

A large HPGe detector for the non-destructive radioassay of an ultra-low-background counting facility

M. Fechner, C. Henson, J. Gaffiot, T. Lasserre, more

Applied Radiation and Isotopes > 2011 > 69 > 7 > 1033-1038

We present the use of a low background counting facility, equipped with a p-type 80% relative efficiency HPGe detector, protected by active and passive shielding, and large enough to count a 10in photo-multiplier tube (PMT). A GEANT4 Monte-Carlo of this detector was developed and tuned to 3% accuracy. We report the U, Th, and K content in three different types of PMTs used in current neutrino experiments,...

article

Reactor Neutrino Detection for Non-Proliferation With the NUCIFER Experiment

A Porta, V Bui, M Cribier, M Fallot, more

IEEE Transactions on Nuclear Science > 2010 > 57 > 5-2 > 2732 - 2739

The major advances achieved over the last decades in the understanding of fundamental neutrino physics allow us to apply the detection of reactor antineutrino signals to automatic and nonintrusive nuclear power plant surveys. Here, we present the NUCIFER experiment, a 1-ton Gd-doped liquid scintillator detector to be installed a few 10 m from a reactor core for measurements of its thermal power and...

chapter

Reactor Neutrino Detection for Non Proliferation with the NUCIFER Experiment

A Porta, V M Bui, M Cribier, M Fallot, more

2009 1st International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications > 1 - 8

2009 1st International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications (ANIMMA)

The major advances achieved over the last decades in the understanding of fundamental neutrino physics allow us to apply the detection of reactor antineutrino signals to automatic and non-intrusive nuclear power plant surveys. Here we present the NUCIFER experiment, a 1 ton Gd-doped liquid scintillator detector to be installed a few 10 m from a reactor core for measurements of its thermal power and...

article

Luminescent properties of a new In-based organic liquid scintillation system

C. Buck, F.X. Hartmann, T. Lasserre, D. Motta, more

Journal of Luminescence > 2004 > 106 > 1 > 57-67

A novel liquid scintillator system using metal β-diketonate chemistry based on loadings of indium, a target of current interest in low energy solar neutrino detection, is developed. The optical absorption, fluorescence and scintillation properties for this new system are described. The scintillation light output as found from the irradiation by low energy gamma-rays is presented. Notable light yields...

article

KamLAND, terrestrial heat sources and neutrino oscillations

G Fiorentini, T Lasserre, M Lissia, B Ricci, more

Physics Letters B > 2003 > 558 > 1-2 > 15-21

We comment on the first indication of geo-neutrino events from KamLAND and on the prospects for understanding Earth energetics. Practically all models of terrestrial heat production are consistent with data within the presently limited statistics, the fully radiogenic model being closer to the observed value (≈9 geo-events). In a few years KamLAND should collect sufficient data for a clear evidence...

article

LLBF: LENS prototype at Gran Sasso

D. Motta, C. Buck, G. Heusser, F.X. Hartmann, more

Nuclear Physics B (Proceedings Supplements) > 2003 > 118 > Complete > 451

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Search results for: T. Lasserre

Gamma-induced background in the KATRIN main spectrometer

A new experimental approach to probe QCD axion dark matter in the mass range above $${ 40}\,{\upmu }\mathrm{{eV}}$$ 40μeV

Yields and production rates of cosmogenic ⁹Li and ⁸He measured with the Double Chooz near and far detectors

Reduction of stored-particle background by a magnetic pulse method at the KATRIN experiment

Calibration of high voltages at the ppm level by the difference of $$^{83{\mathrm{m}}}$$ 83m Kr conversion electron lines at the KATRIN experiment

Reactor antineutrino shoulder explained by energy scale nonlinearities?

The search for sterile neutrinos with SOX-Borexino

Measurement of θ ₁₃ in Double Chooz using neutron captures on hydrogen with novel background rejection techniques

Erratum to: Improved measurements of the neutrino mixing angle θ ₁₃ with the Double Chooz detector

Precision muon reconstruction in Double Chooz

Improved measurements of the neutrino mixing angle θ₁₃ with the Double Chooz detector

Ortho-positronium observation in the Double Chooz experiment

Background-independent measurement of θ13 in Double Chooz

First measurement of θ13 from delayed neutron capture on hydrogen in the Double Chooz experiment

A large HPGe detector for the non-destructive radioassay of an ultra-low-background counting facility

Reactor Neutrino Detection for Non-Proliferation With the NUCIFER Experiment

Reactor Neutrino Detection for Non Proliferation with the NUCIFER Experiment

Luminescent properties of a new In-based organic liquid scintillation system

KamLAND, terrestrial heat sources and neutrino oscillations

LLBF: LENS prototype at Gran Sasso

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