A5032163689- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Nuclear physics research studies
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Cosmology and Gravitation Theories
- Radioactive Decay and Measurement Techniques
- Medical Imaging Techniques and Applications
- Quantum, superfluid, helium dynamics
- Scientific Research and Discoveries
- Solar and Space Plasma Dynamics
- CCD and CMOS Imaging Sensors
- Superconducting and THz Device Technology
- Age of Information Optimization
- Spectroscopy and Laser Applications
- Microfluidic and Capillary Electrophoresis Applications
- Geotechnical and Geomechanical Engineering
- Gas Dynamics and Kinetic Theory
- Geophysical Methods and Applications
- Public Health in Brazil
Institut de Recherche sur les Lois Fondamentales de l'Univers
2016-2025
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016-2024
CEA Paris-Saclay
2018-2024
Université Paris-Saclay
2016-2024
University of Coimbra
2023
Laboratoire AstroParticule et Cosmologie
2015-2022
GANIL
2016-2021
Université Paris-Sud
2013-2021
Centre National de la Recherche Scientifique
2014-2021
Université Paris Cité
2015-2021
We have searched for solar axions or similar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup with improved conditions in all detectors. From absence of excess X-rays when magnet was pointing Sun, we set an upper limit on axion-photon coupling 8.8 x 10^{-11} GeV^{-1} at 95% CL m_a <~ 0.02 eV. This result is best experimental over a broad range axion masses and eV also supersedes previous derived from energy-loss arguments globular-cluster stars.
The International Axion Observatory (IAXO) will be a forth generation axion helioscope. As its primary physics goal, IAXO look for axions or axion-like particles (ALPs) originating in the Sun via Primakoff conversion of solar plasma photons. In terms signal-to-noise ratio, about 4–5 orders magnitude more sensitive than CAST, currently most powerful helioscope, reaching sensitivity to axion-photon couplings down few × 10−12 GeV−1 and thus probing large fraction unexplored ALP parameter space....
We have searched for solar axions or other pseudoscalar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup. Whereas we previously reported results from CAST with evacuated magnet bores (Phase I), setting limits on lower mass axions, here report where were filled 4He gas II) of variable pressure. The introduction generates a refractive photon mγ, thereby achieving maximum possible conversion rate those axion masses ma match mγ. With 160 different...
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 study different isotopes track outgoing electrons provides means discriminate underlying mechanisms for by measuring half-life electron angular energy distributions.
We present the case for a dark matter detector with directional sensitivity. This document was developed at 2009 CYGNUS workshop on detection, and contains contributions from theorists experimental groups in field. describe need sensitivity; each experiment presents their project's status; we close feasibility study scaling up to one ton detector, which would cost around $150M.
The CERN Axion Solar Telescope (CAST) has extended its search for solar axions by using 3He as a buffer gas. At T=1.8 K this allows larger pressure settings and hence sensitivity to higher axion masses than our previous measurements with 4He. With about 1 h of data taking at each 252 different we have scanned the mass range 0.39 eV < m_a 0.64 eV. From absence excess X-rays when magnet was pointing Sun set typical upper limit on axion-photon coupling g_ag 2.3 x 10^{-10} GeV^{-1} 95% CL, exact...
We study the feasibility of a new generation axion helioscope, most ambitious and promising detector solar axions to date. show that large improvements in magnetic field volume, x-ray focusing optics backgrounds are possible beyond those achieved CERN Axion Solar Telescope (CAST). For hadronic models, sensitivity axion-photon coupling gaγ ≳ few × 10−12 GeV−1 is conceivable, 1–1.5 orders magnitude CAST sensitivity. If also couple electrons, Sun produces larger flux for same value Peccei-Quinn...
Observing double beta decay with no neutrinos in the final state, would signal existence of lepton number violating processes and hint at neutrino being a Majorana particle. The impressive effort represented by NEMO-3 experiment sets important constraints on mass lepton-number processes.
The CERN Axion Solar Telescope has finished its search for solar axions with (3)He buffer gas, covering the range 0.64 eV ≲ ma 1.17 eV. This closes gap to cosmological hot dark matter limit and actually overlaps it. From absence of excess x rays when magnet was pointing Sun we set a typical upper on axion-photon coupling gaγ 3.3 × 10(-10) GeV(-1) at 95% C.L., exact value depending pressure setting. Future direct axion searches will focus increasing sensitivity smaller values gaγ, example by...
Khufu's Pyramid is one of the largest archaeological monument all over world, which still holds many mysteries. In 2016 and 2017, ScanPyramids team reported on several discoveries previously unknown voids by cosmic-ray muon radiography that a non-destructive technique ideal for investigation large-scale structures. Among these discoveries, corridor-shaped structure has been observed behind so-called Chevron zone North face, with length at least 5 meters. A dedicated study this was thus...
In this Technical Design Report (TDR) we describe the NEXT-100 detector that will search for neutrinoless double beta decay (ββ0ν) in 136XE at Laboratorio Subterráneo de Canfranc (LSC), Spain. The document formalizes design presented our Conceptual (CDR): an electroluminescence time projection chamber, with separate readout planes calorimetry and tracking, located, respectively, behind cathode anode. is designed to hold a maximum of about 150 kg xenon 15 bar, or 100 10 bar. This option...
In non-hadronic axion models, which have a tree-level axion-electron interaction, the Sun produces strong flux by bremsstrahlung, Compton scattering, and axio-recombination, ``BCA processes.'' Based on new calculation of this flux, including for first time we derive limits Yukawa coupling gae axion-photon interaction strength gaγ using CAST phase-I data (vacuum phase). For ma≲10 meV/c2 find < 8.1 × 10−23 GeV−1 at 95% CL. We stress that next-generation helioscope such as proposed IAXO could...
The NEMO-3 experiment at the Modane Underground Laboratory has investigated double-$\beta$ decay of $^{48}{\rm Ca}$. Using $5.25$ yr data recorded with a $6.99\,{\rm g}$ sample Ca}$, approximately $150$ candidate events have been selected signal-to-background ratio greater than $3$. half-life for two-neutrino Ca}$ measured to be $T^{2\nu}_{1/2}\,=\,[6.4\, ^{+0.7}_{-0.6}{\rm (stat.)} \, ^{+1.2}_{-0.9}{\rm (syst.)}] \times 10^{19}\,{\rm yr}$. A search neutrinoless yields null result and...
The Double Chooz collaboration presents a measurement of the neutrino mixing angle θ 13 using reactor $$ \overline{\nu_{\mathrm{e}}} observed via inverse beta decay reaction in which neutron is captured on hydrogen. This based 462.72 live days data, approximately twice as much data previous such analysis, collected with detector positioned at an average distance 1050 m from two cores. Several novel techniques have been developed to achieve significant reductions backgrounds and systematic...
NEXT is an experiment dedicated to neutrinoless double beta decay searches in xenon. The detector a TPC, holding 100 kg of high-pressure xenon enriched the 136 Xe isotope. It under construction Laboratorio Subterráneo de Canfranc Spain, and it will begin operations 2015. concept provides energy resolutionbetter than 1% FWHM topological signal that can be used reduce background. Furthermore, technology extrapolated 1 ton-scale experiment.
The NEMO-3 collaboration reports the half-life of ${}^{150}$Nd via two-neutrino double-beta decay mode to an unprecedented accuracy. For zero-neutrino ${}^{150}$Nd, distinctive signature possible Majorana nature neutrinos, no observations but sets new upper bounds for in various scenarios beyond standard model.
The full data set of the NEMO-3 experiment has been used to measure half-life two-neutrino double beta decay $$^{100}$$ Mo ground state Ru, $$T_{1/2} = \left[ 6.81 \pm 0.01\,\left( \text{ stat }\right) ^{+0.38}_{-0.40}\,\left( syst \right] \times 10^{18}$$ year. two-electron energy sum, single electron spectra and distribution angle between electrons are presented with an unprecedented statistics $$5\times 10^5$$ events a signal-to-background ratio $$\sim $$ 80. Clear evidence for Single...
We report the results of a search for neutrinoless double-$\ensuremath{\beta}$ decay ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) $^{100}\mathrm{Mo}$, using NEMO-3 detector to reconstruct full topology final state events. With an exposure $34.7\text{ }\text{ }\mathrm{kg}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{y}$, no evidence $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ signal has been found, yielding limit light Majorana neutrino mass mechanism...
Using data from the NEMO-3 experiment, we have measured two-neutrino double beta decay ( $$2\nu \beta $$ ) half-life of $$^{82}$$ Se as $$T_{\smash {1/2}}^{2\nu } \!=\! \left[ 9.39 \pm 0.17\left( \text{ stat }\right) 0.58\left( syst \right] \times 10^{19}$$ y under single-state dominance hypothesis for this nuclear transition. The corresponding matrix element is $$\left| M^{2\nu }\right| = 0.0498 0.0016$$ . In addition, a search neutrinoless $$0\nu using 0.93 kg observed total 5.25 has been...
The NEMO-3 experiment measured the half-life of $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay and searched for $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ $^{116}\mathrm{Cd}$. Using 410 g $^{116}\mathrm{Cd}$ installed in detector with an exposure 5.26 y, ($4968\ifmmode\pm\else\textpm\fi{}74$) events corresponding to ground state $^{116}\mathrm{Sn}$ have been observed a signal background ratio about 12. has be...
Muon tomography is a consolidated technique to investigate the internal components of high-opacity objects. With use detectors with high angular and spatial resolution (usually referred as “muon telescopes”), track reconstruction atmospheric muons after they have crossed object provides muography images, also called radiographs.” This work presents (or muon radiography) French historical UNGG (natural-uranium, graphite, gas) nuclear reactor: G3 reactor, located at CEA Marcoule. A measurement...
We have searched for 14.4 keV solar axions or more general axion-like particles (ALPs), that may be emitted in the M1 nuclear transition of 57Fe, by using axion-to-photon conversion CERN Axion Solar Telescope (CAST) with evacuated magnet bores (Phase I). From absence excess monoenergetic X-rays when was pointing to Sun, we set model-independent constraints on coupling constants pseudoscalar couple two photons and a nucleon gaγ|−1.19gaN0+gaN3| < 1.36 × 10−16 GeV−1 ma 0.03 eV at 95% confidence level.