J.-F. Muraz
A5033664205- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Diamond and Carbon-based Materials Research
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Ion-surface interactions and analysis
- High-Energy Particle Collisions Research
- Radiation Effects in Electronics
- Advanced Radiotherapy Techniques
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Medical Imaging Techniques and Applications
- Scientific Research and Discoveries
- Boron Compounds in Chemistry
- CCD and CMOS Imaging Sensors
- Muon and positron interactions and applications
- Nuclear physics research studies
- Stochastic processes and financial applications
- Quantum, superfluid, helium dynamics
- Quantum Mechanics and Applications
Laboratoire de Physique Subatomique et de Cosmologie
2016-2025
Université Grenoble Alpes
2014-2024
Institut National de Physique Nucléaire et de Physique des Particules
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Institut polytechnique de Grenoble
2019-2024
Laboratoire d’Annecy de Physique des Particules
2023
Université de Strasbourg
2018
Université de Lyon
2018
Université Joseph Fourier
2002-2016
The Polarized Electrons for Positrons experiment at the injector of Continuous Electron Beam Accelerator Facility has demonstrated first time efficient transfer polarization from electrons to positrons produced by polarized bremsstrahlung radiation induced a electron beam in high-Z target. Positron up 82% have been measured an initial momentum 8.19 MeV/c, limited only polarization. This technique extends positron capabilities GeV MeV beams, and opens access physics wide community.
We recently proposed a new approach for the real-time monitoring of particle therapy treatments with goal achieving high sensitivities on range measurement already at limited counting statistics. This method extends Prompt Gamma (PG) timing technique to obtain PG vertex distribution from exclusive Time-Of-Flight (TOF). It was previously shown, through Monte Carlo simulation, that an original data reconstruction algorithm (Prompt Time Imaging) allows combine response multiple detectors placed...
Abstract The New Experiments With Spheres-Gas (NEWS-G) collaboration intends to achieve sub-GeV/c 2 Weakly Interacting Massive Particles (WIMPs) detection using Spherical Proportional Counters (SPCs). SPCs are gaseous detectors relying on ionisation with a single ionization electron energy threshold. latest generation of SPC for direct dark matter searches has been installed at SNOLAB in Canada 2021. This article details the different processes involved fabrication NEWS-G experiment. Also...
Spherical Proportional Counters (SPCs) are a novel gaseous detector technology employed by the NEWS-G low-mass dark matter search experiment for their high sensitivity to single electrons from ionization. In this paper, we report on first characterization of electron response SPCs with unprecedented precision, using UV-laser calibration system. The experimental approach and analysis methodology presented along various direct applications upcoming next phase at SNOLAB. These include...
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The NEWS-G collaboration uses spherical proportional counters (SPCs) to search for weakly interacting massive particles (WIMPs). In this paper, we report the first measurements of nuclear quenching factor in neon gas at 2 bar using an SPC deployed a neutron beam TUNL facility. energy-dependence is modeled simple power law: $\ensuremath{\alpha}{\mathrm{E}}_{\mathrm{nr}}^{\ensuremath{\beta}}$; determine its parameters by simultaneously fitting data collected with detector over range energies....
MIMAC (MIcro-TPC MAtrix of Chambers) is a directional WIMP Dark Matter detector project. Direct dark matter experiments need high level electron/recoil discrimination to search for nuclear recoils produced by WIMP-nucleus elastic scattering. In this paper, we proposed an original method electron event rejection based on multivariate analysis applied experimental data acquired using monochromatic neutron fields. This shows that 105 power reachable discrimination. Moreover, the efficiency was...
We present the conceptual design and physics potential of DarkSPHERE, a proposed 3 m in diameter spherical proportional counter electroformed underground at Boulby Underground Laboratory. This effort builds on R&D performed experience acquired by NEWS-G Collaboration. DarkSPHERE is primarily designed to search for nuclear recoils from light dark matter 0.05--10 GeV mass range. Electroforming shell implementation shield based pure water ensures background level below 0.01 dru. These, combined...
Microbeam radiation therapy (MRT) is a radiotherapy technique combining spatial fractionation of the dose distribution on micrometric scale, X-rays in 50–500 keV range and rates up to 16 × 10 3 Gy s −1 . Nowadays, vivo dosimetry remains challenge due ultra-high fluxes involved need for high-spatial-resolution detectors. The aim here was develop striped diamond portal detector enabling online microbeam monitoring during synchrotron MRT treatments. detector, 550 µm bulk monocrystalline...
Directional detection of non-baryonic Dark Matter is a promising search strategy for discriminating WIMP events from neutrons, the ultimate background dark matter direct detection. This requires both precise measurement energy down to few keV and 3D reconstruction tracks mm. The MIMAC (MIcro-tpc MAtrix Chambers) collaboration has developed in last years an original prototype detector based on coupling large pixelized micromegas with special fast self-triggered electronics showing feasibility...
Kaluza-Klein axions appear in theories with extra dimensions as higher mass, significantly shorter lifetime, excitations of the Peccei-Quinn axion. When produced Sun, they would remain gravitationally trapped solar system, and their decay to a pair photons could provide an explanation corona heating problem. A low-density detector discriminate such signal from background, by identifying separation interaction point two photons. The NEWS-G collaboration uses large volume spherical...
The MoniDiam project is part of the French national collaboration CLaRyS (Contrôle en Ligne de l’hAdronthérapie par RaYonnements Secondaires) for on-line monitoring hadron therapy. It relies on imaging nuclear reaction products that related to ion range. goal here provide large area beam detectors with a high detection efficiency carbon or proton beams giving time and position measurement at 100 MHz count rates (beam tagging hodoscope). High radiation hardness intrinsic electronic properties...
The dark matter directional detection opens a new field in cosmology bringing the possibility to build map of nuclear recoils that would be able explore galactic halo giving access particle characterization such and shape halo. MIMAC (MIcro-tpc MAtrix Chambers) collaboration has developed last years an original prototype detector based on direct coupling large pixelized micromegas with devoted fast self-triggered electronics showing feasibility generation detectors. discovery potential this...
The amount of energy released by a nuclear recoil ionizing the atoms active volume detection appears "quenched" compared to an electron same kinetic energy. This different behavior in ionization between electrons and nuclei is described Ionization Quenching Factor (IQF) it plays crucial role direct dark matter searches. For low energies (below $50~\mathrm{keV}$), IQF measurements deviate significantly from common models used for theoretical predictions simulations. We report proton,...