M.-C. Piro
A5076172916- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Radiation Therapy and Dosimetry
- High-Energy Particle Collisions Research
- Radiation Detection and Scintillator Technologies
- Advanced Semiconductor Detectors and Materials
- Nuclear Physics and Applications
- Scientific Research and Discoveries
- Quantum, superfluid, helium dynamics
- Advanced Thermodynamics and Statistical Mechanics
- CCD and CMOS Imaging Sensors
- Astronomy and Astrophysical Research
- Combustion and Detonation Processes
- Radioactive Decay and Measurement Techniques
- Superconducting and THz Device Technology
- Galaxies: Formation, Evolution, Phenomena
- Advanced NMR Techniques and Applications
- Flow Measurement and Analysis
- Cerebral Palsy and Movement Disorders
- Nuclear Materials and Properties
University of Alberta
2009-2025
Queen's University
2009-2023
Arthur B. McDonald-Canadian Astroparticle Physics Research Institute
2020-2023
Institute of Physics, Academia Sinica
2023
University of Cagliari
2023
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2023
University of California, Riverside
2023
Princeton University
2023
CEA Paris-Saclay
2013-2021
University of Birmingham
2021
We report the first dark matter search results from XENON1T, a ∼2000-kg-target-mass dual-phase (liquid-gas) xenon time projection chamber in operation at Laboratori Nazionali del Gran Sasso Italy and ton-scale detector of this kind. The blinded used 34.2 live days data acquired between November 2016 January 2017. Inside (1042±12)-kg fiducial mass [5,40] keV_{nr} energy range interest for weakly interacting massive particle (WIMP) searches, electronic recoil background was (1.93±0.25)×10^{-4}...
DARk matter WImp search with liquid xenoN (DARWIN) will be an experiment for the direct detection of dark using a multi-ton xenon time projection chamber at its core. Its primary goal to explore experimentally accessible parameter space Weakly Interacting Massive Particles (WIMPs) in wide mass-range, until neutrino interactions target become irreducible background. The prompt scintillation light and charge signals induced by particle observed VUV sensitive, ultra-low background photosensors....
Final results are reported from operation of the PICO-60 C$_3$F$_8$ dark matter detector, a bubble chamber filled with 52 kg located in SNOLAB underground laboratory. The was operated at thermodynamic thresholds as low 1.2 keV without loss stability. A new blind 1404-kg-day exposure 2.45 threshold acquired approximately same expected total background rate previous 1167-kg-day 3.3 keV. This increased is enabled part by optical tracking analysis to better identify events near detector walls,...
Recent results from the PICASSO dark matter search experiment at SNOLAB are reported. These were obtained using a subset of 10 detectors with total target mass 0.72 kg 19F and an exposure 114 kgd. The low backgrounds in allow recoil energy thresholds as 1.7 keV to be which increased sensitivity interactions Weakly Interacting Massive Particles (WIMPs) masses below GeV/c^2. No signal was found. Best exclusion limits spin dependent sector for WIMP 20 GeV/c^2 cross section on protons sigma_p^SD...
DEAP-3600 is a single-phase liquid argon (LAr) direct-detection dark matter experiment, operating 2 km underground at SNOLAB (Sudbury, Canada). The detector consists of 3279 kg LAr contained in spherical acrylic vessel. This paper reports on the analysis $758\text{ }\text{ }\mathrm{tonne}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{day}$ exposure taken over period 231 live-days during first year operation. No candidate signal events are observed WIMP-search region interest, which...
The field of dark matter detection is a highly visible and competitive one. In this paper, we propose recommendations for presenting direct results particularly suited weak-scale searches, although believe the spirit can apply more broadly to searches other candidates, such as very light or axions. To translate experimental data into final published result, collaborations must make series choices in their analysis, ranging from how model astrophysical parameters statistical inferences based...
We report on WIMP search results of the XENON100 experiment, combining three runs summing up to 477 live days from January 2010 2014. Data first two were already published. A blind analysis was applied last run recorded between April 2013 and 2014 prior results. The ultra-low electromagnetic background ~$5 \times 10^{-3}$ events/(keV$_{\mathrm{ee}}\times$kg$\times$day) before electronic recoil rejection, together with increased exposure 48 kg $\times$ yr improves sensitivity. profile...
Dark matter with Planck-scale mass (≃10^{19} GeV/c^{2}) arises in well-motivated theories and could be produced by several cosmological mechanisms. A search for multiscatter signals from supermassive dark was performed a blind analysis of data collected over 813 d live time DEAP-3600, 3.3 t single-phase liquid argon-based detector at SNOLAB. No candidate were observed, leading to the first direct detection constraints on matter. Leading limits constrain masses between 8.3×10^{6} 1.2×10^{19}...
Spherical proportional counters (SPCs) are gaseous particle detectors sensitive to single ionization electrons in their target media, with large detector volumes and low background rates. The $\mbox{NEWS-G}$ collaboration employs this technology search for low-mass dark matter, having previously performed searches at the Laboratoire Souterrain de Modane (LSM), including a recent campaign 135 cm diameter SPC filled methane. While situ calibrations of response were carried out LSM,...
The NEWS-G direct detection experiment uses spherical proportional counters to search for light dark matter candidates. New results from a 10 day physics run with 135 cm in diameter counter at the Laboratoire Souterrain de Modane are reported. target consists of 114 g methane, providing sensitivity spin-dependent coupling protons. constraints presented mass range 0.17 1.2 GeV/c^{2}, 90% confidence level cross-section upper limit 30.9 pb 0.76 GeV/c^{2}.
The PICASSO collaboration observed for the first time a significant difference between acoustic signals induced by neutrons and alpha particles in detector based on superheated liquids. This new discovery offers possibility of improved background suppression could be especially useful dark matter experiments. effect may attributed to formation multiple bubbles tracks, compared single nucleations created neutron-induced recoils.
We report on a dark matter search for Weakly Interacting Massive Particle (WIMP) in the mass range $$m_{\chi } \in [4, 30]\,\mathrm{GeV/}c^2$$ with EDELWEISS-III experiment. A 2D profile likelihood analysis is performed data from eight selected detectors lowest energy thresholds leading to combined fiducial exposure of 496 kg-days. External backgrounds $$\gamma $$ - and $$\beta -radiation, recoils $$^{206}\mathrm{Pb}$$ neutrons as well detector intrinsic were modelled outside region interest...
We present the results of a search for elastic scattering from galactic dark matter in form Weakly Interacting Massive Particles (WIMPs) 4-30 GeV/$c^2$ mass range. make use 582 kg-day fiducial exposure an array 800 g Germanium bolometers equipped with set interleaved electrodes full surface coverage. searched specifically $\sim 2.5-20$ keV nuclear recoils inside detector volume. As illustration number observed events 5 (resp. 20) WIMPs are 9 4), compared to expected background 6.1 1.4). A...
We report on a search for electronic recoil event rate modulation signatures in the XENON100 data accumulated over period of 4 years, from January 2010 to 2014. A profile likelihood method, which incorporates stability detector and known background model, is used quantify significance periodicity time distribution events. There weak signature at $431^{+16}_{-14}$ days low energy region $(2.0-5.8)$ keV single scatter sample, with global $1.9\,\sigma$, however no other more significant...
We present new constraints on the couplings of axions and more generic axion-like particles using data from EDELWEISS-II experiment. The EDELWEISS experiment, located at Underground Laboratory Modane, primarily aims direct detection WIMPs germanium bolometers. It is also sensitive to low-energy electron recoils that would be induced by solar or dark matter axions. Using a total exposure up 448 kg.d, we searched for axion-induced down 2.5 keV within four scenarios involving different...
The XENON1T dark matter experiment aims to detect Weakly Interacting Massive Particles (WIMPs) through low-energy interactions with xenon atoms. To such a rare event necessitates the use of radiopure materials minimize number background events within expected WIMP signal region. In this paper we report results an extensive material radioassay campaign for experiment. Using gamma-ray spectroscopy and mass spectrometry techniques, systematic measurements trace radioactive impurities in over...
We present the first constraints on spin-dependent, inelastic scattering cross section of weakly interacting massive particles (WIMPs) nucleons from XENON100 data with an exposure $7.64\ifmmode\times\else\texttimes\fi{}{10}^{3}\text{ }\text{ }\mathrm{kg}\ifmmode\cdot\else\textperiodcentered\fi{}\text{days}$. is a dual-phase xenon time projection chamber 62 kg active mass, operated at Laboratori Nazionali del Gran Sasso (LNGS) in Italy and designed to search for nuclear recoils WIMP-nucleus...
The XENON1T experiment aims for the direct detection of dark matter in a detector filled with 3.3 tons liquid xenon. In order to achieve desired sensitivity, background induced by radioactive decays inside has be sufficiently low. One major contributor is $$\beta $$ -emitter $$^{85}$$ Kr which present For concentration natural krypton xenon $$\mathrm {^{nat}\mathrm{Kr/Xe}\,<\,200\,ppq}$$ (parts per quadrillion, $$1~\mathrm{ppq}~=10^{-15} \mathrm{mol/mol}$$ ) required. this work, design,...
We report on weakly interacting massive particles (WIMPs) search results in the XENON100 detector using a nonrelativistic effective field theory approach. The data from science run II ($34\text{ }\text{ }\mathrm{kg}\ifmmode\times\else\texttimes\fi{}224.6$ live days) were reanalyzed, with an increased recoil energy interval compared to previous analyses, ranging $(6.6--240)\text{ }{\mathrm{keV}}_{\mathrm{nr}}$. are found be compatible background-only hypothesis. present 90% confidence level...
The physics reach of a low threshold (100 eV) scintillating argon bubble chamber sensitive to Coherent Elastic neutrino-Nucleus Scattering (CE$\nu$NS) from reactor neutrinos is studied. sensitivity the weak mixing angle, neutrino magnetic moment, and light $Z'$ gauge boson mediator are analyzed. A Monte Carlo simulation backgrounds performed assess their contribution signal. analysis shows that world-leading sensitivities achieved with one-year exposure for 10 kg at 3 m 1 MW$_{th}$ research...
The LUMINEU (Luminescent Underground Molybdenum Investigation for NEUtrino mass and nature) project envisages a high-sensitivity search neutrinoless double beta (0ν 2β) decay of 100Mo with the help scintillating bolometers based on zinc molybdate (ZnMoO4) crystals. One crucial points successful performance this experiment is development protocol producing high quality large ZnMoO4 crystal scintillators extremely internal radiopurity. Here we report significant progress in volume crystalline...
We describe the purification of xenon from traces radioactive noble gas radon using a cryogenic distillation column. The column was integrated into loop XENON100 detector for online removal. This enabled us to significantly reduce constant $$^{222}$$ Rn background originating emanation. After inserting an auxiliary emanation source in loop, we determined reduction factor $$R\,>\,27$$ (95% C.L.) by monitoring activity concentration inside detector.
DEAP-3600 is a single-phase liquid argon detector aiming to directly detect weakly interacting massive particles (WIMPs), located at SNOLAB (Sudbury, Canada). After analyzing data taken during the first year of operation, null result was used place an upper bound on WIMP-nucleon, spin-independent, isoscalar cross section. This study reinterprets this within nonrelativistic effective field theory framework and further examines how various possible substructures in local dark matter halo may...
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...