J. Billard
A5006845459- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Liquid Crystal Research Advancements
- Radiation Detection and Scintillator Technologies
- CCD and CMOS Imaging Sensors
- Molecular spectroscopy and chirality
- Superconducting and THz Device Technology
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Medical Imaging and Pathology Studies
- Surfactants and Colloidal Systems
- Medical Imaging Techniques and Applications
- Synthesis and Properties of Aromatic Compounds
- Scientific Research and Discoveries
- Cancer Treatment and Pharmacology
- Nuclear physics research studies
- Radiation Therapy and Dosimetry
- Particle accelerators and beam dynamics
- Radioactive Decay and Measurement Techniques
- Chemical Thermodynamics and Molecular Structure
- Physics of Superconductivity and Magnetism
- Nuclear Physics and Applications
Institute of Nuclear Physics of Lyon
2016-2024
Institut de Physique des 2 Infinis de Lyon
2019-2024
Centre National de la Recherche Scientifique
2014-2023
Institut National de Physique Nucléaire et de Physique des Particules
2010-2023
Université Claude Bernard Lyon 1
2015-2023
Manoir Industries (France)
2016-2018
Institut de Physique
2016-2018
Institut Français de la Brasserie et de la Malterie
2017
Université Grenoble Alpes
2010-2016
Laboratoire de Physique Subatomique et de Cosmologie
2009-2016
As direct dark matter experiments continue to increase in size, they will become sensitive neutrinos from astrophysical sources. For that do not have directional sensitivity, coherent neutrino scattering several sources represents an important background understand, as it can almost perfectly mimic authentic weakly interacting massive particle (WIMP) signal. Here we explore detail the effect of backgrounds on discovery potential WIMPs over entire mass range 500 MeV 10 TeV. We show that,...
We report a first search for weakly interacting massive particles (WIMPs) using the background rejection capabilities of SuperCDMS. An exposure 577 kg days was analyzed WIMPs with mass <30 GeV/c(2), signal region blinded. Eleven events were observed after unblinding. set an upper limit on spin-independent WIMP-nucleon cross section 1.2×10(-42) cm(2) at 8 GeV/c(2). This result is in tension WIMP interpretations recent experiments and probes new parameter space scattering masses <6
We report results of a search for weakly interacting massive particles (WIMPS) with the silicon detectors CDMS II experiment. This blind analysis 140.2 kg day data taken between July 2007 and September 2008 revealed three WIMP-candidate events surface-event background estimate 0.41(-0.08)(+0.20)(stat)(-0.24)(+0.28)(syst). Other known backgrounds from neutrons 206Pb are limited to <0.13 <0.08 at 90% confidence level, respectively. The exposure this is equivalent 23.4 recoil energy range 7-100...
The CDMS low ionization threshold experiment (CDMSlite) uses cryogenic germanium detectors operated at a relatively high bias voltage to amplify the phonon signal in search for weakly interacting massive particles (WIMPs). Results are presented from second CDMSlite run with an exposure of 70 kg day, which reached energy electron recoils as 56 eV. A fiducialization cut reduces backgrounds below those previously reported by CDMSlite. New parameter space WIMP-nucleon spin-independent cross...
SuperCDMS is an experiment designed to directly detect Weakly Interacting Massive Particles (WIMPs), a favored candidate for dark matter ubiquitous in the Universe. In this paper, we present WIMP-search results using calorimetric technique call CDMSlite, which relies on voltage- assisted Luke-Neganov amplification of ionization energy deposited by particle interactions. The data were collected with single 0.6 kg germanium detector running 10 live days at Soudan Underground Laboratory. A low...
The EDELWEISS collaboration has performed a search for dark matter particles with masses below the GeV-scale 33.4-g germanium cryogenic detector operated in surface lab. energy deposits were measured using neutron-transmutation-doped Ge thermal sensor 17.7~eV (RMS) baseline heat resolution leading to 60~eV analysis threshold. Despite moderate lead shielding and high-background environment, first sub-GeV spin-independent limit based on target been achieved. experiment provides most stringent,...
We present the first Ge-based constraints on sub-MeV/c^{2} dark matter (DM) particles interacting with electrons using a 33.4 g Ge cryogenic detector 0.53 electron-hole pair (rms) resolution, operated underground at Laboratoire Souterrain de Modane. Competitive are set DM-electron scattering cross section, as well kinetic mixing parameter of photons down to 1 eV/c^{2}. In particular, most stringent limits for photon DM in 6 9 eV/c^{2} range. These results demonstrate high relevance detectors...
Many low-threshold experiments observe sharply rising event rates of yet unknown origins below a few hundred eV, and larger than expected from known backgrounds. Due to the significant impact this excess on dark matter or neutrino sensitivity these experiments, collective effort has been started share knowledge about individual observations. For this, EXCESS Workshop was initiated. In its first iteration in June 2021, ten rare search collaborations contributed initiative via talks...
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.
Direct detection dark matter experiments looking for WIMP-nucleus elastic scattering will soon be sensitive to an irreducible background from neutrinos which drastically affect their discovery potential. Here we explore how the neutrino future ton-scale considering both spin-dependent and spin-independent interactions. We show that combining data using different targets can improve potential due target complementarity. find in context of interactions, results several greatly enhance...
This paper reports on the development of a technology involving $$^{100}\hbox {Mo}$$ -enriched scintillating bolometers, compatible with goals CUPID, proposed next-generation bolometric experiment to search for neutrinoless double-beta decay. Large mass ( $$\sim 1~\hbox {kg}$$ ), high optical quality, radiopure -containing zinc and lithium molybdate crystals have been produced used develop performance single detector modules based 0.2–0.4 kg bolometers. In particular, energy resolution...
We present the potential sensitivity of a future recoil detector for first detection process coherent elastic neutrino nucleus scattering (CEνNS). use Chooz reactor complex in France as our luminous source neutrinos. Leveraging ability to cleanly separate rate correlated with thermal power against (uncorrelated) backgrounds, we show that 10 kg cryogenic bolometric array 100 eV threshold should be able extract CEνNS signal within one year running.
Abstract CUPID-Mo is a bolometric experiment to search for neutrinoless double-beta decay ( $$0\nu \beta $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>0</mml:mn><mml:mi>ν</mml:mi><mml:mi>β</mml:mi><mml:mi>β</mml:mi></mml:mrow></mml:math> ) of $$^{100}\hbox {Mo}$$ xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msup><mml:mrow /><mml:mn>100</mml:mn></mml:msup><mml:mtext>Mo</mml:mtext></mml:mrow></mml:math> . In this article, we detail the detector...
The CUPID-Mo experiment at the Laboratoire Souterrain de Modane (France) is a demonstrator for CUPID, next-generation ton-scale bolometric $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ experiment. It consists of 4.2 kg array 20 enriched ${\mathrm{Li}}_{2}$$^{100}\mathrm{Mo}{\mathrm{O}}_{4}$ scintillating bolometers to search lepton-number-violating process decay in $^{100}\mathrm{Mo}$. With more than one year operation ($^{100}\mathrm{Mo}$ exposure $1.17\text{ }\text{...
Abstract The CUPID-Mo experiment to search for 0 $$\nu \beta $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>ν</mml:mi> <mml:mi>β</mml:mi> </mml:mrow> </mml:math> decay in $$^{100}$$ <mml:msup> <mml:mrow /> <mml:mn>100</mml:mn> </mml:msup> Mo has been recently completed after about 1.5 years of operation at Laboratoire Souterrain de Modane (France). It served as a demonstrator CUPID, next generation experiment. was comprised 20 enriched $$\hbox {Li}_{{2}}$$...
The EDELWEISS collaboration reports on the search for Dark Matter (DM) particle interactions via Migdal effect with masses between $32$ MeV$\cdot$c$^{-2}$ to $2$ GeV$\cdot$c$^{-2}$ using a $200$ g cryogenic Ge detector sensitive simultaneously heat and ionization signals operated underground at Laboratoire Souterrain de Modane in France. phonon signal was read out Transition Edge Sensor made of NbSi thin film. biased $66$ V order benefit from Neganov-Trofimov-Luke amplification resulting...
Two series of mesogenic compounds consisting a rigid pyramidal central core and six equal flexible side chains were synthesized their mesomorphic properties studied by calorimetry optical microscopy. The two are: I-hexaalkyloxytribenzocyclononene II-hexaalkanoyloxytribenzocyclononene. In I, enantiotropic mesophases appear for homologues in which the number, n, carbon atoms each chain is or larger than six, while II mesomorphism exhibited all (8- 15). Some these exhibit dimorphism (i.e. I-11...
Microscopical, miscibility and X-ray studies establish the existence of two new mesophases in enantiomers 1 (methyl)-heptyl terephthalidene bis amino cinnamate. In one this do not exhibit a total range; while for second untwisted form observed with racemic mixture has higher temperature range stability than twisted pure enantiomers. Information about structures phases is given comparison made S*C SD phases. Nevertheless location these sequence presently known calamitic yet completely established.
The search for weakly interacting massive particles (WIMPs) by direct detection faces an encroaching background due to coherent neutrino-nucleus scattering. As the sensitivity of these experiments improves, question how best distinguish a dark matter signal from neutrinos will become increasingly important. A proposed method overcoming this so-called 'neutrino floor' is utilize directional signature that both neutrino and induced recoils possess. We show can indeed probe WIMP-nucleon...
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...
CDMS II data from the five-tower runs at Soudan Underground Laboratory were reprocessed with an improved charge-pulse fitting algorithm. Two new analysis techniques to reject surface-event backgrounds applied 612 kg days germanium-detector weakly interacting massive particle (WIMP)-search exposure. An extended was also completed by decreasing 10 keV threshold $\ensuremath{\sim}5\text{ }\text{ }\mathrm{keV}$, increase sensitivity near a WIMP mass of $8\text{ }\mathrm{GeV}/{c}^{2}$. After...