N. Abgrall
A5049809018- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- Radioactive contamination and transfer
- Muon and positron interactions and applications
- Radioactivity and Radon Measurements
- Geophysical Methods and Applications
- Radio Astronomy Observations and Technology
- Superconducting Materials and Applications
- International Science and Diplomacy
- Nuclear physics research studies
- Education in Diverse Contexts
- Cosmology and Gravitation Theories
- Digital Radiography and Breast Imaging
- Spacecraft and Cryogenic Technologies
- Global Socioeconomic and Political Dynamics
- Superconducting and THz Device Technology
- Atomic and Subatomic Physics Research
Lawrence Berkeley National Laboratory
2014-2024
University of Geneva
2007-2024
Campbell Collaboration
2021
Shanghai Jiao Tong University
2016
University of North Carolina at Chapel Hill
2013
Triangle Universities Nuclear Laboratory
2013
Oak Ridge National Laboratory
2013
The T2K experiment observes indications of ν(μ) → ν(e) appearance in data accumulated with 1.43×10(20) protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario |Δm(23)(2)| = 2.4×10(-3) eV(2), sin(2)2θ(23) 1 and sin(2)2θ(13) 0, expected number such is 1.5±0.3(syst). Under this hypothesis, probability to observe six or more candidate 7×10(-3), equivalent 2.5σ significance. At 90% C.L., are consistent 0.03(0.04) < 0.28(0.34)...
The T2K experiment is a long baseline neutrino oscillation experiment. Its main goal to measure the last unknown lepton sector mixing angle θ13 by observing νe appearance in νμ beam. It also aims make precision measurement of known parameters, Δm232 and sin22θ23, via disappearance studies. Other goals include various cross-section measurements sterile searches. uses an intense proton beam generated J-PARC accelerator Tokai, Japan, composed beamline, near detector complex (ND280), far...
The M ajorana D emonstrator will search for the neutrinoless double-beta<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mo stretchy="false">(</mml:mo><mml:mi>β</mml:mi><mml:mi>β</mml:mi><mml:mfenced separators="|"><mml:mrow><mml:mn fontstyle="italic">0</mml:mn><mml:mi>ν</mml:mi></mml:mrow></mml:mfenced><mml:mo stretchy="false">)</mml:mo></mml:math>decay of isotope<mml:math id="M2"/>Ge with a mixed array enriched and natural germanium detectors. observation this rare...
The Tokai-to-Kamioka (T2K) experiment studies neutrino oscillations using an off-axis muon beam with a peak energy of about 0.6 GeV that originates at the J-PARC accelerator facility. Interactions neutrinos are observed near detectors placed 280 m from production target and far detector -- Super-Kamiokande (SK) located 295 km away. flux prediction is essential part successful interaction rates T2K important input to oscillation cross section measurements. A FLUKA GEANT3 based simulation...
The observation of neutrinoless double-beta decay (0${\nu}{\beta}{\beta}$) would show that lepton number is violated, reveal neutrinos are Majorana particles, and provide information on neutrino mass. A discovery-capable experiment covering the inverted ordering region, with effective masses 15 - 50 meV, will require a tonne-scale excellent energy resolution extremely low backgrounds, at level $\sim$0.1 count /(FWHM$\cdot$t$\cdot$yr) in region signal. current generation $^{76}$Ge experiments...
The Majorana Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-β decay in ^{76}Ge. Demonstrator comprises 44.1 kg (29.7 enriched ^{76}Ge) split between two modules contained a low background shield at the Sanford Underground Research Facility Lead, South Dakota. Here we present results from data taken during construction, commissioning, and start full operations. We achieve unprecedented energy resolution 2.5 keV FWHM Q_{ββ} very with no...
Interaction cross sections and charged pion spectra in p+C interactions at 31 GeV/c were measured with the large acceptance NA61/SHINE spectrometer CERN SPS. These data are required to improve predictions of neutrino flux for T2K long baseline oscillation experiment Japan. A set collected during first run 2007 an isotropic graphite target a thickness 4% nuclear interaction length was used analysis. The inelastic production 257.2 +- 1.9 8.9 mb 229.3 9.0 mb, respectively. Inclusive negatively...
The T2K collaboration: reports evidence for electron neutrino appearance at the atmospheric mass splitting, |\Delta m_{32}^2|=2.4x10^{-3} eV^2. An excess of interactions over background is observed from a muon beam with peak energy 0.6 GeV Super-Kamiokande (SK) detector 295 km beam's origin. Signal and predictions are constrained by data near detectors located 280 m production target. We observe 11 candidate events SK when 3.3\pm0.4(syst.) expected. background-only hypothesis rejected...
NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) is a multi-purpose experimental facility to study hadron production in hadron-proton, hadron-nucleus nucleus-nucleus collisions at the CERN Super Proton Synchrotron. It recorded first physics data with beams 2009 ion (secondary 7Be beams) 2011. has greatly profited from long development of proton sources accelerator chain as well H2 beamline North Area. The latter recently been modified also serve fragment separator needed produce Be for...
T2K has performed the first measurement of ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ inclusive charged current interactions on carbon at neutrino energies $\ensuremath{\sim}1\text{ }\text{ }\mathrm{GeV}$ where is reported as a flux-averaged double differential cross section in muon momentum and angle. The flux predicted by beam Monte Carlo external data, including results from NA61/SHINE experiment. data used for this were taken 2010 2011, with total...
Measurements of hadron production in p + C interactions at 31 GeV/c are performed using the NA61/SHINE spectrometer CERN SPS. The analysis is based on full set data collected 2009 a graphite target with thickness 4 % nuclear interaction length. Inelastic and cross sections as well spectra $$\pi ^{\pm }$$ , $$K^{\pm p, $$K^0_S$$ $$\varLambda $$ measured high precision. These measurements essential for improved calculations initial neutrino fluxes T2K long-baseline oscillation experiment...
We report a measurement of muon-neutrino disappearance in the T2K experiment. The 295-km beam from Tokai to Kamioka is first implementation off-axis technique long-baseline neutrino oscillation With data corresponding $1.43\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on target, we observe 31 fully-contained single $\ensuremath{\mu}$-like ring events Super-Kamiokande, compared with an expectation $104\ifmmode\pm\else\textpm\fi{}14\text{ }(\mathrm{syst})$ without oscillations. best-fit...
Spectra of positively charged kaons in p+C interactions at 31 GeV/c were measured with the NA61/SHINE spectrometer CERN SPS. The analysis is based on full set data collected 2007 a graphite target thickness 4% nuclear interaction length. Interaction cross sections and pion spectra already using same data. These new measurements combination published ones are required to improve predictions neutrino flux for T2K long baseline oscillation experiment Japan. In particular, knowledge kaon...
We present new limits on exotic keV-scale physics based 478 kg d of Majorana Demonstrator commissioning data. Constraints at the 90% confidence level are derived bosonic dark matter (DM) and solar axion couplings, Pauli exclusion principle violating (PEPV) decay, electron decay using monoenergetic peak signal above our background. Our most stringent DM constraints set for 11.8 keV mass particles, limiting g_{Ae}<4.5×10^{-13} pseudoscalars (α^{'}/α)<9.7×10^{-28} vectors. also report a 14.4...
We present experimental results on inclusive spectra and mean multiplicities of negatively charged pions produced in inelastic p+p interactions at incident projectile momenta 20, 31, 40, 80 158 GeV/c ( $$\sqrt{s} = $$ 6.3, 7.7, 8.8, 12.3 17.3 GeV, respectively). The measurements were performed using the large acceptance NA61/SHINE hadron spectrometer CERN super proton synchrotron. Two-dimensional are determined terms rapidity transverse momentum. Their properties such as width distributions...
Background: The MAJORANA DEMONSTRATOR , a modular array of isotopically enriched high-purity germanium (HPGe) detectors, was constructed to demonstrate backgrounds low enough justify building tonne-scale experiment search for the neutrinoless double-beta decay ($\beta\beta(0\nu)$) $^{76}\mathrm{Ge}$. Purpose: This paper presents description instrument, its commissioning, and operations. It covers electroforming, underground infrastructure, enrichment, detector fabrication, low-background...
Received 22 January 2013DOI:https://doi.org/10.1103/PhysRevD.87.019902© 2013 American Physical Society
Measurements of particle emission from a replica the T2K 90 cm-long carbon target were performed in NA61/SHINE experiment at CERN SPS, using data collected during high-statistics run 2009. An efficient use long-target measurements for neutrino flux predictions requires dedicated reconstruction and analysis techniques. Fully-corrected differential yields $$\pi ^\pm $$ -mesons surface incoming 31 GeV/c protons are presented. A possible strategy to implement these results into beam is discussed...
Measurements of the $\pi^{\pm}$, $K^{\pm}$, and proton double differential yields emitted from surface 90-cm-long carbon target (T2K replica) were performed for incoming 31 GeV/c protons with NA61/SHINE spectrometer at CERN SPS using data collected during 2010 run. The $\pi^{\pm}$ measured increased precision compared to previously published results, while $K^{\pm}$ obtained first time. A strategy dealing dependence results on beam profile is proposed. purpose these measurements reduce...
Spectra of K0S mesons and Lambda hyperons were measured in p+C interactions at 31 GeV/c with the large acceptance NA61/SHINE spectrometer CERN SPS. The data collected an isotropic graphite target a thickness 4% nuclear interaction length. Interaction cross sections, charged pion spectra, kaon spectra previously using same set. Results on production serve as reference for understanding enhancement strangeness nucleus-nucleus collisions. Moreover, they provide important input improvement...
The MAJORANA DEMONSTRATOR is an array of point-contact Ge detectors fabricated from isotopically enriched to 88% in Ge-76 search for neutrinoless double beta decay. processing germanium a well-known technology. However, because the high cost Ge-76, special procedures were required maximize yield detector mass and minimize exposure cosmic rays. These include careful accounting material; shielding it reduce cosmogenic generation radioactive isotopes; development reprocessing techniques...