D. A. Dwyer
A5063729240- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Geophysics and Gravity Measurements
- Nuclear Physics and Applications
- Pulsars and Gravitational Waves Research
- Muon and positron interactions and applications
- Nuclear reactor physics and engineering
- Quantum, superfluid, helium dynamics
- Solar and Space Plasma Dynamics
- Cosmology and Gravitation Theories
- Semiconductor Quantum Structures and Devices
- Particle Accelerators and Free-Electron Lasers
- Radioactive contamination and transfer
- Planetary Science and Exploration
- Gamma-ray bursts and supernovae
- Computational Physics and Python Applications
- Advancements in PLL and VCO Technologies
- Analog and Mixed-Signal Circuit Design
- Advanced NMR Techniques and Applications
- Distributed and Parallel Computing Systems
Lawrence Berkeley National Laboratory
2014-2024
Dublin City University
2023
Université de Strasbourg
2020
Centre National de la Recherche Scientifique
2020
Institute of High Energy Physics
2019
California Institute of Technology
2009-2015
Tohoku University
2014
University of California, Berkeley
2004-2014
University of Wisconsin–Madison
2012-2014
University of Illinois Chicago
2002-2003
The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 3,062 new measurements 721 papers, we list, evaluate, average measured properties gauge bosons the recently discovered Higgs boson, leptons, quarks, mesons, baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. All search limits are listed in Summary Tables. also give numerous tables, figures, formulae, reviews...
The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 2,873 new measurements 758 papers, we list, evaluate, average measured properties gauge bosons the recently discovered Higgs boson, leptons, quarks, mesons, baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. Particle search limits are listed in Summary Tables. give numerous tables, figures, formulae, reviews...
Abstract The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 3,324 new measurements 878 papers, we list, evaluate, average measured properties gauge bosons the recently discovered Higgs boson, leptons, quarks, mesons, baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. Particle search limits are listed in Summary Tables. give numerous tables, figures, formulae,...
KamLAND has measured the flux of nu;(e)'s from distant nuclear reactors. We find fewer nu;(e) events than expected standard assumptions about propagation at 99.95% C.L. In a 162 ton.yr exposure ratio observed inverse beta-decay to number without disappearance is 0.611+/-0.085(stat)+/-0.041(syst) for energies >3.4 MeV. context two-flavor neutrino oscillations with CPT invariance, all solutions solar problem except "large mixing angle" region are excluded.
The Daya Bay Reactor Neutrino Experiment has measured a nonzero value for the neutrino mixing angle ${\ensuremath{\theta}}_{13}$ with significance of 5.2 standard deviations. Antineutrinos from six 2.9 $\mathrm{G}{\mathrm{W}}_{\mathrm{th}}$ reactors were detected in antineutrino detectors deployed two near (flux-weighted baseline 470 m and 576 m) one far (1648 underground experimental halls. With $43\text{ }000\text{ }\text{ }\mathrm{ton}--\mathrm{G}{\mathrm{W}}_{\mathrm{th}}--\mathrm{day}$...
We present results of a study neutrino oscillation based on 766 ton-year exposure KamLAND to reactor anti-neutrinos. observe 258 \nuebar\ candidate events with energies above 3.4 MeV compared 365.2 expected in the absence oscillation. Accounting for 17.8 background events, statistical significance \nuebar disappearance is 99.998%. The observed energy spectrum disagrees spectral shape at 99.6% and prefers distortion from effects. A two-neutrino analysis data gives \DeltaMSq =...
The KamLAND experiment has determined a precise value for the neutrino oscillation parameter Deltam21(2) and stringent constraints on theta12. exposure to nuclear reactor antineutrinos is increased almost fourfold over previous results 2.44 x 10(32) proton yr due longer livetime an enlarged fiducial volume. An undistorted nu[over]e energy spectrum now rejected at >5sigma. Analysis of above inverse beta decay threshold, including geoneutrinos, gives best fit...
We present new constraints on the neutrino oscillation parameters $/textyen Delta m^{2}_{21}$, theta_{12}$, and theta_{13}$ from a three-flavor analysis of solar KamLAND data. The data set includes acquired following radiopurity upgrade amounts to total exposure $3.49 \textyen times 10^{32}$ target-proton-year. Under assumption {\textyen it CPT} invariance, two-flavor (/textyen mbox{$\textyen theta_{13} = 0$}) yields best-fit values $\textyen tan^{2} theta_{12} 0.444^{+0.036}_{-0.030}$...
A measurement of the energy dependence antineutrino disappearance at Daya Bay reactor neutrino experiment is reported. Electron antineutrinos (ν¯(e)) from six 2.9 GW(th) reactors were detected with detectors deployed in two near (effective baselines 512 and 561 m) one far (1579 underground experimental halls. Using 217 days data, 41 589 (203 809 92 912) candidates hall (near halls). An improved oscillation amplitude sin(2)2θ(13)=0.090(-0.009)(+0.008) first direct ν¯(e) mass-squared...
We report an improved measurement of the neutrino mixing angle $\theta_{13}$ from Daya Bay Reactor Neutrino Experiment. exclude a zero value for $\sin^22\theta_{13}$ with significance 7.7 standard deviations. Electron antineutrinos six reactors 2.9 GW$_{\rm th}$ were detected in antineutrino detectors deployed two near (flux-weighted baselines 470 m and 576 m) one far (1648 underground experimental halls. Using 139 days data, 28909 (205308) electron candidates at hall (near halls). The ratio...
We report a measurement of electron antineutrino oscillation from the Daya Bay Reactor Neutrino Experiment with nearly 4 million reactor $\overline{\nu}_{e}$ inverse beta decay candidates observed over 1958 days data collection. The installation Flash-ADC readout system and special calibration campaign using different source enclosures reduce uncertainties in absolute energy to less than 0.5% for visible energies larger 2 MeV. uncertainty cosmogenic $^9$Li $^8$He background is reduced 45%...
This Letter reports a measurement of the flux and energy spectrum electron antineutrinos from six 2.9~GW$_{th}$ nuclear reactors with detectors deployed in two near (effective baselines 512~m 561~m) one far (1,579~m) underground experimental halls Daya Bay experiment. Using 217 days data, 296,721 41,589 inverse beta decay (IBD) candidates were detected halls, respectively. The measured IBD yield is (1.55 $\pm$ 0.04) $\times$ 10$^{-18}$~cm$^2$/GW/day or (5.92 0.14) 10$^{-43}$~cm$^2$/fission....
The Daya Bay Collaboration reports precise measurements of the ${\ensuremath{\theta}}_{13}$ neutrino mixing angle and predicts $\mathrm{\ensuremath{\Delta}}\phantom{\rule{0}{0ex}}{m}_{32}^{2}$ mass difference for both normal inverted hierarchy scenarios. These values are based on comparing detection antineutrinos by ''near'' ''far'' detectors more than 2.5 million inverse beta-decay observations.
A new measurement of the reactor antineutrino flux and energy spectrum by Daya Bay neutrino experiment is reported. The antineutrinos were generated six 2.9~GW$_{\mathrm{th}}$ nuclear reactors detected eight detectors deployed in two near (560~m 600~m flux-weighted baselines) one far (1640~m baseline) underground experimental halls. With 621 days data, more than 1.2 million inverse beta decay (IBD) candidates detected. IBD yield was measured, ratio measured to predicted found be...
Recent measurements of the positron energy spectrum obtained from inverse beta decay interactions reactor electron antineutrinos show an excess in 4 to 6 MeV region relative current predictions. First-principles calculations fission and processes within a typical pressurized water core identify prominent daughter isotopes as possible origin for this excess. These also predict percent-level substructures antineutrino due Coulomb effects decay. Precise measurement these can elucidate nuclear...
We present the results of a search for extraterrestrial electron antineutrinos ('s) in energy range using KamLAND detector. In an exposure 4.53 kton-year, we identify 25 candidate events. All events can be attributed to background, most importantly neutral current atmospheric neutrino interactions, setting upper limit on probability 8B solar νe's converting into 's at 5.3 × 10−5 (90% CL), if assume undistorted shape. This corresponds flux 93 cm−2 s−1 or event rate 1.6 (kton − year)−1 above...
Searches for a light sterile neutrino have been performed independently by the MINOS and Daya Bay experiments using muon (anti)neutrino electron antineutrino disappearance channels, respectively. In this Letter, results from both are combined with those Bugey-3 reactor experiment to constrain oscillations into neutrinos. The three sensitive complementary regions of parameter space, enabling analysis probe allowed Liquid Scintillator Neutrino Detector (LSND) MiniBooNE in minimally extended...
Data corresponding to a KamLAND detector exposure of 0.28 kton yr has been used search for nu;(e)'s in the energy range 8.3<E(nu;(e))<14.8 MeV. No candidates were found an expected background 1.1+/-0.4 events. This result can be obtain limit on nu;(e) fluxes any origin. Assuming that all flux its origin Sun and characteristic 8B solar nu(e) spectrum, we upper 3.7 x 10(2) cm(-2) s(-1) (90% C.L.) flux. We interpret this limit, 2.8 10(-4) standard model flux, framework spin-flavor precession...
We report a measurement of the neutrino-electron elastic scattering rate from ${}^{8}$B solar neutrinos based on 123 kton-day exposure KamLAND. The background-subtracted electron recoil rate, above 5.5-MeV analysis threshold is 1.49 $\ifmmode\pm\else\textpm\fi{}$ 0.14(stat) 0.17(syst) events per kton-day. Interpreted as due to pure flavor flux with neutrino spectrum, this corresponds spectrum integrated 2.77 0.26(stat) 0.32(syst) $\ifmmode\times\else\texttimes\fi{}$10${}^{6}$...
Determination of the neutrino mass hierarchy using a reactor experiment at $\sim$60 km is analyzed. Such measurement challenging due to finite detector resolution, absolute energy scale calibration, as well degeneracies caused by current experimental uncertainty $|\Delta m^2_{32}|$. The standard $\chi^2$ method compared with proposed Fourier transformation method. In addition, we show that for such succeed, one must understand non-linearity level few tenths percent.
We report a measurement of the neutrino-electron elastic scattering rate 862 keV 7Be solar neutrinos based on 165.4 kton-day exposure KamLAND. The observed is 582 +/- 90 (kton-day)^-1, which corresponds to neutrino flux (3.26 0.50) x 10^9 cm^-2s^-1, assuming pure electron flavor flux. Comparing this with standard model prediction and further three mixing, nu_e survival probability 0.66 0.14 determined from KamLAND data. Utilizing global oscillation analysis, we obtain total (5.82 0.98)...