A. Hatzikoutelis
A5076742267- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Planetary Science and Exploration
- Quantum, superfluid, helium dynamics
- Pulsars and Gravitational Waves Research
- High-Energy Particle Collisions Research
- Noncommutative and Quantum Gravity Theories
- Nuclear physics research studies
- Scientific Research and Discoveries
- Muon and positron interactions and applications
- Distributed and Parallel Computing Systems
- History and Developments in Astronomy
- Particle Accelerators and Free-Electron Lasers
- Nuclear reactor physics and engineering
- Quantum Chromodynamics and Particle Interactions
- Quantum Mechanics and Applications
- Magnetic confinement fusion research
- Photocathodes and Microchannel Plates
- Spectroscopy and Quantum Chemical Studies
- Cosmology and Gravitation Theories
University of Tennessee at Knoxville
2013-2023
San Jose State University
2019-2023
Lancaster University
2008-2022
Czech Technical University in Prague
2017
Fermi National Accelerator Laboratory
2017
Southern Methodist University
2017
University of Alberta
2011
National Centre for Nuclear Research
2011
Institute of Particle Physics
2011
Virginia Tech
2006
The Double Chooz experiment presents an indication of reactor electron antineutrino disappearance consistent with neutrino oscillations. An observed-to-predicted ratio events 0.944±0.016(stat)±0.040(syst) was obtained in 101 days running at the nuclear power plant France, two 4.25 GW(th) reactors. results were from a single 10 m(3) fiducial volume detector located 1050 m cores. flux prediction used Bugey4 measurement after correction for differences core composition. deficit can be...
The Double Chooz experiment has observed 8249 candidate electron antineutrino events in 227.93 live days with 33.71 GW-ton-years ($\mathrm{\text{reactor power}}\ifmmode\times\else\texttimes\fi{}\mathrm{\text{detector mass}}\ifmmode\times\else\texttimes\fi{}\mathrm{\text{live time}}$) exposure using a $10.3\text{ }\text{ }{\mathrm{m}}^{3}$ fiducial volume detector located at 1050 m from the reactor cores of nuclear power plant France. expectation case ${\ensuremath{\theta}}_{13}=0$ is 8937...
The NOvA experiment has made a $4.4\sigma$-significant observation of $\bar\nu_{e}$ appearance in 2 GeV $\bar\nu_{\mu}$ beam at distance 810 km. Using $12.33\times10^{20}$ protons on target delivered to the Fermilab NuMI neutrino beamline, recorded 27 $\bar\nu_{\mu} \rightarrow \bar\nu_{e}$ candidates with background 10.3 and 102 \bar\nu_{\mu}$ candidates. This new antineutrino data is combined measure oscillation parameters $|\Delta m^2_{32}| = 2.48^{+0.11}_{-0.06}\times10^{-3}$ eV$^2/c^4$,...
We report results from the first search for νμ→νe transitions by NOvA experiment. In an exposure equivalent to 2.74×1020 protons on target in upgraded NuMI beam at Fermilab, we observe 6 events Far Detector, compared a background expectation of 0.99±0.11(syst) based Near Detector measurement. A secondary analysis observes 11 with 1.07±0.14(syst). The 3.3σ excess observed primary disfavors 0.1π<δCP<0.5π inverted mass hierarchy 90% C.L.Received 19 January...
We present updated results from the NOvA experiment for $\nu_\mu\rightarrow\nu_\mu$ and $\nu_\mu\rightarrow\nu_e$ oscillations an exposure of $8.85\times10^{20}$ protons on target, which represents increase 46% compared to our previous publication. The utilize significant improvements in both simulations analysis data. A joint fit data $\nu_\mu$ disappearance $\nu_e$ appearance gives best point as normal mass hierarchy, $\Delta m^2_{32} = 2.44\times 10^{-3}{{\rm eV}^2}/c^4$,...
Abstract The existence of nonzero neutrino masses points to the likely multiple Standard Model neutral fermions. When such states are heavy enough that they cannot be produced in oscillations, referred as leptons (HNLs). In this white paper, we discuss present experimental status HNLs including colliders, beta decay, accelerators, well astrophysical and cosmological impacts. We importance continuing search for HNLs, its potential impact on our understanding key fundamental questions,...
Dark sectors, consisting of new, light, weakly-coupled particles that do not interact with the known strong, weak, or electromagnetic forces, are a particularly compelling possibility for new physics. Nature may contain numerous dark each their own beautiful structure, distinct particles, and forces. This review summarizes physics motivation sectors exciting opportunities experimental exploration. It is summary Intensity Frontier subgroup "New, Light, Weakly-coupled Particles" Community...
Using a muon neutrino source at Fermilab, the NOvA collaboration has measured disappearance and electron appearance, strengthening constraints on $C\phantom{\rule{0}{0ex}}P$-violating phase in inverted-neutrino-mass-hierarchy case.
This paper reports the first measurement using NOvA detectors of ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ disappearance in a beam. The analysis uses 14 kton-equivalent exposure $2.74\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons-on-target from Fermilab NuMI Assuming normal neutrino mass hierarchy, we measure $\mathrm{\ensuremath{\Delta}}{m}_{32}^{2}=({2.52}_{\ensuremath{-}0.18}^{+0.20})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}\text{ }\text{ }{\mathrm{eV}}^{2}$ and...
This Letter reports new results on muon neutrino disappearance from NOvA, using a 14 kton detector equivalent exposure of $6.05\times10^{20}$ protons-on-target the NuMI beam at Fermi National Accelerator Laboratory. The measurement probes muon-tau symmetry hypothesis that requires maximal mixing ($\theta_{23} = \pi/4$). Assuming normal mass hierarchy, we find $\Delta m^2 (2.67 \pm 0.11)\times 10^{-3}$ eV$^2$ and $\sin^2 \theta_{23}$ two statistically degenerate values...
With the advent of a new generation neutrino experiments which leverage high-intensity beams for precision measurements, it is timely to explore physics topics beyond standard neutrino-related physics. Given that realm model (BSM) has been mostly sought at high-energy regimes colliders, such as LHC CERN, exploration BSM in will enable complementary measurements energy balance LHC. This concert with ideas fixed target and beam-dump world-wide, e.g., those CERN. The combination high intensity...
We report results from the first search for sterile neutrinos mixing with active through a reduction in rate of neutral-current interactions over baseline 810\,km between NOvA detectors. Analyzing 14-kton detector equivalent exposure 6.05$\times$10$^{20}$ protons-on-target NuMI beam at Fermilab, we observe 95 candidates Far Detector compared $83.5 \pm 9.7 \mbox{(stat.)} 9.4 \mbox{(syst.)}$ events predicted assuming only occurs neutrino species. No evidence $\nu_{\mu} \rightarrow \nu_{s}$...
The T2K experiment studies oscillations of an off-axis muon neutrino beam between the J-PARC accelerator complex and Super-Kamiokande detector. Special emphasis is placed on measuring mixing angle theta_13 by observing electron appearance via sub-dominant to oscillation, searching for CP violation in lepton sector. includes a sophisticated, off-axis, near detector, ND280, situated 280 m downstream production target order measure properties understand better interactions at energy scale below...
We present a search for Lorentz violation with 8249 candidate electron antineutrino events taken by the Double Chooz experiment in 227.9 live days of running. This analysis, featuring sidereal time dependence events, is first test invariance using reactor-based source. No variation data and disappearance results are consistent independent oscillations. Under Standard-Model Extension, we set limits on 14 violating coefficients associated transitions between tau flavor, two competitive muon flavor.
Abstract The two-detector design of the NOvA neutrino oscillation experiment, in which two functionally identical detectors are exposed to an intense beam, aids canceling leading order effects cross-section uncertainties. However, limited knowledge interaction cross sections still gives rise some largest systematic uncertainties current measurements. We show contemporary models interactions be discrepant with data from NOvA, consistent discrepancies seen other experiments. Adjustments GENIE...
In a detailed investigation of giant dipole resonance (GDR) \ensuremath{\gamma}-ray yield from the ${}^{16}{\mathrm{O}+}^{208}\mathrm{Pb}$ system, absolute \ensuremath{\gamma}-ray/fission multiplicities are extracted and reported over wide range excitation energy angular momentum. The enhanced GDR decay \ensuremath{\gamma} rays compound system has been analyzed within framework modified statistical model containing nuclear viscosity as free parameter. parameter studied much wider momentum...
Part 2 of "Project X: Accelerator Reference Design, Physics Opportunities, Broader Impacts". In this Part, we outline the particle-physics program that can be achieved with Project X, a staged superconducting linac for intensity-frontier particle physics. Topics include neutrino physics, kaon muon electric dipole moments, neutron-antineutron oscillations, new light particles, hadron structure, spectroscopy, and lattice-QCD calculations. 1 is available as arXiv:1306.5022 [physics.acc-ph] 3...
Double Chooz is unique among modern reactor-based neutrino experiments studying $\bar \nu_e$ disappearance in that data can be collected with all reactors off. In this paper, we present from 7.53 days of reactor-off running. Applying the same selection criteria as used reactor-on oscillation analysis, a measured background rate 1.0$\pm$0.4 events/day obtained. The model for accidentals, cosmogenic $\beta$-$n$-emitting isotopes, fast neutrons cosmic muons, and stopped-$\mu$ decays analysis...
The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory, Tennessee, provides an intense flux of neutrinos in the few tens-of-MeV range, with a sharply-pulsed timing structure that is beneficial for background rejection. In this document, product workshop SNS May 2012, we describe free, high-quality stopped-pion neutrino source and outline various physics could be done using it. We without prioritization some specific experimental configurations address these topics.
The NOvA long-baseline neutrino experiment uses a pair of large, segmented, liquid-scintillator calorimeters to study oscillations, using GeV-scale neutrinos from the Fermilab NuMI beam. These detectors are also sensitive flux which emitted during core-collapse supernova through inverse beta decay interactions on carbon at energies $\mathcal{O}(10~\text{MeV})$. This signature provides means dominant mode energy release for occurring in our galaxy. We describe data-driven software trigger...
The cross section of neutrino-induced neutral-current coherent ${\ensuremath{\pi}}^{0}$ production on a carbon-dominated target is measured in the NOvA near detector. This measurement uses narrow-band neutrino beam with an average energy 2.7 GeV, which interest to ongoing and future long-baseline oscillation experiments. measured, flux-averaged...
Using two years of data from the NOvA Near Detector at Fermilab, we report a seasonal variation cosmic ray induced multiple-muon event rates which has an opposite phase to in atmospheric temperature. The strength multipl$ increase as function muon multiplicity. However, no significant dependence is seen zenith angle, or spatial angular separation between correlated muons.
The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory, Tennessee, provides an intense flux of neutrinos in the few tens-of-MeV range, with a sharply-pulsed timing structure that is beneficial for background rejection. In this white paper, we describe how SNS source can be used measurement coherent elastic neutrino-nucleus scattering (CENNS), and physics reach different phases such experimental program (CSI: Coherent Scattering Investigations SNS).