A5100426717- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Nuclear Physics and Applications
- Planetary Science and Exploration
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- Quantum, superfluid, helium dynamics
- Eating Disorders and Behaviors
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Gamma-ray bursts and supernovae
- Obesity, Physical Activity, Diet
- Obesity and Health Practices
- Nuclear reactor physics and engineering
- Nuclear physics research studies
- Art, Politics, and Modernism
- Advanced Vision and Imaging
University of California System
2025
University of California, Davis
2024-2025
University of California, Irvine
2023-2024
Fermi National Accelerator Laboratory
2021-2024
UC Irvine Health
2023-2024
Shandong University
2024
Colorado State University
2017-2023
University of Bern
2023
Albert Einstein College of Medicine
2023
Eötvös Loránd University
2023
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%...
We identify a largely model-independent signature of dark matter interactions with nucleons and electrons. Dark in the local galactic halo, gravitationally accelerated to over half speed light, scatters against deposits kinetic energy into neutron stars, heating them infrared blackbody temperatures. The resulting radiation could potentially be detected by James Webb Space Telescope, Thirty Meter or European Extremely Large Telescope. This mechanism also produces optical emission from stars...
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.
We show that the Deep Underground Neutrino Experiment (DUNE), with significant but feasible new efforts, has potential to deliver world-leading results in solar neutrinos. With a 100 kton-year exposure, DUNE could detect $\gtrsim 10^5$ signal events above 5 MeV electron energy. Separate precision measurements of neutrino-mixing parameters and $^8$B flux be made using two detection channels ($\nu_e + \, ^{40}$Ar $\nu_{e,\mu,\tau} e^-$) day-night effect ($> 10 \sigma$). New particle physics...
Observations by HAWC and Milagro have detected bright spatially extended TeV gamma-ray sources surrounding the Geminga Monogem pulsars. We argue that these observations, along with a substantial population of other coincident pulsar wind nebulae, constitute new morphological class halos. show HAWCs wide field-of-view unlocks an expansive parameter space halos not observable atmospheric Cherenkov telescopes. Under assumption are typical middle-aged pulsars, we ten-year observations should...
This report summarizes the present status of neutrino non-standard interactions (NSI). After a brief overview, several aspects NSIs are discussed, including connection to mass models, model-building and phenomenology large NSI with both light heavy mediators, in short- long-baseline oscillation experiments, cross-sections, complementarity other low- high-energy fits scattering data, DUNE sensitivity NSI, effective field theory as well relevance dark matter cosmology. We also discuss open...
Abstract We critically examine the ability of future neutrino telescopes, including Baikal-GVD, KM3NeT, P-ONE, TAMBO, and IceCube-Gen2, to determine flavor composition high-energy astrophysical neutrinos in light data from next-generation oscillation experiments JUNO, DUNE, Hyper-Kamiokande. By 2040, region allowed at Earth will shrink ten-fold, sources be inferred within 6%, enough pinpoint dominant production mechanism identify possible sub-dominant mechanisms. These conclusions hold even...
In this theoretical study of successful core-collapse supernovae, the authors provide a detailed model neutrino emission from different phases transition - explosion to proto-neutron star cooling late-time formation either neutron or black hole. They show that for supernova in Milky Way, these copiously produced neutrinos can be detected by current neutrino-detection experiments and used extract information about course event. The offers highly promising program make full use rare event as...
The next Milky Way supernova will be an epochal event in multimessenger astronomy, critical to tests of supernovae, neutrinos, and new physics. Realizing this potential depends on having realistic simulations core collapse. We investigate the neutrino predictions modern models (1-, 2-, 3-D) over first $\ensuremath{\simeq}1\text{ }\text{ }\mathrm{s}$, making detailed comparisons these each other SN 1987A data. Even with different methods inputs, generally agree other. However, even...
Abstract Maximizing the discovery potential of increasingly precise neutrino experiments will require an improved theoretical understanding neutrino-nucleus cross sections over a wide range energies. Low-energy interactions are needed to reconstruct energies astrophysical neutrinos from supernovae bursts and search for new physics using measurement coherent elastic scattering. Higher-energy involve variety reaction mechanisms including quasi-elastic scattering, resonance production, deep...
Available estimates for the energy resolution of DUNE vary by as much a factor four. To address this controversy, and to connect underlying physical processes, we build an independent simulation pipeline neutrino events in liquid argon, combining public tools GENIE FLUKA. Using pipeline, first characterize channels non-hermeticity DUNE, including subthreshold particles, charge recombination, nuclear breakup. Particular attention is paid role neutrons, which are responsible large fraction...
A bstract The unitarity of the lepton mixing matrix is a critical assumption underlying standard neutrino-mixing paradigm. However, many models seeking to explain as-yet-unknown origin neutrino masses predict deviations from in active states. Motivated by prospect that future experiments may provide precise measurement matrix, we revisit current constraints on violation oscillation measurements and project how next-generation will improve our knowledge. With data, normalizations all rows...
When muons travel through matter, their energy losses lead to nuclear breakup ("spallation") processes. The delayed decays of unstable daughter nuclei produced by cosmic-ray are important backgrounds for low-energy astrophysical neutrino experiments, e.g., those seeking detect solar or Diffuse Supernova Neutrino Background (DSNB) signals. Even though Super-Kamiokande has strong general cuts reduce these spallation-induced backgrounds, the remaining rate before additional specific signals is...
The Deep Underground Neutrino Experiment (DUNE) could be revolutionary for MeV neutrino astrophysics, because of its huge detector volume, unique event reconstruction capabilities, and excellent sensitivity to the ${\ensuremath{\nu}}_{e}$ flavor. However, backgrounds are not yet known. A major background is expected due muon spallation argon, which produces unstable isotopes that later $\ensuremath{\beta}$ decay. We present first comprehensive study in detailing isotope production mechanisms...
Light, weakly coupled dark sectors may be naturally decoupled in the early Universe and enter equilibrium with Standard Model bath during epoch of primordial nucleosynthesis. The equilibration eventual decoupling sector states modifies expansion rate Universe, which alters predicted abundances light elements. This effect can encompassed a time-varying contribution to ${N}_{\mathrm{eff}}$, effective number neutrino species, such that ${N}_{\mathrm{eff}}$ nucleosynthesis differs from its...
Crucial questions about solar and supernova neutrinos remain unanswered. Super-Kamiokande has the exposure needed for progress, but detector backgrounds are a limiting factor. A leading component is beta decays of isotopes produced by cosmic-ray muons their secondaries, which initiate nuclear spallation reactions. Cuts events after surrounding muon tracks reduce this decay background $\ensuremath{\simeq} 90%$ (at cost 20%$ deadtime), its rate at 6--18 MeV still dominant. better way to cut...
This work reports a precise measurement of the reactor antineutrino flux using 2.2 million inverse beta decay (IBD) events collected with Daya Bay near detectors in 1230 days. The dominant uncertainty on neutron detection efficiency is reduced by 56% respect to previous through comprehensive calibration and detailed data simulation analysis. new average IBD yield determined be $(5.91\ifmmode\pm\else\textpm\fi{}0.09)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}43}\text{ }\text{...
Gauge theory correlators are potentially more singular in the infrared than those non-gauge theories. We determine implications that these singularities have on spectrum of theory, proving appearance generalised poles implies existence on-shell states with fixed mass, but zero norm. For quantum chromodynamics direct relevance for confinement coloured states. Using lattice data Landau gauge gluon propagator we subsequently test presence poles, establishing is indeed consistent such a component.
Cosmic-ray muons and especially their secondaries break apart nuclei ("spallation") produce fast neutrons beta-decay isotopes, which are backgrounds for low-energy experiments. In Super-Kamiokande, these beta decays the dominant background in 6--18 MeV, relevant solar neutrinos diffuse supernova neutrino background. a previous paper, we showed that spallation isotopes produced primarily showers, instead of isolation. This explains an empirical spatial correlation between peak muon Cherenkov...
The flavor composition of high-energy astrophysical neutrinos is a rich observable. However, present analyses cannot effectively distinguish particle showers induced by ν_{e} vs ν_{τ}. We show that this can be accomplished measuring the intensities delayed, collective light emission from muon decays and neutron captures, which are, on average, greater for ν_{τ} than ν_{e}. This new technique would significantly improve tests nature sources neutrino properties. discuss promising prospects...
KM3NET has reported the detection of a remarkably high-energy through-going muon. Lighting up about third detector, this muon could originate from neutrino exceeding 10 PeV energy. The crucial question we need to answer is where event comes and what its source is. Intriguingly, IceCube been running with much larger effective area for longer time, yet it not neutrinos above PeV. We quantify tension between KM3NeT absence similar events in IceCube. Through detailed analysis, determine most...
We present a comprehensive analysis of leptonic unitarity triangles, using both current neutrino oscillation data and projections next-generation measurements. Future experiments, sensitive to the degree CP violation in lepton sector, will enable construction precise triangles. show how could manifest triangles discuss they serve as tests. also propose use Jarlskog factors complementary means probing unitarity. This highlights importance testing mixing matrix, an understanding which is...