V. Veeraraghavan
A5114378111- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Computational Physics and Python Applications
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Distributed and Parallel Computing Systems
- Structural Analysis of Composite Materials
- Atmospheric Ozone and Climate
- Nuclear reactor physics and engineering
- Particle Accelerators and Free-Electron Lasers
- Relativity and Gravitational Theory
- Engineering and Materials Science Studies
- Photocathodes and Microchannel Plates
- Industrial Vision Systems and Defect Detection
- Microfluidic and Capillary Electrophoresis Applications
- Islamic Thought and Society Studies
- Eurasian Exchange Networks
- Big Data Technologies and Applications
University of Arizona
2016-2023
University of Alabama
2018-2023
Iowa State University
2022-2023
Florida State University
2010-2022
Brookhaven National Laboratory
2021
Kurchatov Institute
2019-2020
Institute for Theoretical and Experimental Physics
2019-2020
The University of Adelaide
2016-2018
Azerbaijan National Academy of Sciences
2016-2018
Stanford University
2018
A search for neutrinoless double-beta decay ($0\nu\beta\beta$) in $^{136}$Xe is performed with the full EXO-200 dataset using a deep neural network to discriminate between $0\nu\beta\beta$ and background events. Relative previous analyses, signal detection efficiency has been raised from 80.8% 96.4$\pm$3.0% energy resolution of detector at Q-value improved $\sigma/E=1.23\%$ $1.15\pm0.02\%$ upgraded detector. Accounting new data, median 90% confidence level half-life sensitivity this analysis...
The projected performance and detector configuration of nEXO are described in this pre-Conceptual Design Report (pCDR). is a tonne-scale neutrinoless double beta ($0νββ$) decay search $^{136}$Xe, based on the ultra-low background liquid xenon technology validated by EXO-200. With $\simeq$ 5000 kg enriched to 90% isotope 136, has half-life sensitivity approximately $10^{28}$ years. This represents an improvement about two orders magnitude with respect current results. Based experience gained...
We apply deep neural networks (DNN) to data from the EXO-200 experiment. In studied cases, DNN is able reconstruct relevant parameters—total energy and position—directly raw digitized waveforms, with minimal exceptions. For first time, developed algorithms are evaluated on real detector calibration data. The accuracy of reconstruction either reaches or exceeds what was achieved by conventional approaches over course Most existing event classification in particle physics trained Monte Carlo...
EOS is a technology demonstrator, designed to explore the capabilities of hybrid event detection technology, leveraging both Cherenkov and scintillation light simultaneously. With fiducial mass four tons, operate in high-precision regime, with sufficient size utilize time-of-flight information for full reconstruction, flexibility demonstrate range cutting edge technologies, simplicity design facilitate potential future deployment at alternative sites. Results from can inform neutrino...
Liquid xenon (LXe) is employed in a number of current and future detectors for rare event searches. We use the EXO-200 experimental data to measure absolute scintillation ionization yields generated by $\ensuremath{\gamma}$ interactions from $^{228}\mathrm{Th}$ (2615 keV), $^{226}\mathrm{Ra}$ (1764 $^{60}\mathrm{Co}$ (1332 keV 1173 keV) calibration sources, over range electric fields. The $W$ value that defines recombination-independent energy scale measured be...
We present a search for electron-recoil signatures from the charged-current absorption of fermionic dark matter using EXO-200 detector. report an average background rate $6.8\ifmmode\times\else\texttimes\fi{}{10}^{4}\text{ }\text{ }\mathrm{cts}\text{ }{\mathrm{kg}}^{\ensuremath{-}1}\text{ }{\mathrm{yr}}^{\ensuremath{-}1}\text{ }{\mathrm{keV}}^{\ensuremath{-}1}$ above 4 MeV and find no statistically significant excess over our projection. Using total $^{136}\mathrm{Xe}$ exposure 234.1 kg yr,...
A search for Majoron-emitting modes of the neutrinoless double-beta decay $^{136}$Xe is performed with full EXO-200 dataset. This dataset consists a total exposure 234.1 kg$\cdot$yr, and includes data detector upgrades that have improved energy threshold relative to previous searches. lower limit T$_{1/2}^{\rm{^{136}Xe}}>$4.3$\cdot$10$^{24}$ yr at 90\% C.L. on half-life spectral index $n=1$ Majoron was obtained, factor 3.6 more stringent than from EXO-200, corresponding constraint...
Generative Adversarial Networks trained on samples of simulated or actual events have been proposed as a way generating large datasets at reduced computational cost. In this work, novel approach to perform the simulation photodetector signals from time projection chamber EXO-200 experiment is demonstrated. The method based Wasserstein Network - deep learning technique allowing for implicit non-parametric estimation population distribution given set objects. Our network real calibration data...
We report on a comparison between the theoretically predicted and experimentally measured spectra of first-forbidden nonunique β-decay transition 137Xe(7/2−)→137Cs(7/2+). The experimental data were acquired by EXO-200 experiment during deployment an AmBe neutron source. ultralow background environment EXO-200, together with dedicated source analysis procedures, allowed for collection pure sample decays, estimated signal to ratio more than 99 1 in energy range from 1075 4175 keV. In addition...
Abstract A new search for two-neutrino double-beta (2 νββ ) decay of 136 Xe to the excited state Ba is performed with full EXO-200 dataset. deep learning-based convolutional neural network used discriminate signal from background events. Signal detection efficiency increased relative previous searches by more than a factor two. With addition Phase II dataset taken an upgraded detector, median 90% confidence level half-life sensitivity 2 yr using total exposure 234.1 kg yr. No statistically...
Reports on the microfabrication of liquid core waveguides (LCW) using Teflon/sup /spl reg// AF for integration in microfabricated micro total analysis systems. has an index refraction less than that water. Straight channels (/spl les/500 mu/m width, les/100 depth) etched into a Pyrex wafer were coated with Teflon and sealed capping wafer. This formed low channel which higher index, aqueous solution was flowed. Light generated lumen propagated by internal reflection (TIR) to end where light...
On behalf of the ATLAS CollaborationWe present a search for direct production pairs top squarks, each decaying into band an squark through R-parity violating couplings.The analysis uses 3.2 fb -1 proton-proton collision data recorded at √ s = 13 TeV by experiment LHC in 2015.Four jets, two which are b-tagged, selected and paired according to their angular separation.Signal regions defined imposing requirements on masses resonance candidates distribution.The average mass resonances is then...
We present a search for electron-recoil signatures from the charged-current absorption of fermionic dark matter using EXO-200 detector. report an average electron recoil background rate $6.8 \times 10^{-4}\, \mathrm{cts}\,\mathrm{kg}^{-1}\mathrm{yr}^{-1}\mathrm{keV}^{-1}$ above $4\,\mathrm{MeV}$ and find no statistically significant excess over our projection. Using total ${}^{136}\mathrm{Xe}$ exposure $234.1\,\mathrm{kg}\,\mathrm{yr}$ we exclude new parameter space cross-section masses...
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