A5037712736- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Distributed and Parallel Computing Systems
- Medical Imaging Techniques and Applications
- Advanced Data Storage Technologies
- CCD and CMOS Imaging Sensors
- Quantum, superfluid, helium dynamics
- Muon and positron interactions and applications
- advanced mathematical theories
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Nuclear physics research studies
- Laser-Plasma Interactions and Diagnostics
- Radiation Effects in Electronics
- Advanced X-ray Imaging Techniques
Carleton University
2016-2025
Rutherford Appleton Laboratory
2009-2024
Federación Española de Enfermedades Raras
2024
TRIUMF
2017-2024
New York University
2024
Atlas Scientific (United States)
2024
A. Alikhanyan National Laboratory
2024
SR Research (Canada)
2024
Simon Fraser University
2024
The University of Adelaide
2014-2023
A signal of $106\ifmmode\pm\else\textpm\fi{}14$ positrons above background has been observed in collisions a low-emittance 46.6 GeV electron beam with terawatt pulses from Nd:glass laser at 527 nm wavelength an experiment the Final Focus Test Beam SLAC. The are interpreted as arising two-step process which photons backscattered to energies by followed collision between high-energy photon and several produce electron-positron pair. These results first laboratory evidence for inelastic...
We report on measurements of quantum electrodynamic processes in an intense electromagnetic wave, where nonlinear effects (both multiphoton and vacuum polarization) are prominent. Nonlinear Compton scattering electron-positron pair production have been observed collisions 46.6 GeV 49.1 electrons the Final Focus Test Beam at SLAC with terawatt pulses 1053 nm 527 wavelengths from a Nd:glass laser. Peak laser intensities...
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...
Results from a search for neutrinoless double-beta decay (0νββ) of ^{136}Xe are presented using the first year data taken with upgraded EXO-200 detector. Relative to previous searches by EXO-200, energy resolution detector has been improved σ/E=1.23%, electric field in drift region raised 50%, and system suppress radon volume between cryostat lead shielding implemented. In addition, analysis techniques that improve topological discrimination 0νββ background events have developed....
We report the observation of two-neutrino double-beta decay in Xe-136 with T_1/2 = 2.11 +- 0.04 (stat.) 0.21 (sys.) x 10^21 yr. This second order process, predicted by Standard Model, has been observed for several nuclei but not Xe-136. The rate provides new input to matrix element calculations and search more interesting neutrino-less decay, most sensitive probe existence Majorana particles measurement neutrino mass scale.
The next-generation Enriched Xenon Observatory (nEXO) is a proposed experiment to search for neutrinoless double beta ($0\nu\beta\beta$) decay in $^{136}$Xe with target half-life sensitivity of approximately $10^{28}$ years using $5\times10^3$ kg isotopically enriched liquid-xenon time projection chamber. This improvement two orders magnitude over current limits obtained by significant increase the mass, monolithic and homogeneous configuration active medium, multi-parameter measurements...
Abstract The ATLAS experiment is constructing new all-silicon inner tracking system for HL-LHC. strip detectors cover the radial extent of 40 to 100 cm. A approach adopted use p-type silicon material, making readout in n + -strips, so-called -in-p sensors. This allows enhanced radiation tolerance against an order magnitude higher particle fluence compared LHC. To cope with varying hit rates and occupancies as a function distance, there are two barrel sensor types, short strips (SS) 2 long...
The ionization of liquefied noble gases by radiation is known to be accompanied fluctuations much larger than predicted Poisson statistics. We have studied the both scintillation and in liquid xenon measured a strong anti-correlation between two at microscopic level, with coefficient $\ensuremath{-}0.80<{\ensuremath{\rho}}_{\mathrm{ep}}<\ensuremath{-}0.60.$ This provides direct experimental evidence that electron-ion recombination partially responsible for anomalously large same time allows...
The ATLAS TRT barrel is a tracking drift chamber using 52,544 individual tubular tubes. It one part of the Inner Detector, which consists three sub-systems: pixel detector spanning radius range 4 to 20 cm, semiconductor tracker (SCT) from 30 52 and transition radiation (TRT) 56 108 cm. covers central pseudo-rapidity region |η|< 1, while endcaps cover forward backward eta regions. These systems provide combination continuous with many measurements in tubes (or straws) electron identification...
A search for Lorentz- and $CPT$-violating signals in the double beta decay spectrum of $^{136}\mathrm{Xe}$ has been performed using an exposure $100\text{ }\text{ }\mathrm{kg}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{yr}$ with EXO-200 detector. No significant evidence spectral modification due to isotropic Lorentz-violation was found, a two-sided limit $\ensuremath{-}2.65\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}\text{...
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...
Caribou is a versatile data acquisition system used in multiple collaborative frameworks (CERN EP R&D, DRD3, AIDAinnova, Tangerine) for laboratory and test-beam qualification of novel silicon pixel detector prototypes. The built around common hardware, firmware software stack shared accross different projects, thereby drastically reducing the development effort cost. It consists custom Control Readout (CaR) board commercial Xilinx Zynq System-on-Chip (SoC) platform. SoC platform runs full...
A straw proportional counter is the basic element of ATLAS Transition Radiation Tracker (TRT). Its detailed properties as well main a few TRT operating gas mixtures are described. Particular attention paid to tube performance in high radiation conditions and its operational stability.
EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless double-beta decay of $^{136}$Xe. Here we report on various Majoron-emitting modes based 100 kg$\cdot$yr exposure A lower limit $T^{^{136}Xe}_{1/2} >1.2 \cdot 10^{24}$ yr at 90% C.L. the half-life spectral index = 1 Majoron was obtained, corresponding constraint Majoron-neutrino coupling constant $|< g^{M}_{ee} >|<$ (0.8-1.7)$\cdot$10$^{-5}$.
Alpha decays in the EXO-200 detector are used to measure fraction of charged $^{218}\text{Po}$ and $^{214}\text{Bi}$ daughters created from $\ensuremath{\alpha}$ $\ensuremath{\beta}$ decays, respectively. $^{222}\text{Rn} \ensuremath{\alpha}$ liquid xenon (LXe) found produce $^{218}\text{Po}^{+}$ ions $50.3\ifmmode\pm\else\textpm\fi{}3.0%$ time, while remainder atoms neutral. The $^{214}\text{Bi}^{+}$ $^{214}\text{Pb} \ensuremath{\beta}$ LXe is be $76.4\ifmmode\pm\else\textpm\fi{}5.7%$,...
The EXO-200 Collaboration is searching for neutrinoless double $\ensuremath{\beta}$ decay using a liquid xenon (LXe) time projection chamber. This measurement relies on modeling the transport of charge deposits produced by interactions in LXe to allow discrimination between signal and background events. Here we present measurements transverse diffusion constant drift velocity electrons at fields 20 V/cm 615 data. At operating field 380 measures...
The search for neutrinoless double-beta decay (0νββ) requires extremely low background and a good understanding of their sources influence on the rate in region parameter space relevant to 0νββ signal. We report studies various β γ backgrounds liquid-xenon-based EXO-2000νββ experiment. With this work we try better understand location strength specific compare conclusions radioassay results taken before during detector construction. Finally, discuss implications these EXO-200 as well...
Progress on a method of barium tagging for the nEXO double beta decay experiment is reported. Absorption and emission spectra deposits atoms ions in solid xenon matrices are presented. Excitation prominent lines, temperature dependence, bleaching fluorescence reveal existence different matrix sites. A regular series sharp lines observed ${\mathrm{Ba}}^{+}$ identified with some type hydride molecule. Lower limits quantum efficiency principal Ba transition Under current conditions, an image...
Future tonne-scale liquefied noble gas detectors depend on efficient light detection in the VUV range. In past years Silicon Photomultipliers (SiPMs) have emerged as a valid alternative to standard photomultiplier tubes or large area avalanche photodiodes. The next generation double beta decay experiment, nEXO, with 5 tonne liquid xenon time projection chamber, will use SiPMs for detecting $178\,\text{nm}$ scintillation light, order achieve an energy resolution of $\sigma / Q_{\beta\beta} =...
The instantaneous luminosity of the Large Hadron Collider at CERN will be increased up to a factor five with respect present design value by undergoing an extensive upgrade program over coming decade. most important project for ATLAS Muon System is replacement first station in forward regions so-called New Small Wheels (NSWs). NSWs installed during LHC long shutdown 2018/19. Small-Strip Thin Gap Chamber (sTGC) detectors are designed provide fast trigger and high precision muon tracking under...
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...
Abstract Construction of the new all-silicon Inner Tracker (ITk), developed by ATLAS collaboration to be able track charged particles produced at High-Luminosity LHC, started in 2020 and is expected continue till 2028. The ITk detector will include 18,000 highly segmented radiation hard n+-in-p silicon strip sensors (ATLAS18), which are being manufactured Hamamatsu Photonics. Mechanical electrical characteristics measured upon their delivery several institutes participating a complex Quality...