D. Sinclair
A5026169371- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Image Retrieval and Classification Techniques
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Advanced Image and Video Retrieval Techniques
- Advanced Vision and Imaging
- Video Analysis and Summarization
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Nuclear physics research studies
- Medical Image Segmentation Techniques
- Semantic Web and Ontologies
- Gamma-ray bursts and supernovae
- Robotics and Sensor-Based Localization
- Cosmology and Gravitation Theories
- Computer Graphics and Visualization Techniques
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Computational Geometry and Mesh Generation
- Solar and Space Plasma Dynamics
- Calibration and Measurement Techniques
Edinburgh Napier University
2024
Carleton University
2014-2023
TRIUMF
2013-2023
Culham Science Centre
2022
United Kingdom Atomic Energy Authority
2022
Laurentian University
1986-2019
United States Agency for International Development
2019
Walt Disney (United States)
2017
SLAC National Accelerator Laboratory
2007-2017
Stanford University
2009
We report on a search for neutrinoless double-beta decay of $^{136}$Xe with EXO-200. No signal is observed an exposure 32.5 kg-yr, background ~1.5 x 10^{-3} /(kg yr keV) in the $\pm 1\sigma$ region interest. This sets lower limit half-life $T_{1/2}^{0\nu\beta\beta}$($^{136}$Xe) > 1.6 10$^{25}$ (90% CL), corresponding to effective Majorana masses less than 140-380 meV, depending matrix element calculation.
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....
The Baksan Experiment on Sterile Transitions (BEST) was designed to investigate the deficit of electron neutrinos ν_{e} observed in previous gallium-based radiochemical measurements with high-intensity neutrino sources, commonly referred as "gallium anomaly," which could be interpreted evidence for oscillations between and sterile (ν_{s}) states. A 3.414-MCi ^{51}Cr source placed at center two nested Ga volumes were made production ^{71}Ge through charged current reaction,...
In current systems for browsing image collections, users are presented with sets of thumbnail images arranged in some default order on the screen. We investigating whether it benefits to have thumbnails according their mutual similarity, so that alike placed together. There are, course, many possible definitions “similarity”: far we explored measurements based low-level visual features, and textual captions assigned images. Here describe two experiments, both involving designers as...
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.
We report on an improved measurement of the $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ half-life ${}^{136}$Xe performed by EXO-200. The use a large and homogeneous time-projection chamber allows for precise estimate fiducial mass used measurement, resulting in small systematic uncertainty. also discuss detail data-analysis methods double-$\ensuremath{\beta}$ decay searches with EXO-200, while emphasizing those directly related to present measurement. is found be...
EXO-200 is an experiment designed to search for double beta decay of $^{136}$Xe with a single-phase, liquid xenon detector. It uses active mass 110 kg enriched 80.6% in the isotope 136 ultra-low background time projection chamber capable simultaneous detection ionization and scintillation. This paper describes detector particular attention most innovative aspects design that revolve around reduction backgrounds, efficient use expensive isotopically xenon, optimization energy resolution...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Polymerization of Silicic AcidSidney A. Greenberg and David SinclairCite this: J. Phys. Chem. 1955, 59, 5, 435–440Publication Date (Print):May 1, 1955Publication History Published online1 May 2002Published inissue 1 1955https://pubs.acs.org/doi/10.1021/j150527a014https://doi.org/10.1021/j150527a014research-articleACS PublicationsRequest reuse permissionsArticle Views782Altmetric-Citations79LEARN ABOUT THESE METRICSArticle Views are the...
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...
In this paper, we introduce \textbf{HarmoFusion}, a comprehensive framework that seamlessly integrates multi-granular information for robust multimodal emotion analysis. Traditional approaches in recognition often rely solely on either holistic, pre-trained utterance-level embeddings or isolated fine-grained features, which can result suboptimal performance when dealing with the subtle and dynamic nature of emotional expression. HarmoFusion bridges gap by unifying global representations...
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...
A similarity metric based on the low-level content of images can be used to create a visualisation in which visually similar are displayed close each other. We carrying out series experiments evaluate usefulness this type as an image browsing aid. The initial experiment, described, considered whether people would find given photograph more quickly than randomly arranged grid images. results show that subjects were faster with visualisation, although post-experiment interviews many them said...
This paper tackles the problem of obtaining a good initial set corner matches between two images without resorting to any constraints from motion or structure models. Several different matching metrics, both traditional and statistical, are evaluated effect using sub-pixel information is studied. It found that, in most cases, commonly-used crosscorrelation does not perform as well some other measures, such test sum squared differences, that it essential use accuracy if mismatches be avoided....
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...
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...