A5090655795- Particle physics theoretical and experimental studies
- Stellar, planetary, and galactic studies
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- High-Energy Particle Collisions Research
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Astro and Planetary Science
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Adaptive optics and wavefront sensing
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Radiation Detection and Scintillator Technologies
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Electric Motor Design and Analysis
- Astrophysical Phenomena and Observations
- Infrared Target Detection Methodologies
- Magnetic Bearings and Levitation Dynamics
- Sensorless Control of Electric Motors
Positive Living North
2012-2023
Dominion Astrophysical Observatory
2012-2023
Herzberg Institute of Astrophysics
2012-2023
National Academies of Sciences, Engineering, and Medicine
2022
College of the Desert
2020-2022
University of Colorado System
2009-2021
Mount Washington Observatory
2021
College of New Caledonia
2013-2020
Konkoly Observatory
2017-2019
Institute of High Energy Physics
2017
We report a first search for weakly interacting massive particles (WIMPs) using the background rejection capabilities of SuperCDMS. An exposure 577 kg days was analyzed WIMPs with mass <30 GeV/c(2), signal region blinded. Eleven events were observed after unblinding. set an upper limit on spin-independent WIMP-nucleon cross section 1.2×10(-42) cm(2) at 8 GeV/c(2). This result is in tension WIMP interpretations recent experiments and probes new parameter space scattering masses <6
The MiniBooNE Collaboration reports first results of a search for $\nu_e$ appearance in $\nu_\mu$ beam. With two largely independent analyses, we observe no significant excess events above background reconstructed neutrino energies 475 MeV. data are consistent with oscillations within appearance-only oscillation model.
We report results of a search for weakly interacting massive particles (WIMPS) with the silicon detectors CDMS II experiment. This blind analysis 140.2 kg day data taken between July 2007 and September 2008 revealed three WIMP-candidate events surface-event background estimate 0.41(-0.08)(+0.20)(stat)(-0.24)(+0.28)(syst). Other known backgrounds from neutrons 206Pb are limited to <0.13 <0.08 at 90% confidence level, respectively. The exposure this is equivalent 23.4 recoil energy range 7-100...
The MiniBooNE experiment at Fermilab reports results from a search for ${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}\ensuremath{\rightarrow}{\overline{\ensuremath{\nu}}}_{e}$ oscillations, using data sample corresponding to $5.66\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on target. An excess of $20.9\ifmmode\pm\else\textpm\fi{}14.0$ events is observed in the energy range $475<{E}_{\ensuremath{\nu}}^{\mathrm{QE}}<1250\text{ }\text{ }\mathrm{MeV}$, which, when constrained by...
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 high-statistics sample of charged-current muon neutrino scattering events collected with the MiniBooNE experiment is analyzed to extract first measurement double differential cross section ($\frac{d^2\sigma}{dT_\mu d\cos\theta_\mu}$) for quasielastic (CCQE) on carbon. This result features minimal model dependence and provides most complete information this process date. With assumption CCQE scattering, absolute as a function energy ($\sigma[E_\nu]$) single ($\frac{d\sigma}{dQ^2}$) are...
The MiniBooNE Collaboration observes unexplained electronlike events in the reconstructed neutrino energy range from 200 to 475 MeV. With $6.46\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on target, 544 are observed this range, compared an expectation of $415.2\ifmmode\pm\else\textpm\fi{}43.4$ events, corresponding excess $128.8\ifmmode\pm\else\textpm\fi{}20.4\ifmmode\pm\else\textpm\fi{}38.3$ events. shape several kinematic variables is consistent with being due either...
We report new results from the Cryogenic Dark Matter Search (CDMS II) at Soudan Underground Laboratory. Two towers, each consisting of six detectors, were operated for 74.5 live days, giving spectrum-weighted exposures 34 (12) kg d Ge (Si) targets after cuts, averaged over recoil energies 10--100 keV a weakly interacting massive particle (WIMP) mass $60\text{ }\text{ }\mathrm{GeV}/{c}^{2}$. A blind analysis was conducted, incorporating improved techniques rejecting surface events. No WIMP...
The steps in t he applied voltages of a three-phase, inverter-induction motor drive system cause undesirable pulsations motortor By using multiple inverters connected to multiphase machine with appropriate winding displacements, significant improvement performance is possible. displacements required, however, are not necessarily the symmetrical used standard machines. This paper sets forth an improved method for analyzing many types unsymmetrical, as well symmetrical, induction simulation...
The Booster Neutrino Experiment (MiniBooNE) searches for numu-to-nue oscillations using the O(1 GeV) neutrino beam produced by synchrotron at Fermi National Accelerator Laboratory (FNAL). delivers protons with 8 GeV kinetic energy (8.89 GeV/c momentum) to a beryllium target, producing neutrinos from decay of secondary particles in line. We describe Monte Carlo simulation methods used estimate flux beamline incident on MiniBooNE detector both polarities focussing horn. uses Geant4 framework...
SuperCDMS is an experiment designed to directly detect Weakly Interacting Massive Particles (WIMPs), a favored candidate for dark matter ubiquitous in the Universe. In this paper, we present WIMP-search results using calorimetric technique call CDMSlite, which relies on voltage- assisted Luke-Neganov amplification of ionization energy deposited by particle interactions. The data were collected with single 0.6 kg germanium detector running 10 live days at Soudan Underground Laboratory. A low...
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 MiniBooNE experiment at Fermilab reports a total excess of $638.0\ifmmode\pm\else\textpm\fi{}52.1(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}122.2(\mathrm{syst}.)$ electronlike events from data sample corresponding to $18.75\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons-on-target in neutrino mode, which is 46% increase the with respect previously published results and $11.27\ifmmode\times\else\texttimes\fi{}{10}^{20}$ antineutrino mode. overall significance excess,...
We report the first results from a search for weakly interacting massive particles (WIMPs) in Cryogenic Dark Matter Search experiment at Soudan Underground Laboratory. Four Ge and two Si detectors were operated 52.6 live days, providing 19.4 kg d of net exposure after cuts recoil energies between 10 100 keV. A blind analysis was performed using only calibration data to define energy threshold selection criteria nuclear-recoil candidates. Using standard dark-matter halo nuclear-physics WIMP...
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...
We report a measurement of the flux-averaged neutral-current elastic differential cross section for neutrinos scattering on mineral oil (${\mathrm{CH}}_{2}$) as function four-momentum transferred squared, ${Q}^{2}$. It is obtained by measuring kinematics recoiling nucleons with kinetic energy greater than 50 MeV which are readily detected in MiniBooNE. This cross-section distribution fit fixed nucleon form factors apart from an axial mass ${M}_{A}$ that provides best...
ABSTRACT OJ 287 is a quasi-periodic quasar with roughly 12 year optical cycles. It displays prominent outbursts that are predictable in binary black hole model. The model predicted major outburst 2015 December. We found the did occur within expected time range, peaking on December 5 at magnitude 12.9 R -band. Based Swift /XRT satellite measurements and polarization data, we find it included thermal component. Its timing provides an accurate estimate for spin of primary hole, . present also...
A stability study of an induction machine is performed by applying the root-locus criterion to equations which describe behavior during small displacements about a steady-state operating point. This investigation reveals that symmetrical may become unstable at low speeds (low frequencies) even though balanced, constant amplitude, sinusoidal voltages are applied stator terminals. Regions instability established from results digital computer study. The analog included illustrate modes...
Abstract Results from regular monitoring of relativistic compact binaries like PSR 1913+16 are consistent with the dominant (quadrupole) order emission gravitational waves (GWs). We show that observations associated binary black hole (BBH) central engine blazar OJ 287 demand inclusion radiation reaction effects beyond quadrupolar order. It turns out even certain hereditary contributions to GW required predict impact flare timings 287. develop an approach incorporates this effect into BBH...
The Cryogenic Dark Matter Search (CDMS-II) employs low-temperature Ge and Si detectors to seek Weakly Interacting Massive Particles (WIMPs) via their elastic scattering interactions with nuclei. Simultaneous measurements of both ionization phonon energy provide discrimination against background particles. For recoil energies above 10 keV, events due photons are rejected >99.99% efficiency. Electromagnetic very near the detector surface can mimic nuclear recoils because reduced charge...
The MiniBooNE Collaboration reports initial results from a search for ${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}\ensuremath{\rightarrow}{\overline{\ensuremath{\nu}}}_{e}$ oscillations. A signal-blind analysis was performed using data sample corresponding to $3.39\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on target. are consistent with background prediction across the full range of neutrino energy reconstructed assuming quasielastic scattering,...