A5033769036- Laser-Plasma Interactions and Diagnostics
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Magnetic confinement fusion research
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Plasma Diagnostics and Applications
- Laser-induced spectroscopy and plasma
- Pulsed Power Technology Applications
- Atomic and Molecular Physics
- Dark Matter and Cosmic Phenomena
- Laser-Matter Interactions and Applications
- Gyrotron and Vacuum Electronics Research
- Particle Detector Development and Performance
- Ion-surface interactions and analysis
- Advanced X-ray Imaging Techniques
- Nuclear Physics and Applications
- Superconducting Materials and Applications
- Quantum Chromodynamics and Particle Interactions
- Laser Design and Applications
- Ionosphere and magnetosphere dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Blood groups and transfusion
- Hemoglobinopathies and Related Disorders
University of Colorado System
2022-2024
University of Colorado Boulder
2017-2024
Agia Olga Hospital
2019-2022
Metaxa Hospital
2021
SLAC National Accelerator Laboratory
2012-2020
Stony Brook University
2019
University of California, Los Angeles
2017
Boston University
2006-2015
Linac Coherent Light Source
2014
Menlo School
2014
The results of the second phase Super-Kamiokande solar neutrino measurement are presented and compared to first phase. flux spectrum time variation as well oscillation statistically consistent with do not show spectral distortion. time-dependent combined phases coincides full period cycle 23 shows no correlation activity. measured $^{8}\mathrm{B}$ total is...
The results of the third phase Super-Kamiokande solar neutrino measurement are presented and compared to first second results. With improved detector calibrations, a full simulation, analysis methods, systematic uncertainty on total flux is estimated be ?2.1%, which about two thirds for Super-Kamiokande. observed 8B in 5.0 20 MeV electron energy region 2.32+/-0.04 (stat.)+/-0.05 (sys.) *10^6 cm^-2sec^-1, agreement with previous measurements. A combined oscillation carried out using SK-I, II,...
We present a search for non-zero theta_{13} and deviations of sin^2 theta_{23} from 0.5 in the oscillations atmospheric neutrino data Super-Kamiokande -I, -II, -III. No distortions flux consistent with are found both mass hierarchy hypotheses agreement data. The best fit at Delta m^2 = 2.1 x 10^-3 eV^2, 0.0, =0.5. In normal (inverted) constrained one-dimensional 90% C.L. to < 0.04 (0.09) 1.9 (1.7) 2.6 (2.7) eV^2. mixing angle is within 0.407 <= 0.583
A new Super-Kamiokande (SK) search for Supernova Relic Neutrinos (SRNs) was conducted using 2853 live days of data. Sensitivity is now greatly improved compared to the 2003 SK result, which placed a flux limit near many theoretical predictions. This more detailed analysis includes variety improvements such as increased efficiency, lower energy threshold, and an expanded data set. New combined upper limits on SRN are between 2.8 3.0 nu_e cm^-2 s^-1 > 16 MeV total positron (17.3 E_nu).
The result of a search for neutrino bursts from supernova explosions using the Super-Kamiokande detector is reported. sensitive to core-collapse via observation their emissions. expected number events comprising such burst ~10^4 and average energy neutrinos in few tens MeV range case explosion at typical distance our galaxy (10 kiloparsecs); this large signal means that detection efficiency anywhere within well past Magellanic Clouds 100%. We examined data set which was taken May, 1996 July,...
We present the result of an indirect search for high energy neutrinos from WIMP annihilation in Sun using upward-going muon (upmu) events at Super-Kamiokande. Datasets SKI-SKIII (3109.6 days) were used analysis. looked excess neutrino signal as compared with expected atmospheric background three upmu categories: stopping, non-showering, and showering. No significant was observed. The 90% C.L. upper limits flux induced by WIMPs 100 GeV/c$^2$ 6.4$\times10^{-15}$ cm$^{-2}$ sec$^{-1}$...
Abstract Plasma wakefield accelerators have been used to accelerate electron and positron particle beams with gradients that are orders of magnitude larger than those achieved in conventional accelerators. In addition being accelerated by the plasma wakefield, beam particles also experience strong transverse forces may disrupt quality. Hollow channels proposed as a technique for generating accelerating fields without forces. Here we demonstrate method creating an extended hollow channel...
A search for neutron-antineutron ($n\ensuremath{-}\overline{n}$) oscillation was undertaken in Super-Kamiokande using the 1489 live-day or $2.45\ifmmode\times\else\texttimes\fi{}{10}^{34}$ neutron-year exposure data. This process violates both baryon and minus lepton numbers by an absolute value of two units is predicted a large class hypothetical models where seesaw mechanism incorporated to explain observed tiny neutrino masses matter-antimatter asymmetry Universe. No evidence...
We have searched for proton decays via $p\ensuremath{\rightarrow}{e}^{+}{\ensuremath{\pi}}^{0}$ and $p\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\pi}}^{0}$ using data from a $91.7\text{ }\text{ }\mathrm{kt}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{yr}$ exposure of Super-Kamiokande-I $49.2\text{ Super-Kamiokande-II. No candidate events were observed with expected backgrounds induced by atmospheric neutrinos 0.3 each decay mode. From these results, we set lower limits...
A search for the appearance of tau neutrinos from nu(mu) <--> nu(tau) oscillations in atmospheric has been performed using 1489.2 days neutrino data Super-Kamiokande-I experiment. best fit signal 138+/-48(stat)-32(+15)(syst) events is obtained with an expectation 78+/-26(syst). The hypothesis no disfavored by 2.4 sigma.
In this paper we study non-standard neutrino interactions as an example of physics beyond the standard model using atmospheric data collected during Super-Kamiokande I(1996-2001) and II(2003-2005) periods. We focus on flavor-changing-neutral-currents (FCNC), which allow flavor transitions via neutral current interactions, effects violate lepton non-universality (NU) give rise to different neutral-current interaction-amplitudes for flavors. obtain a limit FCNC coupling parameter,...
Super-Kamiokande atmospheric neutrino data were fit with an unbinned maximum likelihood method to search for the appearance of tau leptons resulting from interactions oscillation-generated neutrinos in detector. Relative expectation unity, normalization is found be 1.42 ± 0.35(stat)(-0.12)(+0.14)(syst) excluding no-tau-appearance hypothesis, which would zero, at 3.8σ level. We estimate that 180.1 44.3(stat)(-15.2)(+17.8) (syst) produced 22.5 kton fiducial volume detector by during 2806 day...
Searches for a nucleon decay into charged antilepton (e+ or μ+) plus light meson (π0, π−, η, ρ0, ρ−, ω) were performed using the Super-Kamiokande I and II data. Twelve modes searched for. The total exposure is 140.9 kiloton⋅years, which includes 91.7 kiloton⋅year (1489.2 live days) of Super-Kamiokande-I 49.2 (798.6 II. number candidate events in data was consistent with atmospheric neutrino background expectation. No significant evidence observed Thus, lower limits on partial lifetime at 90%...
In this article we review the prospects of laser wakefield accelerators as next generation light sources for applications. This work arose a result discussions held at 2013 Laser Plasma Accelerators Workshop. X-ray phase contrast imaging, x-ray absorption spectroscopy, and nuclear resonance fluorescence are highlighted potential applications laser–plasma based sources. We discuss ongoing future efforts to improve properties radiation from plasma betatron emission Compton scattering using...
We present a search for differences in the oscillations of antineutrinos and neutrinos Super-Kamiokande-I, -II, -III atmospheric neutrino sample. Under two-flavor disappearance model with separate mixing parameters between antineutrinos, we find no evidence difference oscillation parameters. Best-fit antineutrino is found to be at (Δm2,sin2 2θ)=(2.0×10(-3) eV2, 1.0) consistent overall Super-K measurement.
During the past two decades of research, ultra-relativistic beam-driven plasma wakefield accelerator (PWFA) concept has achieved many significant milestones. These include demonstration ultra-high gradient acceleration electrons over meter-scale structures, efficient a narrow energy spread electron bunch at high-gradients, positron using wakes in uniform plasmas and hollow channels, demonstrating that highly nonlinear 'blow-out regime' have electric field structure necessary for preserving...
We present the results of searches for nucleon decay via bound neutron to antineutrino plus pizero and proton piplus using data from a combined 172.8 kiloton-years exposure Super-Kamiokande-I, -II, -III. set lower limits on partial lifetime each these modes. For pizero, is >1.1x10^{33} years; piplus, >3.9x10^{32} years at 90% confidence level.
Sources of high-energy photons have important applications in almost all areas research. However, the photon flux and intensity existing sources is strongly limited for energies above a few hundred keV. Here we show that high-current ultrarelativistic electron beam interacting with multiple submicrometer-thick conducting foils can undergo strong self-focusing accompanied by efficient emission gamma-ray synchrotron photons. Physically, originate from interaction near-field transition...
Electron beam quality is paramount for X-ray pulse production in free-electron-lasers (FELs). State-of-the-art linear accelerators (linacs) can deliver multi-GeV electron beams with sufficient hard X-ray-FELs, albeit requiring km-scale setups, whereas plasma-based produce on metre-scale distances, and begin to reach qualities EUV FELs. Here we show, that from plasma photocathodes many orders of magnitude brighter than state-of-the-art be generated wakefield (PWFAs), then extracted, captured,...
This document outlines a community-driven Design Study for 10 TeV pCM Wakefield Accelerator Collider. The 2020 ESPP Report emphasized the need Advanced R\&D, and 2023 P5 calls ``delivery of an end-to-end design concept, including cost scales, with self-consistent parameters throughout." leverages recent experimental theoretical progress resulting from global R\&D program in order to deliver unified, Collider concept. Accelerators provide ultra-high accelerating gradients which enables...
Hollow channel plasma wakefield acceleration is a proposed method to provide high gradients for electrons and positrons alike: key future lepton colliders. However, beams which are misaligned from the axis induce strong transverse wakefields, deflecting reducing collider luminosity. This undesirable consequence sets tight constraint on alignment accuracy of beam propagating through channel. Direct measurements misalignment-induced wakefields therefore essential designing mitigation...