M. A. Blackston
A5052227385- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Nuclear physics research studies
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Nuclear reactor physics and engineering
- Quantum Chromodynamics and Particle Interactions
- Medical Imaging Techniques and Applications
- Neutrino Physics Research
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Advanced X-ray and CT Imaging
- Quantum, superfluid, helium dynamics
- Atomic and Molecular Physics
- Radiation Therapy and Dosimetry
- Astronomical and nuclear sciences
- Digital Radiography and Breast Imaging
- High-pressure geophysics and materials
- X-ray Spectroscopy and Fluorescence Analysis
- Particle accelerators and beam dynamics
- Boron Compounds in Chemistry
- Advanced Chemical Physics Studies
- Superconducting Materials and Applications
- Context-Aware Activity Recognition Systems
Oak Ridge National Laboratory
2015-2025
Duke University
2006-2011
Office of Scientific and Technical Information
2009-2011
National Technical Information Service
2011
Triangle Universities Nuclear Laboratory
2006-2008
Temple University
2008
University of Saskatchewan
2008
Canadian Light Source (Canada)
2008
University of Virginia
2008
Thomas Jefferson National Accelerator Facility
2008
We report the first measurement of coherent elastic neutrino-nucleus scattering (CEvNS) on argon using a liquid detector at Oak Ridge National Laboratory Spallation Neutron Source. Two independent analyses prefer CEvNS over background-only null hypothesis with greater than $3\ensuremath{\sigma}$ significance. The measured cross section, averaged incident neutrino flux, is $(2.2\ifmmode\pm\else\textpm\fi{}0.7)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}39}\text{ }\text{...
We measured the cross section of coherent elastic neutrino-nucleus scattering (CEvNS) using a CsI[Na] scintillating crystal in high flux neutrinos produced at Spallation Neutron Source Oak Ridge National Laboratory. New data collected before detector decommissioning have more than doubled dataset since first observation CEvNS, achieved with this detector. Systematic uncertainties also been reduced an updated quenching model, allowing for improved precision. With these analysis improvements,...
The COHERENT Collaboration searched for scalar dark matter particles produced at the Spallation Neutron Source with masses between 1 and 220 MeV/c^{2} using a CsI[Na] scintillation detector sensitive to nuclear recoils above 9 keV_{nr}. No evidence is found we thus place limits on allowed parameter space. With this low-threshold detector, are coherent elastic scattering nuclei. cross section process orders of magnitude higher than other processes historically used accelerator-based...
The COHERENT experiment is well poised to test sub-GeV dark matter models using low-energy recoil detectors sensitive coherent elastic neutrino-nucleus scattering (CEvNS) in the $\pi$-DAR neutrino beam produced by Spallation Neutron Source. We show how a planned 750-kg liquid argon scintillation detector would place leading limits on scalar light models, over two orders of magnitude mass, for particles through vector and leptophobic portals absence other effects beyond standard model....
The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory is a pulsed source of neutrons and, as by-product this operation, an intense neutrinos via stopped-pion decay. COHERENT collaboration uses to investigate coherent elastic neutrino-nucleus scattering and other physics with suite detectors. This work includes description our geant4 simulation neutrino production the SNS flux calculation which informs studies. We estimate uncertainty $\ensuremath{\sim}10%$ level based on...
Measurements of the absolute cross section and angular distributions for $$^{11} \hbox{B}(p,\alpha)^{8}{\text{Be}}\rightarrow\alpha+\alpha$$ 11B(α,α)11B reactions have been performed from 0.15 to 3.8 MeV 11B(p,α) study 2 5.4 11B(α,α) reaction. The sections are presented in terms total number α-particles detected order avoid uncertainties due ambiguities alpha particles emitted reaction at a particular energy. 11B(p,α)8Be(2+) were fit Legendre polynomial expansion coefficients presented....
Coherent elastic neutrino-nucleus scattering (CEvNS) is the dominant neutrino channel for neutrinos of energy $E_\nu < 100$ MeV. We report a limit this process using data collected in an engineering run 29 kg CENNS-10 liquid argon detector located 27.5 m from Oak Ridge National Laboratory Spallation Neutron Source (SNS) Hg target with $4.2\times 10^{22}$ protons on target. The dataset yielded $< 7.4$ observed CEvNS events implying cross section process, averaged over SNS pion decay-at-rest...
A measurement of the helicity dependence total inclusive photoabsorption cross section on deuteron was carried out at MAMI (Mainz) in energy range 200<Eγ<800MeV. The experiment used a 4π detection system, circularly polarized tagged photon beam and frozen spin target which provided longitudinally deuterons. These new results are significant improvement existing data allow detailed comparison with state-of-the-art calculations.
We report on the technical design and expected performance of a 592 kg heavy-water-Cherenkov detector to measure absolute neutrino flux from pion-decay-at-rest source at Spallation Neutron Source (SNS) Oak Ridge National Laboratory (ORNL). The will be located roughly 20 m SNS target with better than 5% statistical uncertainty in 2 years. This heavy-water serve as first module two-module system ultimately 2-3% both First Target Station planned Second SNS. significantly reduce dominant...
Abstract We present results of several measurements CsI[Na] scintillation response to 3–60 keV energy nuclear recoils performed by the COHERENT collaboration using tagged neutron elastic scattering experiments and an endpoint technique. Earlier results, used estimate coherent neutrino-nucleus (CEvNS) event rate for first observation this process achieved at Spallation Neutron Source (SNS), have been reassessed. discuss corrections identified systematic effects update respective uncertainty...
It is shown that a measurement of the analyzing power obtained with linearly polarized \ensuremath{\gamma}-rays and an unpolarized target can provide indirect determination two physical quantities. These are Gerasimov-Drell-Hearn (GDH) sum rule integrand for deuteron forward spin polarizability (${\ensuremath{\gamma}}_{0}$) near photodisintegration threshold. An analysis data $d(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},n)p$ reaction other experiments presented. A fit to world...
The $^{40}\mathrm{Ar}$($\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},{\ensuremath{\gamma}}^{\ensuremath{'}}$) photon scattering reaction was used to search for spin-flip $M1$ strength in $^{40}\mathrm{Ar}$. nearly monochromatic, linearly polarized beam of HI\ensuremath{\gamma}S, an energy region from 7.7 11 MeV, employed this study. 28 dipole excitations were observed. azimuthal intensity asymmetry indicated that all these states $E1$ except the state at ${E}_{x}=9.757$ MeV....
Angular distributions of the cross section and linear analyzing powers have been measured for $d(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},n)p$ reaction at High Intensity $\ensuremath{\gamma}$-ray Source with linearly polarized beams 14 16 MeV. The outgoing neutrons were detected using Blowfish detector array, consisting 88 liquid scintillator detectors large solid angle coverage. amplitudes reduced transition matrix elements extracted by means fits to data good agreement was...
The COHERENT experiment located in Neutrino Alley at the Spallation Neutron Source (SNS), Oak Ridge National Laboratory (ORNL), has made world's first two measurements of coherent elastic neutrino-nucleus scattering (CEvNS), on CsI and argon, using neutrinos produced SNS. collaboration continues to pursue CEvNS various targets as well additional studies inelastic interactions, searches for accelerator-produced dark matter (DM) physics beyond Standard Model, uniquely high-quality...
One of the primary goals scintillator-based gamma-ray detector development is to obtain spatial resolutions in bulk crystals at millimeter level all three dimensions. An even more challenging goal disentangle multiple simultaneous energy depositions with comparable resolutions. We are exploring a new technique achieve this performance through use close-coupled, coded-aperture shadow masks placed between crystal and position-sensitive phototransducer. report on simulations such device using...
Monte Carlo simulation techniques are powerful tools for investigating the performance of imaging detectors. DETECT2000, a Monte-Carlo package light transport simulation, has been commonly used to model optical properties scintillation detectors and is able realistically estimate response photodetectors. However, DETECT2000 generally runs slowly when complex detector geometries specified lack visualization makes it difficult accurately define geometries. GEANT4 toolkit that can also photon...