A5006904587- Nuclear physics research studies
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Astro and Planetary Science
- High-Energy Particle Collisions Research
- Atomic and Molecular Physics
- Radiation Therapy and Dosimetry
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Nuclear reactor physics and engineering
- Astronomical and nuclear sciences
- Radiation Effects in Electronics
- Atomic and Subatomic Physics Research
- Parallel Computing and Optimization Techniques
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Photocathodes and Microchannel Plates
- Spacecraft Design and Technology
- Neutrino Physics Research
- Advanced NMR Techniques and Applications
- Hip disorders and treatments
- Orthopaedic implants and arthroplasty
Los Alamos National Laboratory
2021-2024
National Superconducting Cyclotron Laboratory
2015-2024
Michigan State University
2015-2024
University of Kentucky
2023
Western Kentucky University
2023
Washington University in St. Louis
2019-2020
American University of the Caribbean
2019
Illinois Environmental Protection Agency
2007
Imperial College London
1996
University of Wisconsin–Madison
1967
Many neutron star properties, such as the proton fraction, reflect symmetry energy contributions to equation of state that dominate when and densities differ strongly. To constrain these at suprasaturation densities, we measure spectra charged pions produced by colliding rare isotope tin (Sn) beams with isotopically enriched Sn targets. Using ratios pion measured high transverse momenta, deduce slope be $42<L<117\text{ }\text{ }\mathrm{MeV}$. This value is slightly lower but consistent $L$...
In the past two decades, pions created in high density regions of heavy ion collisions have been predicted to be sensitive at densities symmetry energy term nuclear equation state, a property that is key our understanding neutron stars. new experiment designed study energy, multiplicities negatively and positively charged measured with accuracy for central 132Sn+124Sn, 112Sn+124Sn, 108Sn+112Sn E/A=270 MeV SπRIT Time Projection Chamber. While individual pion are 4% accuracy, those...
^{18}Mg was observed, for the first time, by invariant-mass reconstruction of ^{14}O+4p events. The ground-state decay energy and width are E_{T}=4.865(34) MeV Γ=115(100) keV, respectively. observed momentum correlations between five particles consistent with two sequential steps prompt 2p passing through ground state ^{16}Ne. spectrum also provides evidence an excited at excitation 1.84(14) MeV, which is likely 2^{+} state. As this exceeds that in ^{20}Mg, observation argument demise N=8...
The structure of the extremely proton-rich nucleus $^{11}_{~8}$O$_3$, mirror two-neutron halo $^{11}_{~3}$Li$_8$, has been studied experimentally for first time. Following knockout reactions with a $^{13}$O beam, $^{11}$O decay products were detected after two-proton emission and used to construct an invariant-mass spectrum. A broad peak width $\sim$3\,MeV was observed. Within Gamow coupled-channel approach, it concluded that this is multiplet contributions from four-lowest resonant states:...
Pion energy spectra are presented for central collisions of neutron-rich 132Sn+124Sn and neutron-deficient 108Sn+112Sn systems using simulations with Boltzmann-Uehling-Uhlenbeck transport model. These calculations, which incorporate isospin-dependent mean field potentials relevant baryons mesons, display a sensitivity to the pion that could allow significant constraints on density dependence symmetry its potential at supra-saturation densities. The predicted increases isospin asymmetry total...
Dielectric materials are foundational to our modern-day communications, defense, and commerce needs. Although dielectric breakdown is a primary cause of failure these systems, we do not fully understand this process. We analyzed the channel propagation dynamics two distinct types electrical trees. One type trees has been formally classified. observed speed tree exceed 10 million meters per second. These results identify substantial gaps in understanding breakdown, filling paramount design...
The experiment for space radiation analysis is an upcoming project Los Alamos National Laboratory. This 12U CubeSat will be placed in a geosynchronous transfer orbit to make measurements of the charged particle populations belts. Currently, there are no data from CubeSats operating belts, and although GTOsat soon this active development. energetic sensor on board telescope which test mature new technologies use missions. energy range interest 100 keV 1000 MeV protons, 20 electrons.
The Experiment for Space Radiation Analysis (ESRA) is the next in series of Demonstration and Validation (DemVal) projects Los Alamos National Laboratory (LANL) program will fly. ESRA mature technologies such as novel Wide-field-of-view Plasma Spectrometer (WPS) Energetic Charged Particle (ECP) telescope, along with high voltage power supply, a 3U Eurocard single board computers, flight software architecture, analog-to-digital electronics. WPS ECP sensors are intended to actively monitor...
The Experiment for Space Radiation Analysis (ESRA) is the first in a new series of demonstration and validation missions Los Alamos National Laboratory. This mission will utilize 12U CubeSat platform be placed geosynchronous transfer orbit to make measurements dynamic charged particle populations Earth's radiation belts. Currently, there are no data from CubeSats operating belts this an active space development. Energetic Charged Particle (ECP) instrument on board ESRA telescope which aims...
Particle-decaying states of the light nuclei $^{11,12}\mathrm{N}$ and $^{12}\mathrm{O}$ were studied using invariant-mass method. The decay energies intrinsic widths a number measured, momentum correlations three-body decaying considered. A second $2p$-decaying ${2}^{+}$ state was observed for first time, higher-energy in $4p+2\ensuremath{\alpha}$ channel. This channel also contains contributions from fissionlike paths, including...
Shell closures and their associated magic numbers of nucleons provide a unique means for studying the structure exotic nuclei far from stability. An experiment was recently performed at National Superconducting Cyclotron Laboratory to measure resonant elastic proton scattering on 46Ar in inverse kinematics region containing isobaric analogue states 47Ar, an N=29 nucleus with one neutron above N=28 shell closure. Four candidate resonances were observed: corresponding 3/2− ground state another...
The invariant-mass distribution of $^{11}\mathrm{O}$ fragments formed in two-neutron-knockout reactions with a $^{13}\mathrm{O}$ projectile and $^{9}\mathrm{Be}$ target has been further examined. Gating on events where the $^{9}\mathrm{C}$ decay produced following $2p$ emission are recoiled transversely projectile's frame improves overall resolution. observed peak is now shown to have contributions from at least two levels, contradiction suggestion Fortune [Phys. Rev. C 99, 051302(R)...
The Superconducting Analyzer for MUlti-particles from RAdioIsotope (SAMURAI) Pion-Reconstruction and Ion-Tracker Time Projection Chamber (SπRIT TPC) was designed to enable measurements of heavy ion collisions with the SAMURAI spectrometer at RIKEN radioactive isotope beam factory provides constraints on equation state neutron-rich nuclear matter. SπRIT TPC has a 50.5 cm drift length an 86.4 × 134.4 cm2 pad plane 12 096 pads that are equipped generic electronics TPCs. allows excellent...
The Falcon Solid-state Energetic Electron Detector (SEED) is a single element particle telescope designed to measure 14 145 keV electrons in geostationary Earth orbit. instrument be low-resource space weather sensor and utilizes commercial-off-the-shelf components further reduce cost. calibrated on-orbit against the Los Alamos National Laboratory Space Atmospheric Burst Report System plasma spectrometer co-located on same STPSat-6 satellite, as well electron measurements from NOAA GOES satellites.
Properties of the nuclear equation state (EoS) can be probed by measuring dynamical properties nucleus-nucleus collisions. In this study, we present directed flow (v1), elliptic (v2) and stopping (VarXZ) measured in fixed target Sn + collisions at with SπRIT Time Projection Chamber. We perform Bayesian analyses which EoS parameters are varied simultaneously within Improved Quantum Molecular Dynamics-Skyrme (ImQMD-Sky) transport code to obtain a multivariate correlated constraint. The include...
The Experiment for Space Radiation Analysis (ESRA) is the first in a new series of demonstration and validation missions Los Alamos National Laboratory. This mission will utilize 12U CubeSat platform be placed Geosynchronous Transfer Orbit (GTO) to make measurements dynamic charged particle populations Earth's radiation belts. To date, there has never been an operational GTO. Energetic Charged Particle (ECP) instrument on board ESRA telescope which aims test mature technologies. energy range...
The Experiment for Space Radiation Analysis (ESRA) is the next in series of Demonstration and Validation (DemVal) projects Los Alamos National Laboratory (LANL) program will fly. ESRA mature technologies such as novel Wide-field-of-view Plasma Spectrometer (WPS) Energetic Charged Particle (ECP) telescope, along with high voltage power supply, a 3U Eurocard single board computers, flight software architecture, analog-to-digital electronics. WPS ECP sensors are intended to actively monitor...