A5024816554- Nuclear physics research studies
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Atomic and Molecular Physics
- Particle Accelerators and Free-Electron Lasers
- Dark Matter and Cosmic Phenomena
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Muon and positron interactions and applications
- Scientific Research and Discoveries
- Radiation Detection and Scintillator Technologies
- Black Holes and Theoretical Physics
- Radioactive contamination and transfer
- Advanced Chemical Physics Studies
- Advanced NMR Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Superconducting Materials and Applications
- Atmospheric Ozone and Climate
- Particle Detector Development and Performance
- Plasma Diagnostics and Applications
- Photocathodes and Microchannel Plates
University of Tennessee at Knoxville
2018-2024
University of Massachusetts Amherst
2021-2024
University of Colorado Boulder
1968-1971
Abstract The nEXO neutrinoless double beta (0 νββ ) decay experiment is designed to use a time projection chamber and 5000 kg of isotopically enriched liquid xenon search for the in 136 Xe. Progress detector design, paired with higher fidelity its simulation an advanced data analysis, based on one used final results EXO-200, produce sensitivity prediction that exceeds half-life 10 28 years. Specifically, improvements have been made understanding production scintillation photons charge as...
The ratio of the nucleon F_{2} structure functions, F_{2}^{n}/F_{2}^{p}, is determined by MARATHON experiment from measurements deep inelastic scattering electrons ^{3}H and ^{3}He nuclei. was performed in Hall A Facility Jefferson Lab using two high-resolution spectrometers for electron detection, a cryogenic target system which included low-activity tritium cell. data analysis used novel technique exploiting mirror symmetry nuclei, essentially eliminates many theoretical uncertainties...
We report high-precision measurements of the deeply virtual Compton scattering (DVCS) cross section at high values Bjorken variable x_{B}. DVCS is sensitive to generalized parton distributions nucleon, which provide a three-dimensional description its internal constituents. Using exact analytic expression for all possible polarization states initial and final electron state photon, we present first experimental extraction four helicity-conserving form factors (CFFs) nucleon as function...
The E12-14-012 experiment, performed in Jefferson Lab Hall A, has measured the $(e, e'p)$ cross section parallel kinematics using a natural argon target. Here, we report full results of analysis data set corresponding to beam energy 2.222 GeV, and spanning missing momentum range $15 \lesssim p_m 300$ MeV/c $12 E_m 80$ MeV. reduced section, determined as function $p_m$ $E_m$ with $\approx$4\% accuracy, been fitted Monte Carlo simulations involving model spectral including effects final state...
To probe CP violation in the leptonic sector using GeV energy neutrino beams current and future experiments argon detectors, precise models of complex underlying antineutrino interactions are needed. The E12-14-012 experiment at Jefferson Lab Hall A was designed to perform a combined analysis inclusive exclusive electron scatterings on both ($N = 22$) titanium ($Z nuclei beams. measurement nucleus provides essential information understand scattering argon, large contribution which comes from...
The success of the ambitious programs both long- and short-baseline neutrino-oscillation experiments employing liquid-argon time-projection chambers will greatly rely on precision with which weak response argon nucleus can be estimated. In E12-14-012 experiment at Jefferson Lab Hall A, we have studied properties by scattering a high-quality electron beam off high-pressure gaseous target. Here, present measured $^{40}$Ar$(e,e^{\prime})$ double differential cross section incident energy...
Inclusive electron scattering from nuclear targets has been measured to extract the dependence of inelastic cross section in Hall C at Thomas Jefferson National Accelerator facility. Results are presented for 2H, 3He, 4He, 9B, 12C, 63Cu and 197Au an incident beam energy 5.77 GeV a range momentum transfer Q^2 = 2 7 (GeV/c)^2. These data improve precision existing measurements EMC effect large x, allow more detailed examinations A effect.
We present new precision measurements of the elastic electron-proton scattering cross section for momentum transfer (Q^{2}) up to 15.75 (GeV/c)^{2}. Combined with existing data, these provide an improved extraction proton magnetic form factor at high Q^{2} and double range over which a longitudinal or transverse separation can be performed. The difference between our results polarization data agrees that observed lower attributed hard two-photon exchange (TPE) effects, extending 8...
The E12-14-012 experiment, performed in Jefferson Lab Hall A, has measured the (e,e'p) cross section parallel kinematics using a natural titanium target. Here, we report full results of analysis data set corresponding to beam energy 2.2 GeV, and spanning missing momentum range 15 <= pm 250 MeV/c 12 Em 80 MeV. reduced been with ~7% accuracy as function both energy. We compared our Monte Carlo simulations model spectral including effects final state interactions. overall agreement between is...
We report the first measurement of (e,e′p) three-body breakup reaction cross sections in helium-3 (3He) and tritium (3H) at large momentum transfer [⟨Q2⟩≈1.9 (GeV/c)2] xB>1 kinematics, where section should be sensitive to quasielastic (QE) scattering from single nucleons. The data cover missing momenta 40≤pmiss≤500 MeV/c that, QE limit with no rescattering, equals initial probed nucleon. measured are compared state-of-the-art ab initio calculations. Overall good agreement, within ±20%, is...
A mass spectroscopy experiment with a pair of nearly identical high-resolution spectrometers and tritium target was performed in Hall at Jefferson Lab. Utilizing the (e,e′K+) reaction, enhancements, which may correspond to possible Λnn resonance ΣNN states, were observed an energy resolution about 1.21 MeV (σ), although greater statistics are needed make definitive identifications. An experimentally measured state provide unique constraint determining Λn interaction, for no scattering data...
We report the first measurement of $(e,e'p)$ reaction cross-section ratios for Helium-3 ($^3$He), Tritium ($^3$H), and Deuterium ($d$). The covered a missing momentum range $40 \le p_{miss} 550$ MeV$/c$, at large transfer ($\langle Q^2 \rangle \approx 1.9$ (GeV$/c$)$^2$) $x_B>1$, which minimized contributions from non quasi-elastic (QE) mechanisms. data is compared with plane-wave impulse approximation (PWIA) calculations using realistic spectral functions distributions. measured...
The E12-14-012 experiment performed at Jefferson Lab Hall A has collected inclusive electron-scattering data for different targets the kinematics corresponding to beam energy 2.222 GeV and scattering angle 15.54 deg. Here we present a comprehensive analysis of compare double-differential cross sections electrons, extracted using solid (aluminum, carbon, titanium) closed argon-gas cell. extend over broad range transfer, where quasielastic interaction, Delta-resonance excitation, inelastic...
We report measurements of the exclusive neutral pion electroproduction cross section off protons at large values x_{B} (0.36, 0.48, and 0.60) Q^{2} (3.1 to 8.4 GeV^{2}) obtained from Jefferson Lab Hall A experiment E12-06-014. The corresponding structure functions dσ_{T}/dt+εdσ_{L}/dt, dσ_{TT}/dt, dσ_{LT}/dt, dσ_{LT^{'}}/dt are extracted as a function proton momentum transfer t-t_{min}. results suggest amplitude for transversely polarized virtual photons continues dominate throughout this...
The E12-14-012 experiment, performed in Jefferson Lab Hall A, has collected exclusive electron-scattering data (e,e$^\prime$p) parallel kinematics using natural argon and titanium targets. Here, we report the first results of analysis set corresponding to beam energy 2,222 MeV, electron scattering angle 21.5 deg, proton emission -50 deg. differential cross sections, measured with $\sim$4% uncertainty, have been studied as a function missing momentum, compared Monte Carlo simulations,...
Liquid xenon time projection chambers are promising detectors to search for neutrinoless double beta decay (0$\nu \beta \beta$), due their response uniformity, monolithic sensitive volume, scalability large target masses, and suitability extremely low background operations. The nEXO collaboration has designed a tonne-scale chamber that aims 0$\nu \beta$ of \ce{^{136}Xe} with projected half-life sensitivity $1.35\times 10^{28}$~yr. To reach this sensitivity, the design goal is $\leq$1\%...
$^{2}\mathrm{H}(e,e'p)n$ cross sections have been measured at 4-momentum transfers of $Q^{2} = 4.5 \pm 0.5$ (GeV/c)$^{2}$ over a range neutron recoil momenta, $p_{\mathrm{r}}$, reaching up to $\sim1.0$ GeV/c. The data were obtained fixed angles $\theta_{nq} 35^\circ$, $45^\circ$ and $75^{\circ}$ with respect the 3-momentum transfer $\vec q$. new agree well previous which reached $p_{\mathrm{r}}\sim500$ MeV/c. At 35^\circ$ $45^\circ$, final state interactions (FSI), meson exchange currents...
The electromagnetic form factors of the proton and neutron encode information on spatial structure their charge magnetization distributions. While measurements are relatively straightforward, lack a free target makes neutron’s more challenging sensitive to experimental or model-dependent uncertainties. Various experiments have attempted extract from scattering in deuterium, with different techniques providing different, sometimes large, systematic We present results novel measurement...
Neutrinoless double beta decay is one of the most sensitive probes for new physics beyond Standard Model particle physics. One isotopes under investigation <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mmultiscripts><a:mi>Xe</a:mi><a:mprescripts/><a:none/><a:mn>136</a:mn></a:mmultiscripts></a:math>, which would into <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mmultiscripts><b:mi>Ba</b:mi><b:mprescripts/><b:none/><b:mn>136</b:mn></b:mmultiscripts></b:math>. Detecting...
The ratio of the nucleon $F_2$ structure functions, $F_2^n/F_2^p$, is determined by MARATHON experiment from measurements deep inelastic scattering electrons $^3$H and $^3$He nuclei. was performed in Hall A Facility Jefferson Lab used two high resolution spectrometers for electron detection, a cryogenic target system which included low-activity tritium cell. data analysis novel technique exploiting mirror symmetry nuclei, essentially eliminates many theoretical uncertainties extraction...
The nuclear dependence of the inclusive inelastic electron scattering cross section (the EMC effect) has been measured for first time in $^{10}$B and $^{11}$B. Previous measurements effect $A \leq 12$ nuclei showed an unexpected dependence; $^{11}$B were to explore this region more detail. Results are presented $^9$Be, $^{10}$B, $^{11}$B, $^{12}$C at incident beam energy 10.6~GeV. boron isotopes was found be similar that $^9$Be $^{12}$C, yielding almost no range $A=4-12$. This represents...
The small binding energy of the hypertrition leads to predictions non-existence bound hypernuclei for isotriplet three-body systems such as $nn\Lambda$. However, invariant mass spectroscopy at GSI has reported events that may be interpreted $nn\Lambda$ state. state was sought by missing-mass via $(e,e'K^+)$ reaction Jefferson Lab's experimental Hall A. present experiment higher sensitivity $nn\Lambda$-state investigation in terms better precision a factor about three. analysis shown this...