V. M. Rodriguez
A5017721332- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Superconducting Materials and Applications
- Atomic and Molecular Physics
- Particle Accelerators and Free-Electron Lasers
- Advanced NMR Techniques and Applications
- Nuclear Physics and Applications
- Silicon and Solar Cell Technologies
- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Electronic and Structural Properties of Oxides
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Conducting polymers and applications
- Advanced Chemical Physics Studies
- Magnetic confinement fusion research
- Thin-Film Transistor Technologies
- Advanced Data Storage Technologies
- Atomic and Subatomic Physics Research
- Ferroelectric and Piezoelectric Materials
- Photosynthetic Processes and Mechanisms
- Inorganic Fluorides and Related Compounds
- Semiconductor materials and devices
Ana G. Mendez University System
2021-2024
University of Houston
2008-2021
The University of Texas at El Paso
2019-2021
University of Life Sciences in Poznań
2018
Universidad Metropolitana
2009-2016
Universidad del Valle
2014
International Center for Tropical Agriculture
2014
Tohoku University
2013
DEVCOM Army Research Laboratory
2011
William & Mary
2005
New Jefferson Lab data are presented on the nuclear dependence of inclusive cross section from $^{2}\mathrm{H}$, $^{3}\mathrm{He}$, $^{4}\mathrm{He}$, $^{9}\mathrm{Be}$ and $^{12}\mathrm{C}$ for $0.3<x<0.9$, ${Q}^{2}\ensuremath{\approx}3--6\text{ }\text{ }{\mathrm{GeV}}^{2}$. These represent first measurement EMC effect $^{3}\mathrm{He}$ at large $x$ a significant improvement $^{4}\mathrm{He}$. The do not support previous $A$-dependent or density-dependent fits to suggest that quark...
This report summarizes the work of Energy Frontier Higgs Boson working group 2013 Community Summer Study (Snowmass). We identify key elements a precision physics program and document potential future experimental facilities as elucidated during Snowmass study. study couplings to gauge boson fermion pairs, double production for self-coupling, its quantum numbers $CP$-mixing in couplings, mass total width, prospects direct searches additional bosons extensions Standard Model. Our includes...
We present new measurements of electron scattering from high-momentum nucleons in nuclei. These data allow an improved determination the strength two-nucleon correlations for several nuclei, including light nuclei where clustering effects can, first time, be examined. The also include kinematic region three-nucleon are expected to dominate.
An experiment with a newly developed high-resolution kaon spectrometer (HKS) and scattered electron novel configuration was performed in Hall C at Jefferson Lab (JLab). The ground state of neutron-rich hypernucleus, He 7 Lambda, observed for the first time (e,e'K+) reaction an energy resolution ~0.6 MeV. This is best reported to date hypernuclear spectroscopy. he Lambda binding supplies last missing information A=7, T=1 iso-triplet, providing new input charge symmetry breaking (CSB) effect...
Spectroscopy of a $^{10}_{\Lambda}$Be hypernucleus was carried out at JLab Hall C using the $(e,e^{\prime}K^{+})$ reaction. A new magnetic spectrometer system (SPL+HES+HKS), specifically designed for high resolution hypernuclear spectroscopy, used to obtain an energy spectrum with 0.78 MeV (FWHM). The well-calibrated present experiment $p(e,e^{\prime}K^{+})\Lambda,\Sigma^{0}$ reactions allowed us determine levels, and binding ground state peak (mixture 1$^{-}$ 2$^{-}$ states) obtained be...
The 1H(e,e′π+)n cross section was measured for arange of four-momentum transfer up to Q2=3.91GeV2 at values the invariant mass W above resonance region. Q2 dependence longitudinal component found be consistent with Q2-scaling prediction hard exclusive processes. This suggests that QCD factorization theorem is applicable rather low Q2. transverse term falls off slower than naive Q−8 expectation and remains appreciable even Q2=3.91GeV2.Received 12 July...
We present results from a high precision experimental study of the nuclear modification longitudinal ($F_L$) to transverse ($F_1$) structure function ratio for bound nucleons in resonance region. The inclusive electron scattering cross sections were measured Jefferson Lab Experimental Hall C on carbon and deuterium nuclei large range kinematics, allowing separations functions be performed at four-momentum transfer values $0.5 \le Q^2 \le$ 3.75~GeV$^2$. In contrast significant body...
To better understand the impact of ethnic identity, it is important to examine people’s social construction, or definition, that identity. In this study, construction identity predominantly low-acculturated, first-and second-generation U.S. Mexicans and Mexican Americans was examined by asking focus group participants talk about what meant them be members their groups. These open-ended responses then were coded along Phinney’s aspects ethnicity. Several interesting patterns emerged, some...
Since the pioneering experiment, E89-009 studying hypernuclear spectroscopy using $(e,e^{\prime}K^+)$ reaction was completed, two additional experiments, E01-011 and E05-115, were performed at Jefferson Lab. These later experiments used a modified experimental design, "tilt method", to dramatically suppress large electromagnetic background, allowed for substantial increase in luminosity. Additionally, new kaon spectrometer, HKS (E01-011), electron HES, splitting magnet added produce...
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.
An experiment measuring electroproduction of hypernuclei has been performed in hall A at Jefferson Lab on a 12C target. In order to increase counting rates and provide unambiguous kaon identification two superconducting septum magnets ring imaging Cherenkov detector were added the standard equipment. unprecedented energy resolution less than 700 keV FWHM achieved. Thus, observed (Lambda)(12)B spectrum shows for first time identifiable strength core-excited region between ground-state s-wave...
An experimental study of the (16)O(e,e'K(+))(Lambda)(16)N reaction has been performed at Jefferson Lab. A thin film falling water was used as a target. This permitted simultaneous measurement p(e,e'K(+))Lambda, Sigma(0) exclusive reactions and precise calibration energy scale. ground-state binding 13.76+/-0.16 MeV obtained for (Lambda)(16)N with better precision than previous measurements on mirror hypernucleus (Lambda)(16)O. Precise energies have determined peaks arising from Lambda in s p...
The missing mass spectroscopy of the $^{7}_{\Lambda}$He hypernucleus was performed, using $^{7}$Li$(e,e^{\prime}K^{+})^{7}_{\Lambda}$He reaction at Thomas Jefferson National Accelerator Facility Hall C. $\Lambda$ binding energy ground state (1/2$^{+}$) determined with a smaller error than that previous measurement, being $B_{\Lambda}$ = 5.55 $\pm$ 0.10(stat.) 0.11(sys.) MeV. experiment also provided new insight into charge symmetry breaking in p-shell hypernuclear systems. Finally, peak 3.65...
In the absence of accurate data on free two-body hyperon-nucleon interaction, spectra hypernuclei can provide information details effective interaction. Electroproduction hypernucleus Lambda-9Li has been studied for first time with sub-MeV energy resolution in Hall A at Jefferson Lab a 9Be target. order to increase counting rate and unambiguous kaon identification, two superconducting septum magnets Ring Imaging CHerenkov detector (RICH) were added standard equipment. The cross section...
Abstract The aim of this study was to track the changes in blood parameters mid-lactation multiparous Polish Holstein-Friesian cows response a diet supplemented with mixture fish-soybean oils blend and tannin-containing lingonberry shrub (Vaccinium vitis idaea; VVI) extract. Twelve lactating were randomly assigned crossover design two treatments (6 per treatment) which consisted control containing no supplement (CON) CON 99 g VVI leaves extract 660 blended (MIX) daily. obtained results...
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 present new data on electron scattering from a range of nuclei taken in Hall C at Jefferson Lab. For heavy nuclei, we observe rapid falloff the cross section for x>1, which is sensitive to short-range contributions nuclear wave function, and deep inelastic corresponds probing extremely high momentum quarks. This result agrees with higher energy muon measurements, but sharp contrast neutrino measurements suggested dramatic enhancement distribution "superfast" quarks probed x>1. The x>1...
The experiment E94-107 in Hall A at Jefferson Lab started a systematic study of high-resolution hypernuclear spectroscopy the $0p$-shell region nuclei such as hypernuclei produced electroproduction on $^{9}\mathrm{Be},\phantom{\rule{0.16em}{0ex}}^{12}\mathrm{C}$, and $^{16}\mathrm{O}$ targets. In order to increase counting rates provide unambiguous kaon identification, two superconducting septum magnets ring-imaging Cherenkov detector were added standard equipment. high-quality beam, good...
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...
A search was made for sub-threshold J/ψ production from a carbon target by using mixed real and quasireal Bremsstrahlung photon beam with an endpoint energy of 5.76 GeV. No events were observed, which is consistent predictions under the assumption quasifree production. The results place limits on exotic mechanisms that strongly enhance production.Received 16 September 2008DOI:https://doi.org/10.1103/PhysRevC.79.015209©2009 American Physical Society