S. Lopez-Ponte
A5000466351- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Advanced NMR Techniques and Applications
- Muon and positron interactions and applications
- Metabolomics and Mass Spectrometry Studies
- Spectroscopy and Chemometric Analyses
- Dark Matter and Cosmic Phenomena
- Spectroscopy and Laser Applications
- Computational Drug Discovery Methods
- Radiation Therapy and Dosimetry
- Particle Accelerators and Free-Electron Lasers
- Molecular spectroscopy and chirality
- Superconducting Materials and Applications
- NMR spectroscopy and applications
- Gyrotron and Vacuum Electronics Research
- Analytical Chemistry and Chromatography
- Nuclear physics research studies
- Nuclear reactor physics and engineering
- Advanced MRI Techniques and Applications
- Chemical Thermodynamics and Molecular Structure
- Computational Physics and Python Applications
University of Houston
1993-1996
Universidade de Santiago de Compostela
1994-1996
U.S. National Science Foundation
1995
Bielefeld University
1994
Universidad de Santiago de Chile
1993-1994
Centre National de la Recherche Scientifique
1992
Institut National de Physique Nucléaire et de Physique des Particules
1992
University of York
1991
We present a new measurement of the spin-dependent structure function g1d deuteron in deep inelastic scattering 190 GeV polarised muons on deuterons, kinematic range 0.003 < x 0.7 and 1 GeV2 Q2 60 GeV2. This is found to be negative at small x. The first moment Γ1d=∫01g1ddx evaluated Q02 = 10 0.034 ± 0.009 (stat.) 0.006 (syst.). value below Ellis-Jaffe sum rule prediction by three standard deviations. Using our earlier determination Γ1p, we obtain Γ1p − Γ1n 0.199 0.038 which agrees with Bjorken rule.
We measured the spin asymmetry in scattering of 100 GeV longitudinally-polarized muons on transversely polarized protons. The was found to be compatible with zero kinematic range 0.006 < x 0.6, 1 Q2 30GeV2. From this result we derive upper limits for virtual photon-proton A2, and structure function g2. For 0.15, A2 is significantly smaller than its positivity limit √R.
A muon beam polarimeter has been built for the SMC experiment at CERN SPS, energies of 100 to 200 GeV. The polarisation is determined from energy spectrum positrons decay μ+ → e+ νcνμ. − 0.82 measured with a relative systematic accuracy 3%.
This study reports a deep learning approach that utilises message passing neural networks (MPNNs) for predicting chemical shifts in
We report a large enhancement of 1.7 in deuteron polarization up to values 0.6 due frequency modulation the polarizing microwaves two liters polarized target using method dynamic nuclear polarization. This was used during deep inelastic muon-deuteron scattering experiment at CERN. Measurements electron paramagnetic resonance absorption spectra show that gives rise additional microwave spectral wings. Although these results are not understood theoretically, they may provide useful testing...
The 10-probe NMR system for measuring the polarization in deuterated butanol target of Spin Muon Collaboration is presented. It calibrated by determining integrated spectrum thermal equilibrium at 1 K. Thermal stabilization and control electromagnetic interference were effective reducing drift electronic noise, so that high quality signals obtained. calibration constant was determined with a reproducibility 2%. Systematic effects circuit magnetic field shift have been studied. resulting 4.4%...
To assess the knocking properties of natural gas (NG) when it is used as fuel for vehicles vital to optimize design and functioning their motors. Analytical efforts in this field are needed engines define empirically not available anymore, existent mathematical algorithms yield different accuracy. The hybridization gas-phase infrared spectrometry partial least squares multivariate regression presented first time address determination methane number (MN) NG samples. It circumvents need...
Abstract In many branches of physics, the time evolution various quantities measured in systems passing from excited to equilibrium states, while theoretically very complex, can be practice well approximated by a sum exponential decays. Multiexponential relaxometry data analysis is about determining number components and their corresponding amplitudes decay rates, starting noisy recorded series, under assumption discreteness present. A technique for decomposing signal modelled as decays into...
Central rapidity Λ production has been measured in sulfur collisions with Cu, Ag, and Pb at 200 GeV/c per nucleon. Lambdas produced these were identified by their charged decays recorded a time projection chamber. The yields are compared as function of target mass. For each target, the reported transverse kinetic energy zero degree (a measure collision centrality). In system, data exceed predictions venus size-2(4.02) model sulfur-nucleus collisions. observed excesses show no obvious...