M. L. Kabir
A5014414838- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Nuclear reactor physics and engineering
- Advanced NMR Techniques and Applications
- Stochastic processes and statistical mechanics
- X-ray Spectroscopy and Fluorescence Analysis
- Scheduling and Optimization Algorithms
- Quantum many-body systems
- Scientific Research and Discoveries
- Physics of Superconductivity and Magnetism
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Manufacturing Process and Optimization
- Quantum and electron transport phenomena
- Fusion materials and technologies
- Flexible and Reconfigurable Manufacturing Systems
- Medical Imaging Techniques and Applications
- Plasma and Flow Control in Aerodynamics
University of Kentucky
2016-2024
Brookhaven National Laboratory
2024
University of California, Riverside
2020-2024
National Research and Innovation Agency
2024
National Nuclear Energy Agency of Indonesia
2024
Mississippi State University
2018-2023
Argonne National Laboratory
2017-2023
Al-Zaytoonah University of Jordan
2023
Shandong University
2023
Technical University of Darmstadt
2023
We measured the triple coincidence A(e,e'np) and A(e,e'pp) reactions on carbon, aluminum, iron, lead targets at Q2 > 1.5 (GeV/c)2, xB 1.1 missing momentum 400 MeV/c. This was first direct measurement of both proton-proton (pp) neutron-proton (np) short-range correlated (SRC) pair knockout from heavy asymmetric nuclei. For all nuclei, average to reduced cross-section ratio is about 6%, in agreement with previous indirect measurements. Correcting for Single-Charge Exchange effects decreased...
Short-range correlated (SRC) nucleon pairs are a vital part of the nucleus, accounting for almost all nucleons with momentum greater than Fermi (${k}_{F}$). A fundamental characteristic SRC is having large relative momenta as compared to ${k}_{F}$, and smaller center mass (c.m.) which indicates small separation distance between in pair. Determining c.m. distribution essential understanding their formation process. We report here on extraction motion proton-proton ($pp$) carbon and, first...
We present the quantum simulation of frustrated spin-<a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mfrac><a:mn>1</a:mn><a:mn>2</a:mn></a:mfrac></a:math> antiferromagnetic Heisenberg spin chain with competing nearest-neighbor <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:mo>(</b:mo><b:msub><b:mi>J</b:mi><b:mn>1</b:mn></b:msub><b:mo>)</b:mo></b:mrow></b:math> and next-nearest-neighbor <c:math...
Quasielastic $^{12}$C$(e,e'p)$ scattering was measured at space-like 4-momentum transfer squared $Q^2$~=~8, 9.4, 11.4, and 14.2 (GeV/c)$^2$, the highest ever achieved to date. Nuclear transparency for this reaction extracted by comparing yield that expected from a plane-wave impulse approximation calculation without any final state interactions. The consistent with no $Q^2$ dependence, up proton momenta of 8.5~GeV/c, ruling out quantum chromodynamics effect color scales in exclusive...
We report the first measurements of deep inelastic scattering spin-dependent azimuthal asymmetries in back-to-back dihadron electroproduction process. In this reaction, two hadrons are produced opposite hemispheres along z axis virtual photon-target nucleon center-of-mass frame, with hadron current-fragmentation region and second target-fragmentation region. The data were taken longitudinally polarized electron beams 10.2 10.6 GeV incident on an unpolarized liquid-hydrogen target using...
Deeply virtual Compton scattering (DVCS) allows one to probe generalized parton distributions describing the 3D structure of nucleon. We report first measurement DVCS beam-spin asymmetry using CLAS12 spectrometer with a 10.2 and 10.6 GeV electron beam from unpolarized protons. The results greatly extend Q^{2} Bjorken-x phase space beyond existing data in valence region provide 1600 new points measured unprecedented statistical uncertainty, setting new, tight constraints for future...
We report the first observation of parity-violating 2.2 MeV gamma-ray asymmetry $A^{np}_\gamma$ in neutron-proton capture using polarized cold neutrons incident on a liquid parahydrogen target at Spallation Neutron Source Oak Ridge National Laboratory. isolates $\Delta I=1$, \mbox{$^{3}S_{1}\rightarrow {^{3}P_{1}}$} component weak nucleon-nucleon interaction, which is dominated by pion exchange and can be directly related to single coupling constant either DDH meson model or pionless EFT....
We measured the g_{1} spin structure function of deuteron at low Q^{2}, where QCD can be approximated with chiral perturbation theory (χPT). The data cover resonance region, up to an invariant mass W≈1.9 GeV. generalized Gerasimov-Drell-Hearn sum, moment Γ_{1}^{d} and polarizability γ_{0}^{d} are precisely determined down a minimum Q^{2} 0.02 GeV^{2} for first time, about 2.5 times lower than that previous data. compare them several χPT calculations models. These results in program benchmark...
We report the first experimental measurements of nine 1-fold differential cross sections for $\gamma p \to \pi^+\pi^-p$ reaction, obtained with CLAS detector at Jefferson Laboratory. The cover invariant mass range final state hadrons from 1.6~GeV~$<W<$~2.0~GeV. For time photocouplings all prominent nucleon resonances in this have been extracted exclusive channel. Photoproduction two charged pions is particular importance evaluation $\Delta(1620)1/2^-$, $\Delta(1700)3/2^-$, $N(1720)3/2^+$,...
In the past two decades, deeply virtual Compton scattering of electrons has been successfully used to advance our knowledge partonic structure free proton and investigate correlations between transverse position longitudinal momentum quarks inside nucleon. Meanwhile, bound nucleons in nuclei studied inclusive deep-inelastic lepton experiments off nuclear targets, showing a significant difference distribution nucleon, known as EMC effect. this Letter, we report first beam spin asymmetry (BSA)...
The new experimental measurements of beam spin asymmetry were performed for the deeply virtual exclusive π0 production in a wide kinematic region with photon virtualities Q2 up to 6.6 GeV2 and Bjorken scaling variable xB valence regime. data collected by CEBAF Large Acceptance Spectrometer (CLAS12) at Jefferson Lab longitudinally polarized 10.6 GeV electrons scattered on an unpolarized liquid-hydrogen target. Sizable values indicate substantial contribution from transverse amplitudes...
We report on the first measurement of cross sections for exclusive deeply virtual pion electroproduction off proton, $e p \to e^\prime n \pi^+$, above resonance region at backward center-of-mass angles. The $\varphi^*_{\pi}$-dependent were measured, from which we extracted three combinations structure functions proton. Our results are compatible with calculations based nucleon-to-pion transition distribution amplitudes (TDAs) and shed new light nucleon structure.
Exclusive photoproduction cross sections have been measured for the process $\ensuremath{\gamma}p\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{0}[{e}^{+}{e}^{\ensuremath{-}}(\ensuremath{\gamma})]$ with Dalitz decay final state using tagged photon energies in range of ${E}_{\ensuremath{\gamma}}=1.275--5.425$ GeV. The complete angular distribution ${\ensuremath{\pi}}^{0}$, entire energy up to large values $t$ and $u$, has first time. data obtained show that section $d\ensuremath{\sigma}/dt$, at...
We report results of Λ hyperon production in semi-inclusive deep-inelastic scattering off deuterium, carbon, iron, and lead targets obtained with the CLAS detector Continuous Electron Beam Accelerator Facility 5.014 GeV electron beam. These represent first measurements multiplicity ratio transverse momentum broadening as a function energy fraction (z) current target fragmentation regions. The exhibits strong suppression at high z an enhancement low z. measured is order magnitude greater than...
New results on the single-differential and fully-integrated cross sections for process $\gamma_{v} p \rightarrow p' \pi^{+} \pi^{-}$ are presented. The experimental data were collected with CLAS detector at Jefferson Laboratory. Measurements carried out in kinematic region of reaction invariant mass $W$ from 1.3 to 1.825 GeV photon virtuality $Q^2$ 0.4 1.0 GeV$^2$. obtained narrow $Q^{2}$ bins (0.05 GeV$^{2}$) smallest statistical uncertainties achieved double-pion electroproduction...
We report the first precision measurement of parity-violating asymmetry in direction proton momentum with respect to neutron spin, reaction ^{3}He(n,p)^{3}H, using capture polarized cold neutrons an unpolarized active ^{3}He target. The is a result weak interaction between nucleons, which remains one least well-understood aspects electroweak theory. provides important benchmark for modern effective field theory and potential model calculations. Measurements like this are necessary determine...
$^{2}\mathrm{H}(e,e'p)n$ 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...
This paper reports the measurement of polarized and unpolarized cross sections for ep -> e'p' reaction, which is comprised Deeply Virtual Compton Scattering (DVCS) Bethe-Heitler (BH) processes, at an electron beam energy 5.88 GeV Thomas Jefferson National Accelerator Facility using Large Acceptance Spectrometer CLAS. The section differences have been measured over broad kinematics, 0.10 < x_B 0.58, 1.0 Q^2 4.8 GeV^2, 0.09 -t 2.00 GeV^2. results are found to be consistent with previous CLAS...
We report on the measurement of beam spin asymmetry in deeply virtual Compton scattering off $^4$He using CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab a 6 GeV longitudinally polarized electron incident pressurized gaseous target. detail method used to ensure exclusivity measured reactions, particular upgrade CLAS with radial time projection chamber detect low-energy recoiling nuclei and an inner calorimeter extend photon detection acceptance forward angles. Our results confirm...