A5038694989- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Advanced NMR Techniques and Applications
- Atomic and Molecular Physics
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Cold Atom Physics and Bose-Einstein Condensates
- Cancer-related molecular mechanisms research
- Particle accelerators and beam dynamics
- Facial Nerve Paralysis Treatment and Research
- Muon and positron interactions and applications
- RNA Interference and Gene Delivery
- Geomagnetism and Paleomagnetism Studies
- RNA modifications and cancer
- Lung Cancer Treatments and Mutations
- Computational Physics and Python Applications
- Analytical Chemistry and Chromatography
Triangle Universities Nuclear Laboratory
2015-2024
Duke University
2015-2024
Southeast University
2024
Tsinghua University
2012-2024
University of Chinese Academy of Sciences
2019-2024
University of California, Riverside
2024
Chinese Academy of Sciences
2019-2024
Zhejiang Cancer Hospital
2024
Shanxi Agricultural University
2024
Brookhaven National Laboratory
2023
The proton is responsible for about half the mass in our personal lives. So it perhaps surprising that little known how got here or bound from its fundamental quark and gluon constituents. This uncertainty largest source of error to extracting some constants nature. One observable probes internal structure tests theoretical description charge radius. radius sensitive quantum electrodynamics chromodynamics helps constrain new physics. review presents current status among four types...
Results are reported from the HERMES experiment at HERA on a measurement of neutron spin structure function $g_1^n(x,Q^2)$ in deep inelastic scattering using 27.5 GeV longitudinally polarized positrons incident $^3$He internal gas target. The data cover kinematic range $0.023
Single-spin asymmetries for semi-inclusive pion production in deep-inelastic scattering have been measured the first time. A significant target-spin asymmetry of distribution azimuthal angle straight phi relative to lepton plane was formed pi(+) electroproduction on a longitudinally polarized hydrogen target. The corresponding analyzing power sinstraight moment cross section is 0.022+/-0.005+/-0.003. This result can be interpreted as effect terms involving chiral-odd spin functions...
We present measurements of the ratio proton elastic electromagnetic form factors, μpGEp/GMp. The Jefferson Lab Hall A Focal Plane Polarimeter was used to determine longitudinal and transverse components recoil polarization in ep scattering; these is proportional two factors. These data reproduce observation Jones et al. [Phys. Rev. Lett. 84, 1398 (2000)], that factor decreases significantly from unity above Q2=1GeV2.Received 29 May 2001DOI:https://doi.org/10.1103/PhysRevC.64.038202©2001...
This White Paper presents the science case of an Electron-Ion Collider (EIC), focused on structure and interactions gluon-dominated matter, with intent to articulate it broader nuclear community. It was commissioned by managements Brookhaven National Laboratory (BNL) Thomas Jefferson Accelerator Facility (JLab) objective presenting a summary scientific opportunities goals EIC as follow-up 2007 NSAC Long Range plan. document is culmination community-wide effort in following series workshops...
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...
We report on measurements of the neutron spin asymmetries An1,2 and polarized structure functions gn1,2 at three kinematics in deep inelastic region, with x=0.33, 0.47, 0.60 Q2=2.7, 3.5, 4.8(GeV∕c)2, respectively. These were performed using a 5.7GeV longitudinally electron beam 3He target. The results for An1 gn1 x=0.33 are consistent previous world data and, two higher-x points, have improved precision by about an order magnitude. new show zero crossing around x=0.47 value x=0.60 is...
The flavor asymmetry of the light quark sea nucleon is determined in kinematic range $0.02<x<0.3$ and $1<{Q}^{2}<10{\mathrm{GeV}}^{2}$ for first time from semi-inclusive deep-inelastic scattering. quantity $[\overline{d}(x)\ensuremath{-}\overline{u}(x)]/[u(x)\ensuremath{-}d(x)]$ derived a relationship between yields positive negative pions unpolarized hydrogen deuterium targets. $\overline{d}\ensuremath{-}\overline{u}$ found to be nonzero $x$ dependent, showing an excess $\overline{d}$ over...
We have measured the neutron spin asymmetry A(n)(1) with high precision at three kinematics in deep inelastic region x=0.33, 0.47, and 0.60, Q(2)=2.7, 3.5, 4.8 (GeV/c)(2), respectively. Our results unambiguously show, for first time, that crosses zero around x=0.47 becomes significantly positive x=0.60. Combined world proton data, polarized quark distributions were extracted. results, general, agree relativistic constituent models perturbative quantum chromodynamics (PQCD) analyses based on...
Abstract Fast radio bursts (FRBs) are short pulses observed in band from cosmological distances, some of which emit repeating bursts. The physical origins these mysterious events have been subject to wide speculations and heated debates. One class models invoke soft gamma-ray repeaters (SGRs), or magnetars, as the sources FRBs. Magnetars rotating neutron stars with extremely strong magnetic field can sporadically X-ray (keV) (sub-MeV) duration 102 s 102 s. However, even though bright no...
Nucleon electromagnetic form factors are fundamental quantities related to the charge and magnetization distributions inside nucleon. Understanding nucleon structure in terms of underlying quark gluon degrees freedom quantum chromodynamics is a challenging urgent task. The have been studied past extensively unpolarized electron scattering experiments. With development polarized beam, recoil polarimetry, target technologies, polarization experiments provided more precise data on these...
The possible existence of short-range forces between unpolarized and polarized spin-1/2 particles has attracted the attention physicists for decades. These are predicted in various theories provide a new source parity (P) time reversal (T) symmetry violation. We use an ensemble 3He gas cell with 250 um thickness glass window to search force from scalar boson exchange over sub-millimeter ranges. This interaction would produce NMR frequency shift as mass is moved near far ensemble. report...
We report on analysis of observations the bright transient X-ray pulsar \src obtained during its 2017-2018 giant outburst with Insight-HXMT, \emph{NuSTAR}, and \textit{Swift} observatories. focus discovery a sharp state transition timing spectral properties source at super-Eddington accretion rates, which we associate disk to radiation pressure dominated (RPD) state, first ever directly observed for magnetized neutron star. This occurs slightly higher luminosity compared already reported...