E. Korkmaz
A5031585693- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Advanced NMR Techniques and Applications
- Quantum, superfluid, helium dynamics
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Electron and X-Ray Spectroscopy Techniques
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Particle Accelerators and Free-Electron Lasers
- X-ray Spectroscopy and Fluorescence Analysis
- Photocathodes and Microchannel Plates
- Radiation Detection and Scintillator Technologies
- Muon and positron interactions and applications
- Black Holes and Theoretical Physics
- Crystallography and Radiation Phenomena
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Radiation Therapy and Dosimetry
- Neutrino Physics Research
Erzincan Binali Yıldırım University
2023
Nagoya University
2023
University of Northern British Columbia
2011-2022
University of Manitoba
1990-2019
University of Saskatchewan
1998-2000
University of Alberta
1991-1998
Technical University of Munich
1998
TRIUMF
1990-1996
The University of Texas at Austin
1995
Simon Fraser University
1994
We have measured parity-violating asymmetries in elastic electron-proton scattering over the range of momentum transfers 0.12 < or =Q2 =1.0 GeV2. These asymmetries, arising from interference electromagnetic and neutral weak interactions, are sensitive to strange-quark contributions currents proton. The measurements were made at Jefferson Laboratory using a toroidal spectrometer detect recoiling protons liquid hydrogen target. results indicate nonzero, Q2 dependent, provide new information...
The Q(weak) experiment has measured the parity-violating asymmetry in ep elastic scattering at Q(2)=0.025(GeV/c)(2), employing 145 μA of 89% longitudinally polarized electrons on a 34.4 cm long liquid hydrogen target Jefferson Lab. results experiment's commissioning run, constituting approximately 4% data collected experiment, are reported here. From these initial results, is A(ep)=-279±35 (stat) ± 31 (syst) ppb, which smallest and most precise ever scattering. small Q(2) this made possible...
We installed a source for ultracold neutrons at new, dedicated spallation target TRIUMF. The was originally developed in Japan and uses superfluid-helium converter cooled to 0.9$\,$K. During an extensive test campaign November 2017, we extracted up 325000 after one-minute irradiation of the target, over three times more than previously achieved with this source. corresponding ultracold-neutron density whole production guide volume is 5.3$\,$cm$^{-3}$. storage lifetime initially 37$\,$s...
The forward--backward asymmetry in n p --> d pi^0, which must be zero the center-of-mass system if charge symmetry is respected, has been measured to [17.2 +/- 8 (stat) 5.5 (sys)] * 10^{-4}, at an incident neutron energy of 279.5 MeV. This breaking observable was extracted by fitting data with GEANT-based simulations and compared recent chiral effective field theory calculations, implications regarding value u quark mass difference.
We have measured the beam-normal single-spin asymmetry in elastic scattering of transversely polarized 3 GeV electrons from unpolarized protons at Q2=0.15, 0.25 (GeV/c)2. The results are inconsistent with calculations solely using nucleon intermediate state and generally agree significant inelastic hadronic contributions. A(n) provides a direct probe imaginary component 2gamma exchange amplitude, complete description which is important interpretation data precision electron-scattering experiments.
We report the first measurement of parity-violating elastic electron scattering asymmetry on ^{27}Al. The ^{27}Al is A_{PV}=2.16±0.11(stat)±0.16(syst) ppm, and was measured at ⟨Q^{2}⟩=0.02357±0.00010 GeV^{2}, ⟨θ_{lab}⟩=7.61°±0.02°, ⟨E_{lab}⟩=1.157 GeV with Q_{weak} apparatus Jefferson Lab. Predictions using a simple Born approximation as well more sophisticated distorted-wave calculations are in good agreement this result. From neutron radius R_{n}=2.89±0.12 fm determined many-models...
We have measured np\ensuremath{\rightarrow}d${\ensuremath{\pi}}^{0}$ cross sections at eleven beam energies within 16 MeV of threshold. Total are only 0.67\ifmmode\pm\else\textpm\fi{}0.10 the value which has been generally accepted for s-wave pion production strength near The differential anisotropic 1 (c.m.) above Our results compared to ${\ensuremath{\pi}}^{+}$d\ensuremath{\rightarrow}pp data and predictions two models.
Total and differential cross sections for the reaction ${}^{2}\mathrm{H}(\ensuremath{\gamma},{\ensuremath{\pi}}^{0})$ have been investigated within 20 MeV of threshold using tagged photon facility at SAL in conjunction with ${\ensuremath{\pi}}^{0}$ spectrometer IGLOO. The measurements are first to be reported region, while total section is a significant improvement over only previous measurement. We give determination electric dipole amplitude photoproduction from deuteron region....
We propose a new precision measurement of parity-violating electron scattering on the proton at very low Q^2 and forward angles to challenge predictions Standard Model search for physics. A unique opportunity exists carry out first proton's weak charge, $Q_W =1 - 4\sin^2θ_W$. 2200 hour parity violating asymmetry in elastic ep Q^2=0.03 (GeV/c)^2 employing 180 $μ$A 85% polarized beam 35 cm liquid Hydrogen target will determine charge with approximately 4% combined statistical systematic...
The double differential cross section for $\mathrm{pn}\ensuremath{\rightarrow}\mathrm{pp}{(}^{1}{S}_{0}){\ensuremath{\pi}}^{\ensuremath{-}}$ at three beam energies has been extracted from the quasifree process $\mathrm{pd}\ensuremath{\rightarrow}\mathrm{ppp}{\ensuremath{\pi}}^{\ensuremath{-}}$. A comparison is carried out with single measurements ${}^{3}\mathrm{He}({\ensuremath{\pi}}^{\ensuremath{-}},pn)n$, where pion thought to be absorbed onto a $\mathrm{pp}{(}^{1}{S}_{0})$ ``diproton''...
Differential cross sections for the $\ensuremath{\gamma}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}n$ reaction have been measured at photon energies 1 to 2 MeV above threshold using tagged-photon beams. The electric dipole amplitude ${E}_{0+}$ deduced is compared recent predictions from chiral perturbation theory. Constraints on value of $\ensuremath{\pi}N$ coupling constant are inferred by combining theory and experiment.
Cross sections for quasifree Compton scattering from the deuteron were measured incident energies of E(gamma) = 236-260 MeV at laboratory angle straight theta(gamma(')) -135 degrees. The recoil nucleons detected in a liquid-scintillator array situated theta(N) 20 differential cross used, with calculations Levchuk et al., to determine polarizabilities bound nucleons. For proton, extracted values consistent accepted value free proton. Combining our results neutron those Rose we obtain 1-sigma...
Analyzing powers for $\stackrel{\ensuremath{\rightarrow}}{p}n\ensuremath{\rightarrow}\mathrm{pp}(^{1}S_{0}){\ensuremath{\pi}}^{\ensuremath{-}}$ were measured at beam energies 353, 404, and 440 MeV by extracting the quasifree process from $\stackrel{\ensuremath{\rightarrow}}{p}d\ensuremath{\rightarrow}\mathrm{ppp}{\ensuremath{\pi}}^{\ensuremath{-}}$. Partial wave amplitude analysis yields a significant contribution isospin 1, $s$-wave channel. This is relatively much larger than that expected...
A beam-normal single-spin asymmetry generated in the scattering of transversely polarized electrons from unpolarized nucleons is an observable related to imaginary part two-photon exchange process. We report a 2% precision measurement elastic electron-proton with mean angle θ_{lab}=7.9° and energy 1.149 GeV. The result B_{n}=-5.194±0.067(stat)±0.082 (syst) ppm. This most precise this quantity available date therefore provides stringent test models at far-forward angles (θ_{lab}→0) where they...
We report measurements of the parity-conserving beam-normal single-spin elastic scattering asymmetries ${B}_{n}$ on $^{12}\mathrm{C}$ and $^{27}\mathrm{Al}$, obtained with an electron beam polarized transverse to its momentum direction. These add additional kinematic point a series previous provide first measurement $^{27}\mathrm{Al}$. The experiment utilized ${\mathrm{Q}}_{\mathrm{weak}}$ apparatus at Jefferson Lab energy 1.158 GeV. average laboratory angle for both targets was...
Charge symmetry breaking in np elastic scattering at 347 MeV has been measured with high precision. From fits of the asymmetry curves over angular range 53.4°≤θc.m.≤86.9°, difference center-of-mass zero-crossing angles analyzing powers was determined to be 0.438°±0.054°(stat)±0.051°(syst). Using experimentally slope power, dA/dθ=(−1.35±0.05)×10−2deg−1, this is equivalent ΔA=[59±7(stat)±7(syst)±2(syst)]×10−4. Predictions nucleon-nucleon interaction models based on meson exchange agree well...
The results of a comparative study the $^{13}(\mathit{p}\ensuremath{\rightarrow}$,${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$) and $^{12}(\mathit{p}\ensuremath{\rightarrow}$,${\ensuremath{\pi}}^{+}$) reactions at ${T}_{p}$=200 MeV 30\ifmmode^\circ\else\textdegree\fi{}\ensuremath{\le}${\ensuremath{\theta}}_{\mathrm{lab}{}^{\ensuremath{\pi}}\mathrm{\ensuremath{\le}}150\mathrm{\ifmmode^\circ\else\textdegree\fi{}}}$ are reported. isospin-dependence...
A Comment on the Letter by E. Piasetzky et al., Phys. Rev. Lett. 57, 2135 (1986).Received 10 November 1986DOI:https://doi.org/10.1103/PhysRevLett.58.840©1987 American Physical Society
A fast-switching, high-repetition-rate magnet and power supply have been developed for operated at TRIUMF, to deliver a proton beam the new ultracold neutron (UCN) facility. The facility possesses unique operational requirements: time-averaged current of 40~$\mu$A with ability switch on or off several minutes. These requirements are in conflict typical operation mode TRIUMF cyclotron which delivers nearly continuous multiple users. To enable creation UCN facility, beam-sharing arrangement...