A. Khoukaz
A5031565165- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Computational Physics and Python Applications
- Advanced NMR Techniques and Applications
- Particle Detector Development and Performance
- Atomic and Molecular Physics
- Particle Accelerators and Free-Electron Lasers
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Radiation Detection and Scintillator Technologies
- Scientific Research and Discoveries
- Advanced Chemical Physics Studies
- Particle accelerators and beam dynamics
- advanced mathematical theories
- X-ray Spectroscopy and Fluorescence Analysis
- Laser-induced spectroscopy and plasma
- Distributed and Parallel Computing Systems
University of Münster
2016-2025
Institute of High Energy Physics
2018-2024
Henan University
2023
Inner Mongolia University
2023
University of Groningen
2023
Hunan University
2022
Boğaziçi University
2022
Uppsala University
1998-2020
University of Science and Technology of China
2020
Max Planck Institute for Nuclear Physics
2001-2018
We report on an exclusive and kinematically complete high-statistics measurement of the basic double-pionic fusion reaction pn→dπ(0)π(0) over full energy region ABC effect, a pronounced low-mass enhancement in ππ-invariant mass spectrum. The measurements, which cover also transition to conventional t-channel ΔΔ process, were performed with upgraded WASA detector setup at COSY. data reveal Abashian-Booth-Crowe effect be uniquely correlated Lorentzian dependence integral cross section....
Exclusive and kinematically complete high-statistics measurements of quasifree polarized $\stackrel{\ensuremath{\rightarrow}}{n}p$ scattering have been performed in the energy region narrow resonancelike structure ${d}^{*}$ with $I({J}^{P})=0({3}^{+})$, $M\ensuremath{\approx}2380\text{ }\text{ }\mathrm{MeV}$, $\mathrm{\ensuremath{\Gamma}}\ensuremath{\approx}70\text{ }\mathrm{MeV}$ observed recently double-pionic fusion channels...
The differential and total cross sections for the dp→3Heη reaction have been measured in a high precision statistics COSY-ANKE experiment near threshold using continuous beam energy ramp up to an excess Q of 11.3 MeV with essentially 100% acceptance. kinematics allowed mean value be determined about 9 keV. Evidence is found effects higher partial waves Q≳4 MeV. very rapid rise section its maximum within 0.5 implies large η3He scattering length hence presence quasibound state extremely close...
The pp→pK+Y0 reaction has been studied for hyperon masses m(Y0)⩽1540MeV/c2 at COSY-Jülich by using a 3.65 GeV/c circulating proton beam incident on an internal hydrogen target. Final states comprising two protons, one positively charged kaon and negatively pion have identified with the ANKE spectrometer. Such configurations are sensitive to production of ground state Λ Σ0 hyperons as well Σ0(1385) Λ(1405) resonances. Applying invariant- missing-mass techniques, overlapping excited could be...
Total and differential cross sections for the dp→He3η reaction have been measured near threshold He3 center-of-mass momenta in range from 17.1 MeV/c to 87.5 MeV/c. The data were taken during a slow ramping of COSY internal deuteron beam scattered on proton target detecting ejectiles with COSY-11 facility. forward–backward asymmetries deviate clearly zero above 50 indicating presence higher partial waves final state. Below fit state enhancement factor total results He3–η scattering length...
Exclusive measurements of the quasifree $pn\ensuremath{\rightarrow}pp{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}$ reaction have been performed by means $pd$ collisions at ${T}_{p}$ $=$ 1.2 GeV using wide angle shower apparatus (WASA) detector setup cooler synchrotron COSY (Institut f\"ur Kernphysik, J\"ulich). Total and differential cross sections obtained covering energy region $\sqrt{s}$ (2.35--2.46) GeV, which includes ABC effect its associated resonance structure. No...
New data on quasifree polarized neutron-proton scattering in the region of recently observed ${d}^{*}$ resonance structure are obtained by exclusive and kinematically complete high-statistics measurements with WASA at COSY. This paper details determination beam polarization, checks character process, all ${A}_{y}$ angular distributions new partial-wave analysis, which includes producing a pole ${}^{3}{D}_{3}\ensuremath{-}{}^{3}{G}_{3}$ coupled partial waves...
Exclusive measurements of the quasi-free $np \to np\pi^0\pi^0$ reaction have been performed by means $dp$ collisions at $T_d$ = 2.27 GeV using WASA detector setup COSY. Total and differential cross sections obtained covering energy region $\sqrt s$ (2.35 - 2.46) GeV, which includes ABC effect its associated $d^*(2380)$ resonance. Adding $d^*$ resonance amplitude to that for conventional processes leads a reasonable description data. The observed in total section is agreement with predictions...
A new method to determine the spin tune is described and tested. In an ideal planar magnetic ring, tune-defined as number of precessions per turn-is given by ν(s)=γG (γ Lorentz factor, G gyromagnetic anomaly). At 970 MeV/c, deuteron spins coherently precess at a frequency ≈120 kHz in Cooler Synchrotron COSY. The deduced from up-down asymmetry deuteron-carbon scattering. time interval 2.6 s, was determined with precision order 10^{-8}, 1×10^{-10} for continuous 100 s accelerator cycle. This...
We observe a deuteron beam polarization lifetime near 1000 s in the horizontal plane of magnetic storage ring (COSY). This long spin coherence time is maintained through combination bunching, electron cooling, sextupole field corrections, and suppression collective effects current limits. record required for search an intrinsic electric dipole moment on at statistical sensitivity level approaching 10^{-29} e cm.
An exclusive measurement of the excitation function for dd->3Heppi- reaction was performed at Cooler Synchrotron COSY-Juelich with WASA-at-COSY detection system. The data were taken during a slow acceleration beam from 2.185 GeV/c to 2.400 crossing kinematic threshold eta meson production in dd->4He-eta 2.336 GeV/c. corresponding excess energy respect 4He-eta system varied -51.4MeV 22MeV. integrated luminosity experiment determined using dd->3Hen reaction. shape examined. No signal bound...
Taking advantage of both the high mass resolution COSY-11 detector and energy low-emittance proton beam cooler synchrotron COSY, we determine excitation function for pp→ppη(') reaction close to threshold. Combining these data with previous results, extract scattering length η(')-proton potential in free space be Re(a(pη(')))=0±0.43 fm Im(a(pη(')))=0.37(-0.16)(+0.40) fm.
The quasifree $p+n\ensuremath{\rightarrow}d+\ensuremath{\eta}$ reaction cross section has been measured at the threshold using 1295 MeV protons in CELSIUS storage ring and an internal cluster-jet deuterium target. kinematics is chosen such that target proton can be assumed to a spectator. Fermi momentum of neutron used extract energy dependence by reconstructing on event-by-event basis. data cover excess energies from 10 center mass final $d\ensuremath{\eta}$ system. Approaching enhanced...
The $\mathrm{pp}\ensuremath{\rightarrow}\mathrm{pp}{\ensuremath{\eta}}^{\ensuremath{'}}(958)$ reaction has been measured at the cooler synchrotron COSY J\"ulich using internal beam and COSY-11 facility. total cross sections four different excess energies $Q\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.5,1.7,2.9$, $4.1\mathrm{MeV}$ have evaluated to be...