N. Meyners
A5045225912- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Advanced NMR Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Medical Imaging Techniques and Applications
- Nuclear physics research studies
- Radiation Therapy and Dosimetry
- Photocathodes and Microchannel Plates
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Advanced X-ray Imaging Techniques
- Atomic and Molecular Physics
- CCD and CMOS Imaging Sensors
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Magnetic confinement fusion research
- Neutrino Physics Research
- Life Cycle Costing Analysis
- Adrenal and Paraganglionic Tumors
Deutsches Elektronen-Synchrotron DESY
1995-2024
Hamburg Institut (Germany)
2010
University of Bonn
2008
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
1998-2007
Istituto Nazionale di Fisica Nucleare
1998-2007
Health and Education Research Management and Epidemiologic Services (United States)
2001-2006
Hermes Arzneimittel (Germany)
2001-2006
Joint Institute for Nuclear Research
2006
University of Science and Technology of China
2006
Cornell University
2005
Single-spin asymmetries for semi-inclusive electroproduction of charged pions in deep-inelastic scattering positrons are measured the first time with transverse target polarization. The asymmetry depends on azimuthal angles both pion ($\ensuremath{\phi}$) and spin axis (${\ensuremath{\phi}}_{S}$) about virtual-photon direction relative to lepton plane. extracted Fourier component $\mathbf{⟨}\mathrm{sin}(\ensuremath{\phi}+{\ensuremath{\phi}}_{S}){\mathbf{⟩}}_{UT}^{\ensuremath{\pi}}$ is a...
Precise measurements of the spin structure functions proton ${g}_{1}^{p}(x,{Q}^{2})$ and deuteron ${g}_{1}^{d}(x,{Q}^{2})$ are presented over kinematic range $0.0041\ensuremath{\le}x\ensuremath{\le}0.9$ $0.18\text{ }\text{ }{\mathrm{GeV}}^{2}\ensuremath{\le}{Q}^{2}\ensuremath{\le}20\text{ }{\mathrm{GeV}}^{2}$. The data were collected at HERMES experiment DESY, in deep-inelastic scattering 27.6 GeV longitudinally polarized positrons off hydrogen deuterium gas targets internal to HERA storage...
The first observation of an azimuthal cross section asymmetry with respect to the charge incoming lepton beam is reported from a study hard exclusive electroproduction real photons. data have been accumulated by HERMES experiment at DESY, in which HERA 27.6 GeV electron or positron scattered off unpolarized hydrogen gas target. observed attributed interference between Bethe-Heitler process and deeply virtual Compton scattering (DVCS) process. term sensitive DVCS amplitudes, provide most...
A measurement of the beam-spin asymmetry in azimuthal distribution pions produced semi-inclusive deep-inelastic scattering off protons is presented. The was performed using {HERMES} spectrometer with a hydrogen gas target and longitudinally polarized 27.6 GeV positron beam HERA. sinusoidal amplitude dependence on angle $\phi$ hadron production plane around virtual photon direction relative to lepton measured for $\pi^+,\pi^-$ $\pi^0$ mesons. this Bjorken scaling variable pion fractional...
Exclusive coherent and incoherent electroproduction of the rho(0) meson from 1H 14N targets has been studied at HERMES experiment as a function coherence length (l(c)), corresponding to lifetime hadronic fluctuations virtual photon, squared four-momentum photon (-Q2). The ratio cross sections per nucleon, called nuclear transparency, was found increase (decrease) with increasing l(c) for (incoherent) electroproduction. For fixed l(c), rise transparency Q2 is observed both production, which...
The first measurements of double-hadron production in deep-inelastic scattering within the nuclear medium were made with HERMES spectrometer at DESY HERA using a 27.6 GeV positron beam. By comparing data for deuterium, nitrogen, krypton, and xenon nuclei, influence on ratio to single-hadron yields was investigated. Nuclear effects additional hadron are clearly observed, but little or no difference among xenon, smaller magnitude than seen previously measured multiplicities. compared models...
The HERMES experiment has measured the transverse polarization of $\ensuremath{\Lambda}$ and $\overline{\ensuremath{\Lambda}}$ hyperons produced inclusively in quasireal photoproduction at a positron beam energy 27.6 GeV. ${P}_{\mathrm{n}}^{\ensuremath{\Lambda}}$ hyperon is found to be positive while observed compatible with zero. values averaged over kinematic acceptance are...
Abstract Lightweight structures are widely used across different industry sectors. However, they get easily excited by external influences, such as vibrations. Undesired high vibration amplitudes can be avoided shifting the structural eigenfrequencies, which achieved adapting design considering optimisation procedures and primarily inspired diatoms. This has been applied to development process of a girder structure installed in synchrotron radiation facility support heavy magnets other...
A Fabry-Perot cavity polarimeter, installed in 2003 at HERA for the second phase of its operation, is described. The polarimeter was designed to measure longitudinal polarisation electron beam with high precision each bunch spaced a time interval 96ns. Within laser intensity routinely enhanced up few kW from original value 0.7W stable and controllable way. By interacting such it possible relative statistical 2% per minute. Detailed systematic studies have also been performed resulting uncertainty 1%.