P. Goslawski
A5077907899- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Advanced X-ray Imaging Techniques
- Quantum, superfluid, helium dynamics
- Gyrotron and Vacuum Electronics Research
- Advanced Electron Microscopy Techniques and Applications
- Advanced NMR Techniques and Applications
- Atomic and Molecular Physics
- Crystallography and Radiation Phenomena
- X-ray Spectroscopy and Fluorescence Analysis
- Gamma-ray bursts and supernovae
- Structural Analysis and Optimization
- Quantum and electron transport phenomena
- Nuclear Physics and Applications
- Electron and X-Ray Spectroscopy Techniques
- Magnetic properties of thin films
- Photonic and Optical Devices
- Muon and positron interactions and applications
- Nanofabrication and Lithography Techniques
Helmholtz-Zentrum Berlin für Materialien und Energie
2016-2024
University of Münster
2009-2020
Forschungszentrum Jülich
2015
Jagiellonian University
2014
Institute of Physics
2014
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...
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...
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...
In the quest for detailed spectroscopic insight into electronic structure at solid surfaces in a large momentum range, we have developed an advanced experimental approach. It combines 3D detection scheme of time-of-flight microscope with optimized filling pattern BESSY II storage ring. Here, comprehensive data sets covering full surface Brillouin zone been used to study faint substrate-film hybridization effects graphene on Ir(111), revealed by pronounced linear dichroism angular...
The deuteron tensor analysing power T20 of the d→p→He3η reaction has been measured at COSY-ANKE facility in small steps excess energy Q up to Q=11 MeV. Despite square production amplitude varying by over a factor five through this range, shows little dependence. This is evidence that final state interaction causing variation not influenced spin configuration entrance channel. weak angular dependence observed for provides useful insight into structure near threshold.
Exclusive and kinematically complete measurements of the double pionic fusion to ${}^{3}\mathrm{He}$ have been performed in energy region so-called ABC effect, which denotes a pronounced low-mass enhancement $\ensuremath{\pi}\ensuremath{\pi}$-invariant mass spectrum. The experiments were carried out with WASA detector setup at COSY (the cooler synchrotron Forschungszentrum J\"ulich). Similar observations basic $pn\ensuremath{\rightarrow}d{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ reaction...
Exclusive and kinematically complete high-statistics measurements of the double pionic fusion reaction $dd \to ^4$He$\pi^0\pi^0$ have been performed in energy range 0.8 - 1.4 GeV covering thus region ABC effect, which denotes a pronounced low-mass enhancement $\pi\pi$-invariant mass spectrum. The experiments were carried out with WASA detector setup at COSY. Similar to observation basic $pn d \pi^0\pi^0$ reaction, data reveal correlation between effect resonance-like dependence total cross...
The small time gaps of synchrotron radiation in conventional multi-bunch mode (100-500 MHz) or laser-based sources with high pulse rate (∼80 are prohibitive for time-of-flight (ToF) based photoelectron spectroscopy. Detectors resolution the 100 ps range yield only 20-100 resolved slices within gap. Here we present two techniques implementing efficient ToF recording at repetition rate. A fast electron-optical beam blanking unit GHz bandwidth, integrated a momentum microscope, allows...
Dalitz plot distribution of the $\eta\to\pi^+\pi^-\pi^0$ decay is determined using a data sample $1.2\cdot 10^7$ $\eta$ mesons from $pd\to ^3\textrm{He}\eta$ reaction at 1 GeV collected by WASA detector COSY.
The paper describes the commissioning of experimental equipment and machine studies required for first spin-filtering experiment with protons at a beam kinetic energy 49.3 MeV in COSY. implementation low-$\ensuremath{\beta}$ insertion made it possible to achieve lifetimes ${\ensuremath{\tau}}_{b}=8000\text{ }\text{ }\mathrm{s}$ presence dense polarized hydrogen storage-cell target areal density...
Abstract X-ray circular dichroism (XMCD), one of the main tools to study magnetism, benefits enormously from capability a fast alterable helicity circularly polarized photons. Here we present method for boosting alternating frequency between right- and left-handed photons MHz regime, more than three orders magnitude faster state-of-the-art technologies. The is based on twin elliptical undulator installed in an electron storage ring being operated novel mode where optics tuned close resonance...
The reaction pp->pppi0pi0 has been investigated at a beam energy of 1.4 GeV using the WASA-at-COSY facility. total cross section is found to be (324 +- 21_systematic 58_normalization) mub. In order study production mechanism, differential kinematical distributions have evaluated. indicate that both initial state protons are excited into intermediate Delta(1232) resonances, each decaying proton and single pion, thereby producing pion pair in final state. No significant contribution Roper...
The unpolarised differential cross section and the two deuteron tensor analysing powers A xx yy of $$\vec dp \to \{ pp\} _s n$$ charge-exchange reaction have been measured with ANKE spectrometer at COSY storage ring. Using beams energies 1.2, 1.6, 1.8, 2.27GeV, data were obtained for small momentum transfers to a {pp} s system low excitation energy. results three lower are consistent impulse approximation predictions based upon current knowledge neutron-proton amplitudes. However, where...
In order to establish links between p-wave pion production in nucleon-nucleon collisions and low energy three-nucleon scattering, an extensive programme of experiments on is currently underway at COSY-ANKE. The final proton pair detected very excitation energy, leading S-wave diproton, denoted here as {pp}_s. We now report measurements the differential cross section analysing power pol{p}p->{pp}_s pi^0$ reaction 353 MeV. Both observables can be described terms s- d-wave and, by using phase...
A value for the mass of eta meson has been determined at COSY-ANKE facility through measurement a set deuteron laboratory beam momenta and associated 3He center-of-mass in d+p -> 3He+X reaction. The was then identified by missing-mass peak production threshold determined. individual were fixed with relative precision 3 x 10^-5 values around GeV/c using polarized inducing an artificial depolarizing spin resonance, which occurs well-defined frequency. final-state two-body 3He+eta reaction...