H. Kleines
A5063455732- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- High-Energy Particle Collisions Research
- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Quantum, superfluid, helium dynamics
- Particle Accelerators and Free-Electron Lasers
- Embedded Systems Design Techniques
- Superconducting Materials and Applications
- Dark Matter and Cosmic Phenomena
- Nuclear reactor physics and engineering
- Parallel Computing and Optimization Techniques
- Advanced NMR Techniques and Applications
- Real-Time Systems Scheduling
- Network Time Synchronization Technologies
- Atomic and Molecular Physics
- Flexible and Reconfigurable Manufacturing Systems
- CCD and CMOS Imaging Sensors
- High-pressure geophysics and materials
- Medical Imaging Techniques and Applications
Forschungszentrum Jülich
2012-2023
Uppsala University
2017-2020
Justus-Liebig-Universität Gießen
2016-2020
Friedrich-Alexander-Universität Erlangen-Nürnberg
2014
Institute of Modern Physics
2009
Campbell Collaboration
2009
IPS Elektroniklabor (Germany)
2003-2007
Stadtwerke Jülich (Germany)
2005
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 KWS-1 small-angle neutron scattering (SANS) instrument operated by the Jülich Centre for Neutron Science (JCNS) at research reactor FRM II of Heinz Maier-Leibnitz Zentrum in Garching near Munich has been recently upgraded. was updated, from its active collimation apertures to detector cabling. Most parts were installed first time, including a broadband polarizer, large-cross-section radio-frequency spin flipper, chopper and lenses. A custom-designed hexapod sample position allows heavy...
SPHERES is a third-generation neutron backscattering spectrometer, located at the 20 MW German source FRM II and operated by Jülich Centre for Neutron Science. It offers an energy resolution (fwhm) better than 0.65 μeV, dynamic range of ± 31 signal-to-noise ratio up to 1750:1.
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...
MARIA (magnetism reflectometer with high incident angle) is a world class vertical sample dedicated to the investigation of thin films in fields magnetism, soft matter and biology. The elliptical vertically focusing guide allows one measure small samples typical size 1 × cm very efficiently. double-bounce polarizer situ pumped 3He SEOP (spin-exchange optical pumping) neutron spin filter cell for analysing polarization reflected beam can be moved into seconds. polarized flux amounts 5 107 n...
We report on a high-statistics measurement of the most basic double pionic fusion reaction $\vec{n}p \to d\pi^0\pi^0$ over energy region $d^*(2380)$ resonance by use polarized deuteron beam and observing in quasifree scattering mode. The measurements were performed with WASA detector setup at COSY. data reveal substantial analyzing powers confirm conclusions about $d^*$ obtained from unpolarized measurements. also previous under complementary kinematic conditions.
Neutron spin echo (NSE) spectroscopy is, due to its high energy resolution, a well-suited method for studying slow dynamics, such as the dynamics of soft matter systems (glasses, polymers and complex liquids), or paramagnetic properties of, e.g., glasses. The Jülich NSE spectrometer has been in operation at research reactor FRJ-2 since 1996. It transferred now new FRM II TU München, where it just started continue operation. In context transfer, parts have renewed improved, leading...
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 measurements of the quasi-free pn→ppπ− and pp→ppπ0 reactions have been performed by means pd collisions at Tp=1.2 GeV using WASA detector setup COSY. Total differential cross sections obtained covering energy region Tp=0.95–1.3GeV (s=2.3–2.46 GeV), which includes regions Δ(1232), ⁎N⁎(1440) ⁎d⁎(2380) resonance excitations. From these isoscalar single-pion production has extracted, for data existed so far only below Tp=1 GeV. We observe a substantial increase this section around 1...
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...
High Current Compact Accelerator-driven Neutron Sources (HiCANS) have recently emerged as a possible solution to the drop in neutron provision Europe due closure of several research reactors. Within this new trend, Laboratoire Léon Brillouin (LLB) is currently assessing performance techniques around novel type source. HERMES time-of-flight horizontal reflectometer that was operated by LLB at ORPHEE reactor until 2019 and dedicated soft matter studies. Through collaboration with Jülich Centre...
Recently, the complex PROFINET CBA (component based automation) has been supplemented by simplified IO standard. defines a vendor-independent engineering model covering plant-wide automation and uses component/container approach. Contrary to this, aims at decentral periphery scenarios. Analogous PROFIBUS DP it is on modular device model. Functionally, can be considered as an Ethernet-based fieldbus. It expected that will play major role PLC market since possible replacement for DP. The paper...
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 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...