G. Sterzenbach
A5058701523- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Quantum, superfluid, helium dynamics
- Nuclear Materials and Properties
- Radiation Therapy and Dosimetry
- X-ray Spectroscopy and Fluorescence Analysis
- Particle Accelerators and Free-Electron Lasers
- Graphite, nuclear technology, radiation studies
- Cold Atom Physics and Bose-Einstein Condensates
- Electromagnetic Compatibility and Measurements
- Global Energy Security and Policy
- Advanced Frequency and Time Standards
- Molten salt chemistry and electrochemical processes
- Scientific Computing and Data Management
- Fusion materials and technologies
- Distributed and Parallel Computing Systems
- Pulsars and Gravitational Waves Research
- Microwave Imaging and Scattering Analysis
Forschungszentrum Jülich
2011-2020
Uppsala University
2017-2020
Johannes Gutenberg University Mainz
2014-2020
Campbell Collaboration
2014-2020
Lawrence Berkeley National Laboratory
2020
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2020
Florida State University
2020
High Energy Accelerator Research Organization
2018
National Centre for Nuclear Research
2018
Friedrich-Alexander-Universität Erlangen-Nürnberg
2018
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...
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.
Excitation functions of proton-proton elastic scattering cross sections have been measured in narrow steps for projectile momenta ${p}_{p}$ (energies ${T}_{p}$) from $1100$ to $3300\mathrm{MeV}/c$ (500 2500 MeV) the angular range $35\ifmmode^\circ\else\textdegree\fi{}\ensuremath{\le}{\ensuremath{\Theta}}_{\mathrm{c}.\mathrm{m}.}\ensuremath{\le}90\ifmmode^\circ\else\textdegree\fi{}$ with a detector providing...
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...
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...
The WASA-at-COSY experiment has collected $3\ifmmode\times\else\texttimes\fi{}{10}^{7}$ events with $\ensuremath{\eta}$ mesons produced via the reaction $pd\ensuremath{\rightarrow}^{3}\mathrm{He}\phantom{\rule{0.16em}{0ex}}\ensuremath{\eta}$ at $\mathrm{T}=1.0\phantom{\rule{4pt}{0ex}}\mathrm{GeV}$. Using this data set, we evaluate branching ratios of decays $\ensuremath{\eta}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\gamma}$,...
Using the production reactions $pd\to {}^3\mbox{He}\,\omega$ and $pp\to pp\omega$, Dalitz plot distribution for $\omega \to \pi^+ \pi^- \pi^0$ decay is studied with WASA detector at COSY, based on a combined data sample of $ (4.408\pm 0.042) \times 10^4$ events. The density parametrised by product $P$-wave phase space polynomial expansion in normalised polar variables $Z$ $\phi$. For first time, deviation from pure observed significance $4.1\sigma$. linear term $1+2\alpha Z$, $\alpha$...
Exclusive measurements of the quasifree pp→ppπ+π− reaction have been carried out at WASA@COSY by means pd collisions Tp=1.2 GeV. Total and differential cross sections extracted covering energy region Tp=1.08–1.36 GeV, which is N∗(1440) Δ(1232)Δ(1232) resonance excitations. Calculations describing these excitations t-channel meson exchange are variance with measured underpredict substantially experimental total section. An isotensor ΔN dibaryon I(JP)=2(1+) produced associatedly a pion able to...
Various theoretical calculations based on QCD or hadronic interactions predict that in addition to the recently observed dibaryon resonance ⁎d⁎(2380) with I(JP)=0(3+) there should also exist a mirrored quantum numbers I(JP)=3(0+). We report here search for such NN-decoupled state data pp→ppπ+π+π−π− reaction. Since no clear-cut evidence has been found, we give upper limits production cross section of mass range 2280–2500 MeV.