H. Clement
A5046128673- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Advanced NMR Techniques and Applications
- Atomic and Molecular Physics
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Advanced Chemical Physics Studies
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Astronomical and nuclear sciences
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Neutrino Physics Research
- High-pressure geophysics and materials
- X-ray Spectroscopy and Fluorescence Analysis
- Particle Detector Development and Performance
- Cold Fusion and Nuclear Reactions
- Radiation Detection and Scintillator Technologies
- Nuclear reactor physics and engineering
- Electron Spin Resonance Studies
- Scientific Research and Discoveries
- Computational Physics and Python Applications
- International Science and Diplomacy
University of Tübingen
2013-2023
Austrian Academy of Sciences
2018
Stefan Meyer Institute for Subatomic Physics
2018
Friedrich-Alexander-Universität Erlangen-Nürnberg
1969-2016
Institute of Nuclear Physics, Polish Academy of Sciences
2011
Polish Academy of Sciences
2011
Universität Hamburg
2008-2010
Uppsala University
1998-2009
Russian Academy of Sciences
2004
The University of Melbourne
2002
The ABC effect-a puzzling low-mass enhancement in the pipi invariant mass spectrum, first observed by Abashian, Booth, and Crowe-is well known from inclusive measurements of two-pion production nuclear fusion reactions. Here we report on exclusive kinematically complete most basic double-pionic reaction pn-->dpi;{0}pi;{0} at beam energies 1.03 1.35 GeV. measurements, which have been carried out CELSIUS-WASA, reveal effect to be a (pipi)_{I=L=0} channel phenomenon associated with both...
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...
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...
The nuclear density overlap, which occurs during refractive heavy-ion scattering, opens an alternative approach to study the equation of state (EOS) for cold matter. For this purpose elastic $^{16}\mathrm{O}$ + scattering at incident enegies 145, 250, 350, and 480 MeV has been measured very accurately, up large angles. A systematic folding analysis these data performed using effective dependent interaction based on $G$-matrix elements Paris nucleon-nucleon potential. We find, with observed...
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...
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.
The pp-->pp pi(+) pi(-) reaction has been measured exclusively near threshold at CELSIUS. total cross sections are nearly an order of magnitude lower than expected from previous inclusive measurements. differential reveal pp-->pp(*)(1440)-->pp sigma = pp(pi(+)pi(-))(I l 0) as the dominant process well significant contributions p(*)-->Delta(++)pi(-)-->psigma. observed anisotropy in proton angular dependence is consistent with heavy-meson exchange. In invariant mass spectra, no narrow...
This Letter of Intent has been submitted to the Scientific Committee INFN Laboratori Nazionali del Gran Sasso (LNGS) in March 2004. It describes a novel facility at LNGS study double beta decay 76Ge using an (optionally active) cryogenic fluid shield. The setup will allow scrutinize with high significance on short time scale current evidence for neutrinoless existing diodes from previous Heidelberg-Moscow and IGEX experiments. An increase lifetime limit can be achieved by adding more...
The first measurement of the cross section quasifree $p\stackrel{\ensuremath{\rightarrow}}{n}\mathrm{pn}\ensuremath{\eta}$ reaction has been carried out at CELSIUS storage ring using a deuterium internal cluster jet target. energy dependence is extracted fixed incident proton ${T}_{p}=1350 \mathrm{MeV}$ and exploiting Fermi momentum struck neutron. data cover range center-of-mass excess energies from 16 to 109 MeV. shape excitation function broadly similar that...
Inelastic scattering of vector polarized deuterons near ${E}_{d}=20$ MeV has been measured for a series target nuclei ranging from the $\mathrm{sd}$ shell to $^{232}\mathrm{Th}$. Isoscalar transition rates deduced collective-model analysis are found be in agreement with corresponding electromagnetic quantities quadrupole and octupole excitations $T=0$ $^{208}\mathrm{Pb}$. For excitation $^{144}\mathrm{Sm}$, $^{152}\mathrm{Sm}$, $^{154}\mathrm{Sm}$, $^{232}\mathrm{Th}$ about 20% smaller...
A search for rare lepton decays of the $\ensuremath{\eta}$ meson was performed using WASA detector at CELSIUS. Two candidates double Dalitz decay $\ensuremath{\eta}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}{e}^{+}{e}^{\ensuremath{-}}$ events are reported with a background $1.3\ifmmode\pm\else\textpm\fi{}0.2$ events. This allows to set an upper limit branching ratio $9.7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ (90% CL). The...
This paper reports results on simultaneous measurements of the reaction channels pp $ \rightarrow$ pK + \Lambda$ and \Sigma^{0}_{}$ at excess energies 204, 239, 284MeV ( 127, 162, 207MeV . Total differential cross-sections are given for both reactions. It is concluded from measured total that high-energy limit cross-section ratio almost reached an energy only about 200MeV. From distributions observed in overall CMS as well Jackson helicity frames, a significant contribution interfering...