A5089444000- Quantum Chromodynamics and Particle Interactions
- Nuclear physics research studies
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Advanced NMR Techniques and Applications
- Rare-earth and actinide compounds
- Quantum, superfluid, helium dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Particle accelerators and beam dynamics
- Quantum chaos and dynamical systems
- Atomic and Subatomic Physics Research
- Pulsars and Gravitational Waves Research
- High-pressure geophysics and materials
- Neutrino Physics Research
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Physics of Superconductivity and Magnetism
- Astronomical and nuclear sciences
- Crystallography and Radiation Phenomena
- Inorganic Fluorides and Related Compounds
- Nuclear reactor physics and engineering
- Superconductivity in MgB2 and Alloys
- Black Holes and Theoretical Physics
Forschungszentrum Jülich
2007-2016
St Petersburg University
2009-2016
University of Bonn
2007-2014
Moscow Institute of Physics and Technology
2012
George Washington University
2010-2011
University of Georgia
2010-2011
Institute for Physics and Power Engineering
2009
Institute of Physics
2009
Max Planck Institute for Nuclear Physics
1974-2006
The University of Adelaide
2003
We investigate the structure of nucleon resonance N^*(1440) (Roper) within a coupled-channel meson exchange model for pion-nucleon scattering. The coupling to pipiN states is realized effectively by sigmaN, piDelta and rhoN channels. interaction between these channels derived from an effective Lagrangian based on chirally symmetric Lagrangian, which supplemented well known terms Delta isobar, omega 'sigma', name given here strong correlation two pions in scalar-isoscalar channel. In this...
We investigate the nature of near-threshold enhancement in $p\overline{p}$ invariant-mass spectrum reaction $J/\ensuremath{\Psi}\ensuremath{\rightarrow}\ensuremath{\gamma}p\overline{p}$ reported recently by BES Collaboration. Using J\"ulich $N\overline{N}$ model we show that mass dependence close to threshold can be reproduced $S$-wave final state interaction isospin $I=1$ within Watson-Migdal approach. However, because our poor knowledge and mechanism view controversal situation decay...
A new method to determine the spin tune is described and tested. In an ideal planar magnetic ring, tune-defined as number of precessions per turn-is given by ν(s)=γG (γ Lorentz factor, G gyromagnetic anomaly). At 970 MeV/c, deuteron spins coherently precess at a frequency ≈120 kHz in Cooler Synchrotron COSY. The deduced from up-down asymmetry deuteron-carbon scattering. time interval 2.6 s, was determined with precision order 10^{-8}, 1×10^{-10} for continuous 100 s accelerator cycle. This...
We observe a deuteron beam polarization lifetime near 1000 s in the horizontal plane of magnetic storage ring (COSY). This long spin coherence time is maintained through combination bunching, electron cooling, sextupole field corrections, and suppression collective effects current limits. record required for search an intrinsic electric dipole moment on at statistical sensitivity level approaching 10^{-29} e cm.
The positions and widths of E0, E1, E2, E3, E4 giant resonances are calculated with a density-dependent force.Received 14 October 1974DOI:https://doi.org/10.1103/PhysRevLett.33.1386©1974 American Physical Society
Consideration of both the effect one-pion and $\ensuremath{\rho}$-meson exchange potentials in particle-hole interaction inclusion 2p-2h configurations explains why magnetic high-spin states discovered recently $^{208}\mathrm{Pb}$ are close to shell-model energies although cross sections only 50% single-particle estimate.
The charged and neutral pion photoproduction reactions are investigated in a dynamical coupled-channels approach based on the formulation of Haberzettl, Huang, Nakayama [Phys. Rev. C 83, 065502 (2011)]. hadronic final-state interaction is provided by J\"ulich $\ensuremath{\pi}N$ model, which includes channels $\ensuremath{\eta}N$ comprising stable hadrons as well effective $\ensuremath{\pi}\ensuremath{\pi}N$ $\ensuremath{\pi}\ensuremath{\Delta}$, $\ensuremath{\sigma}N$, $\ensuremath{\rho}N$....
The $E1$ strength function for 15 stable and unstable Sn even-even isotopes from $A=100$ to $A=176$ are calculated using a self-consistent microscopic theory which, in addition the standard (quasiparticle) random-phase approximation [(Q)RPA] approach, takes into account phonon coupling single-particle continuum (by means of discretization procedure) with cutoff 100 MeV. Our analysis shows two distinct regions which integral characteristics both giant pygmy resonances behave rather...
Excitation energies and transition probabilities of the first ${2}^{+}$ excitations in even tin lead isotopes as well quadrupole moments odd neighbors these are calculated within self-consistent theory finite Fermi systems based on energy density functional by Fayans et al. [Nucl. Phys. A 676, 49 (2000)]. The effect dependence effective pairing interaction is analyzed detail comparing results obtained with volume surface pairing. found to be noticeable. For example, systematically higher at...
We present results of the time blocking approximation (TBA) on giant resonances in light, medium and heavy mass nuclei. The TBA is an extension widely used random-phase (RPA) adding complex configurations by coupling to phonon excitations. A new method for handling single-particle continuum developed applied calculations. investigate detail dependence numerical size single particle space number phonons as well nuclear matter properties. Our approach self-consistent, based energy-density...
A fully gauge-invariant (pseudoscalar) meson photoproduction amplitude off a nucleon including the final-state interaction is derived. The approach based on comprehensive field-theoretical formalism developed earlier by one of authors replaces certain dynamical features full current phenomenological auxiliary contact currents. procedure outlined that allows for systematic improvement this approximation. feasibility illustrated applying it to both neutral and charged pion photoproductions.
Motivated by recent experiments we have studied ${\ensuremath{\nu}}_{\mathit{e}}$ and ${\ensuremath{\nu}}_{\mathrm{\ensuremath{\mu}}}$ induced charged- neutral-current reactions on $^{12}\mathrm{C}$ within the continuum random phase approximation employing two different residual interactions. We find good agreement with measured cross sections for reactions, while our calculation signficantly differs from recently sections. Our indicates that measurements of total...