A5050682669- Nuclear physics research studies
- Quantum, superfluid, helium dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Chromodynamics and Particle Interactions
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Quantum chaos and dynamical systems
- Astro and Planetary Science
- Advanced Thermodynamics and Statistical Mechanics
- Advanced NMR Techniques and Applications
- High-pressure geophysics and materials
- Pulsars and Gravitational Waves Research
- Statistical Mechanics and Entropy
- Scientific Research and Discoveries
- Particle physics theoretical and experimental studies
- Gamma-ray bursts and supernovae
- Astronomical and nuclear sciences
- Stellar, planetary, and galactic studies
- Superconducting Materials and Applications
- Material Dynamics and Properties
- Nuclear reactor physics and engineering
- Nuclear Materials and Properties
GSI Helmholtz Centre for Heavy Ion Research
2009-2020
Frankfurt Institute for Advanced Studies
2014-2017
Goethe University Frankfurt
2011-2017
Czech Technical University in Prague
2015
Research Association for Combustion Engines
1999-2011
Yukawa Institute for Theoretical Physics
2010-2011
Darmstadt University of Applied Sciences
1978-2008
Max Planck Institute for Nuclear Physics
1983-2008
Technical University of Darmstadt
1996-2006
University of Washington
1997
The first excited ${0}^{+}$ state in $^{12}\mathrm{C}$ (Hoyle state) has been predicted to be a dilute self-bound gas of bosonic $\ensuremath{\alpha}$ particles, similar Bose-Einstein condensate. To clarify this conjecture, precise electron scattering data on form factors the ground and transition Hoyle are compared with results fermionic molecular dynamics model, microscopic $\ensuremath{\alpha}$-cluster an model reduced degrees freedom (in spirit condensed state). indicate clearly density...
As the study of Brownian movement is key to understanding all dissipative phenomena, author uses it introduce concepts which are then made use in a specific model. The discusses 'one-body dissipation model' its richness phenomena and compares predictions measured data. Special attention paid non-equilibrium relation between friction (or mobility) diffusion.
The time-dependent variational principle for many-body trial states is used to discuss the relation between approaches of different molecular-dynamics models that describe indistinguishable fermions. Early attempts include effects Pauli by means nonlocal potentials, as well more recent work with antisymmetrized states, are reviewed under these premises.
The time-dependent Hartree-Fock approximation is applied to $^{16}\mathrm{O}$ + and $^{40}\mathrm{Ca}$ reactions. An effective interaction which results in a local potential used. full problem reduced two dimensions by treating the relative orbital motion of ions rotating frame approximation. detailed dynamics nuclear density matrix during these reactions discussed. deflection function, energy loss, fragment charge distribution, ion-ion have been computed for several compared with available...
High-precision mass and charge radius measurements on $^{17--22}\mathrm{Ne}$, including the proton-halo candidate $^{17}\mathrm{Ne}$, have been performed with Penning trap spectrometry collinear laser spectroscopy. The $^{17}\mathrm{Ne}$ uncertainty is improved by factor 50, radii of $^{17--19}\mathrm{Ne}$ are determined for first time. fermionic molecular dynamics model explains pronounced changes in ground-state structure. It attributes large to an extended proton configuration ${s}^{2}$...
We employ the unitary correlation operator method (UCOM) to construct correlated, low-momentum matrix elements of realistic nucleon-nucleon interactions. The dominant short-range central and tensor correlations induced by interaction are included explicitly an transformation. Using correlated momentum-space Argonne V18 potential, we show that transformation eliminates strong off-diagonal contributions caused repulsion leaves a dominated contributions. use harmonic oscillator as input for...
We employ correlated realistic nucleon-nucleon interactions for the description of nuclear ground states throughout chart within Hartree-Fock approximation. The crucial short-range central and tensor correlations, which are induced by interaction cannot be described many-body state itself, included explicitly a state-independent unitary transformation in framework correlation operator method (UCOM). Using ${V}_{\mathrm{UCOM}}$ resulting from Argonne V18 potential, bound nuclei already...
The pair decay width of the first excited 0+ state in 12C (the Hoyle state) is deduced from a novel analysis world data on inelastic electron scattering covering wide momentum transfer range, thereby resolving previous discrepancies. extracted value Γπ=(62.3±2.0) μeV independently confirmed by new at low transfers measured S-DALINAC and reduces uncertainty literature values more than factor 3. A precise knowledge Γπ mandatory for quantitative studies some key issues modeling supernovae...
Short-range correlations between nucleon pairs in different spin-isospin channels are investigated for light nuclei using the Argonne V8' interaction. At distances below 1 fm a universal behavior is found deuteron, 3H, 3He and ground first excited states 4He. This coordinate space reflected by high-momentum components momentum space. The universality indicates that pairwise renormalization possible order to obtain effective two-body interaction does not scatter high states. exact densities...
The influence of boson-boson and boson-fermion interactions on the stability a binary mixture bosonic fermionic atoms is investigated. density profiles trapped are obtained from direct numerical solution modified Gross-Pitaevskii equation that self-consistently coupled to mean field generated by interaction with species, fermions which in turn feel created bosons treated Thomas-Fermi approximation. We study effects different combinations signs scattering lengths determine explicit...
The electromagnetic transition between the almost degenerate $5/{2}^{+}$ and $3/{2}^{+}$ states in $^{229}\mathrm{Th}$ is deemed to be very sensitive potential changes fine structure constant $\ensuremath{\alpha}$. State of art Hartree-Fock Hartree-Fock-Bogoliubov calculations are performed compute difference Coulomb energies two that determines sensitivity frequency \ensuremath{\nu} on variations kinetic also calculated reflect a possible variation nucleon or quark masses. As differ mainly...
$\mathbf{Background:}$ Realistic nucleon-nucleon interactions induce short-range correlations in nuclei. To solve the many-body problem unitary transformations like similarity renormalization group (SRG) are often used to soften interactions. $\mathbf{Purpose:}$ Two-body densities can be illustrate how SRG eliminates wave function. The information however recovered by transforming density operators. $\mathbf{Method:}$ is solved for $^4$He no core shell model (NCSM) with transformed AV8' and...
The structure and stability of dilute degenerate Fermi gases trapped in an external potential is discussed with special emphasis on the influence s- p-wave interactions. In a first step effective contact interaction for all partial waves derived, which reproduces energy spectrum full within mean-field model space. Using part density multicomponent gas calculated Thomas-Fermi approximation. On this basis one- two-component against induced collapse investigated. Explicit conditions terms total...