323 research outputs found
FAIR - from a few-body perspective
In the next years the Facility for Antiproton and Ion Research FAIR will be constructed at the GSI Helmholtzzentrum fur Schwerionenforschung in Darmstadt, Germany. This new accelerator complex will allow for unprecedented and pathbreaking research in hadronic, nuclear, and atomic physics as well as in applied sciences. This manuscript will discuss some of these research opportunities, with a focus on few-body physics
Dynamic process control of continuous twin-column chromatography
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Dynamical coupling of pygmy and giant resonances in relativistic Coulomb excitation
We study the Coulomb excitation of pygmy dipole resonances (PDR) in heavy ion
reactions at 100 MeV/nucleon and above. The reactions 68Ni+197Au and 68Ni+208Pb
are taken as a practical examples. Our goal is to address the question of the
influence of giant resonances on the PDR as the dynamics of the collision
evolves. We show that the coupling to the giant resonances affects considerably
the excitation probabilities of the PDR, a result that indicates the need of an
improved theoretical treatment of the reaction dynamics at these bombarding
energies.Comment: 6 pages, 4 figures, accepted for publication in Physics Letters
Fragmentation of exotic oxygen isotopes
Abrasion-ablation models and the empirical EPAX parametrization of projectile fragmentation are described. Their cross section predictions are compared to recent data of the fragmentation of secondary beams of neutron-rich, unstable 19,20,21O isotopes at beam energies near 600 MeV/nucleon as well as data for stable 17,18O beams
First Measurement of the Ru(p,)Rh Cross Section for the p-Process with a Storage Ring
This work presents a direct measurement of the Ru()Rh cross section via a novel technique using a storage ring,
which opens opportunities for reaction measurements on unstable nuclei. A
proof-of-principle experiment was performed at the storage ring ESR at GSI in
Darmstadt, where circulating Ru ions interacted repeatedly with a
hydrogen target. The Ru()Rh cross section between 9
and 11 MeV has been determined using two independent normalization methods. As
key ingredients in Hauser-Feshbach calculations, the -ray strength
function as well as the level density model can be pinned down with the
measured () cross section. Furthermore, the proton optical potential
can be optimized after the uncertainties from the -ray strength
function and the level density have been removed. As a result, a constrained
Ru()Rh reaction rate over a wide temperature range is
recommended for -process network calculations.Comment: 10 pages, 7 figs, Accepted for publication at PR
HICFD – Highly Efficient Implementation of CFD Codes for HPC Many-Core Architectures
The objective of the German BMBF research project Highly Efficient Implementation
of CFD Codes for HPC Many-Core Architectures (HICFD) is to develop
new methods and tools for the analysis and optimization of the performance
of parallel computational fluid dynamics (CFD) codes on high performance computer
systems with many-core processors. In the work packages of the project it
is investigated how the performance of parallel CFD codes written in C can be increased
by the optimal use of all parallelism levels. On the highest level MPI is
utilized. Furthermore, on the level of the many-core architecture, highly scaling,
hybrid OpenMP/MPI methods are implemented. On the level of the processor cores
the parallel SIMD units provided by modern CPUs are exploited
Measurements of proton-induced reactions on ruthenium-96 in the ESR at GSI
8th International Conference on Nuclear Physics at Storage Rings Stori11, October 9-14, 2011 Laboratori Nazionale di Frascati, Italy.
Storage rings offer the possibility of measuring proton- and alpha-induced reactions in inverse kinematics. The combination of this approachwith a radioactive beamfacility allows, in principle, the determination of the respective cross sections for radioactive isotopes. Such data are highly desired for a better understanding of astrophysical nucleosynthesis processes like the p-process. A pioneering experiment has been performed at the Experimental Storage Ring (ESR) at GSI using a stable 96Ru beam at 9-11 AMeV and a hydrogen target. Monte-Carlo simulations of the experiment were made using the Geant4 code. In these simulations, the experimental setup is described in detail and all reaction channels can be investigated. Based on the Geant4 simulations, a prediction of the shape of different spectral components can be performed. A comparison of simulated predictions with the experimental results shows a good agreement and allows the extraction of the cross section
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