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SFB 634:  Nuclear Structure, Nuclear Astrophysics and Fundamental Experiments at Low Momentum Transfer at the Superconducting Darmstadt Electron Accelerator S-DALINAC

Subject Area Physics
Term from 2003 to 2015
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 5485852
 
The Collaborative Research Centre aims at an understanding of the structure of nuclei and its impact on astrophysical processes. The experiments focus on the study of nuclear excitations with real and virtual photons using the Superconducting Darmstadt Electron Accelerator S-DALINAC. They provide a detailed understanding of the nuclear charge and current distributions and thus enable to test descriptions of nuclear dynamics in the context of modern many body theory. Furthermore, the experiments provide information on various aspects of stellar evolution and nucleosynthesis otherwise hardly accessible. For example, cross sections for the gamma-process responsible for the production of proton-rich, heavy nuclei as well as for neutrino-induced nucleosynthesis can be measured. Finally, the late stages of a massive star and its route to a supernova explosion are governed by the excitation of elementary nuclear modes whose properties are elucidated in electron scattering.
The experimental programme is strongly linked to theoretical work based on fundamental developments in the many-body theory. Their goal is to describe as realistic as possible the ground state properties and the excitation spectrum and to provide quantitative predictions for nuclei under extreme conditions as well as for homogeneous nuclear and neutron matter. Also, experimental and theoretical investigations in the field of quantum chaos are carried out using two- and three-dimensional microwave billiards which show the same generic spectral behaviour as found e.g. in nuclei.
The recent development of an effective field theory based on a chiral symmetry of the underlying strong force calls for precision data on properties of the nucleon and few-body systems at low energies and momentum transfers, well in the range of the S-DALINAC parameters. Thus, a series of experiments is planned on the radius of the proton, the electric and magnetic polarisabilities of the proton and neutron, and on nucleon correlations in few-body systems like 2D and 3He.
Finally, the further development of the accelerator, its beam transport system and diagnosis is a central issue. Several goals are envisaged: to integrate an online simulation of the beam dynamics, to replace the current monitoring and control system by a system based on integrated circuits, and an energy and intensity increase of the machine. Also, a source of polarised electrons is currently under construction.
DFG Programme Collaborative Research Centres

Completed projects

Applicant Institution Technische Universität Darmstadt
 
 

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