Abstract:
Projectile fragmentation is one of the two general methods used for the production and study of nuclei far from stability. It has a few important advantages over the alternative ISOL method, like the possibility to identify in-flight individual ions and the speed of delivering them to detection setups. These features allow us to investigate very rare decay modes and very short lifetimes. At the heart of the FAIR facility, there will be a state-of-the-art fragment separator: the Super-FRS. Installed at the SIS-100 synchrotron, it will offer much better research conditions than the existing FRS separator at the SIS-18. After a short presentation of the fragmentation technique and an overview of the existing and planned separators, I will describe two general types of experiments of interest to our group at the University of Warsaw. The first aims at the study of decays of ions at rest, like measurements of two-proton radioactivity. The second is directed to the in-flight decays of very short-lived nuclei, produced in reactions of a radioactive beam in a secondary target. I will give a few examples of such studies performed at the existing GSI facility which can be continued in the future, profiting from the advantages of the Super-FRS.
Abstract:
The current stage of the FAIR project is showing readiness for the first machine component installation in the tunnel. The trial installation should start on spring 2024 and the IFJ PAN team together with FAIR teams will perform it for selected components. During the last two years a significant preparation work has been done by the IFJ PAN team within collaboration agreement, namely String SIS100 trail installation as well as short Multiplets preassembly work. All of this work allowed to verify the installation process and to create the first procedures required for trial installation with respect to the quality of planned work as well as safety aspect. In addition this work for machine with cutting-edge and innovative technology require high qualified personnel with relevant experience which was provided by IFJ PAN. This presentation will show the IFJ PAN team competences and the quality understanding in this kind of the work as well as details of potential additional in-kind contribution to FAIR from Poland.
Abstract:
The accelerator infrastructure available at the FAIR facility offers new possibilities to study atomic structure and fundamental processes with unprecedented precision. In particular, the radiative recombination (RR) of bare and few-electron heavy ions with cooling electrons gives access to measure precisely the energies of emitted X-rays, down to ppm range. A research program and design of a high-resolution diffraction spectrometer for low-energy X-ray spectroscopy in the electron cooler of the CRYRING@ESR storage ring being built within the SPARC collaboration will be described and discussed here. Due to a linear shape of the X-ray source, resulting from the radiative recombination in overlapping ion with electron beams in the electron cooler, the spectrometer will work in an asymmetric von Hamos (AvH) geometry. Moreover, in order to eliminate the Doppler effect, two AvH spectrometers will be installed next to the dipole magnets on both sides of the electron cooler to detect blue/red (00/1800) shifted RR X-rays. The performed X-ray-tracing Monte-Carlo simulations show that the AvH spectrometer will allow to measure, with a high energy resolution down to 100 meV, the low-energy X-rays
(5-10 keV) from radiative recombination of stored bare or few-electron heavy ions interacting with cooling electrons. It means that the energies of the X-ray transitions, as extracted from the recorded line profiles, can be measured with very high relative precision down to 10-6, which gives new access to precision study of the quantum electrodynamics (QED) effects for mid-Z H- and He-like ions, including two-loop effects.
A high-resolution asymmetric von Hamos spectrometer for low-energy X-ray spectroscopy at the CRYRING@ESR electron cooler - prof. Marek Pajek (pdf)