Abstract
The FRS Ion Catcher at GSI enables precision experiments with thermalized projectile and fission fragments. At the same time it serves as a test facility for the Low-Energy Branch of the Super-FRS at FAIR. The FRS Ion Catcher has been commissioned and its performance has been characterized in five experiments with 238U and 124Xe projectile and fission fragments produced at energies in the range from 300 to 1000 MeV/u. High and almost element-independent efficiencies for the thermalization of short-lived nuclides produced at relativistic energies have been obtained. High-accuracy mass measurements of more than 30 projectile and fission fragments have been performed with a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) at mass resolving powers of up to 410,000, with production cross sections down to the microbarn-level, and at rates down to a few ions per hour. The versatility of the MR-TOF-MS for isomer research has been demonstrated by the measurement of various isomers, determination of excitation energies and the production of a pure isomeric beam. Recently, several instrumental upgrades have been implemented at the FRS Ion Catcher. New experiments will be carried out during FAIR Phase-0 at GSI, including direct mass measurements of neutron-deficient nuclides below 100Sn and neutron-rich nuclides below 208Pb, measurement of β-delayed neutron emission probabilities and reaction studies with multi-nucleon transfer.
Highlights
At the FRS Ion Catcher (FRS-IC) [1] precision experiments with thermalized exotic nuclei can be performed
A versatile RF quadrupole (RFQ) beam line guides the ions from the cryogenic stopping cell (CSC) to the MR-TOF-MS, provides differential pumping, ion identification and mass separation and includes reference ion sources
The FRS-IC serves as a test facility for the Low-Energy Branch (LEB) of the Super-FRS and already enables a variety of new precision experiments in FAIR Phase-0
Summary
At the FRS Ion Catcher (FRS-IC) [1] precision experiments with thermalized exotic nuclei can be performed. With the FRS-IC (Fig. 1) these fragments are slowed down and thermalized in a cryogenic stopping cell (CSC) [3]. A multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) is used to perform direct mass measurements and to provide an isobarically and isomerically clean beam for further experiments, such as mass-selected decay spectroscopy [4, 5]. A versatile RF quadrupole (RFQ) beam line guides the ions from the CSC to the MR-TOF-MS, provides differential pumping, ion identification and mass separation and includes reference ion sources. The FRS-IC serves as a test facility for the Low-Energy Branch (LEB) of the Super-FRS and already enables a variety of new precision experiments in FAIR Phase-0
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
