Abstract
The FRS Ion Catcher at GSI enables precision experiments with projectile and fission fragments The fragments are produced at relativistic energies in the target, spatially separated and energy bunched in the fragment separator (FRS), and slowed-down and thermalized in a cryogenic stopping cell (CSC) A versatile RFQ beamline and diagnostics unit and a high-performance multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) enable a variety of experiments, including high precision mass measurements, isomer measurements and mass selected decay spectroscopy Access to millisecond nuclides has been demonstrated by the first direct mass measurement and mass-selected half-life measurement of 215Po (half-life: 178 ms) The relative population of isomer and ground states and excitation energies of short-lived exotic nuclei have been determined at the FRS Ion Catcher The combination of a high density CSC with fast ion extraction (25 ms) and the MR-TOF-MS is an ideal tool to access isomers with half-lives as short as a few ms This method is thus fully complementary to gamma-ray spectroscopy For the first time, an isomerically clean beam has been separated with an MR-TOF-MS, as demonstrated with 211Po ions Results of isomeric-to-ground state ratios and excitation energies of uranium and xenon projectile fragments and uranium fission products measured with the MR-TOF-MS will be presented In total about 15 isomers were measured with a mass resolving power up to 450,000 Systematic investigation of the relative population of isomer and ground states and excitation energies were done with proton-rich indium isotopes This document is composed of an abstract and the slides of the presentation (author)
Original language | American English |
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State | Published - 2017 |