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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Structure and Dynamics of Nuclei VI

HK 27.2: Gruppenbericht

Dienstag, 15. März 2016, 17:00–17:30, S1/01 A03

Status and Outlook of the FRS Ion Catcher at GSI — •Jens Ebert — Justus-Liebig-Universität Gießen

Exotic nuclei are produced in stellar processes like the p- and r-process and are essential for our understanding of nucleosynthesis beyond iron. They have an unusual ratio of neutrons to protons and short half-lives in common. Important production methods for exotic nuclei in the laboratory are projectile fragmentation and fission of heavy ions. Nuclei produced this way have energies up to several GeV/u and must be slowed down and separated from other beam products and contaminants for high-accuracy low-energy experiments with traps and lasers. This is tested by the FRS Ion Catcher, which is a test bench for the low energy branch of the Super-FRS at FAIR. There, the nuclei are separated in-flight, range-bunched, slowed-down in the fragment separator and subsequently thermalized in a cryogenic stopping cell. The ions extracted from the stopping cell will be transported to a multiple-reflection time-of-flight mass spectrometer for high accuracy mass measurements, decay spectroscopy or separation and preparation for further experiments.
A novel technical method allows mass measurements of nuclides with half-lifes of about 1ms such as ²¹⁵Po. From our online campaign in 2014 almost background-free α-spectroscopy, mass selected decay spectroscopy and measurements of excitation energies and isomeric ratios will be presented together with instrumental advances.