Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Instrumentierung

HK 45.1: Gruppenbericht

Donnerstag, 20. März 2014, 14:00–14:30, HZ 10

Status and Perspective of the FRS Ion Catcher Experiment — •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 in common that they are on the chart of nuclides far away from the valley of stability, which corresponds to an unusual ratio of neutrons to protons and short half-lives. Possible ways of producing exotic nuclei in the laboratory are for example projectile fragmentation and fission. Nuclei produced this way have high energies and must be slowed down for high-accuracy low-energy experiments like MATS and LaSpec. At the FRS Ion Catcher experiment this has been done in July and August 2012 for an Uranium beam with 1GeV/u fragmented on a Beryllium target. The projectile fragments have been separated in-flight, range-bunched, slowed-down in the Fragment Separator (FRS) at GSI and subsequently thermalized in a cryogenic stopping cell (CSC). With the ions extracted from the CSC and transported to a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS), mass measurements were performed for isotopes with A=211 and A=213. Essential for the measurements were a fast and efficient extraction from the CSC and a quick mass measurement, because of the low detection rate and short half-lives for the nuclides of interest. In this presentation the results of our experiment in July and August 2012 and goals for the next beam time in 2014 will be presented.