Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Structure and Dynamics of Nuclei IV

HK 18.1: Gruppenbericht

Dienstag, 31. März 2020, 17:00–17:30, J-HS H

Recent results from the FRS Ion Catcher — •Gabriella Kripkó-Koncz for the FRS Ion Catcher collaboration — II. Physikalisches Institut, Justus-Liebig-Universität Gießen, Gießen, Germany

The atomic masses of exotic nuclei provide key information for the understanding of nuclear structure and astrophysics. Combining a cryogenic stopping cell (CSC) and a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS), the FRS Ion Catcher experiment (FRS-IC) at the Fragment Separator (FRS), GSI enables high precision mass measurements or isobar and isomer separation with thermalized projectile and fission fragments. Incorporating several novel and unique concepts, the system enables the highest performance, such as a mass resolving power up to 1,000,000 and mass accuracies down to 6·10−8.

The first direct mass measurements of seven isotopes close to the double magic nucleus 208Pb allowed to study the evolution of the two-neutron separation energies. Mass measurements of projectile fragments in the vicinity of 100Sn were performed, including the first mass measurement of the 101In ground state. Two new isomeric states were discovered in 97Ag and 101In. A novel technique for measuring half-lives and decay branching ratios was developed and demonstrated experimentally. These results, recent technical upgrades, and approved experiments for FAIR Phase-0 will be presented.

The FRS-IC also serves as a prototype for the future Ion Catcher at the Low-Energy-Branch (LEB) of the Super-FRS at FAIR. Latest results of the next-generation CSC for the LEB will be discussed.

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