Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Structure and Dynamics of Nuclei 10

HK 46.5: Vortrag

Mittwoch, 25. März 2015, 15:30–15:45, T/SR14

Isomer measurements with the MR-TOF-MS at the FRS Ion Catcher — •Christine Hornung for the FRS Ion Catcher collaboration — II. Physikalisches Institut, Justus-Liebig-Universität Giessen, Giessen, Germany

At the future Low-Energy Branch (LEB) of the Super-FRS at FAIR, the precision experiments MATS and LaSpec will be performed. The FRS Ion Catcher at GSI is the test facility for the future LEB, consisting of the following three key components. With the FRS projectile and fission fragments are produced at relativistic energies, separated in-flight and range-focused. Further they are slowed-down and thermalized in a cryogenic stopping cell (CSC) to kinetic energies of a few eV. A multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) is used to clean the beam from isobaric contaminants. Due to its ultra-high mass resolving power excited and ground state can be spatially separated and pure isomeric beams can be provided.

In the experiment in October 2014, mass measurements of the isomeric and ground states of projectile and fission fragments were performed with the MR-TOF-MS. The capability of the MR-TOF-MS of a simultaneous mass measurement of the ground and isomeric state is used to confirm excitation energies and yield ratios of isomers and it will open new possibilities for mass and isomer resolved decay spectroscopy. This will lead to a better understanding of the production mechanisms and yield rates of in-flight facilities.