Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Structure and Dynamics of Nuclei VI

HK 41.3: Talk

Thursday, March 30, 2017, 14:45–15:00, F 2

Measurements of isomers at the FRS Ion Catcher — •Christine Hornung for the FRS Ion Catcher collaboration — Justus-Liebig Universität Gießen, Germany

Projectile fragmentation and fission reactions at in-flight facilities are important production mechanisms to access short-lived exotic nuclei. It is a challenge to describe the angular momentum distribution after the collision of relativistic nuclei. This can be experimentally accessed by measuring the population of isomeric states.

The relative population of the isomer and ground states and excitation energies of short-lived exotic nuclei can be determined via high resolution mass spectrometry at the FRS Ion Catcher at GSI. Here, projectile and fission fragments are produced at relativistic energies and separated in-flight. Ions are transported to a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS), where masses of the ground and isomeric states can be measured in a broad mass range simultaneously. This method gives access to long-lived isomers (≥1 ms) directly ideally complementing gamma-ray spectroscopy. The MR-TOF-MS can also be used to spatially separate the ions in order to provide isomerically clean ion beams.

Results of isomeric ratios and excitation energies of uranium projectile and fission fragments measured with the MR-TOF-MS with a mass resolving power in excess of 400,000 will be presented. Furthermore ratios and excitation energies of isomers of xenon fragments were measured during a recent experiment.