Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 57: Nuclear Astrophysics V

HK 57.6: Talk

Thursday, March 17, 2016, 18:00–18:15, S1/01 A04

High Precision Mass Measurements of Thermalized Relativistic Uranium Projectile and Fission Fragments with a Multiple-Reflection Time-of-Flight Mass Spectrometer — •Samuel Ayet San Andrés for the FRS Ion Catcher collaboration — GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — Justus Liebig Universität, Gießen, Germany

At the FRS Ion Catcher at GSI, a relativistic beam of ²³⁸U at 1GeV/u was used to produce fission and projectile fragments on a beryllium target. The ions were separated in-flight at the FRS, thermalized in a cryogenic stopping cell and transferred to a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) where high precision mass measurements were performed.

The masses of several fission and projectile fragments were measured (including short-lived nuclei with half-lives down to 18 ms) and the possibility of tailoring an isomerically clean beam for other experiments was demonstrated. With the demonstrated performance of the MR-TOF-MS and the expected production rates of exotic nuclei far from stability at the next-generation facilities such as FAIR, novel mass measurements of nuclei close to the neutron drip line will be possible and key information for understanding the r-process will be available.

The results from the last experiment and an outlook of possible future mass measurements close to the neutron drip line at FAIR with the MR-TOF-MS will be presented.