SMuK 2021 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Structure and Dynamics of Nuclei II

HK 30.7: Talk

Friday, September 3, 2021, 16:00–16:15, H4

High-precision mass spectrometry of heavy and superheavy nuclides at SHIPTRAP: overview of the latest experiments — •Francesca Giacoppo for the SHIPTRAP collaboration — GSI Darmstadt, Germany — HIM Mainz, Germany

In 2018 high-precision Penning Trap Mass Spectrometry (PTMS) crossed the doorway towards the region of superheavy elements (Z≥104) with the first direct mass measurement of the ground state of ²⁵⁷Rf accomplished with a small number of detected ions (<10) with the SHIPTRAP setup. This was made possible by the first application of the highly efficient Phase-Imaging Ion-Cyclotron-Resonance (PI-ICR) technique in the region of the heaviest nuclides. In addition, exploiting the superior mass resolving power and precision of PI-ICR, several low-lying isomeric states in elements with Z=102−103 have been probed with high accuracy. These results have been achieved thanks to careful investigations and improvements of the efficiency of the SHIPTRAP setup. In an online run in 2020, the rate of ²⁵⁷Rf extracted from the cryogenic gas cell was increased by about an order of magnitude. This boost allowed in the latest campaign in spring 2021 to carefully investigate both the ground state and the low-lying isomer of ²⁵⁷Rf and the more exotic element dubnium with Z=105, available at even lower yields. The PI-ICR technique, established nowadays as a complementary tool to decay spectroscopy, was also applied to disentangle many isomeric states in heavy nuclei with Z=82−98. In this contribution, the results of the latest campaigns performed within the FAIR Phase-0 program will be reviewed.