Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 37: Structure and Dynamics of Nuclei VII

HK 37.5: Talk

Wednesday, April 1, 2020, 17:45–18:00, J-HS E

High-precision mass spectrometry of superheavy elements at SHIPTRAP: latest results, status and outlook. — •Francesca Giacoppo for the SHIPTRAP collaboration — GSI Darmstadt — HIM Mainz

During the experimental campaign in summer 2018 the masses of ²⁵¹No and ²⁵⁴Lr has been directly measured for the first time at the mass spectrometer SHIPTRAP at GSI. In addition, the long-lived, low-lying isomeric states ^251mNo and ^254m,255mLr have been probed with high accuracy. This was made possible by the first application of the Phase-Imaging Ion-Cyclotron-Resonance (PI-ICR) technique in the region of the heaviest elements. Thus, with its superior mass resolving power and precision, the PI-ICR technique was established as a complementary tool to decay spectroscopy. Furthermore, with its high efficiency the PI-ICR technique allowed a first mass measurement of the ground state of ²⁵⁷Rf, and thereby opened the doorway to the exotic superheavy elements which are characterized by their particularly low production yields.

In the meantime, the SHIPTRAP setup has been prepared for the next beam time scheduled for early 2020. It is planned to look for low-lying states of the Rf isotopes as well as to extend direct high-precision mass spectrometry to even heavier and more exotic nuclides, including Dubnium (Z=105).

In this contribution, an overview on the latest efficiency optimization of SHIPTRAP together with the status of the 2020 campaign will be reviewed.