München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Hauptvorträge I

HK 2.3: Hauptvortrag

Montag, 18. März 2019, 12:25–13:00, Plenarsaal

Recent results on direct mass measurements of the heaviest elements with SHIPTRAP — •Francesca Giacoppo for the SHIPTRAP collaboration — GSI Darmstadt — HIM Mainz

During summer 2018 direct mass measurements of transfermium isotopes such as ²⁵¹No (Z=102), ²⁵⁴Lr (Z=103) as well as the first superheavy element ²⁵⁷Rf (Z=104) have been successfully achieved, for the first time, with the SHIPTRAP mass spectrometer. Moreover, exploiting the enhanced resolving power of the Phase-Imaging Ion-Cyclotron-Resonance technique, it was also possible to directly resolve, for the first time, the low-lying isomeric states ^251mNo and ^254m,255mLr and the K^π=8⁻ isomer ^254mNo with a Penning-trap system. These results will shed light on the nuclear shell effects that determine regions of enhanced shell stabilization as for instance nearby the deformed neutron shell at N=152 and are closely linked to the existence of such heavy nuclei as bound systems. Furthermore, such investigations will enable a better understanding of the nature of the underlying strong interaction at the upper limit of the nuclear chart and will help to constrain predictions for the next spherical shell closures, expected by different models around Z=114, N=184, the so-called island of stability.

Such challenging experiments face the problem of very low production rates, down to few ions per hour(s) which demand a very efficient ion preparation and manipulation, coupled with a high-detection sensitivity and resolving power. In this talk an overview of the latest optimization and enhanced performances of the SHIPTRAP setup will be presented together with the recent experimental results.