Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 37: Instrumentation IX

HK 37.3: Vortrag

Mittwoch, 16. März 2016, 14:45–15:00, S1/01 A3

Extending direct mass measurements in the region of the heaviest elements at SHIPTRAP — •Francesca Giacoppo for the SHIPTRAP collaboration — GSI, Darmstadt — Helmholtz Institut Mainz

Penning-trap mass spectrometry allows direct measurements of atomic masses with high precision. This technique is especially suitable to investigate the nuclear structure evolution of radioactive nuclides through binding energies.

The heaviest elements investigated so far in pioneering experiments with the SHIPTRAP setup at GSI, Darmstadt, have been nobelium and lawrencium [1,2]. The existence of such heavy nuclei is closely connected to the nuclear shell effects that stabilize them against spontaneous fission. The direct measurement of the masses of ^252−255No and ^255,256Lr has allowed mapping the evolution of the deformed subshell closure along N=152. In order to extend such studies to heavier and more exotic nuclides, the efficiency and sensitivity of the SHIPTRAP setup has to be further increased.

In this talk, an overview of the related developments will be presented. In particular, the online commissioning of a cryogenic buffer gas-stopping cell with improved efficiency will be reported [3].

[1] M. Block et al.,Nature 463 (2010) 785.

[2] E. Minaya Ramirez et al., Science 337 (6099) (2012) 1207.

[3] C. Droese et al., Nucl. Instr. Meth. Sec. B 338 (2014) 126.