Oct 3 – 7, 2022
Science Culture Center, IBS
Asia/Seoul timezone

Extending the reach of the mass spectrometer SHIPTRAP towards superheavy elements

Oct 4, 2022, 8:16 PM
S236 (Science Culture Center, IBS)


Science Culture Center, IBS

55 EXPO-ro, Yuseong-gu, Daejeon
Poster Session Poster Session


Manuel J. Gutiérrez (GSI / HIM)


The ultimate boundary of existence of chemical elements remains an open question. The heaviest elements known to date, called Superheavy Elements (SHEs, with $Z>103$), owe their existence to the stabilizing effect of nuclear shells, which counteracts the strong Coulomb repulsion that would otherwise cause their immediate fission. The SHIPTRAP mass spectrometer, placed behind the SHIP separator at GSI (Darmstadt, Germany), has been used to measure the masses of several isotopes of elements up to dubnium and, through these, to study the evolution of the shell gaps in the region around $Z=100$ and $N=152$. Thanks to mass resolving powers of over $10^7$ it was also possible to resolve and to characterize several low-lying long-lived isomeric states. Lighter nuclides were studied as well, allowing, for example, the identification of a predicted isomer in californium-241 and the study of the alpha-decay chains stemming from francium-206 and 204, where some previously uncertain isomeric excitation energies have been determined.

The shell-structure investigations of the heaviest nuclides can be complemented by mass measurements of long-lived actinide isotopes. Recently, uranium and plutonium isotopes obtained by laser ablation from drop-on-demand targets have been studied. These measurements included a detailed study of systematic uncertainties in mass measurements for cases with large mass-to-charge ratio differences to the closest suitable reference ion. These problems could be circumvented if the actinide ions were available as doubly charged atomic ions. In that case, stable isotopes from tin or cesium, whose masses are well known, could be used as references.

In this contribution, the latest mass measurements obtained at SHIPTRAP will be presented. In addition, the long-term efficiency of the setup will be addressed. This is fundamental for the study of even heavier nuclei, produced with lowest rates. Furthermore, the development of a compact gas cell to extract doubly-charged actinides (emitted from a radioactive recoil source placed inside the active gas volume) will be introduced.

Primary authors

Manuel J. Gutiérrez (GSI / HIM) Brankica Andelic (GSI / University of Groningen) Luisa Arcila González (University of Groningen) Joaquín Berrocal (Universidad de Granada) Lennart Blaauw (University of Groningen) Klaus Blaum (MPIK) Michael Block (GSI / HIM / JGU Mainz) Pierre Chauveau (GANIL) Stanislav Chenmarev (MPIK / HIM / PNPI) Christoph E. Düllmann (GSI / HIM / JGU Mainz) Martin Eibach (GSI) Julia Even (University of Groningen) Pavel Filianin (MPIK) Francesca Giacoppo (GSI / HIM) Fritz P. Heßberger (GSI / HIM) Nasser Kalantar-Nayestanaki (University of Groningen) Oliver Kaleja (GSI / HIM / MPIK / University of Greifswald) Kanika (GSI / University of Heidelberg) Jacques J.W. van de Laar (GSI / HIM / JGU Mainz) Mustapha Laatiaoui (HIM / JGU Mainz) Steffen Lohse (GSI / HIM / JGU Mainz) Enrique Minaya Ramírez (ICJLab / CNRS, UPS) Andrew Mistry (GSI) Elodie Morin (ICJLab / CNRS, UPS) Yury Nechiporenko (PNPI / Saint Petersburg State University) Dennis Neidherr (GSI) Steven Nothhelfer (GSI / HIM / JGU Mainz) Yuri Novikov (PNPI / Saint Petersburg State University) Wolfgang Quint (GSI / University of Heidelberg) Sebastian Raeder (GSI / HIM) Dennis Renisch (HIM / JGU Mainz) Elisabeth Rickert (HIM / JGU Mainz) Daniel Rodríguez (Universidad de Granada) Niladri Roy (GSI / ELEMENTS Cluster/ JGU Mainz) Lutz Schweikhard (University of Greifswald) Peter G. Thirolf (LMU Munich) Jessica Warbinek (GSI / HIM / JGU Mainz) Alexander Yakushev (GSI / HIM)

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