SAMOP 2021 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 2: Precision Mass Measurements II

MS 2.3: Talk

Monday, September 20, 2021, 14:45–15:00, H3

High-Precision Mass Spectrometry of Superheavy Elements — •Oliver Kaleja^1,2, Brankica Andelic^2,3,4, Luisa Arcila Gonzalez⁴, Joacquín Berrocal⁵, Lennart Blaauw⁴, Klaus Blaum⁶, Michael Block^2,3,7, Pierre Chauveau^2,3, Stanislav Chenmarev^3,6, Premaditya Chhetri^2,3, Christoph E. Düllmann^2,3,7, Martin Eibach¹, Julia Even⁴, Pavel Filianin⁶, Francesca Giacoppo^2,3, Manuel J. Gutiérrez Torres⁵, Fritz P. Hessberger^2,3, Nasser Kalantar-Nayestanaki⁴, Jacques J. W. van de Laar^3,7, Mustapha Laatiaoui^3,7, Steffen Lohse^3,7, Enrique Minaya Ramirez⁸, Andrew Mistry², Elodie Morin⁸, Yury Nechiporenko^9,10, Dennis Neidherr², Steven Nothhelfer^3,7, Yuri Novikov^9,10, Sebastian Raeder^2,3, Elisabeth Rickert^3,7, Daniel Rodríguez⁵, Lutz Schweikhard¹, Peter G. Thirolf¹¹, Jessica Warbinek^2,7, and Alexander Yakushev^2,3 — ¹Univ. Greifswald — ²GSI Darmstadt — ³HIM Mainz — ⁴Univ. of Groningen — ⁵Univ. of Granada — ⁶MPIK Heidelberg — ⁷JGU Mainz — ⁸IJCLab Orsay — ⁹PNPI Gatchina — ¹⁰St. Petersburg Univ. — ¹¹LMU Munich

One of the keys in understanding the existence of superheavy elements with proton numbers Z ≥ 104 is the study of phenomena like nuclear shell effects far from stability. For these studies, one has to measure atomic masses at the borders of the nuclear chart very accurately. In 2021, the performance of the mass spectrometer SHIPTRAP at the GSI in Darmstadt was significantly improved. As a result, the atomic masses of several heavy At, Bi, Cf, Fr, Rn, Th, Po and Pb isotopes and the superheavy nuclides ²⁵⁷Rf (Z=104) and ²⁵⁸Db (Z=105) were measured directly. For many of these nuclides also long-lived isomeric states were observed allowing us to determine their excitation energy. In this contribution, an overview of the experimental improvements and results will be given.