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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 Kaleja1,2, Brankica Andelic2,3,4, Luisa Arcila Gonzalez4, Joacquín Berrocal5, Lennart Blaauw4, Klaus Blaum6, Michael Block2,3,7, Pierre Chauveau2,3, Stanislav Chenmarev3,6, Premaditya Chhetri2,3, Christoph E. Düllmann2,3,7, Martin Eibach1, Julia Even4, Pavel Filianin6, Francesca Giacoppo2,3, Manuel J. Gutiérrez Torres5, Fritz P. Hessberger2,3, Nasser Kalantar-Nayestanaki4, Jacques J. W. van de Laar3,7, Mustapha Laatiaoui3,7, Steffen Lohse3,7, Enrique Minaya Ramirez8, Andrew Mistry2, Elodie Morin8, Yury Nechiporenko9,10, Dennis Neidherr2, Steven Nothhelfer3,7, Yuri Novikov9,10, Sebastian Raeder2,3, Elisabeth Rickert3,7, Daniel Rodríguez5, Lutz Schweikhard1, Peter G. Thirolf11, Jessica Warbinek2,7, and Alexander Yakushev2,31Univ. 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.

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