Rostock 2019 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 8: Precision Mass Spectrometry

MS 8.1: Hauptvortrag

Donnerstag, 14. März 2019, 10:30–11:00, U A-Esch 2

Penning-Trap Mass Spectrometry of the Heaviest Elements with SHIPTRAP — •Oliver Kaleja^1,2,3, Brankica Andjelić^4,5, Olesya Bezrodnova^6,7, Klaus Blaum¹, Michael Block^2,3,5, Stanislav Chenmarev^2,6, Premaditya Chhetri^3,8, Christian Droese⁹, Christoph E. Düllmann^2,3,5, Martin Eibach^3,9, Julia Even⁴, Sergey Eliseev¹, Pavel Filianin¹, Francesca Giacoppo^3,5, Stefan Götz^2,3,5, Yuri Gusev⁶, Manuel Gutiérrez¹⁰, Frank Herfurth³, Fritz-Peter Hessberger^3,5, Nasser Kalantar-Nayestanaki⁴, Jadambaa Khuyagbaatar^3,5, Jacques J.W. van de Laar^2,5, Mustapha Laatiaoui⁵, Steffen Lohse^2,5, Natalia Martynova^6,7, Enrique Minaya-Ramirez¹¹, Andrew Mistry^3,5, Tobias Murböck³, Yuri Novikov^6,7, Sebastian Raeder³, Daniel Rodriguez¹⁰, Fabian Schneider^2,5, Lutz Schweikhard⁹, Peter Thirolf¹², and Alexander Yakushev^3,5 — ¹MPIK Heidelberg — ²JGU Mainz — ³GSI Darmstadt — ⁴KVI-CART/Univ. Groningen — ⁵HI Mainz — ⁶PNPI KI Gatchina — ⁷SPbSU St. Petersburg — ⁸TU Darmstadt — ⁹Univ. Greifswald — ¹⁰Univ. de Granada — ¹¹IPN Orsay — ¹²LMU München

Superheavy elements (Z≥104) owe their very existence to an enhanced stability resulting from nuclear shell effects. Direct high-precision Penning-trap mass spectrometry (PTMS) in this region can provide indispensable knowledge on the nuclear binding energy of these elements. This will eventually help to constrain theoretical predictions for the so-called island of stability, a region of long-lived nuclides expected around Z=114-126, N=184. However, due to their low production rates, PTMS of these elements requires the highest levels of efficiency and sensitivity. In a beam-time campaign in 2018, recent developments at SHIPTRAP allowed us to extend PTMS to heavier and more exotic nuclides with production rates as low as one ion per minute. For the first time, direct mass spectrometry of ²⁵¹No, ²⁵⁴Lr and the superheavy nuclide ²⁵⁷Rf (Z=104) were performed using the Phase-Imaging Ion-Cyclotron Resonance technique. The latter allowed to directly resolve the low-lying isomeric states ^251m,254mNo and ^254m,255mLr from their ground states. In this contribution an overview of the recent measurements will be given.