Hannover 2010 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 7: Präzisionsmassenspektrometrie und Anwendungen II

MS 7.4: Vortrag

Donnerstag, 11. März 2010, 11:30–11:45, F 428

First direct Penning trap mass measurements on nobelium and lawrencium — •Michael Dworschak¹, Michael Block¹, Dieter Ackermann¹, Klaus Blaum², Christian Droese³, Sergey Eliseev², Timo Fleckenstein⁴, Emma Haettner⁴, Frank Herfurth¹, Fritz-Peter Heßberger¹, Sigurd Hofmann¹, Jens Ketelaer⁵, Jochen Ketter⁵, Heinz-Jürgen Kluge¹, Gerrit Marx³, Marco Mazzocco⁶, Dmitriy Nesterenko⁷, Yuri Novikov^1,7, Wolfgang Plaß^1,4, Andrey Popeko⁸, Saidur Rahaman⁹, Daniel Rodríguez¹⁰, Christoph Scheidenberger^1,4, Lutz Schweikhard³, Peter Thirolf¹¹, Gleb Vorobyev¹, and Christine Weber⁹ — ¹GSI Helmholtzzentrum, Darmstadt — ²MPI für Kernphysik, Heidelberg — ³Universität Greifswald — ⁴Universität Gießen — ⁵Universität Mainz — ⁶INFN Sezione, Padova — ⁷PNPI RAS, Gatchina — ⁸JINR, Dubna — ⁹University of Jyväskylä — ¹⁰Universidad de Granada — ¹¹LMU, München

The mass measurements of the three nobelium isotopes ^252−254No and the lawrencium isotope ²⁵⁵Lr measured with the Penning trap mass spectrometer SHIPTRAP/GSI have been evaluated. These were the first direct mass measurements of transfermium elements ever performed. The results mark the first step in the exploration of masses of even heavier nuclides which is planned at SHIPTRAP. The main objective is to measure the endpoints of α-decay chains starting from superheavy nuclei in the region of the predicted island of stability. The SHIPTRAP results were compared with previous measurements based on α-decay chains and new literature values were obtained.