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HK: Fachverband Hadronen und Kerne

HK 16: Nuclear Structure and Dynamics II

HK 16.4: Vortrag

Montag, 16. März 2009, 17:30–17:45, H-ZO 60

Spectroscopy of Transfermium Isotopes at SHIP — •Stanislav Antalic¹, Fritz Peter Heßberger², Sigurd Hofmann^2,3, Dieter Ackermann², Sophia Heinz², Birgit Kindler², Ivan Kojouharov², Bettina Lommel², Rido Mann², Štefan Šáro¹, Branislav Streicher², Barbara Sulignano⁴, and Martin Venhart¹ — ¹Comenius University, Bratislava, Slovakia — ²GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — ³Goethe-Universität, Frankfurt am Main, Germany — ⁴CEA-Saclay, DAPNIA/SPhN, Gif-sur-Yvette Cedex, France

Recent developments of experimental techniques suited for α-, γ- and CE spectroscopy now allow to study nuclear structure in the region of trans-fermium nuclei. This opened the door to investigate nuclear structure under extreme conditions of heaviest nuclei (Z>100, A>250).

Most interesting examples are studies of K-isomers. Experiments aimed to investigate such phenomena provide important information on the nuclear structure of the heaviest elements and are stringent tests for the quality of nuclear models.

In this contribution the results from studies of multi-quasi-particle isomeric states in ²⁵³No and ²⁵⁵Lr performed at SHIP will be presented in detail. Both nuclei are first odd-mass isotopes in the trans-fermium region for which high K-isomers were observed. By decay of the high K-isomer in ²⁵³No a rotational band was populated, which was not seen in previous in-beam studies. Additionally, also the recent results on the single particle level systematics for the N = 149, 151 and 153 isotones will be presented.