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HK: Fachverband Hadronen und Kerne

HK 16: Nuclear Structure and Dynamics II

HK 16.3: Talk

Monday, March 16, 2009, 17:15–17:30, H-ZO 60

Mass measurements of No isotopes at SHIPTRAP — •Michael Dworschak — GSI Helmholtzzentrum, 64291 Darmstadt, Germany

The Penning trap mass spectrometer SHIPTRAP at GSI Darmstadt was set up for high-precision mass measurements of heavy radionuclides produced in fusion-evaporation reactions and separated from the primary beam by the velocity filter SHIP. Two interesting regions in the chart of nuclides that can be accessed by this production method are the region around the doubly magic ¹⁰⁰Sn and the region of elements heavier than uranium.

Recently, first mass measurements of the three nobelium isotopes ^252−254No (Z=102) - which were produced in the reaction ^206−208PbS(⁴⁸Ca,2n)^252−254No - were performed with the SHIPTRAP Penning trap mass spectrometer. These are the heaviest nuclides ever measured with Penning traps. The lowest production cross section was 400 nb (0.6 particles per second). The No nuclides are of importance to benchmark nuclear structure theories and to improve their predictions of the stability of super heavy elements that is caused by shell effects.