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Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 67: Poster Session

HK 67.50: Poster

Donnerstag, 19. März 2009, 14:00–16:00, Audi-Max

Evidence for an isomeric 3/2 state in 53CoDirk Rudolph1 and •Robert Hoischen1,21Department of Physics, Lund University, S-22100 Lund, Sweden — 2Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany

The fragmentation of a 550 MeV/u primary beam of 58Ni on a 9Be target has been used to measure time- and energy-correlated γ decays following the implantation of event-by-event discriminated secondary fragments into a 9Be stopper plate. A new isomeric γ decay with T1/2=14(46) ns and Eγ=646.2(2) keV is observed and attributed to the decay of the yrast 3/2 state in 2753Co26. This short-lived isomeric state has been populated by means of nuclear reactions during the stopping process of the secondary fragments. The experimental findings are discussed in the framework of large-scale spherical shell-model calculations in conjunction with isospin symmetry breaking residual interactions for the A=53, Tz=± 1/2 mirror nuclei 53Co and 53Fe.

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