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HK: Physik der Hadronen und Kerne

HK 2: Nuclear Structure/Spectroscopy I

HK 2.8: Vortrag

Montag, 8. März 2004, 18:15–18:30, A

First results of the secondary-fragmentation technique within the RISING project — •Frank Becker¹, M.A. Bentley², and G. Hammond² — ¹GSI Darmstadt, Planckstr. 1, Darmstadt, Germany — ²School of Chemistry and Physics, Keele University, Staffordshire, ST5 5BG, UK

The medium mass N=Z−3 nuclei provide information on the Coulomb effects at a large proton excess as well as a rigorous test of the shell model. In the first campaign of the new RISING project, nuclei in this mass region were produced by secondary-fragmentation. A ⁵⁸Ni beam at 600 MeV/A impinges on a ⁹Be target at the entrance of the FRS FRagment Separator at GSI. The FRS selects the fragments of interest, in our case ⁵⁵Ni or ⁵⁵Co and guides them to the focal plane of the spectrometer. There, the selected fragments reach a second ⁹Be target which is in the view of an array of EUROBALL CLUSTER detectors. In this second target exotic nuclei are produced in a further fragmentation step, inter alia the mirror pair ⁵³Mn/⁵³Ni. Gamma rays associated with nuclei produced in the secondary reactions have been measured with the CLUSTER detectors, and the nuclei themselves have been identified by mass and charge in a new CAlorimeter TElescope (CATE). This device is composed of a Si array followed by a CsI(Tl) scintillator array. The latest results will be presented.