Köln 2004 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 2: Nuclear Structure/Spectroscopy I
HK 2.8: Talk
Monday, March 8, 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.