Gießen 2007 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 18: Kernphysik / Spektroskopie
HK 18.2: Talk
Tuesday, March 13, 2007, 17:15–17:30, D
The 10+ Isomer in 54Ni: Proton Emission and A=54 Mirror Symmetry — •Robert Hoischen1,2 and Dirk Rudolph1 for the RISING collaboration — 1Department of Physics, Lund University, S-221100 Lund, Sweden — 2Gesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, Germany
Within the first RISING Stopped-Beam Campaign, exotic nuclei were produced using relativistic projectile fragmentation of a 550 MeV/u beam of 58Ni provided by the SIS synchrotron at GSI. The fragments were separated and identified event-by-event using the FRagment Separator (FRS), and their decay was observed by the high-efficiency, high-granularity RISING γ-ray spectrometer in a compact configuration.
Time-correlated γ decays from individually identified nuclear species have been measured, allowing a clean identification of isomeric decays in a range of exotic nuclei along the proton drip-line. The presentation concentrates on the study of isospin symmetry in the Tz = ± 1 system 2854Ni26 – 2654Fe28. This includes the first observation of isomeric proton radioactivity produced in fragmentation reactions, which competes with γ-ray emission from the newly established 10+ isomeric state in 54Ni. This state represents the mirror state to a well-known 10+ isomer in 54Fe. The impact of these results is discussed based on large-scale shell-model calculations.