Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 18: Kernphysik / Spektroskopie

HK 18.2: Vortrag

Dienstag, 13. März 2007, 17:15–17:30, D

The 10⁺ Isomer in ⁵⁴Ni: Proton Emission and A=54 Mirror Symmetry — •Robert Hoischen^1,2 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 T_z = ± 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.