Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Struktur und Dynamik von Kernen

HK 18.1: Group Report

Monday, March 4, 2013, 16:45–17:15, HSZ-301

Isospin symmetry in the sd shell Coulomb excitation of ³³Ar and the new ’Lund-York-Cologne-Calorimeter’ — •Andreas Wendt and Peter Reiter — Institut für Kernphysik, Universität zu Köln

The ’Lund-York-Cologne-Calorimeter’ (LYCCA) is the first operational NUSTAR device for the HiSpec experiment at FAIR. LYCCA is a high efficient ToF-ΔE-E detector array for identification and tracking of exotic nuclei. After testing and commissioning of LYCCA the successful operation of LYCCA was achieved in first in-beam γ-ray spectroscopy experiments at GSI. A Coulomb excitation experiment using a relativistic, radioactive ³³Ar beam was performed employing LYCCA. The ³³Ar beam, produced by impinging a primary ³⁶Ar beam on a ⁹Be target, hit onto a secondary ¹⁹⁷Au target with an energy of approximately 145 MeV/u. γ-rays were observed by the Ge Cluster detectors of the PreSpec setup. LYCCA was employed to track the outgoing ions and to reject all nuclear reaction channels. B(E2) values for excited states in ³³Ar have been determined. These first experimental values for proton-rich T_z=−3/2 sd shell nuclei are used to test effective interactions for new shell model calculations, describing excitation energies of sd shell mirror pairs.

Supported by the German BMBF (06KY9136 TP7+TP1) and by the HGS-HIRe.