Isospin symmetry in the sd shell Coulomb excitation of 33Ar and the new 'Lund-York-Cologne-Calorimeter'

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 Tz = -(3)/(2) sd shell nuclei are used to test effective interactions for new shell model calculations, describing excitation energies of sd shell mirror pairs.