FIRST USE OF POST-ACCELERATED ISOMERIC BEAMS FOR COULOMB EXCITATION STUDIES OF ODD-ODD NUCLEI AROUND N=40.

We report on the first use of post-accelerated radioactive isomeric beams. Long-lived isomeric states in ⁶⁸Cu and ⁷⁰Cu have been produced and separated at ISOLDE, CERN. Subsequently they were post-accelerated to 2.86 MeV/u and sent to a target in the center of the MINIBALL spectrometer, used for the detection of the γ-rays of interest. The preliminary results from the Coulomb excitation of the I^π=6^-, 1⁺ states in ⁶⁸Cu and the I^π=6^- one in ⁷⁰Cu, compared to a large-scale shell model calculations, hint the importance of the excitations across the Z=28 gap for the understanding of the nuclear structure in the neutron-rich N=40 region. [ABSTRACT FROM AUTHOR]