In-beam gamma spectroscopy of very neutron-rich nuclei at GANIL

The structure of nuclei far from stability can be investigated by means of in-beam gamma spectroscopy using both stable and radioactive beams. A γ-array consisting of BaF2 and Ge detectors have been used at GANIL in order to perform two of such experiments: i) Secondary beams of neutron-rich Ge, Zn and Ni isotopes around N=40 were produced from the fragmentation of a primary 86Kr beam, and analyzed by means of the LISE3 spectrometer. For the transitions between the O+ ground state and the first 2+ state, B(E2) values have been extracted from Coulomb excitation cross-section measurement..Some of the obtained results related to the effectiveness of the N=40 spherical sub-shell closure as well as future improvements of the quality of the data are discussed. ii) In-beam γ-spectroscopy of neutron-rich nuclei around 32Mg produced by fragmentation of 36S have been recently performed. Gamma decay of relatively higher excited states have been measured in a large number of exotic light nuclei. Preliminary results o...