Fast rotating nuclei studies with Chateau de Cristal

The French 4πγ multidetector system Chateau de Cristal has been used since 1985 in numerous experiments devoted to nuclear shape change and shape coexistence at high angular momentum as well as nuclear reaction mechanism studies. In the first kind of measurements a Chateau of 38 counters associated to 12 Ge with Compton suppressors has been used while in the second case the γ-particle and multiplicity measurements were done with a Chateau of 74 counters. The individual counters of Chateau de Cristal are BaF2 crystals which we have developed for the first time as large γ detectors (efficient and fast). A summary of several experiments performed with Chateau de Cristal is presented. This data concern several fast rotating nuclei studies ranging from A ∼ 120 to A ∼ 200