Status of Euroball IV and selected results of first experiments

A short overview is presented of the status of EUROBALL IV. The new BGO inner ball and its performance is described. The main physics topics studied with this array are summarized. Three selected experiments are presented as an example. In 197Pb nucleus the spin gyromagnetic factor gseff was determined from M1 interband transitions between two signature partner superdeformed (SD) bands which are built on the ν[752]5/2- neutron intruder orbital; no g-factor quenching is observed; A ΔI = 4 bifurcation was observed in the dynamical moment of inertia of the yrast SD band of 150Tb; its amplitude is two times smaller than that in 149Gd yrast SD band; due to the occupation in 150Tb of the π63 proton intruder orbital; Interband transitions were observed between two triaxial SD bands in 163Lu. The excited band is a good candidate for a wobbling type of motion of the nucleus. (author)