In beam gamma-ray spectroscopy of fast exotic beams at the RIBF

At the Radioactive Isotope Beam Factory stable primary beams are accelerated up to 345 MeV/nucleon and incident on a production target to produce secondary beam cocktails with the fragment separator BigRIPS ranging from the lightest nuclei up to the uranium region. For in-beam gamma-ray spectroscopy, the secondary beams impinge on a reaction target at energies between 100 and 300 MeV/nucleon. Reaction residues are detected with the ZeroDegree spectrometer and gamma-rays detected with the NaI(Tl) based DALI2 array. In my presentation I will give an overview of recent experiments performed at the RIBF employing this technique including the measurements inside and beyond the ``Island of Inversion'' as well as investigations around the doubly-magic nuclei 100Sn, 78Ni and 132Sn. Besides discussing selected results a description of the setup and an overview of in-beam gamma-ray spectroscopy physics program at the RIBF will given.