In-beam and decay spectroscopy of transfermium nuclei

In recent years the body of experimental data on nuclei with masses A≃250A≃250 has increased dramatically. Nuclei that had been out of reach for experimental studies have now become available for study through a variety of approaches, both with in-beam spectroscopic methods and through spectroscopy following the decay of isomeric states or alpha decays at the focal plane of powerful separators. This article aims to collect the currently available experimental data on nuclei between Cm (Z=96)(Z=96) and Db (Z=105)(Z=105). The review of this data builds on the evaluations in the literature and focusses on those datasets obtained most recently.