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NuSTAR (Nuclear Structure, Astrophysics and Reactions) is an umbrella collaboration of more than 800 scientists from 146 institutions in 36 countries focusing on experiments using stage 1 of FAIR (Facility for Antiproton and Ion Research). NuSTAR comprises of nine different collaborations (AIC, DESPEC, ELISe, EXL, HISPEC, ILIMA, LaSpec, MATS and R3B) based around state-of-the art detector systems.

The common aim of NuSTAR is to exploit the beams of short-lived radioactive species to study how the properties of nuclei and nuclear matter vary over a wide range of isospin, angular momentum, temperature and density.  

Current experimental programmes concentrate on the SIS/FRS and UNILAC/SHIP facilities at GSI, supported by corresponding theoretical studies. The main goal is to develop, construct and operate the Super - FRS rare isotope beam facility and its related experimental set-ups at FAIR.