Nuclear reactors are a powerful source of energy but also of interesting nuclear physics. The future of nuclear energy is intensely debated, but in the mean time new reactor types are proposed and investigated. They are expected to be safer and more reliable and produce less waste or even help to destroy the accumulated one. Their design requires new and more accurate data on neutron reactions (capture and fission) and also on decay data (beta delayed neutron fraction and energy released by the decay of fission products). Interestingly enough similar nuclear physics information is required to understand the evolution and death of stars and the fabrication of elements in the Universe (s-process and r-process). Nuclear reactors are also a powerful source of anti-neutrinos, which have been used by a new generation of experiments to demonstrate their oscillatory nature. They have revealed as well some anomalies, which could indicate “new physics” provided it is not due to more mundane nuclear physics phenomena. All this reveals a close connection between reactor technology, nuclear astrophysics and fundamental physics, which is more clearly shown by the fact that the same or very similar experiments can contribute to all of them. Examples of this will be shown.
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