CLAIRE’s first light

Abstract The objective of the RD the astrophysical target was a “standard candle”, the Crab nebula. CLAIRE’s first light consists of ∼33 diffracted photons from the Crab, corresponding to a 3σ detection. The performance of the gamma-ray lens during the balloon flight has been confirmed by ground data obtained at a 200 m long test range. Based on the diffraction efficiencies measured with CLAIRE, the mission concept of a space borne gamma-ray lens is proposed, and its potential for nuclear astrophysics is outlined.