Monopole, Astrophysics and Cosmic Ray Observatory

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MACRO, or the Monopole, Astrophysics and Cosmic Ray Observatory, is a particle physics experiment located at the Laboratori Nazionali del Gran Sasso in Abruzzo, Italy.

The primary goal of MACRO is to search for magnetic monopoles. The active elements of MACRO are liquid scintillator and streamer tubes, optimized for high resolution tracking and timing. This design also allows MACRO to operate as a neutrino detector and as a cosmic ray observatory.