Monopole, Astrophysics and Cosmic Ray Observatory

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

The active elements of MACRO were liquid scintillator and streamer tubes, optimized for high resolution tracking and timing.

[citation needed] The fact that a detector the size of multiple football pitches (MACRO) has not yet duplicated this feat leads most to disregard the earlier claim.

The exact voltage put on each plate was determined by a custom circuit board designed by some of the scientists involved with the project.

The type of signal and the speed through the "pool" of chambers told researchers if they had observed a monopole or merely some common charged particle.