Underground cosmic-ray measurement for morphological reconstruction of the “Grotta Gigante” natural cave

Measurement of the muon flux as a function of direction inside the Grotta Gigante natural cave near Trieste (Italy) was carried out using a tracking apparatus. The measured flux, depending in a well established way on the zenith angle and the rock mass crossed by the muons, allowed the determination of the shape of the cave vault which could be compared with that known from topography and related to the available microgravimetric data of the area.