Measurement of the muon flux in the bunker of Monte Soratte with the CRC detector

In the context of the Ptolemy project, the need for a site with a rather low cosmogenic induced background led us to measure the differential muon flux inside the bunker of Monte Soratte, located about 50 km north of Rome (Italy). The measurement was performed with the Cosmic Ray Cube (CRC), a portable tracking device. The simple operation of CRC was crucial to finalize the measurement, as it was carried out in a site devoid of scientific equipment and during the COVID-19 lockdown. The muon flux measured at the Soratte hypogeum is about two orders of magnitude lower than the flux observed on the surface, suggesting the use of the Soratte bunker for hosting astroparticle physics experiments in which a low environmental background is required.