Presented at the Symposium on New Trends in Nuclear and Medical Physics, Kraków, Poland, 18-20 October, 2023.

The PANTHEON project aims to test the Pauli Exclusion Principle (PEP) in nuclear reactions by searching for nuclear transitions prohibited by PEP in processes respecting the Messiah–Greenberg super-selection rule. The project aims at using the proton beam from the 3.5 MV Singletron accelerator of the Bellotti facility located at the Gran Sasso Underground Laboratory, to perform a measurement based on a test setup able to disentangle protons coming from the PEP-prohibited processes. The goal is to prepare a dedicated setup for future measurements to improve by orders of magnitude the limit on PEP violation established in previous studies and challenge theories beyond the Standard Model at a precision level presently unattained.