Abstract: A Beam Shaping Assembly model was proposed by the Neutrons for Medicine and Scientific applications project for its application to Boron Neutron Capture Therapy. The first experimental test of the core moderator was performed at the MONNET facility at the Joint Research Centre in Geel, Belgium. To this end, the conducted experiment had three main goals: first, an energy and angular characterization of the 7Li(p,n) at 2.1 MeV; second, the validation of the magnesium fluoride (MgF2) total cross-section following transmission measurements through thin samples; third, the measurement of the moderation capabilities of MgF2 after irradiating several blocks of the material. All measurements used a lithium glass detectors with the time-of-flight technique. Monte Carlo simulations were done to calculate the necessary corrections, as well as several checks and further analysis. In this work we illustrate the chronology in all these sequential steps.