BEXCO - Room F(201/202/203/204)
[NU094] Neutrino oscillation tomography of the Earth with KM3NeT/ORCA
KM3NeT/ORCA is a water-Cherenkov neutrino detector under deployment in the Mediterranean sea, off the shore of Toulon (France). The primary goal of ORCA is to measure the neutrino mass ordering by studying the angular and energy distributions of atmospheric neutrinos that cross the Earth. Such neutrinos undergo matter effects that modify the pattern of their oscillations, therefore also providing tomographic information on the Earth’s interior with an independent technique, complementary to the standard geophysics methods. In particular, the sensitivity to the electron density may allow to constrain the chemical composition of inner layers such as the outer core, for which no direct geophysical measurements are possible. We present here a study of the sensitivity of the ORCA detector to the electron density in the mantle, outer core and inner core of the Earth. Our study uses a full Monte Carlo simulation of the detector response. Preliminary estimations excluding systematic effects show that after ten years of operation the electron density can be measured with a statistical precision of 3-5% in the mantle and 7-10% in the outer core, depending on the mass ordering. We also evaluate the impact of systematic uncertainties related to oscillation parameters, neutrino flux, cross-sections and detector performance, including possible degeneracies in the density measurement of different layers.