# Neutrino oscillation tomography of the Earth with KM3NeT-ORCA

## TL;DR

KM3NeT-ORCA aims to use atmospheric neutrino oscillations to perform Earth tomography, providing independent geophysical measurements of Earth's interior with high precision after a decade of data collection.

## Contribution

This work demonstrates the potential of neutrino oscillation data from KM3NeT-ORCA to measure Earth's internal electron density with high accuracy, offering a novel geophysical technique.

## Key findings

- Electron density in Earth's mantle measurable with 3-5% precision.
- Outer core electron density measurable with 7-10% precision.
- Potential to complement traditional geophysical methods.

## Abstract

KM3NeT-ORCA is a water-Cherenkov neutrino detector designed for studying the oscillations of atmospheric neutrinos, with the primary objective of measuring the neutrino mass ordering. Atmospheric neutrinos crossing the Earth undergo matter effects, modifying the pattern of their flavour oscillations. The study of the angular and energy distribution of neutrino events in ORCA can therefore provide tomographic information on the Earth's interior with an independent technique, complementary to the standard geophysics methods. Preliminary estimations based on a full Monte Carlo simulation of the detector response show that after ten years of operation the electron density can be measured with a precision of 3-5% in the mantle and 7-10% in the outer core - depending on the mass ordering.