Geo-neutrinos: recent developments

TL;DR

This paper reviews recent geo-neutrino observations and their implications for understanding Earth's radiogenic heat, especially in the mantle, highlighting recent measurements, models, and future observational strategies.

Contribution

It synthesizes recent geo-neutrino data, compares Earth model predictions, and discusses strategies for future observations to better understand Earth's internal heat sources.

Findings

Current geo-neutrino observations estimate mantle radiogenic heating.

Comparison shows consistency between measurements and Earth model predictions.

Discussion includes potential signals from Earth's core and observational strategies.

Abstract

Radiogenic heating is a key component of the energy balance and thermal evolution of the Earth. It contributes to mantle convection, plate tectonics, volcanoes, and mountain building. Geo-neutrino observations estimate the present radiogenic power of our planet. This estimate depends on the quantity and distribution of heat-producing elements in various Earth reservoirs. Of particular geological importance is radiogenic heating in the mantle. This quantity informs the origin and thermal evolution of our planet. Here we present: currently reported geo-neutrino observations; estimates of the mantle geo-neutrino signal, mantle radiogenic heating, and mantle cooling; a comparison of chemical Earth model predictions of the mantle geo-neutrino signal and mantle radiogenic heating; a brief discussion of radiogenic heating in the core, including calculations of geo-neutrino signals per pW/kg; and finally a discussion of observational strategy.