Geoneutrinos and Hydridic Earth (or primordially Hydrogen-Rich Planet)

TL;DR

This paper explores how geoneutrino measurements can differentiate between Earth composition models, providing error estimation formulas and required exposure times for various underground laboratories.

Contribution

It introduces a simple formula for estimating the error in Th/U signal ratio and assesses the exposure needed to distinguish Earth models using geoneutrino data.

Findings

Over 22 kt·year exposure needed at Gran-Sasso and SNO

Over 27 kt·year exposure needed at Kamioka with nuclear plants stopped

Error estimation formula for Th/U signal ratio

Abstract

Geoneutrino is a new channel of information about geochemical composition of the Earth. We alnalysed here the following problem. What statistics do we need to distinguish between predictions of Bulk Silicate Earth model and Hydridic Earth model for Th/U signal ratio? We obtained the simple formula for estimation of error of Th/U signal ratio. Our calculations show that we need more than $22 kt \cdot year$ exposition for Gran-Sasso underground laboratory and Sudbury Neutrino Observatory. We need more than $27 kt \cdot year$ exposition for Kamioka site in the case of stopping of all Japanese nuclear power plants.