Fig. 2: Cross sections and expected geoneutrino measured spectra for the 1H, 35Cl, 63Cu and 106Cd inverse beta decay (IBD) targets.
From: Probing Earth’s missing potassium using the antimatter signature of geoneutrinos
a shows IBD reaction cross sections for the 4 different targets as a function of the incoming antineutrino energy, weighted by the corresponding target isotopic abundance (see Table 1). b shows the expected geoneutrino measured spectra at the Laboratori Nazionali del Gran Sasso (Italy), as an example site, originating from uranium, thorium and potassium distributed in the Earth’s lithosphere and mantle, calculated as described in the ‘Methods’ section. The expected geoneutrino spectra are given in Terrestrial Neutrino Units (TNUs). In both figures, the dashed vertical line indicates the endpoint of the potassium geoneutrino spectrum at 1.311 MeV.
