Inverse beta decay reaction in 232 Th and 233 U fission antineutrino flux

Energy spectra of antineutrinos coming from 232Th and 233U neutroninduced fission are calculated, relevant inverse beta decay ν̄e + p → n+e+ positron spectra and total cross sections are found. This study is stimulated by a hypothesis that a self-sustained nuclear chain reaction is burning at the center of the Earth (“Georeactor”). The Georeactor, according to the authors of this idea, provides energy necessary to sustain the Earth’s magnetic field. The Georeactor’s nuclear fuel is 235U and, probably, 232Th and 233U. Results of present study may appear to be useful in future experiments aimed to test the Georector hypothesis and to estimate its fuel components as a part of developments in geophysics and astrophysics based on observations of low energy antineutrinos in Nature. Introduction A revolutionary progress in antineutrino (ν̄e) detection technique demonstrated by KamLAND Collaboration [1] opens a real opportunities to study ν̄e fluxes of natural origin and obtain information on their sources, which is otherwise inaccessible. The Baksan Underground Observatory of the Institute for Nuclear Research RAS (BNO), as discussed in [2], is one of the most promising sites to build a massive antineutrino scintillation spectrometer for these studies. The research program can include: