Inverse-Beta-Decay Reaction in the Antineutrino Flux from the Fragments of {sup 232}Th and {sup 233}U Fission

The energy spectra of antineutrinos produced in the beta decay of fragments originating from {sup 233}U and {sup 232}Th fission induced by neutrons are calculated. The relevant cross sections and the spectra of positrons produced in inverse beta decay are found. This study was motivated by the hypothesis (discussed over the past decade) that a self-sustained chain reaction proceeds at the center of the Earth ('georeactor'). According to the author of this hypothesis, the georeactor provides energy necessary for maintaining the Earth's magnetic field. It is {sup 235}U and, probably, {sup 232}Th and {sup 233}U that serve as a nuclear fuel in this reactor. Data obtained in the present study can be guidelines in future experiments aimed at testing the hypothesis of the georeactor and at estimating the composition of its nuclear fuel within the development of geophysical and astrophysical investigations based on the observation of antineutrino fluxes in nature.