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Title: A New Approach to Detect Low-Energy Antineutrinos via Resonant Atomic–Nuclear Transitions
Authors: Evgeny Akhmedov, Thierry Lasserre, Leonardo Maturi
Abstract: We present a new method to detect low-energy antineutrinos based on resonant inverse orbital electron capture on nuclei. When the neutrino energy matches a discrete atomic–nuclear transition the cross section is strongly enhanced despite the weak interaction. For reactor antineutrinos the continuous energy spectrum ensures that the resonance condition is met for a fraction of the flux enabling sensitivity to the largely unexplored sub-MeV region below the inverse beta-decay threshold. The process provides a distinctive atomic–nuclear coincidence signature for background rejection. This approach opens a new avenue for low-energy antineutrino detection with applications to reactor monitoring and neutrino physics.