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Axion-induced pair production: A new strategy for axion detection
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We revisit and update the axion-induced pair production process in a nuclear electric field mediated by the axion-electron coupling, a þ A ZX → A ZX þ eþ þ e−. This process emerges as one of the most efficient channels for detecting axions with energies above a few MeV in large underground detectors. It is particularly relevant for detecting axions produced in nuclear reactions, such as the p þ d → 3 He þ að5.5 MeVÞ reaction in the solar pp-chain, and for axions originating in supernovae. Despite recent interest in detecting high-energy axions, the pair production process has received limited attention, even in scenarios where it is the dominant detection channel. This study fills this gap by demonstrating that pair production is a highly effective detection mechanism for high-energy axions. We apply our results to axions from supernovae and the solar 5.5 MeV line, recasting the current bounds of Borexino and comparing the detection capabilities of the JUNO and Hyper-Kamiokande detectors.
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ARIAS-ARAGÓN, Fernando, GIANNOTTI, Maurizio, GRILLI DI CORTONA, Giovanni, MESCIA, F. (federico). Axion-induced pair production: A new strategy for axion detection. _Physical Review D_. 2025. Vol. 111, núm. 1-13. [consulta: 14 de gener de 2026]. ISSN: 1550-7998. [Disponible a: https://hdl.handle.net/2445/220379]