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arXiv · 2509.01538

Hunting for Axions in REactor neutrino COherent scattering Detection Experiment

Wei Dai·Yuanlin Gong·Guanhua Gu·Liangliang Su·Li Wang·Lei Wu·Yongcheng Wu·Litao Yang
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Abstract

Nuclear power plants are not only vital sources of clean energy but also powerful facilities for probing new physics beyond the Standard Model. Due to the intense gamma-ray flux and an appropriate energy conditions, they are particularly well-suited for searches of light hypothetical particles such as sub-MeV axions and axion-like particles (ALPs). In this work, we propose to search for the ALPs in the REactor Neutrino COherent scattering Detection Experiment (RECODE), where two low-threshold, high-purity germanium detectors are placed at 11 m (near point) and 22 m (far point) from a 3.4 GW nuclear reactor at Sanmen nuclear power plant. With a 10 kg$\cdot$year exposure, we demonstrate that the expected sensitivities to the ALP couplings to the electrons and photons are competitive with or surpass the available results from the beam-dump experiments. A planned upgrade to 100 kg$\cdot$year will fully cover the so-called {$\it$ cosmological triangle} region, probing unexplored parameter space relevant to axions.

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Wei Dai, Yuanlin Gong, Guanhua Gu, Liangliang Su, Li Wang, Lei Wu, Yongcheng Wu, Litao Yang. 2025-09-01. Hunting for Axions in REactor neutrino COherent scattering Detection Experiment. https://arxiv.org/abs/2509.01538

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