Search for high energy 5.5 MeV solar axions with the complete Borexino datasetстатья
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Дата последнего поиска статьи во внешних источниках: 23 января 2026 г.
Аннотация:A search for solar axions and axion-like particles produced in the p+d→3He+A (5.5 MeV) reaction was performed using the complete dataset of the Borexino detector (3995 days of measurement live-time). The following interaction processes have been considered: axion decay into two photons (A→2γ), inverse Primakoff conversion on nuclei (A+Z→γ+Z), the Compton conversion of axions to photons (A+e→e+γ) and the axio-electric effect (A+e+Z→e+Z). Model-independent limits on product of axion–photon (gAγ), axion–electron (gAe), and isovector axion–nucleon (g3AN) couplings are obtained: ∣gAγ×g3AN∣ ≤ 2.3 × 10^−11 GeV^−1 and ∣gAe×g3AN∣ ≤ 1.9 × 10^−13 at mA < 1 MeV (90% c.l.). The Borexino results exclude new large regions of gAγ, and gAe coupling constants and axion masses mA, and leads to constraints on the products ∣gAγ×mA∣ and ∣gAe×mA∣ for the KSVZ- and the DFSZ-axion models.