Search for solar axions by Primakoff effect with the full dataset of the CDEX-1B Experiment

TL;DR

This paper reports the first experimental limit on solar axion-photon coupling using the CDEX-1B detector, setting new constraints on axion properties with no observed excess signals.

Contribution

It provides the first limit on the axion-photon coupling constant using the Bragg-Primakoff effect with the CDEX-1B data, improving constraints on axion mass and coupling.

Findings

No excess signals observed in data.

Limits set on axion-photon coupling constant $g_{A o ext{gamma}}<2.08\times10^{-9}$ GeV$^{-1}$.

Excludes axion masses >5.3 eV/c$^2$ at 95 ext% confidence level.

Abstract

We present the first limit on $g_{A\gamma}$ coupling constant using the Bragg-Primakoff conversion based on an exposure of 1107.5 kg days of data from the CDEX-1B experiment at the China Jinping Underground Laboratory. The data are consistent with the null signal hypothesis, and no excess signals are observed. Limits of the coupling $g_{A\gamma}<2.08\times10^{-9}$ GeV$^{-1}$ (95\% C.L.) are derived for axions with mass up to 100 eV/$c^2$. Within the hadronic model of KSVZ, our results exclude axion mass $>5.3~\rm{eV}/c^2$ at 95\% C.L.