Recent results of search for solar axions using resonant absorption by $^{83}$Kr nuclei

TL;DR

This paper reports on a search for solar axions via resonant absorption in $^{83}$Kr nuclei, setting new upper limits on axion-nucleon couplings and axion mass based on experimental data from a low-background detector.

Contribution

The study provides the first model-independent upper limit on axion-nucleon couplings using $^{83}$Kr and establishes a new upper bound on the hadronic axion mass.

Findings

Upper limit on axion-nucleon coupling: |g_3 - g_0| ≤ 8.4×10⁻⁷

New upper limit on axion mass: m_A ≤ 65 eV (95% C.L.)

Experimental setup with low-background proportional counter at Baksan Neutrino Observatory

Abstract

A search for resonant absorption of the solar axion by $^{83}\rm{Kr}$ nuclei was performed using the proportional counter installed inside the low-background setup at the Baksan Neutrino Observatory. The obtained model independent upper limit on the combination of isoscalar and isovector axion-nucleon couplings $|g_3-g_0|\leq 8.4\times 10^{-7}$ allowed us to set the new upper limit on the hadronic axion mass of $m_{A}\leq 65$ eV (95\% C.L.) with the generally accepted values $S$=0.5 and $z$=0.56.