The search for resonant absorption of the Primakoff solar axions by $^{ 169}$Tm nuclei have been performed. Such an absorption should lead to the excitation of low-lying nuclear energy level: $A+^{ 169}$Tm $\to ^{ 169}$Tm$^*$ $\to ^{ 169}$Tm$ + \gamma$ (8.41 keV). The Si(Li) detector and $^{ 169}$Tm target placed inside the low-background setup were used for that purpose. As a result, a new restriction on the axion-photon coupling and axion mass was obtained: $g_{ A\gamma}({ GeV}^{ -1})\cdot m_A(eV)\leq1.36\cdot10^{ -5}$ (90% c.l.). In model of hadronic axion this restriction corresponds to the upper limit on axion mass - $m_A\leq$ 191 eV for 90% c.l.
Categories: hep-ph hep-ex