Search for solar axions produced by Primakoff conversion using resonant absorption by 169Tm nuclei

Abstract

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 → 169 Tm * → 169 Tm +γ (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 Aγ (GeV −1 ) · m A (eV ) ≤ 1.36 · 10 −5 (90% c.l.). In model of hadronic axion this restriction corresponds to the upper limit on axion mass -m A ≤ 191 eV for 90% c.l.

Constraints on the axion-electron coupling constant for solar axions appearing owing to bremsstrahlung and the compton process

“…The spectrum fit ting range was expanded to 16 keV. To describe the experimental spectrum in a wide range, function (6) was supplemented by a linear term for describing the continuous background and six Gaussians for describ ing the peaks of the characteristic Np X rays mani fested in the measurements [30]. The fit for m A = 5 keV is shown in Fig.…”

Search for resonant absorption of solar axions by atomic nuclei

“…All the limits are given at 95 % c.l. For more details on the calculation of the axion absorption rates, model parameter dependencies and result comparison see [1], [2] and [4].…”

“…These experiments are sensitive to g Aγ constant. The flux of Primakoff axions is parameterized by the following expression [1]: Fe target nuclei. The probability of emission and subsequent absorption of the axion in a M 1-type transition is determined only by the axion-nucleon coupling g AN .…”

Constraints on the axion-electron coupling for solar axions produced by a Compton process and bremsstrahlung

“…The attempts to observe the quasimonochromatic axions emitted in nuclear magnetic transitions were performed in Refs. [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. The reactions of the resonant excitation of nuclear levels, the axion-tophoton conversion, and the axioelectric effect have been used for detection.…”

“…The axions can be detected in the reaction of the resonant absorption by the 169 Tm nuclear target [35]. The 8.41 keV rays and conversion electrons produced by the deexcitation of the first nuclear level (Fig.…”