A. Derbin, V. Muratova - Searches for solar axions using axioelectric effect in atoms and resonant absorption by nuclei
by
Alexander Derbin(Petersburg Nuclear Physics Institute), Valentina Muratova(Petersburg Nuclear Physics Institute)
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Europe/Rome
Pontecorvo room (LNGS)
Pontecorvo room
LNGS
Description
Recent results of searches for solar axions using the axioelectric effect in Bi atoms and the resonant absorption by $\rm{^{169}Tm}$ nuclei are presented.
The search for axioelectric absorption of 5.5 MeV solar axions produced in the $p(d, \rm{^3He})A$ reactions has been performed with a BGO-detectors placed in a low-background setup. A model-independent limit on an axion-nucleon and axion-electron coupling constants has been obtained: $|g_{Ae} \times g^3_{AN}|\leq 1.9 \times 10^{-10}$ for 90 % c. l..
The search for resonant absorption of solar axions by $^{169}\rm{Tm}$ nuclei have been performed. Such an absorption should lead to the excitation of low-lying nuclear energy level: $A+^{169}\rm{Tm} \rightarrow ^{169}\rm{Tm}^* \rightarrow ^{169}\rm{Tm} + \gamma$ (8.41 keV). The Si(Li) detector and $^{169}\rm{Tm}$ target placed inside the low-background setup were used for that purpose. As a result, a new model independent restrictions on the axion-nucleon, axion-photon and axion-electron couplings were obtained: $g_{A\gamma} \times|(g_{AN}^0+g_{AN}^3| \leq 9.2\times10^{-13}$ and $g_{Ae}\times|g^0_{AN}+ g^3_{AN}| \leq 2.1 \times 10^{-14}$ (90\% c.l.).
Perspectives of using the BGO scintillator bolometer and the Tm-containing bolometer are discussed.
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Alexander Derbin & Valentina Muratova
Petersburg Nuclear Physics Institute
