Abstract
The resonant absorption of solar axions by 57Fe nuclei, which is accompanied by the excitation of the first excited nuclear level: A + 57Fe → 57Fe* → 57Fe + γ(14.4 keV), is sought. To seek 14.4-keV photons, a Si(Li) detector and an enriched 57Fe target are used. The detector and target are placed in a low-background setup equipped with passive and active shieldings. As a result, a new upper limit m A ≤ 360 eV (at 90% C.L.) has been determined for the axion mass.
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Original Russian Text © A.V. Derbin, A.I. Egorov, I.A. Mitropol’sky, V.N. Muratova, N.V. Bazlov, S.V. Bakhlanov, D.A. Semenov, E.V. Unzhakov, 2007, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2007, Vol. 85, No. 1, pp. 15–20.
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Derbin, A.V., Egorov, A.I., Mitropol’sky, I.A. et al. Search for resonant absorption of solar axions emitted in an M1 transition in 57Fe nuclei. Jetp Lett. 85, 12–16 (2007). https://doi.org/10.1134/S0021364007010031
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DOI: https://doi.org/10.1134/S0021364007010031