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Search for solar axions using Li-7

M. Krcmar·Z. Krecak·A. Ljubicic·M. Stipcevic·D. A. Bradley
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Abstract

We describe a novel approach to the search for solar, near-monochromatic hadronic axions, the latter being suggested to be created in the solar core during M1 transitions between the first excited level of Li-7, at 478 keV, and the ground state. As a result of Doppler broadening, in principle these axions can be detected via resonant absorption by the same nuclide on the Earth. Excited nuclei of Li-7 are produced in the solar interior by Be-7 electron capture and thus the axions are accompanied by emission of Be-7 solar neutrinos of energy 384 keV. An experiment was made which has yielded an upper limit on hadronic axion mass of 32 keV at the 95% confidence level.

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M. Krcmar, Z. Krecak, A. Ljubicic, M. Stipcevic, D. A. Bradley. 2001-09-10. Search for solar axions using Li-7. https://doi.org/10.1103/physrevd.64.115016

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