Experimental Search for Solar Axions via Coherent Primakoff Conversion in a Germanium Spectrometer
Abstract
Results are reported of an experimental search for the unique, rapidly varying temporal pattern of solar axions coherently converting into photons via the Primakoff effect in a single crystal germanium detector. This conversion is predicted when axions are incident at a Bragg angle with a crystalline plane. The analysis of approximately 1.94 kg.yr of data from the 1 kg DEMOS detector in Sierra Grande, Argentina, yields a new laboratory bound on axion-photon coupling of gaγ γ < 2.7· 10-9 GeV-1, independent of axion mass up to ~ 1 keV.
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