Abstract
In spite of contradicting claims, the SIN beam dump experiment of Faissner et al. and the nuclear decay experiment of Zehnder could be compatible with each other, and with the existence of axions, if the isoscalar and isovector axion-nucleon couplings are of the same order of magnitude, i.e. the axion behaves like a photon in the sense that it does not couple to neutrons. This strongly suggests that the axion search should be continued via nuclear decays in single-proton or pure isoscalar or isovector transitions. The isovector reaction np → da at threshold is particularly attractive at light-water nuclear reactors.
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