Invisible axion search in La-139 M1 transition

A search for invisible axions is carried out by looking for invisible M1 transitions in La139(5/2+→7/2+) with a transition energy of 166 keV. A limit to the branching ratio of axion emission to that of γ emission is obtained to be Γa/Γγ<1.21×10−6 at the 95% confidence level. Hadronic axions heavier than 26.7 keV are excluded by this upper limit. It is also concluded that the branching ratio of the second forbidden electron capture decay of Ce139 into the ground state of La139(7/2+) is less than 9.7×10−7 at the 95% confidence level.

lanthanum: radiative decay
radiative decay: lanthanum
lanthanum: rare decay
rare decay: lanthanum
lanthanum: branching ratio
lanthanum: energy levels
search for: axion
mass: axion
axion: mass
energy spectrum: (photon)

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Figures(0)

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