Field-induced axion decay $a \to e^+ e^-$ via plasmon
  The axion decay $a \to e^+ e^-$ via a plasmon is investigated in an external magnetic field. The results we have obtained demonstrate a strong catalyzing influence of the field as the axion lifetime in the magnetic field of order $10^{15}$ G and at temperature of order 10 MeV is reduced to $10^4$ sec. 
N.V. Mikheev, A.Ya. Parkhomenko and L.A. Vassilevskaya