  The effect of the electromagnetic radiation on the spontaneous charge
emission from heavy atomic nuclei is estimated in a model which may be relevant
for proton emission and alpha-particle decay in laser fields. Arguments are
given that the electronic cloud in heavy atoms screens appreciably the electric
field acting on the nucleus and the nucleus "sees" rather low fields. In these
conditions, it is shown that the electromagnetic radiation brings second-order
corrections in the electric field to the disintegration rate, with a slight
anisotropy. These corrections give a small enhancement of the disintegration
rate. The case of a static electric field is also discussed.
