Increase in the probability of forbidden electron beta decays in a superstrong magnetic field

Form factors for unique forbidden electron beta decays in a superstrong constant uniform external magnetic field are considered. The probability of forbidden and allowed electron beta decays increases in a superstrong magnetic field owing to the increase in the density of vacant electron bound states at the nucleus involved. It is shown that, because of the growth of the form factors, the relative increase in the probability of forbidden electron beta decays in a magnetic field exceeds the relative increase in the probability of allowed decays (at identical decay endpoint energies).