An error was made in the sign of the small contribution due to the nuclear magnetic moment to the transition probability. Accordingly, the sign in front of g^ðnÞ I in (3), (4), and (10) has to be changed. Table 1 must be corrected as follows. In accordance with Table 1, on the last page the lifetime in the case of²⁰⁷ Pb⁸¹⁺ must be corrected as t_theor = 52.00(3) ms. It should also be emphasized that (4) is intended only for calculating the decay rates in ions with positive values of the nuclear magnetic moment, as is the case in Table 1.