Superallowed 26Alm(β+ + EC)26Mg decay

Abstract The reaction energies of 25 Mg(n, γ) 26 Mg and 25 Mg(p, γ) 26 Al m have been measured as Q = 11093.24 6 and 6078.09 8 keV, respectively, which yields Q = 4232.81 10 keV for the 26 Al m ( β + + EC) 26 Mg decay energy. By combining it with the known 26 Al m half-life and by applying electromagnetic corrections one obatains F t = 3073.5 18 s for this superallowed 0 + → 0 + decay, in good agreement with the value for the 14 O “standard” 0 + → 0 + decay F t = 3075.18 16 s , thus resolving a long-standing discrepancy.