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Nuclear beta decays between (J^pi,T) = (0^+,1) analog states yield the bestvalue for the Vud element of the Cabibbo-Kobayashi-Maskawa matrix. Currentworld data establish the corrected Ft values of 14 separate superallowedtransitions to a precision of order 0.1% or better. The validity of the smalltheoretical correction terms is confirmed by excellent consistency among the 14Ft values and by recent measurements that compare pairs of mirror superallowedtransitions. With consistency established, the results now yield |Vud| =0.97420(21). This value is consistent with the considerably less preciseresults obtained from beta decays of the neutron, the pion and T=1/2 mirrornuclei, which are hampered by experimental challenges.

Nuclear beta decays and CKM unitarity