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The longitudinal form factors of the weak vector current of particles withspin $ J = 1/2 $ and isospin $ I = 1/2 $ are determined by the mass differenceand the charge radii of members of the isotopic doublets. The most promisingreactions to measure these form factors are the reactions with large momentumtransfers involving the spin-1/2 isotopic doublets with a maximum masssplitting. Numerical estimates of longitudinal form factors are given fornucleons and eight nuclear spin-1/2 isotopic doublets.

Longitudinal vector form factors in weak decays of nuclei