[en] The half-lives of the Fermi superallowed β transitions of ³⁴Cl, ³⁸K/sub m/, ⁴²Sc, ⁴⁶V, and ⁵⁰Mn have been measured by multiscaling β rays detected in a plastic scintillator. The activities were produced in the reactions ³²S(t,n)³⁴Cl at E/subt/=3.0 MeV, ³⁵Cl(α,n)³⁸K/sub m/ at E/sub alpha/=8.0 MeV, ⁴²Ca(p,n)⁴²Sc at E/subp/=10 MeV, ⁴⁶Ti(p,n)⁴⁶V at E/subp/=10 MeV, and ⁵⁰Cr(p,n)⁵⁰Mn at E/subp/=10 MeV. Results for the half-lives (in msec) were as follows: ³⁴Cl, 1525.2 +- 1.1; ³⁸K/sub m/, 922.3 +- 1.1; ⁴²Sc, 680.98 +- 0.62; ⁴⁶V, 424.01 +- 0.47; and ⁵⁰Mn, 282.72 +- 0.26. Comparisons are made with previous measurements; the systematics of the superallowed Fermi β emitters are discussed. The value for the vector coupling constant g/sub beta//subV/subR/ including the ''inner'' radiative correction is deduced to be g/sub beta//subV/subR/= (1.41220 +- 0.00043) x 10^-49 erg cm³