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The reactions (n,~Be), (n, Be), and (Li, SB) on +Ca at E(n)=78 MeV and E( Li)=80 MeV were used to determine the mass excesses of 3Ar (-31. 98+ 0.07 MeV}, 4~Ar(-29.727 + 0.06 MeV}, and 48Ar (-29.732+ 0.07 MeV} by counter telescope techniques. Excited states in 4~Ar at 1.74+0.05, 2.55+0.05, 3.56+0.07, and 4.74+0.10 MeV and in 45Ar at 1.66+0.05, 2.42+0.05, and 3.25+ 0.07 MeV were also observed. Comparisons are made with mass predictions calculated from simple mass relations based on the shell model and with those obtained from the Garvey and Kelson approach. NUCLEAR REACTIONB~Ca(n, 'Be), {a 'Be) a=78 MeV; 8Ca( Li 'B) E=80