Observation of New Neutron-Rich Isotopes by Fragmentation of 205-MeV/Nucleon<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ar</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>40</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>Ions

Yields of projectile fragments have been measured at 0\ifmmode^\circ\else\textdegree\fi{} for the reaction of 205-MeV/nucleon $^{40}\mathrm{Ar}$ ions on an 860-mg-${\mathrm{cm}}^{\ensuremath{-}2}$ carbon target. Mass resolution was achieved using a combination of magnetic analysis and energy-loss measurements. The isotopes $^{28}\mathrm{Ne}$ and $^{35}\mathrm{Al}$ have been observed for the first time.