[en] Recent in-beam experiments with heavy ions leading to mass measurements and spectroscopic studies of light nuclei very far from the region of beta stability are reviewed. The detection of resonance particles as low-yield reaction products is discussed first. Heavy-ion reactions producing multineutron final states are then taken up. Energy spectra are shown for the ⁷Li(⁷Li,¹¹B)T, ⁷Li(⁷Li,¹¹C)3n, and ⁷Li(⁷Li,¹⁰C)4n reactions at 79.6 MeV. Several excited states were seen in the (⁷Li,¹¹B) reaction, but no structure was visible in the (⁷Li,¹¹C) reaction. Upper limits for the production of trineutrons and tetraneutrons in these experiments were 70 and 30 nb, respectively. Other multinucleon transfer reactions are then considered, with emphasis on two-proton-pickup reactions and exotic rearrangement reactions. Energy spectra are shown for the following reactions: ⁴⁸Ca(⁶Li,⁸B)⁴⁶Ar at 80 MeV; (⁶Li,⁸B) on ¹¹B, ⁹Be, and ¹²C at 80 MeV; (¹¹B,⁸B) on ²⁶Mg and ²⁸Si at 86 MeV; ²⁶Mg(α,⁸He)²²Mg at 110 MeV; (α,⁸He) on ¹²C and ²⁴Mg at 156 MeV; ¹⁴C(¹⁸O,¹²Be)²⁰Ne at 88.7 MeV; ²⁶Mg(⁷Li,⁸B)²⁵Ne at 78.9 MeV; and ⁹Be(⁹Be,⁸B)¹⁰Li at 120 MeV. Finally, predictions made by using the shell model and the relations of Garvey et al. are compared with measured masses for T/sub Z/= ⁵/₂ nuclei in the 2s--1d shell. (19 figures) (U.S.)