Résumé : A study has been made of K- meson interactions at rest in the CERN 1.1 m3 heavy liquid bubble chamber filled with a mixture of hydrocarbons. The data are used to determine (i) the internal conversion probability, C(Σ-), of Σ- hyperons produced in association with π+ mesons by K- meson interactions in carbon nuclei, (ii) the relative emission frequencies of (Σ+π-) and (Σ-π+) pairs, E(Σ+π-/Σ-π+), and the emission frequency E(Σ±π∓/K-), of (Σ±π∓) pairs per K- meson absorption in carbon, (iii) the branching fraction, P(Σ-π+/K-), for the primary process K- + p → Σ- + π+ in carbon and (iv) the trapping probability, T(Λ°), for Λ° hyperons produced by Σ- hyperon interactions in carbon nuclei. The results are: C(Σ-) = 0.38 ± 0.03, E(Σ+π-/gS-π+) = 1.25 +- 0.09, E(Σ±π-+/K-) = 0.164 ± 0.006, P(Σ-π+/K-) = 0.127 ± 0.004 and T(Λ°) = 0.13 ± 0.04, where the errors quoted are statistical and correspond to one standard deviation. Possible systematic errors were estimated to be at most of the same order of magnitude as the statistical uncertainties. © 1975.