Emission of low-energy charged particles following negative-pion capture from rest

We have measured the inclusive production spectra of protons, deuterons and $\alpha$ particles following negative pion capture from rest in carbon, calcium, indium, and bismuth from low energies up to 55 MeV for protons and deuterons, and 30 MeV for $\alpha$ particles. The proton and deuteron spectra separate into contributions from direct processes and from evaporation. The integrated production rates are in agreement with previous results. The data are compared with various theoretical models.