A model combining pre-equilibrium and compound-nucleus emission is used to explain the observed emission of charged particles following $\mu$ capture from nuclei with $A\gtrsim 20$. The good agreement obtained constitutes additional evidence for a recently proposed distribution of the nucleon momenta in nuclei.

• Received 28 February 1978

DOI:https://doi.org/10.1103/PhysRevLett.41.18