We investigate the energy spectra of electron-positron pairs produced in bound-bound transitions of muonic atoms. These nonradiative transitions provide a distinctive mechanism of matter creation. Our spectral analysis demonstrates that the electron and positron spectra exhibit a strong dependence on the orbital angular momentum of the initial state. For transitions from excited $s$ states to the ground state, the spectra are governed primarily by the Coulomb interaction. In contrast, for transitions originating from $p$ and $d$ states, the Breit interaction is the dominant factor. Since pair production is strongest for $2p$ states, the Breit interaction ultimately determines the overall spectral shape.

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• Atomic spectra
• Electron & muon capture
• Electron & positron scattering
• Spontaneous emission
• Muonic atoms & molecules
• Muons
• Positrons