X-ray spectrum due to the deexcitation of a muonic moleculepαμ

The x-ray spectrum due to the deexcitation of a muonic molecule pαμ with total angular momentum J=1 composed of ${}_{}{}^4{}_{}{}^{}\mathrm{He}$, ${}_{}{}^1{}_{}{}^{}\mathrm{H}$ (and its isotopes), and a muon is investigated. There is a small second peak in the spectrum of pαμ. The lifetime of the muonic molecules is three times longer than that determined by a previous calculation.