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Observation of two-photon emission in nuclear pion capture |
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| Authors: | J. Deutsch D. Favart M. Lebrun P. Lipnik P. Macq R. Prieels |
| Affiliation: | Institut de Physique, Université Catholique de Louvain, B-1348, Louvain-la-Neuve, Belgium |
| Abstract: | The emission of two photons above 25 MeV energy was observed in the capture of stopped pions by beryllium and carbon with a rate of (1.0 ± 0.1) × 10−5, respectively (1.4 ± 0.2) × 10−5 per capture. These rates are about two to four times greater than various free-nucleon estimates based on the π−+π+→γγ annihilation mechanism alone. |
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