Observation of two-photon emission in nuclear pion capture
(1979) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 80B, n° 4-5, p. 347-349 (1979)
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- 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/sup -5/, respectively (1.4+/-0.2)*10/sup -5/ per capture. These rates are about two to four times greater than various free-nucleon estimates based on the pi /sup -/+ pi /sup +/ rarr gamma gamma annihilation mechanism alone.
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Deutsch, J., Favart, D., Lebrun, M., Lipnik, P., Macq, P., & Prieels, R. (1979). Observation of two-photon emission in nuclear pion capture. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 80B(4-5), 347-349. https://doi.org/10.1016/0370-2693(79)91186-9 (Original work published 1979)