Observation of double radiative capture on pionic hydrogen |
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Authors: | Tripathi S Armstrong D S Christy M E Clark J H D Gorringe T P Hasinoff M D Kovash M A Wright D H Zołnierczuk P A |
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Institution: | University of Kentucky, Lexington 40506, USA. |
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Abstract: | We report the first observation of double radiative capture on pionic hydrogen. The experiment was conducted at the TRIUMF cyclotron using the RMC spectrometer and detected gamma-ray coincidences following pi(-) stops in liquid hydrogen. We found the branching ratio for double radiative capture to be 3.05+/-0.27(stat)+/-0.31(syst)]x10(-5). The measured branching ratio and angle-energy distributions support the theoretical prediction of a dominant contribution from the pipi-->gammagamma annihilation mechanism. |
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