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The photon spectrum from the pion capture reaction ..pi../sup -/ + t ..-->.. 3n + ..gamma.. was measured with a high-resolution pair-spectrometer to study the A = 3 system in a pure T = 3/2 state. The measured branching ratio (..pi../sup -/t ..-->.. nn..gamma..)/(..pi../sup -/t ..-->.. nnn..gamma.. or nnn) is 4.5 +- 0.8 percent. The shape of the photon spectrum is in satisfactory agreement with theoretical calculations which include final state interactions among the three neutrons. No evidence for a bound trineutron is found.

Photon Spectrum in Pion Capture on Tritium