Emulsion stacks of Ilford G-5 exposed to 7r~-meson and ir~-meson beams of the Berkeley Bevatron have been scanned for iT-meson and hyperon events. An event initiated by a 3.0-Bev TT~ meson is described which is interpreted as mesonic decay of a tritium hyperfragment according to the scheme: iH?*-+p-\-p+n+7r~+Q. All of the charged particles from the decay come to rest in the stack. The binding energy of the A 0 is found to be 1.4±0.6 Mev. Two additional cases of the same decay scheme are described, one produced in a iC~-capture star, another in a 4.3-Bev iT star, yielding binding energies B.E. (A 0 ) < 1.3±0.6 Mev and B.E. (A 0 ) =3.3±2.0 Mev, respectively. A weighted average of these three events gives B.E.(A°) = 1.4±0.5 Mev, and of all iH 3 * events reported, including those found by other workers, B.E.(A°)=0.5zfc:0.3 Mev.
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