Approximately 35 000 K~~ capture stars in an emulsion stack were examined for hyperfragments. A sample of 7r~-mesonic and nonmesonic He hyperfragments was selected for the purpose of estimating the nonmesonic-to-7r~"-mesonic decay ratios for AHe and for AHe 6 . The following values were obtained: Q(AHC) = 1.02±0.15, Q(AHe 5 ) = 1.21 ±0.19, for the nonmesonic-to-7r~ mesonic decay ratios of AHe and AHe 5 , respectively. Also, an attempt was made to estimate the ratio of proton stimulation to neutron stimulation for the nonmesonic decays of AHe and AHe 5 , for various cutoff energies of the observed "fast protons." Furthermore, by combining our data with previous results, we obtained estimates of the nonmesonic and the total decay rates of AHe 4 and AHe 5 .
Approximately 35 000 K~-capture stars in an emulsion stack were examined for hyperfragments. Using a mass selection criterion for all events, a sample of 13 7r~-mesonic decays and one nonmesonic decay of hydrogen hyperfragments was identified for the purpose of estimating the relative rates of decay for the 7r~-mesonic and nonmesonic modes.
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