Lifetimes of Light Hyperfragments. II

We have continued our studies of the lifetimes of light hyperfragments. Our analysis is based on a total sample of 1476 mesonic decays of hyperfragments, of which 77 decayed in flight. The values we found for the mean lives are the following: τ(_ΛH³)=(2.85_-1.05+1.27)×10^-10 sec, using both two-body and three-body decays; τ(_ΛH⁴)=(2.68_-1.07+1.66)×10^-10 sec, using only three-body decays; τ(_ΛHe⁴)=(2.28_-1.29+2.33)×10^-10 sec; τ(_ΛHe⁵)=(2.51_-0.73+1.90)×10^-10 sec; and τ(_ΛHe4,5)=(2.43_-0.43+0.60)×10^-10 sec for the combined mean life of all the _ΛHe⁴ and _ΛHe⁵ events. The last lifetime quoted contains only a statistical error. The others, in addition, contain in their errors the effects due to uncertainties in our knowledge of the bias for two-body events and of the separation of ambiguous three-body events. All the results are in good agreement with theoretical calculations of hyperfragment lifetimes.