Abstract

We have obtained the decay asymmetry parameters in non-mesonic weak decay of polarized Λ-hypernuclei by measuring the proton asymmetry. The polarized Λ-hypernuclei, 5 Λ He, 12 Λ C, and 11 Λ B, were produced in high statistics via the ( π + , K + ) reaction at 1.05 GeV/ c in the forward angles. Preliminary analysis shows that the decay asymmetry parameters are very small for these s-shell and p-shell hypernuclei.

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