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An analysis of emulsion data on the K− meson capture reaction on oxygen, K−16O → π−pΛ15N reveals the formation of two intermediate states of the hypernucleus Λ16O∗ which subsequently decay by proton emission. The states are relatively broad, as expected for Q-values of a few MeV, and are attributed to the 0+ and 2+ levels of Λ16O from the configurations [(p12)N−1 (p12,32) Λ] with Λ-binding energies equal to 1.54±0.09 MeV and 3.10±0.08 MeV, respectively, where BΛ for Λ15N is 13.59 MeV. The 2+-0+ BΛ difference is almost independent of the present statistical error (±0.15 MeV) on BΛ(Λ15N). Provided the state more abundantly produced is assigned to the 2+ level, their relative positions and production rates agree well with the theoretical predictions. A comparison with results from counter experiments is made. The extraction of the Λ spin-orbit splitting from the 2+-0+ energy difference is discussed using calculations for several different ΛN potentials. |
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