Proton decay of excited hypernuclei

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A re-analysis of emulsion data on K −12C → π −p 11 Λ B shows 12 Λ C ∗ states, strongly excited, which decay by proton emission, one having width Γ ⪅ 100 keV, the others Γ ∼ 500 keV. They are compared with the (K −, π −) in-flight reaction data for 12C and interpreted as the (0 ±,2 +,2 +) states of the configurations p 3 2 ) N −1( p j ) Λ . The most straightforward approach assigns the narrowest level to 0 + but this leaves one difficulty, so that the proper interpretation is not yet settled. There is moreover no similar narrow level observed in K −160 → π −16 Λ0 ∗ → π − p 15 Λ0 .