Hypernuclear production spectroscopy with an extended shell model

The ( e , e’K + ) reaction experiments with several nuclear targets performed recently at the Jefferson laboratory have provided high-resolution spectroscopic data. Among others, the 10 B( e , e’K +) 10 Λ Be reaction data are particularly interesting due to new appearance of extra sub-peaks which seem difficult to be explained within the conventional model with the p -shell nuclear naturalparity configurations. To describe this novel hypernuclear structure, we have extended the model space by introducing the new configurations which include unnatural-parity nuclear core-excited states. This configuration mixing successfully explains the sub-peaks in the 10 B( e , e’K +) reaction data. For adjacent hypernuclei with A = 9–11, we show the DWIA spectra of ( K − , π − ), ( π + , K + ) and ( γ , K + ) reactions that are calculated within the extended model in a consistent way. We discuss the theoretical spectra of 9,10 Λ Be and 11 Λ B production reactions.