Hypernuclear production spectroscopy with an extended shell model

¹ Liberal Arts and Sciences, Nippon Institute of Technology, 345-8501 Miyashiro, Saitama, Japan
² Research Center for Nuclear Physics, Osaka University, 567-0047 Ibaraki, Osaka, Japan
³ Laboratory of Physics, Osaka Electro-Communication University, 572-8530 Neyagawa, Japan
⁴ Faculty of Medicine, Miyazaki University, 889-1692 Miyazaki, Japan
⁵ Faculty of Education, Gifu University, 501-1193 Gifu, Japan

^* e-mail: aumeya@nit.ac.jp

Published online: 9 November 2022

Abstract

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 ¹⁰B(e, e’K+) ¹⁰_ΛBe 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 ¹⁰B(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_ΛBe and ¹¹_ΛB production reactions.