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    Structural analysis of the states within the “bump” regions in the BeΛ10 spectrum via a control neural network

    Zhengri Liu1,2, Jiaqi Tian1,2, Mengjiao Lyu1,2,*, Masahiro Isaka3, Akinobu Doté4,5,6, Takayuki Myo7,8, Hisashi Horiuchi7, Hiroki Takemoto9, Niu Wan10 et al.

    Qing Zhao11

    • *Contact author: mengjiao.lyu@nuaa.edu.cn

    Phys. Rev. C 112, 034314 – Published 12 September, 2025

    DOI: https://doi.org/10.1103/xdvj-hplt

    Abstract

    Recent high-precision (e,e′K+) experiments have observed two prominent bump structures in the Λ10Be spectrum, challenging our understanding of hypernuclear structure and hyperon-nucleon (YN) interactions. Motivated by this, we perform a systematic study of Λ10Be using a microscopic cluster model with a state-of-the-art YN interaction, guided via a control neural network (Ctrl.NN). Our calculations reveal several theoretically significant states within the energy domains of the experimental bumps. In the bump a region (≈8.5MeV), we find states corresponding to a p-wave Λ hyperon coupled to the Be9(3/21−) ground state. Their density distributions show the p-wave Λ orbit oriented parallel to the two-α cluster axis, indicating a genuine hypernuclear excitation. In the bump b region, a peculiar 0+ state is identified, featuring an s-wave Λ coupled to a contracted Be9 core (in its 1/21+ state). The density analysis confirms a distinct σ-orbit structure for the Be9 core. This work provides a detailed structural investigation of candidate states for the observed bumps and underscores the need for higher-resolution experiments to resolve these states and further refine our knowledge of YN interactions.

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