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<p>Millisecond isomers were recently observed in <sup>213,215</sup>Tl. These two isomers can be interpreted by the π0<i>h</i><sub>11/2</sub> single-proton-hole states. The 11/2<sup>−</sup> states in Tl isotopes decrease in energy when neutrons are added to the <i>v</i>0<i>g</i><sub>9/2</sub> orbital, as driven by the protonneutron monopole interaction. Based on the mechanism, this work investigates the isomerism in the southeastern vicinity of <sup>208</sup>Pb with an optimized shell-model effective Hamiltonian. The 11/2<sup>−</sup> isomeric <i>γ</i>-decay half-lives are predicted to be longer in more neutron-rich nuclei, potentially exceeding the <i>β</i>-decay half-lives. In this way, <i>β</i> decay may predominantly occur in the 11/2<sup>−</sup> states, which are crucial for understanding the <i>N</i> = 126 waiting points and the <i>A</i> = 195 peak.</p>

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Isomerism in the southeastern region of 208Pb induced by the π0h11/2 hole

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Menglan Liu,
  • Cenxi Yuan,
  • Guangxin Zhang,
  • Yinu Zhang,
  • Chong Qi

摘要

Millisecond isomers were recently observed in 213,215Tl. These two isomers can be interpreted by the π0h11/2 single-proton-hole states. The 11/2− states in Tl isotopes decrease in energy when neutrons are added to the v0g9/2 orbital, as driven by the protonneutron monopole interaction. Based on the mechanism, this work investigates the isomerism in the southeastern vicinity of 208Pb with an optimized shell-model effective Hamiltonian. The 11/2− isomeric γ-decay half-lives are predicted to be longer in more neutron-rich nuclei, potentially exceeding the β-decay half-lives. In this way, β decay may predominantly occur in the 11/2− states, which are crucial for understanding the N = 126 waiting points and the A = 195 peak.