AI 中文总结
基于手征有效场理论，用从头算价空间介质相似重整化群方法研究rp过程等待点核的β衰变性质，导出相关算符并计算半衰期等，探讨对关联影响，未发现特定凝聚相证据，给出强度分布，提供微观图像。
AI 中文摘要
我们基于手征有效场理论中的现实核力，研究rp过程等待点核$^{72}$Kr、$^{68}$Se和$^{64}$Ge的β衰变性质。为此采用从头算价空间介质相似重整化群方法，从手征两体和三体核子相互作用中一致导出哈密顿量和伽莫夫-泰勒算符。计算的半衰期和分支比表明，几乎所有衰变强度都限制在子核激发能1 MeV范围内。我们探讨了同位旋标量和同位旋矢量对关联及其对这些等待点核基态性质的影响。结果未发现同位旋标量凝聚或任何主导的同位旋矢量对凝聚相的证据。给出了完整的B(GT)强度分布并讨论了对关联对其的影响。本工作提供了远离稳定线的N=Z核中β衰变强度和对关联的微观图像。
英文摘要
We investigate the $β$-decay properties of $rp$-process waiting-point nuclei $^{72}$Kr, $^{68}$Se, and $^{64}$Ge from realistic nuclear forces based on chiral effective field theory. The \textit{ab initio} valence-space in-medium similarity renormalization group method is employed for this purpose to consistently derive Hamiltonians and Gamow-Teller operators from chiral two- and three-nucleon interactions. The calculated half-lives and branching ratios indicate that nearly the entire decay intensity is confined within 1 MeV of excitation energy in the daughter nuclei. We address the isoscalar and isovector pairing and their impact on ground state properties of these waiting-point nuclei, along with several other $N=Z$ systems in the $fp$-shell. Our results do not provide evidence for an isoscalar condensate or any dominant isovector pairing condensate-like phase in these $N=Z$ nuclei. We present the full $B(\mathrm{GT})$ strength distributions and discuss the influence of pairing correlations on them. The present work provides a microscopic picture of $β$-decay strengths and pairing in $N=Z$ nuclei far from the stability line.
Comments10 pages, 5 figures
Journal refPhys. Rev. C 114, 014304 (2026)
