反转岛的边界：$^{29}$ Ne中的自由态
Border of the Island of Inversion: Unbound states in $^{29}$Ne
摘要：
核$^{29}$ Ne位于反转岛的边缘。尽管付出了巨大的努力，但还没有观察到将$^{29}$ Ne牢固地置于反转岛内的束缚的低入侵者$f_{7/2}$态。本文首次报道了$^{29}$ Ne的非束缚态。在能量约为$230$ MeV/核子的条件下，在$^{30}\mathrm{Ne}(p,pn)$和$^{30}\mathrm{Na}(p,2p)$反应中布居了这些态，并分析了它们的共振性质、部分截面和动量分布。动量分布进行比较，使用程函，直接反应模型的计算，允许$\ell$ -分配所观察到的状态。激发能为1.48（4）MeV的最低共振显示出明显的$\ell$ =3分量的迹象，首次证明了$^{29}$ Ne中存在$f_{7/2}$单粒子强度。观察到的状态的激发能和强度进行了比较，壳模型计算使用sdpf-u-mix相互作用
英文摘要：
The nucleus $^{29}$Ne is situated at the border of the island of inversion. Despite significant efforts, no bound low-lying intruder $f_{7/2}$-state, which would place $^{29}$Ne firmly inside the island of inversion, has yet been observed. Here, the first investigation of unbound states of $^{29}$Ne is reported. The states were populated in $^{30}\mathrm{Ne}(p,pn)$ and $^{30}\mathrm{Na}(p,2p)$ reactions at a beam energy of around $230$ MeV/nucleon, and analyzed in terms of their resonance properties, partial cross sections and momentum distributions. The momentum distributions are compared to calculations using the eikonal, direct reaction model, allowing $\ell$-assignments for the observed states. The lowest-lying resonance at an excitation energy of 1.48(4) MeV shows clear signs of a significant $\ell$=3-component, giving first evidence for $f_{7/2}$ single particle strength in $^{29}$Ne. The excitation energies and strengths of the observed states are compared to shell-model calculations using the sdpf-u-mix interaction
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