We have studied the ${}^{26}\mathrm{Mg}(t,p){}^{28}\mathrm{Mg}$ reaction. The nucleus ${}^{28}\mathrm{Mg}$ lies between ${}^{24}\mathrm{Mg}$ and ${}^{32}\mathrm{Mg}$, the latter of which is central to the “island of inversion” characterized by low-lying neutron $fp$-shell configurations. The present results show that the second-excited $0^{+}$ state in ${}^{28}\mathrm{Mg}$ contains large $fp$-shell occupation for the neutrons. The experiment was performed in inverse kinematics using the HELIcal Orbit Spectrometer (HELIOS) at Argonne National Laboratory. Shell-model calculations using the SDPF-MU interaction yielded level energies and two-neutron transfer amplitudes that were used in one-step distorted-wave Born approximation calculations to provide theoretical predictions of the proton angular distributions. In many, but not all cases, the data were in good agreement with theoretical predictions.

中文翻译：

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在Mg28和Mg26(t,p)Mg28反应中配置混合

我们研究了 ${}^{26}镁(吨,磷){}^{28}镁$反应。细胞核${}^{28}镁$ 介于 ${}^{24}镁$ 和 ${}^{32}镁$，后者是以低位中子为特征的“反转岛”的中心 $F磷$-shell 配置。目前的结果表明，二次激发$0^{+}$ 状态在 ${}^{28}镁$ 包含大 $F磷$- 中子的壳占领。该实验使用阿贡国家实验室的 HELIcal 轨道光谱仪 (HELIOS) 在逆运动学中进行。使用 SDPF-MU 相互作用的壳模型计算产生了能级能量和两个中子转移幅度，用于一步扭曲波 Born 近似计算，以提供质子角分布的理论预测。在许多情况下，但并非所有情况下，数据与理论预测非常吻合。