The signatures of inversion between normal and intruder configurations of particle-hole excitations across the $N=20$ shell gap in the neutron-rich isotope ${}^{32}\mathrm{Mg}$ have long been of keen interest. Electromagnetic transition rates in the ground-state band are key quantities that provide insights into collective properties associated with the contributions of the 2p2h and 4p4h intruder configurations. The combination of TRIPLEX, GRETINA, and the S800 spectrograph enables model-independent lifetime measurements to determine electromagnetic transition rates in rare isotopes. The reduced $E2$ transition rates in ${}^{32}\mathrm{Mg}$ between the $2_1^{+}$ and $0_1^{+}$ states and between the $4_1^{+}$ and $2_1^{+}$ states have been measured, the latter representing the first experimental $B\left(E2\right)$ value for this transition. The $B\left(E2\right)$ strengths indicate large collectivity and strong contributions from the 2p2h and 4p4h intruder configurations that may change with spin in the ground-state band of ${}^{32}\mathrm{Mg}$.

中文翻译：

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探测 Mg32 基态带中集合性的寿命测量

穿过粒子-空穴激发的正常和入侵者构型之间的反演特征 $N=20$ 富中子同位素中的壳隙 ${}^{32}镁$长期以来一直很感兴趣。基态带中的电磁跃迁率是关键数量，可以深入了解与 2p2h 和 4p4h 入侵者配置的贡献相关的集体属性。TRIPLEX、GRETINA 和 S800 光谱仪的组合可实现独立于模型的寿命测量，以确定稀有同位素的电磁跃迁率。减少的$乙2$ 转换率 ${}^{32}镁$ 在。。之间 $2_1^{+}$ 和 $0_1^{+}$ 状态和之间 $4_1^{+}$ 和 $2_1^{+}$ 状态已被测量，后者代表第一个实验 $乙\left(乙2\right)$这种转变的价值。这$乙\left(乙2\right)$ 强度表明来自 2p2h 和 4p4h 入侵者配置的大集体和强大贡献，这些配置可能随着基态带中的自旋而变化 ${}^{32}镁$.