发表机构
Technische Universität Darmstadt; iThemba Laboratory for Accelerator Based Sciences（达姆施塔特工业大学; iThemba加速器科学实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文通过准粒子-声子模型分析电子和质子散射数据，在Zr和Mo同位素中识别混合对称态，提出基于跃迁密度符号变化的新实验特征，并揭示集体性源于与巨共振的耦合。
AI 中文摘要
这是两篇系列论文中的第二篇，讨论基于质子和中子跃迁密度，在振动核 $^{92,94}$Zr 和 $^{94}$Mo 中混合对称态（MSS）的一种新的实验特征。通过将准粒子-声子模型计算与基态性质、激发态能量和矩、它们之间的跃迁概率以及 $(e,e^\prime)$ 和 $(p,p^\prime)$ 反应中的动量转移依赖性进行比较，对这些核进行了广泛检验。总体上非常好的一致性使得可以提取 MSS 及其完全对称态（FSS）的波函数信息。MSS 可以通过与 FSS 相比，主导的质子与中子双准粒子组态之间的符号变化来识别。识别出了 $2^+$、$3^-$ 和 $4^+$ MSS 的可能候选者。通过结合非弹性电子和质子散射分析得到的质子与中子跃迁密度，其符号变化为 MSS 提供了一种新的实验特征。基态激发（主要是单声子 FSS 和 MSS）的集体性在很大程度上由与具有相同自旋和宇称的高位态（形成巨共振）的耦合产生。
英文摘要
This is the second of two papers discussing a new experimental signature of mixed-symmetry states (MSS) in the vibrational nuclei $^{92,94}$Zr and $^{94}$Mo based on proton and neutron transition densities. Quasiparticle-phonon model calculations for these nuclei are extensively tested by comparison to ground-state properties, energies and moments of excited states, transition probabilities between them, and the momentum transfer dependence in $(e,e^\prime)$ and $(p,p^\prime)$ reactions. The overall very good agreement permits the extraction of information on the wave functions of the MSS and their fully symmetric (FSS) counterparts. MSS can be identified by a sign change between the leading proton and neutron two-quasiparticle configurations compared to the FSS. Possible candidates for $2^+$, $3^-$, and $4^+$ MSS are identified. The modification of proton and neutron transition densities, which can be derived from a combined analysis of inelastic electron and proton scattering, by the sign change provide a new experimental signature of MSS. The collectivity of ground-state excitations of predominantly one-phonon FSS and MSS is generated to a large extent by the coupling to high-lying states forming giant resonances with the same spin and parity.
Comments18 pages, 17 figures, submitted to Phys. Rev. C
