通过$^{150}$Nd$(p,t){}^{148}$Nd反应研究$^{148}$Nd的激发态及N=88处可能的低自旋双声子八极态的观测
Excited states of $^{148}$Nd studied via the $^{150}$Nd$(p,t){}^{148}$Nd reaction and the observation of possible low-spin two-phonon octupole states at $N=88$
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中文总结 AI 辅助
本研究通过$^{150}$Nd$(p,t){}^{148}$Nd实验观测$^{148}$Nd的54个激发态，提出$0^+_3$带为N=88处双声子八极态候选，结合IBM-1计算分析相关可观测物理量，还探讨了利用$B(E1)/B(E2)$比值交错探测多八极声子带的方法。
中文摘要 AI 辅助
我们报告了在美国佛罗里达州立大学John D. Fox加速器实验室开展的$^{150}$Nd$(p,t){}^{148}$Nd实验的新数据，共观测到$^{148}$Nd的54个激发态，激发能最高达3500 keV。本研究聚焦于$0^+$态及其带成员，与此前研究不同，提出$0^+_3$带为双声子八极振动带的候选，并给出支持的$spdf$ IBM-1计算；为验证IBM计算的稳健性，本文对多个可观测物理量进行了探究与讨论。此外，我们认为其他N=88同中子异核素的$0^+_2$和$0^+_3$态均不太可能是双声子八极态的合适候选，基于$^{148}$Nd的新数据，我们提出$^{150}$Sm和$^{152}$Gd中存在候选态；利用旋称序列中等自旋态的现有γ衰变数据并与IBM计算对比，我们还展示了旋称序列中$B(E1)/B(E2)$比值的交错现象可用于探测多八极声子带的出现。
英文摘要
We report new data from a $^{150}$Nd$(p,t){}^{148}$Nd experiment performed at the John D. Fox Accelerator Laboratory of Florida State University. In total, 54 excited states of $^{148}$Nd were observed up to an excitation energy of 3500 keV. In this work, we focus on $0^+$ states and their band members. In contrast to previous work, the $0^+_3$ band is proposed as the candidate for the two-phonon octupole vibrational band. Supporting $spdf$ IBM-1 calculations are presented. To test the robustness of the IBM calculations, several observables were interrogated and are discussed in this publication. In addition, we make the case that neither the $0^+_2$ nor the $0^+_3$ states of the other $N=88$ isotones are likely good candidates for two-phonon octupole states. Based on our new data for $^{148}$Nd, we propose candidates in $^{150}$Sm and $^{152}$Gd. Using available $γ$-decay data for states with moderate spins in the yrast sequence and a comparison to IBM calculations, we also show how the staggering of the $B(E1)/B(E2)$ ratios in the yrast sequence can possibly be used to probe the appearance of bands with multiple octupole phonons.
