论文标题
两种中子转移反应是研究形状共存和量子相变之间的相互作用的工具
Two-neutron transfer reactions as a tool to study the interplay between shape coexistence and quantum phase transitions
论文作者
论文摘要
这项研究的目的是找到一个可观察的，可以区分现象，形状共存和量子相变。要分析的选定可观察到的是父母和子核中0+状态之间的两种中子转移强度。研究完成的框架是相互作用的玻色子模型（IBM），包括其配置混合（IBM-CM）的版本。为了生成我们感兴趣的同位素链的波函数，计算传递强度所需的，以前对IBM和IBM-CM进行了系统研究，而无需更改参数。使用IBM-CM提出了针对ZR，HG和PT同位素链的两种中子传输强度的结果，此外，对于ZR，PT和SM同位素链也是如此，仅使用单个配置，即无需使用配置混合而进行。在ZR的情况下，基态之间的两中子转移强度可显着可观察，表明正常和入侵者的配置在低洼频谱中共存，并且它们在A = 98-> 100的交叉处共存，这可以允许解开是否形状共存是否引起了给定的Qpt。在PT的情况下，存在形状共存，而基态的常规和入侵构型交叉几乎没有影响，而在两中性转移的值中，在HG的情况下，基态始终具有正常性质。对于是量子相跃迁范式之一的SM同位素链，两种中子转移的值受到强大的影响。
The goal of this study is to find an observable that could distinguish between both phenomena, shape coexistence and quantum phase transitions. The selected observable to be analyzed is the two-neutron transfer intensity between the 0+ states in the parent and daughter nuclei. The framework in which the study is done is the Interacting Boson Model (IBM), including its version with configuration mixing (IBM-CM). In order to generate the wave functions of the isotope chains of interest, needed for calculating transfer intensities, previous systematic studies with IBM and IBM-CM are taken without changing the parameters. Results for two-neutron transfer intensities are presented for Zr, Hg and Pt isotopic chains using IBM-CM and, moreover, the same is done for Zr, Pt and Sm isotopic chains using IBM with just a single configuration, i.e., without using configuration mixing. In the case of Zr, the two-neutron transfer intensities between the ground states provide a clear observable indicating that normal and intruder configurations coexist in the low-lying spectrum and that they cross at A=98->100, and this could allow to disentangle whether or not shape coexistence is inducing a given QPT. In the case of Pt, where shape coexistence is present and the regular and the intruder configurations cross for the ground state, there is almost no influence in the value of the two-neutron transfer, neither in the case of Hg where the ground state always has regular nature. For the Sm isotope chain that is one of the quantum phase transition paradigms, the value of the two-neutron transfer is strongly affected.
