论文标题
部分可观测时空混沌系统的无模型预测
Excited states of zero seniority based on a pair condensate
论文作者
论文摘要
我们研究了通过配对力和一般两体相互作用相互作用的各种类似粒子系统的零资历的激发态。我们考虑了两种类型的激发，这些激发是从一对凝结物描述的基态产生的。一种类型是通过从基态冷凝物中分解一对，并通过建立在时间倒转的单粒子轨道上的“激发”集体对代替它。第二种零资历激发态通过相同激发对的冷凝物描述。分析了这些激发态的结构，分析了挑选的围栏模型和$^{108} $ sn的价中子。对于持续的配对交互，第一种激发状态与j = 0状态非常吻合，$^{108} $ sn中已知的状态。同时，这些状态也可以与那些与实验水平最接近的精确状态明确关联。对应于激发对的凝结物的状态在低能，围绕第一种类型的第二激发态的能量出现，并且它们与精确的特征状态没有简单的对应关系。但是，在更高的激发能量下，确切的状态与EPC状态相似。结果表明，该EPC状态具有巨型配对振动的特征。
We study the excited states of zero seniority for various like-particle systems interacting by pairing forces and by general two-body interactions. We consider two types of excitations, generated from a ground state described by a pair condensate. One type is obtained by breaking a pair from the ground state condensate and replacing it by "excited" collective pairs built on time-reversed single-particle orbits. The second type of zero seniority excited states is described by a condensate of identical excited pairs. The structure of these excited states is analysed for the picked fence model and for the valence neutrons of $^{108}$Sn. For a state-depending pairing interaction, the first type of excited states agree well with the J=0 states which are known in $^{108}$Sn. At the same time, these states can be also associated unambiguously with those exact states which are the closest in energy to the experimental levels. The states corresponding to the excited pair condensate appear at low energies, around the energy of the second excited state of the first type, and they do not have a simple correspondence with exact eigenstates. However, at a much higher excitation energy there is an exact state which is similar in structure to an EPC state. It is shown that this EPC state has the features of a giant pairing vibration.
