论文标题
$^{26} $ O的连续频谱中的中子对结构
Neutron-pair structure in the continuum spectrum of $^{26}$O
论文作者
论文摘要
$^{26} $ O的结构目前正在理论和实验方面进行调查。众所周知，它是未结合的，共振参数是相当众所周知的。理论分析可能涉及两体和三体相互作用，以及与能量连续谱的相关性。为了正确评估地面和激发态的结构，必须包括具有正确渐近行为的大型单个粒子表示。这项工作的目的是提供地面的单个粒子连续配置的详细信息，并激发$ 0^+$状态。我们使用由共振和复杂能量散射状态（所谓的伯格格伦基础）和可分离的相互作用形成的大型复杂能量单个粒子基础，在大型模型空间中很方便。在复杂的能量平面中发现了三个$ 0^+$状态。分析了谐振参数的变化，即能量和宽度，是残余相互作用强度的函数。它显示了相互作用的微妙差异如何将$^{26} $ O的未结合特征变成硼核。两个激动的状态中只有一个可以被视为具有物理有意义共鸣的候选者。计算出的职业概率与其他理论方法一致，尽管计算出的一半Live的数量级要比实验小的三个级级。
The structure of $^{26}$O is currently being investigated on both theoretical and experimental fronts. It is well established that it is unbound and the resonance parameters are fairly well-known. The theoretical analysis may involved two- and three-body interactions, as well as correlations with the continuum spectrum of energy. In order to properly assess the structure of the ground and excited states, it is imperative to include a large single particle representation with the right asymptotic behavior. The purpose of this work is to provide details of the single particle continuum configurations of the ground and excited $0^+$ states. We use a large complex energy single particle basis, formed by resonances and complex energy scattering states, the so called Berggren basis, and a separable interaction, which is convenient to solve in a large model space. Three $0^+$ states were found in the complex energy plane. Changes of the resonant parameters, i.e. energy and width, were analyzed as a function of strength of the residual interaction. It is shown how a subtle difference in the interaction could change the unbound character of $^{26}$O into a Borromean nucleus. Only one of the two excited states can be considered as a candidate for a physical meaningful resonance. The calculated occupation probabilities are in agreement with other theoretical approaches although the calculated half live is three-order of magnitude smaller than the experimental one.
