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Signatures of few-body resonances in finite volume

机译:有限体积中几体共振的签名

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摘要

We study systems of bosons and fermions in finite periodic boxes and show how the existence and properties of few-body resonances can be extracted from studying the volume dependence of the calculated energy spectra. We use and briefly review a plane-wave-based discrete variable representation, which allows a convenient implementation of periodic boundary conditions. With these calculations we establish that avoided level crossings occur in the spectra of up to four particles and can be linked to the existence of multibody resonances. To benchmark our method we use two-body calculations, where resonance properties can be determined with other methods, as well as a three-boson model interaction known to generate a three-boson resonance state. Finding good agreement for these cases, we then predict three-body and four-body resonances for models using a shifted Gaussian potential. Our results establish few-body finite-volume calculations as a new tool to study few-body resonances. In particular, the approach can be used to study few-neutron systems, where such states have been conjectured to exist.
机译:我们在有限的周期盒中研究玻源和阴离子的系统,并展示如何提取几体共振的存在性和性质从研究计算的能谱的体积依赖性。我们使用并简要介绍基于平面波的离散变量表示,这允许方便地实现周期性边界条件。通过这些计算,我们建立了避免的水平交叉,在最多四个颗粒的光谱中发生并且可以与多体共振的存在相关联。基准测试我们的方法,我们使用双体计算,其中可以用其他方法确定谐振特性,以及已知的三个玻色子模型相互作用以产生三玻色子共振状态。找到对这些案例的良好一致性,然后我们使用移位的高斯潜力预测用于模型的三体和四体共振。我们的结果建立了几体有限卷计算作为研究几体共振的新工具。特别地,该方法可用于研究几个中子系统,其中猜测这些状态存在。

著录项

  • 来源
    《Physical review, C》 |2018年第3期|共12页
  • 作者单位

    Tech Univ Darmstadt Inst Kemphys D-64289 Darmstadt Germany;

    Tech Univ Darmstadt Inst Kemphys D-64289 Darmstadt Germany;

    Tech Univ Darmstadt Inst Kemphys D-64289 Darmstadt Germany;

    Tech Univ Darmstadt Inst Kemphys D-64289 Darmstadt Germany;

    Tech Univ Darmstadt Inst Kemphys D-64289 Darmstadt Germany;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
  • 关键词

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