论文标题
研究$λnn$绑定状态和共鸣
Study on $Λnn$ Bound State and Resonance
论文作者
论文摘要
我们执行Ab Initi算无核壳模型（NCSM）计算，以研究手性的三体$λNN$系统的界面问题近代到领导级nn和手性的前阶YN相互作用。计算表明，没有$λnn$绑定状态，但预测阈值接近阈值的低洼$λnn$谐振状态，$ e_r = 0.124 $ meV，宽度约为$γ= 1.161 $ MEV。在搜索$λnn$共振时，我们通过在散射理论中采用J-Matrix形式主义，将NCSM计算扩展到连续性状态。
We perform the ab initio no-core shell model (NCSM) calculation to investigate the bound state problem of the three-body $Λnn$ system in chiral next-to-next-to-leading-order NN and chiral leading-order YN interactions. The calculations show that no $Λnn$ bound state exists, but predict a low-lying $Λnn$ resonant state near the threshold with the energy of $E_r= 0.124$ MeV and the width of about $Γ=1.161$ MeV. In searching for $Λnn$ resonances, we extend the NCSM calculation to the continuum state by employing the J-matrix formalism in the scattering theory with the hyperspherical oscillator basis.
