Abstract

The \({}^{1}S_{0}\) neutron–neutron (\(nn\)) scattering length was measured in the neutron–deuteron (\(nd\)) breakup reaction at an energy of 60 MeV. The respective experiment was performed in the geometry of final-state interaction via detecting all three secondary particles. The scattering-length value of \(a_{nn}={-}16.3\pm 0.5\) fm was determined on the basis of a comparison of the experimental dependence of the \(nd\)-breakup reaction yield on the relative energy of the \(nn\) pair with the results of a simulation. An analysis of this scattering-length value, together with data obtained in other experiments devoted to studying \(nd\) and \(dd\) breakup, confirms the hypothesis that three-nucleon forces affect the values extracted from data on these reactions for the parameters of the \(nn\) interaction.

中文翻译：

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从$$ \ boldsymbol {E_ {n} = 60} $$的反应$$ \ boldsymbol {n + ^ {2} \ textrm {H} \到n + n + p} $$的中子-中子散射长度数据病毒

摘要

的\（{} ^ {1} S_ {0} \）中子的中子（\（NN \） ）散射长度是在中子氘核测量（\（ND \） ），在60兆电子伏的能量破裂反应。通过检测所有三个次级粒子，在最终状态相互作用的几何形状中进行了相应的实验。\（a_ {nn} = {-} 16.3 \ pm 0.5 \） fm的散射长度值是根据\（nd \）-分解反应产率对相对能量的实验依赖性比较确定的的\（NN \）与模拟的结果对。对该散射长度值的分析，以及在其他研究\（nd \）和\（dd \）分解证实了以下假设：三核子力会影响从这些反应的数据中提取的关于（nn \）相互作用参数的值。