The dineutron as a bound chargeless nucleus of two identical nucleons has been attracting attention for many decades. In addition to the study of the formation of a bound dineutron in the outgoing channel of specific nuclear reactions, cross-section estimates have been gaining interest as research targets. We used a traditional neutron activation technique to irradiate Lu samples followed by measurements of the induced activity with HPGe spectrometer in order to detect gamma-peaks of the 175Lu (n, 2n)174gLu reaction product when this reaction channel is not open for incident neutron energies. Based on two measurements of the instrumental gamma-ray spectra of Lu samples we reliably identified the presence of the 174gLu isotope in the outgoing channel of the 175Lu (n, 2n)174gLu nuclear reaction. Also, the cross-section for this nuclear reaction was obtained and to be equal 33.5−6.7+7.0 mb. For the first time, the dineutron as a nuclearreaction product was indirectly detected via statistically significant observation of the induced activity of 174gLu with a corresponding cross-section estimate.

中文翻译：

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175Lu （n， 2n） 174 gLu 核反应中结合二子的形成及其横截面


几十年来，双子作为两个相同核子的结合无电荷原子核一直受到关注。除了研究在特定核反应的出射通道中形成束缚的二原子外，横截面估计也作为研究目标越来越受到关注。我们使用传统的中子活化技术照射 Lu 样品，然后用 HPGe 光谱仪测量诱导活性，以便在该反应通道不对入射中子能量开放时检测 175Lu （n， 2n） 174gLu 反应产物的 γ 峰。基于对 Lu 样品的仪器伽马射线光谱的两次测量，我们可靠地确定了 175Lu （n， 2n） 174gLu 核反应的出射通道中存在 174gLu 同位素。此外，还获得了该核反应的横截面，等于 33.5−6.7+7.0 mb。首次通过对 174gLu 的诱导活性进行统计学显着观察和相应的横截面估计，间接检测到 dineutron 作为核反应产物。