中子引起氘核破裂反应的实验研究
Experimental Study of Neutron Induced Deuteron Breakup Reactions
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摘要: 对25 MeV中子引起氘核破裂反应的中子中子准自由散射和17.36 MeV中子引起氘核破裂反应的中子-中子末态相互作用进行了细致的研究。 首先， 以小于5%的不确定度， 精确测量了25 MeV中子中子准自由散射出射的中子三重微分截面。 实验数据用基于现实核子核子势(CD Bonn，Argonne ??18，Nijm I和II)的理论计算配合MonteCarlo模拟进行了分析。 实验结果比基于CDBonn势的理论预言高(16.0±4.6)%， 进一步证实了目前的理论在中子-中子准自由散射方面还无法准确描述实验数据。 其次， 通过运动学非完全测量， 精确测量了17.36 MeV中子引起氘核破裂反应在0°角附近出射的质子能谱， 用基于现实核子核子势(CDBonn、 BonnB和Nijm I)的理论计算以及MonteCarlo模拟分析了所测得的质子能谱， 确定了中子-中子散射长度ann=（-16.8±0.6） fm。 The neutronneutron (nn) quasifree scattering (QFS) at 25.0 MeV and nn final state interaction (FSI) at 17.4 MeV in the nd breakup reaction were studied in this work. First， the absolute breakup cross section was measured with an accuracy of <5 % in the nn QFS. The measured data was analyzed by MonteCarlo simulation based on modern realistic NN potentials (CDBonn， Argonne ??18， Nijm I and II). The measured data exceeds the theoretical prediction based on CDBonn by (16.0±4.6%). Second， the proton emission spectrum around 0° was measured in the nd breakup reaction at 17.4 MeV with kinematical incomplete setup. The data was analyzed by MonteCarlo simulation based on CDBonn. The nn scattering length determined in this work was ann=（-16.8±0.6） fm.Abstract: The neutronneutron (nn) quasifree scattering (QFS) at 25.0 MeV and nn final state interaction (FSI) at 17.4 MeV in the nd breakup reaction were studied in this work. First， the absolute breakup cross section was measured with an accuracy of <5 % in the nn QFS. The measured data was analyzed by MonteCarlo simulation based on modern realistic NN potentials (CDBonn， Argonne ??18， Nijm I and II). The measured data exceeds the theoretical prediction based on CDBonn by (16.0±4.6%). Second， the proton emission spectrum around 0° was measured in the nd breakup reaction at 17.4 MeV with kinematical incomplete setup. The data was analyzed by MonteCarlo simulation based on CDBonn. The nn scattering length determined in this work was a nn=（-16.8±0.6） fm.
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