一种测量次级中子能谱的新方法

采用双飞行时间法创建了一台非常规快中子飞行时间谱仪，排除了用D（d,n)^3He中子源测量8－13MeV能区次级中子双微分截面时源中破裂中子群对次级中子能谱测量的干扰，结合常规快中子飞行时间谱仪的测量，实现了用D（d,n)^3He中子源开展8－13MeV中子能区次级中子双微分截面的测量。     

一种测量次级中子能谱的新方法

采用双飞行时间法创建了一台非常规快中子飞行时间谱仪,排除了用D(d,n)3He中子源测量8-13MeV能区次级中子双微分截面时源中破裂中子群对次级中子能谱测量的干扰.结合常规快中子飞行时间谱仪的测量,实现了用D(d,n)3He中子源开展8-13MeV中子能区次级中子双微分截面的测量.     

中子与9Be和6,7Li反应的次级中子发射谱实验研究

测量了8.17MeV与10.27MeV中子与⁹Be和^6,7Li作用的次级中子双微分截面. 对于10.27MeV, 为了消除从D(d,np)破裂反应来的源破裂中子对双微分截面测量结果的影响, 采用了常规多探测器快中子飞行时间谱仪和非常规多探测器快中子飞行时间谱仪相结合的办法. 用Monte-Carlo方法对实验测量得到的飞行时间谱进行了详细的模拟, 通过测量谱与模拟谱的比较, 得到了实验测量的次级中子双微分截面. 实验测量结果以n-p(常规谱仪)和n-C(非常规谱仪)弹性散射微分截面作为归一. 测量结果与评价数据以及其他测量数据进行了比较. 用一个基于Hauser-Feshbach和激子模型的轻核核反应理论模型对^6,7Li的次级中子双微分截面进行了计算, 理论计算结果与实验结果符合得较好.     

Excess 3H in the volcanic lakes: evidence for natural nuclear fusion

The excess ³H (tritium) have been observed in the volcanic lakes Nemrut (Turkey), Laacher (Germany) and Pavin (France). The ⁴He and ³He concentrations in Lakes Nemrut, Laacher, and Pavin were determined to be 25 and 190, 10 and 50, and 70 and 500 times larger than the atmospheric saturation value respectively. The isotopic ratio of the helium excess, ³He_ex/⁴He_ex, in Lakes Nemrut, Laacher and Pavin was (1.032±0.006)×10^－5, (7.42±0.03)×10^－6 and (9.09±0.01)×10^－6 respectively. The ³He/⁴He ratio of helium isotopes in the lake can help us to identify the origin of gas fluxes from the interior of the Earth. The ³He/⁴He ratios in the Lakes Nemrut, Laacher and Pavin clearly indicate that a large amount of helium isotopes were released to the lakes from mantle source. The excess ³H at the bottom of Lakes Nemrut, Laacher and Pavin have a good correlation with mantle ³He. We consider that the excess ³H might be also released from mantle source and both ³H and ³He might be produced by nuclear fusion (d-d reaction) in an environment rich in H atoms and (U+Th) at high temperature and high pressure condition in deep Earth.     

低能d与6Li核反应的链式结构分子共振态的研究

测量了在共线条件下入射能量为7.3—10.6MeV的氘束引起的⁶Li(d,dd)α反应的激发曲线.在d能量为9MeV附近观察到共线增强,被认为是d-α-d链式准分子结构态的实验证据.