阈能在简单碰撞理论中，即指反应临界能，吸能反应(Q<0)的发生所需入射粒子的最低能量，称作该核反应的阈能，也称为核反应阈能，用符号Eth表示。
裂变阈能 threshold energy of fission ; nuclear fission threshold ; fission threshold ; fission threshold,fission threshold
脉冲阈能 pulse threshold ; pulse threshold energy
阈能中子 [核] threshold neutron
辐射阈能 radiation threshold energy
阈能探测器 threshold-energy detector
阈能反应分子法 threshold chemical reaction method
人员能力阈限原则 staff' ability limen principle
性能阈值 performance threshold
激光能量阈值 laser energy threshold
在核物理学里，求阈能一般用坐标变换的方法。
In nuclear physics, threshold energy is generally calculated by the method of coordinate transformation.
反应几率在整个能量范围之内都比较大，且没有阈能。
The calculated reaction probabilities are relatively large in the whole energy range, and have no threshold energy.
用屏蔽法检验了散射本底中子影响，高阈能探测器本底中子的影响很小。
The experimental-shielding method is used to proof-test the fraction of scattered background neutrons, and for high-threshold detectors, the influence of background neutrons is very small.
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