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问题的提出首次实现的人为核反应是:_7~(14)N+_2~4He→(_9~(18)F)→_8~(17)O+_1~1H。(为吸能反应)设靶核_7~(14)N 静止,问入射粒子_2~4He 至少具有多大动能,才能使反应实现?这实际上是一个求阈能的问题。使吸能核反应实现所需入射粒子的最小动能,称为阈能。在核物理学中,求阈能最方便的办法是,利用质心坐标系将结果转换到实验室坐标系。这自然超出了中学物理
The first proposed artificial nuclear response is: _7~(14)N+_2~4He→(_9~(18)F)→_8~(17)O+_1~1H. (For energy-absorption reactions) Let the target nucleus _7~(14)N be stationary and ask the incident particles _2~4He to have at least a lot of kinetic energy in order to make the reaction to be realized. This is actually a problem of seeking the threshold energy. The minimum kinetic energy required to make the energy-absorbing nuclear reaction to achieve the desired incident particles is called the threshold energy. In nuclear physics, the most convenient way to find the threshold energy is to use a centroid coordinate system to convert the result to the laboratory coordinate system. This naturally goes beyond middle school physics