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利用飞行时间法，用机械选择器测量了中国原子能科学研究院重水反应堆热柱的中子能谱．结果表明，该热柱能谱和理论Ｍａｘｗｅｌ谱有偏离．
Using the time-of-flight method, the neutron energy spectrum of the thermostated column of the China Institute of Atomic Energy was measured by a mechanical selector. The results show that the thermal energy spectrum deviates from the theoretical Maxwell spectrum.