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基于质子反冲方法，建立了一套宽能区、高效率的中子谱仪系统。分别用三支充不同气压氢和甲烷的球形正比计数管和一个有机闪烁探测器分段测量２０ｋｅＶ～１７ＭｅＶ的中子能谱。为了去除γ射线本底，对两种探测器分别采用了两种不同的脉冲形状甄别技术。谱仪直接测量的是中子在探测器中产生的反冲质子脉冲幅度谱，通过解矩阵方程的方法得到中子谱，解谱中所用的各个探测器的中子响应矩阵均由蒙特－卡洛方法计算得到。谱仪在全能区的中子探测效率１０￣（－２）～１０￣（－１），能量分辨为５％～２０％，能谱测量的误差小于±１０％。
Based on the proton recoil method, a set of wide energy area and high efficiency neutron spectrometer system was established. The neutron spectra of 20keV ~ 17MeV were measured by three spherical proportional counter tubes with different pressures of hydrogen and methane and one organic scintillation detector respectively. In order to remove the gamma ray background, two different pulse shape discrimination techniques were used for the two detectors respectively. The direct measurement of the spectrometer is the recoil proton pulse amplitude spectrum generated by the neutron in the detector. The neutron spectrum is obtained by solving the matrix equation. The neutron response matrix of each detector used in the solution spectrum consists of a Monte- Los method calculated. The neutron detection efficiency of the spectrometer is 10 ~ (-2) ~ 10 ~ (-1) in the Almighty zone, the energy resolution is 5% ~ 20%, and the error of energy spectrum measurement is less than ± 10%.