The cumulative yields of various fission products within the mass region of 77–153 in the 3-GeV bremsstrahlung induced fission of ²³²Th have been measured by using the method of recoil catcher and an off-line γ–ray spectrometry at the Pohang accelerator laboratory, Korea. The mass yields were obtained from the cumulative yields of fission products after charge-distribution corrections in the high energy fission. We obtained the mass distribution parameters such as peak-to-valley (P/V) ratio, average light mass ($〈A_L〉$), and heavy mass ($〈A_H〉$), as well as the average post-fission number of neutrons (${〈v〉}_{expt}$) in the ²³²Th(γ,f) reactions. We compared the fission yield data in the ²³²Th(γ,f) and ²³⁸U(γ,f) reactions at various bremsstrahlung energies and the following facts were observed. (i) At the bremsstrahlung end-point energy of 2.0–3.5 GeV, the mass yield distribution in the ²³²Th(γ,f) reaction is triple humps, whereas in the²³⁸U(γ,f) reaction, it is double humps. This is due to the different type of potential energy surface between the two fissioning systems. (ii) In both the ²³²Th(γ,f) and ²³⁸U(γ,f) reactions, the yields of asymmetric products decrease marginally, whereas for those of symmetric products increase significantly with bremsstrahlung energy and thus the value of P/V ratio decrease accordingly. (iii) At all the bremsstrahlung energy, the P/V ratio of the ²³²Th(γ,f) reaction is lower than that of the ²³⁸U(γ,f) reaction due to the presence of the third peak in the mass yield distribution of former.

在浦项加速器实验室采用反冲捕集器和离线γ射线能谱法测量了3-GeV韧致辐射诱导的²³² Th裂变中77-153质量范围内各种裂变产物的累积产率， 朝鲜。质量产率是从高能裂变中电荷分布校正后裂变产物的累积产率中获得的。我们获得了质量分布参数，例如峰谷 (P / V) 比、平均轻质量 ($〈{\mathrm{一种}}_{升}〉$) 和重质量 ($〈{\mathrm{一种}}_H〉$)，以及裂变后的平均中子数 (${〈v〉}_{经验值吨}$) 在²³² Th(γ,f) 反应中。我们比较了²³² Th( γ , f ) 和²³⁸ U( γ , f ) 反应在不同韧致辐射能量下的裂变产额数据，并观察到以下事实。(i) 在韧致辐射终点能量为 2.0–3.5 GeV 时，²³² Th( γ , f ) 反应的质量产率分布为三峰，而在²³⁸ U( γ , f ) 反应中为双峰. 这是由于两个裂变系统之间的势能面类型不同。(ii) 在²³²Th( γ , f ) 和²³⁸ U( γ , f ) 反应，不对称产物的产率略有​​下降，而对称产物的产率随韧致辐射能显着增加，因此 P/V 比值相应减小。(iii) 在所有轫致辐射能下，²³² Th( γ , f ) 反应的 P/V 比低于²³⁸ U( γ , f ) 反应，因为质量产率中存在第三个峰分布前。