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Post-Neutron Mass Yield Distribution in the Thermal Neutron Induced Fission of 232U
Nuclear Science and Engineering ( IF 1.2 ) Pub Date : 2021-11-23 , DOI: 10.1080/00295639.2021.1993425
H. Naik 1 , R. J. Singh 1 , W. Jang 2 , S. P. Dange 1
Affiliation  

Abstract

In the thermal neutron–induced fission of 232U, cumulative and independent yields of various fission products within the mass ranges of 72 to 107 and 123 to 158 have been measured using an off-line gamma-ray spectrometric technique. The fission yields were determined relative to the yield of a monitor product 92Sr. Charge distribution correction was applied on the cumulative yields to obtain the post-neutron mass yield distribution. Mass yield distribution parameters such as full-width at tenth-maximum of light and heavy mass wings, average light mass number <AL> and heavy mass number <AH>, and average number of emitted neutrons <ν> were obtained. Data from the present and earlier work on the 232U(nth,f) reaction were compared with similar data of the 235U(nth,f) reaction. It was found that the mass chain yield distribution in the 232U(nth,f) reaction is asymmetric with two major humps as in the case of the 235U(nth,f) reaction. Besides this, in the 232U(nth,f) reaction, the mass yield distribution shows a small third hump for the symmetric fission products. It was also found that the standard II asymmetric mode of fission is favorable in the 232U(nth,f) reaction whereas the standard I asymmetric mode of fission is favorable in the 235U(nth,f) reaction.



中文翻译:

232U热中子诱发裂变中的后中子质量产率分布

摘要

232 U 的热中子诱发裂变中,使用离线伽马射线光谱技术测量了 72 到 107 和 123 到 158 质量范围内各种裂变产物的累积和独立当量。裂变产率是相对于监测产品92 Sr 的产率确定的。电荷分布校正应用于累积产率以获得中子后质量产率分布。得到了轻、重质量翼的第十大全宽、平均轻质量数<A L >和重质量数<A H >、平均发射中子数<ν>等质量当量分布参数。232 U(n ) 现在和早期工作的数据th ,f) 反应与235 U(n th ,f) 反应的类似数据进行了比较。发现232 U(n th ,f) 反应中的质量链产率分布与235 U(n th ,f) 反应的情况一样,具有两个主要的驼峰不对称。除此之外,在232 U(n th ,f) 反应中,质量产率分布显示出对称裂变产物的小第三峰。还发现标准 II 不对称裂变模式有利于232 U(n th ,f) 反应,而标准 I 不对称裂变模式有利于235U(n th ,f) 反应。

更新日期:2021-11-23
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