中能区钽和分离钨同位素的核诱导fission截面和“复合核”效应
Nucleon-induced fission cross-sections of tantalum and separated tungsten isotopes and "compound nucleus" effect in intermediate energy region
摘要：
钨分离同位素的中子和质子诱发裂变截面在入射核子能区50 - 200 MeV，用薄膜击穿计数器（TFBC）裂变室，用7 Li（p，n）反应和在乌普萨拉大学（Uppsala，Sweden）Svedberg实验室（TSL）的质子束处。结果进行了比较与预测的CEM03.01事件发生器，以及与最近的数据在铅铋区域的核。本文讨论了中能区的“复合核”效应，它表现在核子感生裂变截面与复合系统（射弹+靶核）的参数Z^2/A的指数关系，以及在裂变过程的其它特性中，参数Z^2/A所起的作用类似于复合核通常的液滴参数Z^2/A。
英文摘要：
Neutron- and proton-induced fission cross-sections of separated isotopes of tungsten (182W, 183W, 184W, and 186W) and 181Ta relative to 209Bi have been measured in the incident nucleon energy region 50 - 200 MeV using fission chambers based on thin-film breakdown counters (TFBC) using quasi-monoenergetic neutrons from the 7Li(p,n) reaction and at the proton beams of The Svedberg Laboratory (TSL), Uppsala University (Uppsala, Sweden). The results are compared with predictions by the CEM03.01 event generator, as well as with the recent data for nuclei in the lead-bismuth region. The effect of "compound nucleus" in the intermediate energy region is discussed, displaying in exponential dependence of nucleon-induced fission cross-sections on the parameter Z^2/A of the composite system (projectile+target nucleus), and in other characteristics of the fission process for which parameter Z^2/A plays a role similar to the one of the usual liquid-drop parameter Z^2/A of compound nuclei.
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