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arXiv 0709.4155nucl-thphysics.chem-ph
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中能锕系和前锕系核的光核反应

Photonuclear reactions of actinide and pre-actinide nuclei at intermediate energies

Tapan Mukhopadhyay, D. N. Basu

摘要:

本文用准中子核光吸收模型描述了光核反应,并讨论了轻粒子蒸发和裂变对激发核的竞争过程。因此,裂变过程被认为是一种衰变方式。在Monte-Carlo框架下模拟了复合核的蒸发-裂变过程。本文系统地分析了锕系元素$^{232}$ Th,$^{233}$ U,$^{235}$ U,$^{238}$ U和$^{237}$ Np以及前锕系元素$^{208}$ Pb和$^{209}$ Bi在$\sim$ ~50-70 MeV能量范围内的光裂变反应截面。本文较好地再现了能区$\sim$ ~50-70 MeV光裂变截面的实验数据,以及中能区[ $\sim$ ~20-140 MeV]锕系和前锕系核裂变随裂变参数$Z^2/A$的增加趋势。

英文摘要:

Photonuclear reaction is described with an approach based on the quasideuteron nuclear photoabsorption model followed by the process of competition between light particle evaporation and fission for the excited nucleus. Thus fission process is considered as a decay mode. The evaporation-fission process of the compound nucleus is simulated in a Monte-Carlo framework. Photofission reaction cross sections are analysed in a systematic manner in the energy range $\sim$~50-70 MeV for the actinides $^{232}$Th, $^{233}$U, $^{235}$U, $^{238}$U and $^{237}$Np and the pre-actinide nuclei $^{208}$Pb and $^{209}$Bi. The study reproduces satisfactorily well the available experimental data of photofission cross sections at energies $\sim$~50-70 MeV and the increasing trend of nuclear fissility with the fissility parameter $Z^2/A$ for the actinides and pre-actinides at intermediate energies [$\sim$~20-140 MeV].

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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