共查询到17条相似文献,搜索用时 46 毫秒
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系统总结了研究近垒和垒下重离子熔合裂变反应碎片各向异性的异常的结果 ,提出一个新的预平衡裂变模型,成功地解释了碎片各向异性的异常现象 .但对异常宽峰结构不能说明 ,有待进一步研究. Systematic summary on the anomalous anisotropies of fission fragments in near and sub barrier fusion fission reactions is presented. A new version of the preequilibrium fission model is put forward to explain the anomalous anisotropies of fission fragments, except the bump of anomaly. Further study is still needed. 相似文献
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通过分析和计算锕系核裂变截面和全套中子反应截面获取了一组锕系核的裂变位垒参数.Fm)在此基础上,广泛收集实验裂变位垒参数,通过比对和评价,推荐了本组的129个核素(109Cd—255的实验裂变位垒参数.此外,对收集的不同裂变位垒参数作了分析与评价,推荐了7组实验和1组模型计算的裂变位垒参数,并组建了中国评价核参数库裂变位垒参数子库(CENPL FBPL). The fission barrier parameters for actinide nuclei were obtained by analysis and calculations of fission cross-sections and complete neutron reaction cross sections. A lot of experimental fission barrier parameters from different authors were collected. A set of fission barrier parameters for 129 nuclei ranging from~(109)Cd~( ) to~(255)Fm were recommended after performing comparisons, evaluations and systematics extrapolations for these extracted fission barrier parameters in model calculations of fissi... 相似文献
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使用两块大面积平行板雪崩计数器,测量了近垒及垒下28Si+174Yb熔合裂变碎片质量-角度关联分布及质量分布。质量-角度二维图显示在该反应能量区间内并没有发现明显的准裂变成分。运用单高斯曲线拟合了裂变碎片的质量分布并抽取了质量宽度。结果表明:在库仑势垒以上,质量宽度随着反应能量的升高而增大;在库仑势垒以下能区,发现质量宽度随着反应能量的降低而呈现轻微增大的趋势。运用鞍点统计模型对本次实验数据拟合发现,需用比文献给出的更大的刚度系数才能重现实验结果,其物理原因还需要进一步研究。In order to study the fission mechanism, the mass distributions and mass-angle distributions of the fission fragments for 28Si+174Yb were measured near the Coulomb barrier. The mass-angle correlations do not indicate any possible quasi-fission events in this bombarding energy range. The mass distributions were fitted by the single Gaussian distribution and then the mass widths were extracted. At above-barrier energies, the mass widths were found to increase with the energy. However, the mass widths show slight increase with decreasing energy below the barrier. Additionally, the mass widths can not be reproduced in the framework of the saddle statistic model with the given parameter, so further study is still needed. 相似文献
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一、裂变反应的发现及其意义1932年查德威克发现了中子,使人类终于找到一把打开核反应大门的钥匙。由于中子和原子核之间没有库仑排斥力,可以很容易进入核内而产生各种类型的核反应过程,例如弹性散射、非弹性散射、粒子转移反应、敲出反应、俘获辐射反应等。 相似文献
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铀发生裂变会产生许多种不稳定的丰中子核.芬兰Jyvaskyla大学的一个研究小组对质子引起的铀裂变产生的一些同位素,包括锶、锆和钼,进行了高精度的质量测量. 相似文献
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Kurt N. Clausen 《Pramana》2008,71(4):623-628
In this paper the most promising technology for high power neutron sources is briefly discussed. The conclusion is that the
route to high power neutron sources in the foreseeable future is spallation — short or long pulse or even CW — all of these
sources will have areas in which they excel.
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Krzysztof Pomorski José M. Blanco Pavel V. Kostryukov Artur Dobrowolski Bo?ena Nerlo-Pomorska Micha? Warda Zhi-Gang Xiao Yong-Jing Chen Li-Le Liu Jun-Long Tian Xin-Yue Diao Qiang-Hua Wu 《中国物理C(英文版)》2021,45(5):054109-054109-11
Fission properties of the actinide nuclei are deduced from theoretical analysis. We investigate potential energy surfaces and fission barriers and predict the fission fragment mass yields of actinide isotopes. The results are compared with experimental data where available. The calculations were performed in the macroscopic-microscopic approximation with the Lublin-Strasbourg Drop (LSD) for the macroscopic part, and the microscopic energy corrections were evaluated in the Yukawa-folded potential. The Fourier nuclear shape parametrization is used to describe the nuclear shape, including the non-axial degree of freedom. The fission fragment mass yields of the nuclei considered are evaluated within a 3D collective model using the Born-Oppenheimer approximation. 相似文献
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用统计模型分析级联裂变,假设复合核首先分裂为两裂变碎片,其质量分布与实验分布一致,跟踪所有质量上可能的裂变碎片和所有能量上可能的衰变过程,统计裂变碎片再次裂变的几率,证明级联裂变模式基本上与三分裂的实验相符,复合核系统的激发能越高,裂片的质量越大,再裂的几率也就越大. 相似文献
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研究了描述原子核裂变过程的Langevin方程和Fokker-Planck方程的协变性,给出了动力学参数的坐标交换规律. 相似文献