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ANGULAR DISTRIBUTIONS OF FISSION FRAGMENTS IN INTERACTIONS OF 12C IONS WITH VARIOUS TARGETS 下载免费PDF全文
Angular distributions of fission fragments were measured for a series of compound nuclei formed in the bombardment of 169Tm,175Lu,181Ta,W,Re,Pt,197Au,Pb and 209Bi by 12C ions with mica track detectors and gold surface barrier silicon detectors.All the measured angular distributions can be fitted satisfactorily by the theoretical formula based on saddle point model.The variation trend for K2 with the excitation energy increasing was given at various ranges of the fission parameter Z2/A. 相似文献
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LIU Guo-Xing 《中国物理C(英文版)》1987,11(1):98-103
The angular distributions of fission fragments are measured for systems of 120MeV 14N+118Sn with mica track detectors and gold-surfacebarrier silicon detectors. The measured angular distributions can be fitted by the standard theory of fission angular distributions on the basis of statistical model. The effective moments of inertia of fissioning nuclei at saddle point are derived from angular distribution anisotropies. The shapes of saddle point of fissioning nuclei in the region of Z2/A<30 are discussed. 相似文献
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The effective moment of inertia,charge density distributions of the fissioning nucleus 170Yb and 254Fm at saddle point are calculated by using the continuous medium model with variable densities. 相似文献
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A shape, rotating cassin's oval body with symmetry deformation parameter of 1.0, in nuclear fission scission point is suggested. By use of the shape, simple calculations on average total kinetic energy of fission fragments in both symmetry and asymmetry cases show that the results are in agreement with semiempirical formula due to V.E. Viola. 相似文献
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用模型势方法对正电子与氪、氙原子散射角分布进行了系统计算,通过对算得的微分截面(散射角从20°-160°)的数据分析,结合作者以前对正电子与氦、氖、氩原子散射角分布的研究结论,总结出了低能正电子与稀有气体原子散射角分布规律 相似文献
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The fission cross sections and the evaporation residue cross sections for 12C+209Bi and 14N+Pb reactions were measured with the gold surface barrier silicon detectors and the mica nuclear track detectors.The critical angular momentum ler was deduced from the measured evaporation residue cross section σer on the basis of the sharp-off model.The fission barrier with the particular angular momentum i derived from the condition Γf/Γn=1 at l=le The angular momentum effect of the fission barrier was studied experimentally. 相似文献
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ZHENG Chun-Kai 《中国物理C(英文版)》1990,14(8):753-761
A simple calculation method for charge for charge density distributions of deformed nuclei by using macroscopic model has been proposed.The calculations of charge density distributions for 192Os,154Gd,152Sm,174Yb, and 144,148,150,152Sm nuclei have been performed.The results show that the calculated charge densities are in good agreement with experiments.Consequently,on the base of experimental data of the transition probabilities for ground state to 2+,4+,6+ rotational states or its electric multipole moments,The charge density distributions of deformed nuclei can be predicted theoretically by this method. 相似文献
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The problem of the nuclear fission rate is studied from the point of view of Brownian motion. The Fokker-Plank equation is solved by means of the rate ei-genvalue method. The viscosity tensors, the inertia coefficients and the temperature are functions of nuclear deformation. Their effects on the fission rate are also stu-died. 相似文献
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The role of the non-diagonal difusion coefficient D12 of the two dimensional F-P EQ. In the mean value of angular momentum of fragments, their varaince and covaraince are discussed. It is found that D12 doesnot influence the equilibrium value of the quantities, but influences the rate for the quantities to reach equilibrium. So that it mainly influences the angular momentum transfer at the beginning of the reaction and that of large incident angular momentum partial waves. We also find that the covaraince is especially sensitive to D12. 相似文献
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LIU Guo-Xing CHEN Ke-Liang ZHENG Ji-Wen WANG Su-Fang BAI Xing-Ping YU Xian FAN Zhi-Guo 《中国物理C(英文版)》1989,13(8):733-739
The angular distributions of fission fragments for a series of compound nuclei formed in the bombardment of 181Ta,197Au Pb and 209Bi by 12C ions and in the bombardment of natural lead by 14N ions were measu ed with mica track detectors and gold surface barrier detectors.It is shown that all experimental data for the fission fragment angular distributions can be fitted by the statistical scission model of fission fragment angular distribution. 相似文献
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电子束参量对轫致辐射照射量角分布的影响 总被引:2,自引:1,他引:1
本文研究了电子束半径,发射度及能量等参量对闪光X射线照射量在1m处角分布的影响。求得了使中心照射量最大,束半径与发射度之间应满足的拟合关系,表明了电子束能量越高,发射度越小,那么中心照射量就越大,照射量的空间分布就越理想。对电子细束入射位置和入射方向使用了解析法和随机抽样法求出,两种方法的数值计算所得的照射量分布符合得比较好。 相似文献
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CHANG HSI-CHEN 《中国物理C(英文版)》1977,1(1):79-82
A Woods-Saxon potential is used to study particle emission.The angular momenta limitation with respect to particle emission is calculated for nuclei with A between 70 and 160 and for four types of deformation.The competition between fission and particle emission is discussed.It is shown that a highly spinning nucleus may first undergo particle emission. 相似文献
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