共查询到7条相似文献,搜索用时 46 毫秒
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《原子能科学技术》2019,(10)
利用背角准弹散射的方法开展了近库仑势垒(近垒)能区重离子核反应机制的研究。高精度测量了深垒下能区~(16)O+~(152,154)Sm、~(184)W、~(196)Pt和~(208)Pb等体系的背角准弹散射激发函数,用耦合道计算抽取了核势的表面弥散参数,结果表明考虑耦合道效应得到的表面弥散参数值正常。基于背角准弹散射势垒分布对核结构的敏感性,尝试用深垒下能区~(16)O+~(152)Sm、~(170)Er和~(174)Yb等体系的背角准弹散射来抽取形变靶核的十六极形变参数,所抽取值与已有结果趋势一致,说明了该方法的可行性。此外,研究了弱束缚核体系的破裂效应,其表现为背角准弹势垒分布较全熔合势垒分布向低能移动,所得结果进一步说明势垒分布同时含有核结构和核反应机制的信息。 相似文献
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《中国原子能科学研究院年报》2018,(0)
正Nowadays the reaction mechanism study of weakly bound nuclei has been one of the frontier problems of nuclear physics.For weakly bound nucleus,the nuclear force and Coulomb force is so weak that in the process of interaction with target nucleus,weakly bound nucleus may break- 相似文献
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《Journal of Nuclear Science and Technology》2013,50(10):407-421
Using a time-of-flight spectrometer, the differential cross sections were measured for the elastic and inelastic scattering of 14.1 MeV neutrons by 6Li, 7Li, 9Be, 10B and 11B. In the case of elastic scattering by 7Li and 10B, correction was applied to subtract the contribution of inelastic scattering from the unresolved first excited state, after which, the elastic scattering data were compared with predictions based on the optical model. The potential parameters derived with a seven-parameter search yielded angular distributions agreeing with the present experimental data. The expressions for these parameters are presented as a function of mass number. The experimental data on inelastic scattering were analyzed with the distorted wave Born approximation. The deformation parameters were estimated to be nearly equal to or larger than unity for these nuclei. 相似文献
4.
《Journal of Nuclear Science and Technology》2013,50(12):523-534
Energy spectra of neutrons scattered inelastically from natural samples of Ta, W, Au, Hg, TI, Pb and Bi have been studied at an incident energy of 14MeV, using time-of-flight technique. Angular distributions were also measured for Ta and Bi. The energy spectra from 2MeV to 4MeV were found to be qualitatively consistent with the prediction from statistical theory taking account of effects of nuclear pairing and shell structure. The Fermi gas level density parameter and the nuclear temperature were obtained by considering the contribution of the (n,2n) reaction. The variation of level density parameter plotted against mass number was found to agree with the trend predicted theoretically by Newton. Angular distributions proved to be symmetric about 90° and the spin cut-off parameter was estimated to be about 5.8 for Ta and 4.3 for Bi. Cross sections for the (n,n′2n) and (n,2n) reactions were obtained. 相似文献
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中子皮是原子核的关键物理参数之一,对非对称核物质状态方程有重要的约束作用。本工作主要利用12C+96Zr弹性散射角分布研究96Zr的中子皮,首先采用Woods-Saxon势,通过改变实部势参数得到与实验数据拟合最优的1组光学势参数,然后利用双折叠势模型(DFM)计算96Zr在不同中子密度分布下与12C的相互作用势,通过比较两组相互作用势,找出与最佳光学势对应的96Zr核的中子分布均方根半径,从而得到96Zr的中子皮厚度为0.087 fm,此结果与其他研究结果在误差范围内符合很好。 相似文献