共查询到20条相似文献,搜索用时 46 毫秒
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We investigate the effects of target deformation on the synthesis of superheavy nucleus 283^112 in the framework of the extra-push model. Our results show that the cross sections of the 3n evaporation residue in the 48^Ca 238^U reaction for the case of β2=0.275 are several times larger than those of β2=0. Meanwhile, the peak position of ER excitation function in the case of the deformed target is shifted to lower energy as compared to that of the spherical target. 相似文献
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The properties of the a decay nuclei of^310 126, ^292 120 and ^298 114 are investigated in the deformed relativistic meanfield model. The nuclear properties are investigated with the TMA and NL-Z2 parameter sets, and compared with Moller‘s result [At. Data Nucl. Data Tables 59 (1995) 185]. The results show that the a decay energy increases systematically with the increasing proton number. Meanwhile, the a decay energy has a minimum value at the point of shell closure. It is also found that among the three nuclei, ^292 120 is more possible to be the next doubly magic nucleus. 相似文献
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GUOWen-Jun JIANGHuan-Qing LIUJian-Ye ZUOWei RENZhong-Zhou LEEXi-Guo 《理论物理通讯》2003,40(5):577-584
We develop a method for calculation of the total reaction cross sections induced by the halo nuclei and stable nuclei. This approach is based on the Glauber theory, which is valid for nuclear reactions at high energies. It is extended for nuclear reactions at low energies and intermediate energies by including both the quantum correction and Coulomb correction under the assumption of the effective nuclear density distribution. The calculated results of the total reaction cross section induced by stable nuclei agree well with 30 experimental data within 10 percent accuracy.The comparison between the numerical results and 20 experimental data for the total nuclear reaction cross section induced by the neutron halo nuclei and the proton halo nuclei indicates a satisfactory agreement after considering the halo structure of these nuclei, which implies quite digerent mean fields for the nuclear reactions induced by halo nuclei and stable nuclei. The halo nucleon distributions and the root-mean-square radii of these nuclei can be extracted from the above comparison based on the improved Glauber model, which indicates clearly the halo structures of these nuclei. Especially,it is clear to see that the medium correction of the nucleon-nucleon collision has little effect on the total reaction cross sections, induced by the halo nuclei due to the very weak binding and the very extended density distribution. 相似文献
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TANYu-Hong LUOYah-An NINGPing-Zhi 《理论物理通讯》2003,40(1):91-94
Effect of conversion process (≡^-P→AA) on ≡--hypernucleus is studied for ≡^12-Be. It is found that the conversion process has a certain extent effect on properties of low-lying states of the ≡^--hypernuclei. 相似文献
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SONGLi-Tao ZHOUXiao-Hong ZHANGYu-Hu GUOYing-Xiang SUNZhi-Yu M.Oshima T.Toh A.Osa M.Koizumi J.Katakura Y.Hatsukawa M.Matsuda M.Sugawara 《中国物理快报》2004,21(7):1243-1246
A standard in-beam γ-spectroscopy experiment for^179 Au has been performed via the ^149Sm (^35Cl, 5n) reaction at beam energies of 164-180 MeV. Based on the analysis of the experimental results, a rotational band built on 1/2[660](π^i13/2)proton intruder orbital is established for^179 Au for the first time. Systematic properties of the 1/2[660](π^i13/2) band in odd-A Au nuclei are discussed,and the evolution of bandhead energy and deformation with changing neutron number are revealed. 相似文献
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By analysing the known low-lying levels and the E2 transition rates, it is shown that the empirical scheme of 114Cd is in good overall agreement with the predictions of the transitional dynamical symmetry E(5) proposed by Iachello [Phys. Rev. Lett. 85 (2000) 3580]. This suggests that 114Cd may be better described by an E(5) nucleus than a U(5) nucleus as known before. 相似文献
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Non—statistical Fluctuation of COmpound Multiplicity in Nucleus—Nucleus Interactions:Evidence of Strong Intermittency 下载免费PDF全文
We present a study of the compound multiplicity distribution in terms of scaled factorial moments of orders 2,3,4 and 5 in 24Mg-AgBr interactions at 4.5 AGeV.the study reveals a strong signal of the intermittent pattern of fluctuation in the compound multiplicity distribution. 相似文献
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原子核的形状是其看似简单的微观性质 ,然而却是很难测量的 .一般说来质子与中子都处于满壳层的核是球形的 .满壳层外增加几个质子或中子时 ,核将发生形变 .较轻的N =Z的核 ,如He - 4、C - 12、O - 16和Ca -4 0是相当稳定的 ,也是地球上 ,特别是生命物质中 ,最重要的一些核素 . 相似文献
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《中国物理快报》2003,20(8):1223-1226
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原子核衰变的模拟实验 总被引:2,自引:0,他引:2
原子核衰变的模拟实验伍祥生(湖南师大物理系)在物理教学中,原子核的放射性衰变内容比较抽象,在讲解时,让学生做一个测量水柱高度的减少和它的半衰期的模拟实验,能使该内容变得直观.学生通过观察、操作和测量,容易掌握原子核的放射性衰变的规律.一、模拟实验的原... 相似文献
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We investigate the nuclear shadowing effect on the K factor in the Drell-Yan process by introducing a Shadowing factor into the corresponding quantum chromodynamical αs order corrections.K factors for Au-Au collisions are calculated at the centre-of-mass system energies √s=60,130 and 200 GeV while the nuclear shadowing factor is taken into account.The numerical results indicate that the nuclear shadowing factor obviously raises the K value in the small x region,and for the same nucleon the K valus becomes smaller as the energy increases.The nuclear shadowing effect could be one reason for creating the non-constancy of the K factor. 相似文献
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原子核低激发谱对深入理解原子核结构具有重要作用。采用多任务反向传播(Back Propagation,BP)的神经网络方法系统研究了原子核2 1+和4 1+的激发能量。除了质子数和中子数外,通过在网络输入层增加一个有关原子核集体性的物理量,BP神经网络在0.1 MeV到数MeV的能量范围内很好地拟合了原子核的低激发能。相比五维集体哈密顿量(Five-Dimensional Collective Hamiltonian,5DCH)方法,BP神经网络更好地再现了原子核低激发能的同位素趋势,以及由壳效应导致的幻数原子核低激发能的突然增大,并且将2 1+和41+激发能的预言精度分别提高了约80%和75%,该预言精度与单任务神经网络基本一致,但是改进了对轻核区与缺中子核区低激发谱的学习能力,这说明多任务神经网络可以实现多种激发能量的统一精确计算。 相似文献
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