共查询到18条相似文献,搜索用时 78 毫秒
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在相对论平均场理论的框架下,对Rn同位素链原子核的结合能、形变、同位素位移等若干基态性质进行了较详细的研究.结果表明,理论计算结果与已有的实验数据符合较好.原子核的四极形变主要出现在远离幻数的区域(N=110-124和N=129-142).而在中子数大于幻数的区域(N=127-142),十六级形变也非常明显.对电荷半径的研究显示,Rn同位素链的同位素位移曲线的斜率在中子幻数处出现明显的变化.
关键词:
相对论平均场理论
电荷半径
同位素位移
单粒子能级 相似文献
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利用形变约束的相对论平均场理论研究了Pt同位素偶-偶核的形状演化,比较了基态结合能和四极形变的理论计算值和实验值, 分析了这些核的位能曲线、单粒子能级及其随四极形变β2 的变化规律,发现从N=88到N=126, Pt同位素的基态变形从球形对称核经X(5)对称性核、演化为具有稳定形变的核,再演化为球形核的变化过程.其中, 166-172Pt是近球形核, 174Pt和192-196Pt位于球形和稳定形变之间,可能具有X(5)对称性, 176-190Pt具有稳定的变形, 198-202Pt是近球形核, 204Pt是球形核,这些结果与实验一致. 相似文献
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在相对论平均场理论框架下, 研究了各种对能隙参数对O同位素偶偶核的适用性. 通过对原子核结合能和四极形变的系统计算表明, 在O同位素区域, 对能隙参数Λn和Λp均可取为0.5, 这样既简化了计算, 又可得到比较满意的结果. 相似文献
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随着引力波探测以及对中子星质量与半径的高精度测量,中子星作为超新星爆发的剩余产物正吸引着相关领域的高度关注。在中子星的内核部分,诸如超子之类的奇异自由度有可能会出现从而形成超子星。本工作在相对论平均场模型框架下研究由核子与轻子构成的中子星以及包含超子的超子星。采用目前常用的非线性相对论平均场以及密度依赖的相对论平均场参数研究了超子对超子星质量、半径、潮汐形变等性质的影响。最后讨论了介子与超子的耦合常数对超子星性质的影响,发现当矢量介子与超子耦合系数较强时,利用现有的相对论平均场模型参数可以获得大质量的超子星。 相似文献
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用相对论平均场理论结合结团模型对重核结团现象进行了研究. 首先将原子核分为两个部分, 然后用相对论平均场模型对原子核的核子按束缚能的高低来分布, 结果获得了与实验相一致的结团. 这表明相对论平均场模型也适用于重核结团现象的研究. 相似文献
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A new determination of the Lambda-nucleon coupling constants in relativistic mean field theory is presented by optimizing both hyperon binding energy and spin-orbit splitting.Hypernuclear single particle spectra with the new coupling constants suggest the good agreement between the calculation and available data.The spin-orbit splitting of hyperon in medium mass hypernuclei is systematically larger than that in light-or heavy-mass hypernuclei.The sensitivity of the Lambda spin-orbit splitting to the omega-Lambda-Lambda tensor coupling term is also explored. 相似文献
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A new determination of the Lambda-nucleon coupling constants in relativistic mean field theory is presented by optimizing both hyperon binding energy and spin-orbit splitting. Hypernuclear single particle spectra with the new coupling constants suggest the good agreement between the calculation and available data. The spin-orbit splitting of hyperon in medium mass hypernuclei is systematically larger than that in light- or heavy-mass hypernuclei. The sensitivity of the Lambda spin-orbit splitting to the omega-Lambda-Lambda tensor coupling term is also explored. 相似文献
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The octupole deformations and other ground state properties of even-even Rn, Th and U isotopes are investigated systematically within the framework of the reflection asymmetric relativistic mean field (RAS-RMF) model. The calculation results reproduce the binding energies and the quadrupole deformations well. The calculation results indicate these nuclei at ground states evolve from neaxly-spherical (N = 130) shape to quadrupole deformation shape with the increase of the neutron number. It is also found that among the Rn isotopes, only^222,224 Rn axe oetupole deformed and the octupole deformations for them are small. However, more nuclei (N ≌ 134 148) in Th and U isotopes are octupole deformed and the octupole deformations for some of them are significant (|β3|- 0.1 or even larger). 相似文献
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在相对论平均场理论中引入同位旋标量-矢量介子ω张量项, 以208Pb为例,研究了张量项对原子核平均势场、介子场、自旋-轨道耦合势、单粒子能级的自旋-轨道劈裂和原子核壳层结构等的影响.结果发现张量项对核子平均势的影响主要表现在原子核的表面.随着张量耦合强度的增加, 自旋-轨道耦合势增强,单粒子能级的自旋-轨道劈裂增大,从而导致原子核单粒子能级的壳层结构发生很大变化,传统幻数所对应的主壳消失, 新的主壳出现. 相似文献
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We develop a relativistic nuclear structure model,
relativistic consistent angular-momentum projected
shell-model (RECAPS), which combines the relativistic mean-field
theory with the angular-momentum projection method. In this new
model, nuclear ground-state properties are first calculated
consistently using relativistic mean-field (RMF) theory. Then angular
momentum projection method is used to project out states with good
angular momentum from a few important configurations. By
diagonalizing the hamiltonian, the energy levels and wave
functions are obtained. This model is a new attempt for the
understanding of nuclear structure of normal nuclei and for the
prediction of nuclear properties of nuclei far from stability. In
this paper, we will describe the treatment of the relativistic mean
field. A computer code, RECAPS-RMF, is developed. It solves the
relativistic mean field with axial-symmetric deformation in the
spherical harmonic oscillator basis. Comparisons between our
calculations and existing relativistic mean-field calculations
are made to test the model. These include the ground-state
properties of spherical nuclei 16O and 208Pb, the
deformed nucleus 20Ne. Good agreement is obtained. 相似文献