A～190区奇-A及奇奇核全同带的研究

应用包含单极对力及四极对力的粒子数守恒方法对A～190区的奇奇核¹⁹⁴Tl和奇A核¹⁹³Tl中的全同带进行了研究.结果发现堵塞效应对全同带的形成及转动惯量随角频率变化的微观机制都起着非常重要的作用.同时文中对¹⁹⁴Tl的6条超形变转动带相对于¹⁹³Tl(1)的角动量顺排i(ω)的量子化也做了研究.     

Odd-Even Effects of the Survival Probability for Superheavy Compound Nuclei

The survival probability of the superheavy compound nuclei with Z=114 is studied with the statistical model. It is found that the survival probability shows drastic odd-even effects. The odd-A compound nuclei have higher survival probability by evaporating three neutrons as compared with their neigbouring even-A compound nuclei.     

双核系统核子交换势能面

实验证实,用重离子碰撞合成超重原子核时,准裂变对熔合的抑制是非常重要的.碰撞中双核系统间核子转移所形成的势能面称之为驱动势,它制约核子转移,因而决定熔合与准裂变的竞争.双核系统势能面还提供重离子碰撞合成超重原子核的最佳激发能和最佳弹靶组合的信息.     

在量子分子动力学模型中与N,Z有关的宏观势对碎片形成的影响

基于QuantumMolecularDynamics(QMD)模型,在Skyrme类型势,Yukawa和库仑相互作用势外,又考虑了与碎片集团的中子、质子数相关的宏观势,即波滴模型中的对称能再加上壳修正能和对修正能.这样的考虑改善了中能重离子反应中集团形成的合理结构.     

一个简单的K+N二体势

由夸克组分模型出发得到了既包含有心部分也包含自旋轨道耦合部分的一个简单的具有解析形式的K⁺N二体势,它可较好地解释S波和P波K⁺N二体散射相移,特别是P波的I=0,J=1/2道的大相移.     

转动核对转移矩阵元与Berry相位

采用粒子数守恒方法,对推转壳模型(j=11/2)进行了精确计算,详细分析了转动原子核中对转移矩阵元随转动频率的变化.与粒子数投影的Hatree-Fock-Bogoliubov方法导出的结论相反,“diabolic对转移”现象仅出现在高激发带,而晕带到晕带的对转移矩阵元则变化较为缓慢,并不出现振荡现象.     

Effects of 5 Meson on Thermal Protoneutron Star Matter

In the framework of the relativistic mean field theory, the effects of the 6 meson on protoneutron star matter with hyperons at finite temperature are investigated. In thermal protoneutron star matter, the 6 field potential increases with density first and then decreases. Fixing the density, the increase of the temperature suppresses the 6 field potential. With the inclusion of the 6 meson, the threshold densities for hyperons become lower and the abundance of trapped neutrinos decreases. The most important effect of the 6 meson is to increase the abundance of hyperons in the inner core range of protoneutron stars. With the rise of the temperature, the density range where the 6 meson plays an important role is narrowed and the effects of the 6 meson are suppressed. Moreover, the protoneutron star mass and radius are nearly not affected by the 6 meson.     

宏观微观模型对重核区原子核基态性质的研究

利用连续介质模型并基于Nilsson模型考虑微观修正, 研究了重核区原子核( Z≥82)基态性质, 得到了较好的结果。 通过拟合 Z≥82原子核的结合能实验数据, 得到了两组连续介质模型的新参数。 利用这两组参数计算的重核结合能与实验值的均方根偏差约为0.8 MeV, 电荷半径的均方根偏差约为0.07 fm。 The continuous medium model with shell correction from Nilsson model is used to study the ground state properties of heavy nuclei (Z≥82). New parameters are obtained for the continuous medium model by fitting the experimental binding energies. The theoretical calculations for the masses and radii are in good agreements with experimental values, and the root mean square deviations are about 0.8 MeV for the masses, and about 0.07 fm for the radii.     

Decomposition of the equation of state of asymmetric nuclear matter into different spin-isospin channels

We investigate the equation of state of asymmetric nuclear matter and its isospin dependence in various spin-isospin ST channels within the framework of the Brueckner-Hartree-Fock approach extended to include a microscopic three-body force（TBF） . It is shown that the potential energy per nucleon in the isospinsinglet T = 0 channel is mainly determined by the contribution from the tensor SD coupled channel. At high densities,the TBF effect on the isospin-triplet T = 1 channel contribution turns out to be much larger than that on the T =0 channel contribution. At low densities around and below the normal nuclear matter density,the isospin dependence is found to come essentially from the isospin-singlet SD channel and the isospin-triplet T = 1 component is almost independent of isospin asymmetry. As the density increases,the T = 1 channel contribution becomes sensitive to the isospin asymmetry and at high enough densities its isospin dependence may even become more pronounced than that of the T = 0 contribution. The present results may provide some microscopic constraints for improving effective nucleon-nucleon interactions in a nuclear medium and for constructing new functionals of effective nucleon-nucleon interaction based on microscopic many-body theories.     

GCM理论中双定域场的确定和介子性质的计算

通过理论推导说明GCM中双定域场的真空组态等价于夸克的动力学质量。在瞬子稀薄液体近似下,求得了真空组态的解析表达式,在此基础上,计算了π介子、σ介子的衰变常数和质量,所得结果比现有的GCM计算有明显的改进。