MICROSCOPIC CALCULATION OF VISCOSITY COEFFICIENT IN HEAVY NUCLEI

A realistic calculation of the viscosity coefficients for ²³⁶U from ground equilibrium shape to saddle point is presented based on the linear response theory, in which the single particle spectra and wave function are provided by generalized Nilsson model. The dependence of viscosity coefficients γ_δ2δ2, γ_δ3δ3, γ_δ4δ4, γ_δ2δ3, γ_δ2δ4, γ_δ3δ4, on the collective variables δ₂, δ₃, δ₄ is studied at various values of the nuclear temperature with the smearing width Γ=0.1hω₀.     

CALCULATION OF THE EFFECTIVE MOMENT OF INERTIA OF FISSIONING NUCLEI AT SADDLE POINT

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.     

椭球体转动惯量的计算

用分步计算和广义球面坐标变换两种方法对椭球体绕对称轴旋转的转动惯量进行了计算，计算表明，后一种方法简单、实用，在工程实际中有应用价值．     

MICROSCOPIC STUDY OF QUASI-ROTATIONAL BANDS IN DOUBLE-EVEN Sn NUCLEI

Based on the boson expansion and the so-called Jancovici-Schiff substitution,and approach has been developed to study the microscopic foundation of the interacting boson model.In this work an extension of the approach is made,thus one is able to treat the excitations of such system in which several neutron bosons,a proton boson and a proton-hole boson exist.With the consideration of the proton two-particle excitations we have studied the intruder quasi-rotational bands in double-even Sn nuclei.The Calculated results are compared with experiment and some features of the configuration mixture are discussed.     

EFFECTIVE MOMENT OF INERTIA OF MEDIUM MASS NUCLEI AT THE SADDLE POINT

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.     

THE MICROSCOPIC CALCULATION OF THE STATISTICAL THEORY OF NUCLEAR FISSION

Based on the statistical fission theory, we have calculated the mass and kinetic energy distributions as well as other physical quantities of ²³⁵U fission induced by thermal neutron using microscopical method. That is, the quantum state densities of the fragments at scission point are calculated by means of BCS hamiltonian. The contribution of the collective deformation of fragments to the quantum state density has been taken into consideration. The potential energy of fragment is calculated by means of Strutinski procedure, and the shelling effect, pairing correlation as well as collective deformation have been taken into consideration in calculating the excitation energy at scission point. The scission point distance is treated as an adjustable parameter.Comparing with other statistical fission theories, our results give better agreement with existing experiments.     

刚体绕任意轴转动惯量的简便计算

利用微元求和的方法给出几种刚体对于过质心任意轴的转动惯量公式，并由此引出转动惯量与刚体几何对称性的联系，以及与转动惯量有关的几何形体等价性的一些结果．     

MeV重离子在固体靶中的平均投影射程计算

根据Biersack角扩散模型,建立了计算MeV重离子在固体靶中的平均投影射程的方法。与新近发表的1.0MeV的In⁺,Xe⁺,Ta⁺和1.0—2.0MeV的Pb⁺在Si中的平均投影射程实验数据相比,本文计算值与实验值的最大偏离为8％,而Monte-Carlo(TRIM′86)和PRAL的计算值与实验值的最大偏离分别为23％和22％。这表明本文的计算在预言1.0—2.0MeV的重离子(In⁺,Xe 关键词：     

THE MOMENT OF INERTIA IN THE INTERACTING BOSON-FERMION MODEL

For a system described by the interacting boson-fermion model (IBFM),we construct the intrinsic states and study the moment of inertia of deformed odd-A nuclei in terms of the selfconsistent cranking calculation.An approximate analytic method for the energy spectrum is presented in the general cases where the IBFM Hamiltonian does not have dynamical symmetry.The rationality of this method is also discussed by taking ^153,155,157Eu isotopes as examples.     

HEAVY ION COLLISIONS AND QUARK DISTRIBUTION IN NUCLEI

The heavy-ion collisions are studied by means of two-component Fokker-Planck equations on the assumption that there exist multiquark states in nuclei. Inclusive cross section for the production of p is calculated in heavy-ion collisions of C+C, Ne+NaF and Ar+KCI at 800 MeV/N; Ne+NaF at 400 MeV/N, 800 MeV/N and 2100 MeV/N. A satisfactory agreement with the experimental data near c.m. 90 degree is obtained. The production of d in the collision of C+C at 800 MeV/N is also discussed.     

ON THE SPONTANEOUS PION EMISSION BY HEAVY NUCLEI

In this paper a method of detecting the pionic nuclear radio-activity discussed by Ion et al.is proposed using in clusive high energy gamma ray measurement.Taking the maximum pion energy given by Ion et al,the energy ranges of the gamma rays from the emitted π⁰ mesons are calculated.     

CALCULATION OF MICROSCOPIC OPTICAL POTENTIAL BY USE OF THE GENERALIZED SKYRME FORCES

In this paper the calculation of the microscopic optical potential based on thegeneralized Skyrme forces which describe both the ground and excited state propertiessimultaneously has been carried out for ²⁰⁵Pb ete. The volume integral per nucleon andthe root mean square radii of the real part as well as the imaginary part of the opticalpotential have been obtained. The angular distributions of the elastic scattering andthe total cross sections by use of our computed microscopic optical potential for ^20?Pbhave also been calculated. Compared with the conventional Skyrme forces, the calculat-ed results by the generalized Skyrme forces are evidently improved The presentcalculation is also in a good agreement with experiments for the incident energy lessthan 100 MeV.     

微机刚体转动惯量测定系统

本文介绍了微机刚体转动惯量测定系统的原理及实现方案，并指出在现有实验设备的基础上提高实验教学质量的方法和途径。     

用特征矩阵的伴随矩阵求解惯量主轴方向

本文给出了用特征矩阵的伴随矩阵求惯量主轴的代数方法，并通过实验作了说明。     

A=80区奇奇核的晕带能谱计算

采用二准粒子加轴对称转子模型,研究了A=80区部分奇奇核的晕带能谱,理论计算结果准确地再现了每个核的signature反转,并与实验值符合相当好- 关键词：     

重元素高阶电离势的计算

本文采用相对论多组态方法对部分重元素的高阶电离势进行了计算，对计算方法和其它近似计算进行了比较，指出在相对论性计算中的Ｋｏｏｐｍａｎｓ定理仍能得到近似的电离势值。     

SU(2)格点规范理论中的重夸克相互作用力及势的计算

本文用Monte Carlo方法对四维对称格点规范理论中具有较好标度性行为的单元格EXP作用量计算了重夸克-反夸克势。计算中利用了重整化群处理方法和SU(2)群的正二十面体子群近似。计算结果与维象的弦理论给出的库仑势加线性势的形式一致。 关键词：     

显微测温灵敏度的研究

本文叙述了显微测温仪的结构原理和温度灵敏度,并根据光学系统的参数和黑体辐射定律及探测器的噪音等效功率,推导出了NET的计算公式,从而为研制和应用显微测温仪器提供了重要依据.     

过渡区偶-偶核的振转耦合

本文在Bohr-Mottelson理论的基础上仔细考虑振转耦合,较好地解释了过渡区偶-偶核的能谱和跃迁几率。