共查询到20条相似文献,搜索用时 15 毫秒
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The accurate solutions for the low-lying eiginvalues and eigenstates of the single-j CSM hamiltonian have been obtained and are compared with the HFB approximation.There exist a world of difference between the two,especially the behaviour of the yrast and the yrare bands near the bandcrossing and the band interaction strength.The theoretical foundation of the CHFB method for treating the rotating nuclei needs reexamination. 相似文献
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电子与库仑势散射,在圆极化、偶极近似的外光场作用下,其Schr?dinger方程可通过么正变换并引入修饰势来讨论。对修饰势选取恰当的公式展开,并用Floquet分波法,可分离出径向波动方程组,它在弱耦合近似下是可积的,并且近似的波函数,S矩阵和截面可解析表示,其结果与数值迭代解作了比较。
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本文探讨当一无限长黑圆柱放在一满足密恩问题中诸条件的无限介质中时,介质中的中子分布。计算采用球谐函数展开法,把中子分布函数对球谐函数展开,保留展开式的起首若干项,从而求得近似解。具体计算作到P5近似为止。表2及附图示各次近似中对於圆柱半径α的不同值求出的外推长度λ之值。作为长度单位的是中子在介质中的平均自由路程l。为比较起见,我们在图中也画出了达维逊(Davison)给出的曲线(曲线D)。他的曲线是根据α《1及α》1二极限情形下派耳斯(Peierls)积分方程的近似解,中间参照P3近似的结果画出的。由图可见,α大时P5近似的结果已很接近於曲线D,而在α=1附近,则曲线D似乎远应该略低一些,才更符合曲线P5的趋势(例如,像图中虚线所表示的那样)。 相似文献
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CORRELATION BETWEEN GREY PARTICLES AND THE NUMBER OF THE hN COLLISIONS INSIDE NUCLEUS A IN HIGH ENERGY hA INTERACTION 下载免费PDF全文
Considered the intranuclear cascade,a model for describing the distribution of grey particles in high energy hA interactions is proposed.An agreement between experimental data and the model is obtained in pA interactions and the number of grey particles could be used reasonably to measure the number of hN collision inside A. 相似文献
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WU Hui-Fang 《中国物理C(英文版)》1986,10(1):124-128
Formulae for the meson exchange are deduced by using the spherical wave expansion in the nonrelativistic approximation. They will be convenient for calculating the corrections to the nuclear electromagnetic matrix elements of the meson exchange current operator. 相似文献
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在分析用差分方法求解虚共焦非稳腔三维傍轴波动方程,及用数值积分方法与快速付氏变换(FFT)方法求解三维菲涅耳积分方程优缺点的基础上,从激光束在虚共焦非稳腔中以修正高斯球面波形式传输的特征出发,经坐标变换把发散(或会聚)的光束拉直成平行光束,然后用FFT方法求解了在新坐标系中修正函数满足的傍轴波动方程.把相同条件下得到的结果与国内外文献给出的结果进行了比较;计算COIL实验非稳腔给出的近远场结果图象合理正确. 相似文献
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YANG Li-ming 《理论物理通讯》1982,1(5):557-568
For strongly pair-correlated systems, a new transforniation is derivqd similar in form to the usual Bogoliubov-Valatin transformation, but with the transformation coefficients replaced by operators. The original fermion operators Cα+, Cα are now replaced by two sets of independent operators, the pair operators Sα+, Sα and the quasi-fermions aα+, aα The transformation conserves the particle number. Among other applications, it is particularly suited for the construction of a microscopic theory of the type of the interacting boson model. The new transformation given here also serves to provide a connection between the usual ph picture of a phonon and the pp picturevof bosons in IBM. However, the boson picture that evolves from the present formulation differs from the ideal boson picture in IBM. 相似文献
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1 IntroductionSphericaltokamakhasnotbeenpaidmuchattentionuntilSTART[1] successfullyoperated .Therearetwounpredictedfeaturesinthesphericaltokamak.First,thereisnaturaldivertorconfigura tion .Secondly ,thereisnomajordisruptioninfirst3 0 0 0 0ohmicdischarges .Thepla… 相似文献
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采用六方格子上的动力学流行病模型描述流体凝固过程,根据流体中所含杂质粒子与固态粒子间的短程推斥作用,导出了被陷杂质粒子与固态粒子的密度比方程.并得到方程所含的两个变量χ与r之间有如下关系:当r为有限值时,分形生长局限于该区域 r无解时,集团可无限生长,在平面上形成较密集集团,维数Db→2 仅当r的解为∞时,分形生长可无限进行,该点χ即为阈值χc.由此,得到六方格子上阈值χc≈0655,与计算机模拟结果相符合,大于四方格子的结果χc(s)(∞)=0560±0005.
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An ideal current distribution in the air-core transformer coils is obtained using variation principle.Climbing mountain method is utilized for optimizing the dimension and position of the real coils.Not only can the requirement of minimizing the stray field in the plasma region be guaranteed,but also integer turns for the coil can be realized.The latter brings a significant convenience to engineering. 相似文献