论文标题
甚至Xenon同位素链的伽马带状态的核形状过渡，三轴性和能量破坏
Nuclear Shape Transition, Triaxiality and Energy Staggering of gamma Band States for Even-Even Xenon Isotopic Chain
论文作者
论文摘要
在相互作用的玻色子模型（IBM1）的修改O（6）极限的框架内研究了均匀的XE核的正值状态。引入了有效的三体相互作用[QQQ]，其中Q是IBM O（6）四极杆操作员以表现出三轴性质。核表面的形状通过使用固有的连贯状态来描述变形参数beta，伽马。计算并分析了过渡U（5） - 三轴性-O（6）的势能表面（PES），并确定了临界相变点。对于每个核，采用拟合程序来获得最佳的模型参数，通过将一些选定的计算能水平拟合，而B（E2）过渡速率比与实验率相比。分析这些比率是因为它们是形状相变的有效订单参数。 XE同位素链中的细胞核通过将玻色子数从n = 3（重量同位素132xe）增加到n = 10（轻质同位素120xe），而同位素126xE则代表关键核。核128xE具有三轴性质。为了处理118-128X同位素链中伽马频带中的高自旋状态以研究和表现出奇特的自旋能破坏性，我们引入了两个参数集体核软性转子模型（CNS2）。根据将两个旋转家族和每个自旋家族中的四极转变连接起来的偶极转变的三个不同的惊人指数。已经看到了强烈的旋转能量的强烈旋转能量。作为IBM和CNS2模型之间的连接
The positive-parity states of even-even Xe nuclei are investigated within the framework of modified O(6) limit of the interacting boson model (IBM1). The effective three-body interaction [QQQ] where Q is the IBM O(6) quadrupole operator is introduced to exhibit the triaxiality nature. The shape of nuclear surface is described by the deformation parameters beta, gamma by using the intrinsic coherent state. The potential energy surfaces (PES) of the transition U(5)-Triaxiality-O(6) are calculated and analyzed and the critical phase transition points are identified. For each nucleus a fitting procedure is adopted to get the best model parameters by fitting some selected calculated energy levels and B(E2)transition rates ratios with experimental ones. These ratios are analyzed because they serve as effective order parameters in the shape phase transition. The nuclei in Xe isotopic chain evolve from spherical vibrator U(5) to gamma-soft rotor O(6) by increasing the boson number from N=3 (heavy isotope 132Xe) to N=10 (light isotope 120Xe) and the isotope 126Xe represent the critical nucleus. The nucleus 128Xe has triaxial nature. To deal with high spin states in gamma band in 118- 128Xe isotopic chain to investigate and exhibit the odd-even spin energy staggering, we introduce the two parameters collective nuclear softness rotor model (CNS2). Three different staggering indices depending on the dipole transitions linking the two families of spins and the quadrupole transitions within each spin family are considered. Strong odd-even spin energy staggering has been seen. As a link between the IBM and CNS2 models we observed that the energy difference between the gamma-band and ground state band normalized to decreases with increasing the mass number
