【目的】研究A≈160质量区奇A核高激发态的形状演化性质。【方法】基于来自 National Nuclear Data Center的实验数据，采用修正后的 E-Gamma Over Spin（E-GOS）曲线方法首次系统性地探讨了A≈160质量区奇A核处于高激发态的激发特性。...【目的】研究A≈160质量区奇A核高激发态的形状演化性质。【方法】基于来自 National Nuclear Data Center的实验数据，采用修正后的 E-Gamma Over Spin（E-GOS）曲线方法首次系统性地探讨了A≈160质量区奇A核处于高激发态的激发特性。【结果】提取得到的E-GOS曲线表明该质量区原子核的形变与未配对中子的组态密切相关，当核外价中子占据高j 轨道时，随着角动量的增加将对核芯产生强大的形状驱动效应。此外，根据E-GOS曲线的变化特征，发现在 Yb同位素的高自旋能级结构中存在明显的形状演化现象，即随着角动量的增加原子核的激发机制从振动逐渐演化为转动。【结论】在A≈160质量区奇A核中系统性地存在形状演化现象。展开更多
用反射不对称相对论平均场理论(Reflection Asymmetric Relativistic Mean Field,i.e.:RAS-RMF)对Ce同位素链的基态性质及形状演化进行了研究.结果表明:引入反射不对称自由度自由度,RMF理论能很好地描述Ce同位素的基态性质,计算的结合...用反射不对称相对论平均场理论(Reflection Asymmetric Relativistic Mean Field,i.e.:RAS-RMF)对Ce同位素链的基态性质及形状演化进行了研究.结果表明:引入反射不对称自由度自由度,RMF理论能很好地描述Ce同位素的基态性质,计算的结合能与实验数据符合得相当好,获得的形变参数、单粒子能级、物质密度分布及位能曲线清晰地展现出偶偶核Ce同位素的形状演化.展开更多
利用反射不对称相对论平均场理论(reflection asymmetric relativistic mean field,简称RAS-RMF)对Xe、Ba和Ce同位素偶偶核形状演化进行研究.结果表明:RAS-RMF理论能很好地描述Xe、Ba和Ce同位素偶偶核的基态性质,计算出的结合能和四极...利用反射不对称相对论平均场理论(reflection asymmetric relativistic mean field,简称RAS-RMF)对Xe、Ba和Ce同位素偶偶核形状演化进行研究.结果表明:RAS-RMF理论能很好地描述Xe、Ba和Ce同位素偶偶核的基态性质,计算出的结合能和四极形变与已有的实验数据一致,八极形变对基态性质有重要影响.获得的物质密度分布清晰地展现出Xe、Ba和Ce同位素偶偶核的形状演化规律,反射不对称自由度在其中起重要作用.展开更多
The influences of the mask wall angle on the current density distribution,shape of the evolving cavity and machining accuracy were investigated in electrochemical machining(ECM) by mask.A mathematical model was develo...The influences of the mask wall angle on the current density distribution,shape of the evolving cavity and machining accuracy were investigated in electrochemical machining(ECM) by mask.A mathematical model was developed to predict the shape evolution during the ECM by mask.The current density distribution is sensitive to mask wall angle.The evolution of cavity is determined by the current density distribution of evolving workpiece surface.The maximum depth is away from the center of holes machined,which leads to the island appearing at the center of cavity for mask wall angles greater than or equal to 90°(β≥90°).The experimental system was established and the simulation results were experimentally verified.The results indicate that the simulation results of cavity shape are consistent with the actual ones.The experiments also show that the repetition accuracy of matrix-hole for β≥90° is higher than that for β<90°.A hole taper is diminished,and the machining accuracy is improved with the mask wall angle increasing.展开更多
文摘【目的】研究A≈160质量区奇A核高激发态的形状演化性质。【方法】基于来自 National Nuclear Data Center的实验数据，采用修正后的 E-Gamma Over Spin（E-GOS）曲线方法首次系统性地探讨了A≈160质量区奇A核处于高激发态的激发特性。【结果】提取得到的E-GOS曲线表明该质量区原子核的形变与未配对中子的组态密切相关，当核外价中子占据高j 轨道时，随着角动量的增加将对核芯产生强大的形状驱动效应。此外，根据E-GOS曲线的变化特征，发现在 Yb同位素的高自旋能级结构中存在明显的形状演化现象，即随着角动量的增加原子核的激发机制从振动逐渐演化为转动。【结论】在A≈160质量区奇A核中系统性地存在形状演化现象。
文摘用反射不对称相对论平均场理论(Reflection Asymmetric Relativistic Mean Field,i.e.:RAS-RMF)对Ce同位素链的基态性质及形状演化进行了研究.结果表明:引入反射不对称自由度自由度,RMF理论能很好地描述Ce同位素的基态性质,计算的结合能与实验数据符合得相当好,获得的形变参数、单粒子能级、物质密度分布及位能曲线清晰地展现出偶偶核Ce同位素的形状演化.
文摘利用反射不对称相对论平均场理论(reflection asymmetric relativistic mean field,简称RAS-RMF)对Xe、Ba和Ce同位素偶偶核形状演化进行研究.结果表明:RAS-RMF理论能很好地描述Xe、Ba和Ce同位素偶偶核的基态性质,计算出的结合能和四极形变与已有的实验数据一致,八极形变对基态性质有重要影响.获得的物质密度分布清晰地展现出Xe、Ba和Ce同位素偶偶核的形状演化规律,反射不对称自由度在其中起重要作用.
基金Project(50635040) supported by the National Natural Science Foundation of ChinaProject(2009AA044205) supported by the National High Technology Research and Development ProgramProject(BK2008043) supported by the Jiangsu Provincial Natural Science Foundation,China
文摘The influences of the mask wall angle on the current density distribution,shape of the evolving cavity and machining accuracy were investigated in electrochemical machining(ECM) by mask.A mathematical model was developed to predict the shape evolution during the ECM by mask.The current density distribution is sensitive to mask wall angle.The evolution of cavity is determined by the current density distribution of evolving workpiece surface.The maximum depth is away from the center of holes machined,which leads to the island appearing at the center of cavity for mask wall angles greater than or equal to 90°(β≥90°).The experimental system was established and the simulation results were experimentally verified.The results indicate that the simulation results of cavity shape are consistent with the actual ones.The experiments also show that the repetition accuracy of matrix-hole for β≥90° is higher than that for β<90°.A hole taper is diminished,and the machining accuracy is improved with the mask wall angle increasing.
