Institutional Repository of Institute of Modern Physics, CAS

    RF system design and measurement of HIRFL-CSRe

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    An RF system for the CSRe (cooling storage experimental ring) is designed and manufactured domestically. The present paper mainly describes the RF system design in five main sections: ferrite ring, RF cavity, RF generator, low level system and cavity cooling. The cavity is based on a type of coaxial resonator which is shorted at the end with one gap and loaded with domestic ferrite rings. The RF generator is designed in the push-pull mode and the low level control system is based on a DSP+FGPA+DDS+USB inter..

    Extraction behavior of Mo and W as homologs of Sg with α-benzoinoxime

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    Solvent extraction of molybdenum and tungsten as homologues of Sg with a-benzoinoxime from HCl solutions has been investigated. The extraction equilibration was achieved at 20s for Mo and W. Molybdenum was almost quantitatively extracted from 0.001 to 4M HCl solutions, and the extraction yields decreased at higher and lower acid concentrations due to the formation of anionic oxychloride complex and anionic species MO42-, respectively. The extraction yield of W was lower than that of Mo during the whole range of acid concentration. The composition of the extracted species was determined by using the slope method in present experiment. The elemental analysis, IR and 1H NMR spectra of the extracted species suggest that the extracted complex contain one MoO22+or WO22+ groups bonded with two a-benzoinoxime molecules

    Design of general reconfigurable embedded micro-controller for synchrotron s monitor and control systems based on Nios-Ⅱ

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    FPGA and dedicated micro-controller chips are widely used in HIRFL-CSR monitor and control systems.This paper discusses the characteristics of HIRFL-CSR s dedicated micro-controllers and it s requirement for micro-controllers. Using programmable technology and Nios-Ⅱ processor,we have designed and implemented a reconfigurable embedded micro(controller in altera cycloneⅡ2c35f484 FPGA. The micro-controller which has low hardware cost and 185 MHz maximum operating frequency can replace the dedicated micro-cont...中文文摘:讨论并参考了冷却储存环目前使用的专用微控制器的特点和其对微控制器的需求,采用可编程技术和Nios-Ⅱ处理器,在altera-cycloneII2c35f484芯片内实现可重构微控制器。该微控制器硬件资源消耗少,最大工作频率可达185MHz,可代替目前在监控系统中大量使用的专用微控制器芯片,减小硬件设计复杂度、节约成本

    Study of High-spin Level Structure in Doubly odd Nuclei 190Tl and 146Tb

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    本论文介绍了原子核高自旋态研究的一般概况及有关核模型,描述了在束γ谱实验的原理与技术、数据分析与处理方法,然后着重分析和讨论了双奇核190Tl和146Tb高自旋能级结构的特性。 利用能量为175和167MeV的35Cl束流,通过反应160Gd(35Cl,5n)研究了双奇形变核190Tl的高自旋能级结构。实验进行了γ射线的激发函数和各向异度、X-γ和γ-γ-t符合测量,建立了由πh9/2νi13/2扁椭球转动带和一个具有单粒子激发特征的级联组成的190Tl能级纲图。确定地指定了190Tl的转动带自旋值,首次发现了190Tl πh9/2νi13/2扁椭球转动带的低自旋旋称反转。基于双奇核Tl能级结构的相似性,重新指定了双奇核192-200Tl πh9/2νi13/2扁椭球转动带能级自旋值,澄清了二十多年来国际上一直没有解决的自旋值指定问题且在这些扁椭形变核中均出现了低自旋旋称反转。考虑了p-n剩余相互作用的2-准粒子—转子模型定性地解释πh9/2νi13/2扁椭球转动带出现的低自旋旋称反转现象。 利用118Sn(32S ,1p3n)反应研究了双奇球形核146Tb的高自旋态,建立了激发能达8.39 MeV的能级纲图,其中包括新发现的41条γ射线和新建立的27个能级,并指定了新发现能级的自旋值和部分能级的组态。146Tb81的低位激发态是二准粒子态,高位的激发态是四准粒子态,或二准粒子与偶偶核芯低位激发态的耦合,更高位的能级则是六准粒子态,甚至八准粒子态。利用经验壳模型对部分全顺排组态的激发能进行了理论计算本论文介绍了原子核高自旋态研究的一般概况及有关核模型,描述了在束γ谱实验的原理与技术、数据分析与处理方法,然后着重分析和讨论了双奇核190Tl和146Tb高自旋能级结构的特性。 利用能量为175和167MeV的35Cl束流,通过反应160Gd(35Cl,5n)研究了双奇形变核190Tl的高自旋能级结构。实验进行了γ射线的激发函数和各向异度、X-γ和γ-γ-t符合测量,建立了由πh9/2νi13/2扁椭球转动带和一个具有单粒子激发特征的级联组成的190Tl能级纲图。确定地指定了190Tl的转动带自旋值,首次发现了190Tl πh9/2νi13/2扁椭球转动带的低自旋旋称反转。基于双奇核Tl能级结构的相似性,重新指定了双奇核192-200Tl πh9/2νi13/2扁椭球转动带能级自旋值,澄清了二十多年来国际上一直没有解决的自旋值指定问题且在这些扁椭形变核中均出现了低自旋旋称反转。考虑了p-n剩余相互作用的2-准粒子—转子模型定性地解释πh9/2νi13/2扁椭球转动带出现的低自旋旋称反转现象。 利用118Sn(32S ,1p3n)反应研究了双奇球形核146Tb的高自旋态,建立了激发能达8.39 MeV的能级纲图,其中包括新发现的41条γ射线和新建立的27个能级,并指定了新发现能级的自旋值和部分能级的组态。146Tb81的低位激发态是二准粒子态,高位的激发态是四准粒子态,或二准粒子与偶偶核芯低位激发态的耦合,更高位的能级则是六准粒子态,甚至八准粒子态。利用经验壳模型对部分全顺排组态的激发能进行了理论计

    Equation of motion approach to the anharmonic oscillator

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    Solvent extraction of (SC)-S-46 with PMBP

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    Systematic study of stability of super heavy nuclei

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    Highly ionized spectra of the transition sulfur

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