142 research outputs found

    兰州放射性束流线

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    兰州放射性束流线(RIBLL)是产生中能重离子放射性束流(RIB)的装置和高精度放射性束物理的实验谱仪.RIBLL的立体角接收度>65msr、动量接收度达10%;RIBLL可提供极化RIB;RIBLL采用大接收度双消色差反对称结构,既可纯化放射性束,还可作为0°磁谱仪.Radioactive Ion Beam Line in Lanzhou (RIBLL) is a facility to produce intermediate energy radioactive ion beams (RIB), and also a high precision spectrometer for RIB physical experiments. The solid angle acceptance of RIBLL is 6. 5 msr. The momentum acceptance is about 10%. The polarized RIBs will be available. RIBLL is the equipment with double achromatic and asymmetric structure. So that it can not only sublimate the RIBs in pureness, but also operate as 0° magnet spectrometer.国家自然科学基金!19675055,1950500

    粒子的横向运动对环形质谱仪性能的影响

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    分析了粒子的横向运动对环形质谱仪的分辨本领及测量精度的影响,给出了计算这些影响的方法The effect of the transverse motion on the resolution power and measurement accuracy of the circular mass spectrometer is analyzed. Related expressions for determining these effects are given

    直接鉴别超重元素Z和A的一种新的可能方法

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    随着合成的超重元素向超重岛逼近,合成截面越来越小,同时,合成的超重元素的寿命可能相对增长,这对利用α衰变链的传统方法鉴别超重元素是非常不利的。讨论了可能突破这个瓶颈的一种可以直接鉴别超重元素原子序数Z和质量A的新方法,即与RFQ离子阱技术相结合的激光多步共振电离方法,对实现这种方法的途径、该方法所面临的困难和挑战、需要进行的前期研究工作以及该方法的可能性和可行性进行了较详细的讨论

    远离β稳定线奇特核的性质

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    远离β稳定线奇特核性质的研究,是沿同位旋自由度拓宽了传统的核物理研究领域,也是当前核物理研究中的热点之一,在国际上深受重视。本文简单介绍了远离β稳定线奇特核性质研究的现状及其意义。国家教委留学回国人员基金;;国家自然科学基金;;中国科学院近代物理研究所HIRFL—CSR资助项

    兰州冷却环总体设计

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    兰州重离子冷却环CSR是兰州重离子加速器研究装置HRRFL的一项升级工程,是一个双冷却储存环系统,由主环CSRm和实验环CSRe构成.从HIRFL回旋加速器系统来的重离子束,首先注入到主环CSRm中进行累积冷却,然后加速到较高的能量引出打初级靶产生放射线次级束RIBs或高离化重离子束,这些次级束再被送到验环CSRe储存起来以开展内靶实验

    HIRFL-CSR实验环高频同轴谐振腔设计原理

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    介绍了同步加速器高频铁氧体加载腔体的设计原理和设计计算过程。详细说明了腔体加载铁氧体材料的作用和意义,并对传统的传输线理论计算结果、CST(Computer Simulation Technol-ogy)软件模拟计算结果和实际腔体测量结果进行了比较

    CR环二极磁铁的磁场优化

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    FAIR项目中的CR环二极磁铁对磁场积分场的误差分布要求很高,通过削斜与加载镜像板的方法是优化磁场的主要方法,文中介绍了对二极磁铁优化方法和对它的处理方法.利用削斜的方法来改变二极磁铁积分场的误差分布,通过复杂的削斜,已将其高场的误差分布优化到±2×10~(-4).加镜像板的方法主要适合高场,而对低场的调节不明显.另外处理方法的选取对结果的影响也很大,文中对两种方法作了比较.优化模拟计算软件采用的是专门的磁场计算工具OPERA

    Field Rainfall Experiment on the Disturbed Lands During

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    神府东胜煤田是我国探明储量最大的煤田,在开发建设过程中产生了大量的扰动地面,造成了严重的矿区水土流失。为了科学地预测和治理矿区扰动地面的水土流失,采用野外人工模拟降雨试验对神府东胜煤田扰动地面的侵蚀产沙过程进行模拟,深入探讨其侵蚀产沙、产流特征。结果表明:降雨强度是影响扰动地面产流时间的主要因素,产流时间与降雨强度呈负幂函数相关;在试验条件限定的范围内,入渗率随降雨强度和坡度的增大均呈先增大后稳定的趋势,但坡度对其影响较弱;径流率随降雨强度和坡度的增大均呈幂函数增大,且相关系数较高;径流含沙量和侵蚀速率均与降雨强度呈幂函数相关,但相关系数不高;径流量与降雨强度呈很好的线性相关;产沙量与径流量呈幂函数相关,且相关系数较高Abstract:Shenfu-Dongsheng coalfield has the largest proven reserves of coal in China.However,the exploitation of the Shenfu-Dongsheng coalfield badly disturbed the ground,which caused severely soil and water erosion.A field rainfall experiment on soil erosion,sediment yield and runoff yield on the disturbed lands wasconducted to provide scientific date for predicting and controlling soil and water loss on the disturbed lands.Results indicated that rainfall intensity was a major impact factor in the runoff generation time,with the increase of rainfall intensity,the runoff generation time of disturbed lands decreased with the negative powerfunction distribution range.Infiltration rate increased and then stabled with the increase of rainfall intensityand slope,but with the increase of slope,it changed not obviously.With the increase of rainfall intensity andslope,the runoff rate of disturbed roads increased within the power function distribution range.With the increase of rainfall intensity,the average sediment yield and erosion transport rate of disturbed roads increasedwith the power function distribution range.There was a linear regression between runoff amount and rainfallintensity,and a power regression between sediment yield and runoff amount,which had high correlation
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