299 resultados para 197-1206


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本文简单地介绍远离β-稳定线重质量丰中子核的合成和研究的科学意义。扼要叙述X-γ符合技术(元素指定方法)。指出X-γ符合方法在远离β-稳定线重丰中子核研究中的重要作用。借助于X-γ方法先后研究了一些如~(175)Er、~(197)Os、~(229)Ra、~(238)Th和~(186m)Ta等重丰中子核。

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首先介绍了小波变换的基本原理,并在此基础上说明了如何根据所要分析的信号设计双正交小波。实践结果表明,将基于特定信号设计的双正交小波变换技术应用到图像处理上会有很好的效果。

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报道了由兰州ECR源提供的低速高电荷离子40Ar16+入射到云母表面产生的电子发射的实验测量结果.结果发现,电子发射产额Y与离子入射角ψ有近似1/tanψ的关系.基于经典过垒模型,我们对这一关系进行了理论分析.实验结果和理论结果相当符合,这就间接说明势能电子发射是低速高电荷态离子作用于表面发射电子的一个主要途径.

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介绍了一种比较先进的远程电源监控系统的设计和实现,它采用了嵌入式系统和COM组件技术,自行设计了部分软、硬件,通过以太网实现远程控制。

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根据重离子在CR39中能量损失率公式,建立了一个鉴别空间重离子的数学模型LET=cZdRb.通过传能线密度与剩余射程之间的关系曲线,获得了该模型的系数.在实验中发现的CR39蚀刻率与离子有限传能线密度的关系VT=A·(REL)BE<350,被用来与该数学模型相关联,并得到一等式R=A0.0455Z3.18V-1T.最终,借助于标定实验得到了离子鉴别公式Z3.18=64541.08+2.53(dR/dV-1T).

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介绍利用反应显微成像谱仪实验研究高电荷态离子与原子分子碰撞动力学的技术 ,讨论了实验测量反应末态全部离子和电子动量矢量 ,得到反应末态动量空间的全部信息 ,从而反演碰撞反应动力学过程的路线。描述了在近物所开展量子多体动力学实验研究的计划。

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指出了中子源的重要性,扼要地说明了加速器中子源的特点。简单地介绍了14 MeV中子引起的核反应,发现了14 MeV中子可以引起重核的奇异(n,2p)反应,并以此为基础,形成了合成和研究重丰中子新核素的一条物理思想和生成、分离鉴别技术路线;先后合成和研究了~(185)Hf、~(237)Th、~(175)Er和~(197)Os等四种重丰中子新核素。

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为了进行重离子束流的肿瘤治疗和生物效应的研究,HIRFL正在建造一个辐照治癌终端.主要介绍了该终端的束流制备方法和束流线的布局、性能参数和束流光学设计计算结果.

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利用考虑了量子修正、库仑修正、核子 -核子碰撞同位旋效应和假定有效原子核密度分布后得到的改进的Glauber理论 ,计算了晕核与稳定核反应总截面 ,研究了晕核结构对反应总截面的影响 .结果发现对于11Be ,14Be和11Li等入射核 ,必须考虑它们的晕核结构和利用自由的核子 -核子碰撞截面才能得到与实验符合的反应截面 ,并可依据反应总截面来确定晕核的密度分布和均方半径等信息

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根据一个新型高速多道脉冲分析系统的结构和设计 ,提出一种全新的控制用状态机模型 ,并予以实现 ,以低成本实现了对整个系统的简单、灵活和全面的控制

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Within the framework of the improved isospin dependent quantum molecular dynamics (ImIQMD) model, pion emission in heavy-ion collisions in the region 1 A GeV is investigated systematically, in which the pion is considered to be mainly produced by the decay of resonances Delta(1232) and N*(1440). The in-medium dependence and Coulomb effects of pion production are included in the calculation. Total pion multiplicity and pi(-)/pi(+) yields are calculated for the reaction Au-197+(197) Au in central collisions for selected Skyrme parameters SkP, SLy6, Ska, SIII and compared with the measured data of the FOPI collaboration.

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An experiment of a S-29 beam bombarding a Au-197 target at an energy of 49.2 MeV/u has been performed to study the two-proton correlated emission from S-29 excited states. Complete-kinematics measurements were carried out in the experiment. The relative momentum, opening angle, and relative energy of two protons, as well as the invariant mass of the final system, were deduced by relativistic-kinematics reconstruction. The Si-27-p-p coincident events were picked out under strict conditions and the phenomenon of p-p correlations was observed among these events. The mechanisms of two-proton emission were analyzed in a simple schematic model, in which the extreme decay modes like He-2 cluster emission, three-body phase-space decay, and two-body sequential emission were taken into account. Associated with the Monte Carlo simulations, the present results show that two protons emitted from the excited states between 9.6 MeV and 10.4 MeV exhibit the features of He-2 cluster decay with a branching ratio of 29(-11)(+10)%.