超导高电荷态ECR离子源——一个引进、消化、吸收、再创新的典范

<正>由中科院近代物理研究所(简称近物所)承担的中科院知识创新工程重大项目“超导高电荷态ECR离子源”于2006年10月通过技术鉴定。包括方守贤等7位两院院士在内的专家鉴定委员会,审核和认可了由

一种适用于高速窄脉冲的峰值保持电路

介绍一种适用于高速窄脉冲的峰值保持电路,该电路输入信号的幅度≥50mV、前沿≤3ns、脉宽≤15ns、频率≥20MHz、增益为3,峰展宽时间可调(0.4-5μs)。该电路结构简单,可靠性好。

~(12)C离子束的剂量学研究

研究了L-α-丙氨酸剂量计测量12C离子辐射的剂量学特性,实验证明丙氨酸剂量计适用于12C离子辐射的剂量学测量。另外,还研究了12C离子照射人外周血诱发的染色体畸变(双着丝粒+着丝粒环)的剂量效应,在0—8.0 Gy范围内拟合的最佳回归方程为Y=0.858 503D+0.361 5×10-2D2。

利用可编程芯片设计的主放大器

介绍了核测量前端仪器小型化的方法,即使用可编程芯片。可编程芯片不仅包括可编程模拟芯片,还包括可编程逻辑芯片。利用可编程芯片实现主放电路可在保证各种技术指标的同时,做到可多个观测点选择显示和进行键盘控制观测结果。

RFQ冷却聚束器研究简介

详细论述了RFQ冷却聚束器相关的基本原理,简单介绍了国际上此方面的研究和我们的工作。

培基介导的辐射旁效应及机理初探

采用ICR小鼠,转移受照射细胞的条件培养液来培养未受照射细胞,检测YAC?I(小鼠T淋巴瘤)细胞对小鼠自然杀伤(NK)细胞的敏感性变化,测定小鼠脾细胞增殖能力,观察自由基清除剂二甲基亚砜(Dimethylsulfoxide,DMSO)照射前处理细胞的影响。初步研究了电离辐射旁效应(Bystandereffect,BE)及其可能的机理。结果显示,条件培养液培养的Yac?I细胞对NK细胞的敏感性明显升高。用条件培养液培养的小鼠脾细胞的增殖能力也明显受到抑制,提示辐射旁效应的存在,观察到DMSO对旁效应有一定的抑制作用,说明活性氧(Reactiveoxygenspecies,ROS)等自由基对旁效应有一定贡献。然而在淋巴细胞增殖实验ICM+1%DMSO组的数据显示DMSO对旁效应的抑制作用非常有限,表明除自由基外必定存在其他因素介导旁效应的发生。

Precipitation at Lake Qinghai；NE Qinghai-Tibet Plateau；and its relation to Asian summer monsoons on decadal/interdecadal scales during the past 500 years

IEECAS SKLLQG

Application Of (CS)-C-137 fingerprinting technique to interpreting sediment production records from reservoir deposits in a small catchment of the Hilly Loess Plateau；China

IEECAS SKLLQG

Summer monsoon intensity controls C-4/C-3 plant abundance during the last 35 ka in the Chinese Loess Plateau: Carbon isotope evidence from bulk organic matter and individual leaf waxes

IEECAS SKLLQG

内置垫补线圈的C型二极磁铁

对HIRFL CSR的原形磁铁进行了试制和研究.尝试了一种新的改善磁场分布的方法:在不增大极头的条件下使用两根内置导线,实践证明是可行的.用OPERA 2D和TOSCA 3D软件分析了垫补电流对中、低场的影响,同时也介绍了这块C型二极磁铁的制作工艺及磁场测量结果.

中子星内部各组分比例剖面

利用非对称核物质状态方程,基于β平衡及电中性条件,通过求解Tolman-Oppenheimer-Volkoff方程给出了常规中子星（n,p,e-和μ-组成）中各组分的比例关系及其径向分布.发现常规中子星内部存在一个半径大约为3.5km的纯中子物质芯.在半径大于3.5km时,质子、电子及μ-子比例随半径先增加然后减小,在半径为8 km处达到最大值.这些知识为进一步研究中子星的电磁性质及热力学演化提供了可能.

加速器驱动反应堆的靶实验及核废料嬗变与焚化

对加速器辅助驱动次临界核反应堆的最近研究进展 ,特别是靶实验结果 ,进行了评述 .通过对靶实验首次全产物截面的测定 ,达到了剥离反应与裂变反应二者产物的完全识别 .

Competition in rotation-alignment between high-j neutrons and protons in transfermium nuclei

The study of rotation-alignment of quasiparticles probes sensitively the properties of high-j intruder orbits. The distribution of very-high-j orbits, which are consequences of the fundamental spin-orbit interaction, links with the important question of single-particle levels in superheavy nuclei. With the deformed single-particle states generated by the standard Nilsson potential, we perform Projected Shell Model calculations for transfermium nuclei where detailed spectroscopy experiments are currently possible. Specifically, we study the systematical behavior of rotation-alignment and associated band-crossing phenomenon in Cf, Fm, and No isotopes. Neutrons and protons from the high-j orbits are found to compete strongly in rotation-alignment, which gives rise to testable effects. Observation of these effects will provide direct information on the single-particle states in the heaviest nuclear mass region.

gamma-vibrational states in superheavy nuclei

Recent experimental advances have made it possible to study excited structure in superheavy nuclei. The observed states have often been interpreted as quasiparticle excitations. We show that in superheavy nuclei collective vibrations systematically appear as low-energy excitation modes. By using the microscopic Triaxial Projected Shell Model, we make a detailed prediction on gamma-vibrational states and their E2 transition probabilities to the ground state band in fermium and nobelium isotopes where active structure research is going on, and in (270)Ds, the heaviest isotope where decay data have been obtained for the ground-state and for an isomeric state.