单次分子镀法制备Sm和Eu厚靶

研究了在异丙醇-硝酸体系中单次分子镀流程制备Sm和Eu厚靶的实验条件。确定了在20μm铍箔上进行Sm和Eu分子镀实验的最佳工艺条件为：两极间距3cm,电流密度3.8mA/cm^2,分子镀过程持续1h。用分光光度法测定了分子镀的沉积效率均高于95%,所制备Sm和Eu靶膜的厚度分别在1.6和1.5mg/cm^2。     

单次分子镀法制备Sm和Eu厚靶

研究了在异丙醇-硝酸体系中单次分子镀流程制备Sm和Eu厚靶的实验条件。确定了在20 μm铍箔上进行Sm和Eu分子镀实验的最佳工艺条件为: 两极间距3 cm, 电流密度3.8mA/cm2, 分子镀过程持续1h。 用分光光度法测定了分子镀的沉积效率均高于95%, 所制备Sm和Eu靶膜的厚度分别在1.6和1.5 mg/cm2。     

分子镀制备三种镧系元素靶

采用分子镀方法研究了异丙醇-硝酸体系中两极间距离、电流密度、加入HNO3的量和分子镀持续时间对镀层性能和电沉积效率的影响,确定了制备Tb,Dy 和Ho 靶的最佳工艺条件。同时也探索了在异丁醇-硝酸体系中,分子镀持续时间和电流密度对Tb 靶电沉积效率的影响。因Tb,Dy 和Ho 三种元素化学性质相近,故采用了相同的工艺条件: 两极间最优距离为15 mm,电流密度为5.7 mA/cm2,加入0.1mol/L HNO3 400 L,分子镀时间为1 h。用分光光度法测得各靶的沉积效率均高于85%;利用扫描电子显微镜(SEM)对部分靶的表面形貌分析后发现靶面结构均匀致密;利用能谱仪(EDS) 对靶子进行了定性和半定量分析;利用红外光谱法对靶膜化学成分进行了分析,发现靶膜成分结构复杂,不是由一种化合物组成。目前制得的Tb 靶和Ho 靶已用于中国科学院近代物理研究所加速器SFC 低能核化学终端上,利用19F 束流轰击,分别产生了W和Os 的短寿命同位素,从而成功完成了Sg(Z =106) 和Hs(Z =108) 的模型试验。Preparation of Tb, Dy and Ho targets from the mixture of isopropanol and nitricacid solution are studied by using molecular plating technique. To determine the optimum conditions for the deposition process,the effect of distance between the two electrodes, current density, volume of 0.1 mol/L nitric acid, deposition time on the quality and electrodeposition yield of the target films are investigated individually. Preparation of Tb targets from the mixture of isobutylalcohol and nitricacid solution are also studied by using molecular plating technique. Depending on the similar chemical properties of Tb, Dy and Ho, the same process conditions are used.The suitable distance between the two electrodes is 15 mm. The current density is 5.7 mA/ cm2. The volume of nitric acid (0.1 mol/L) is 400 L. With the spectrophotometry method, the electrodeposition yields for all the targets prepared are found to be higher than 85% after one hour’s deposition. The morphological structure of some targets are characterized by scanning electron microscope (SEM) and it can be seen that the surface of the targets are uniform and intact. With EDS method, the composition of some targets are found to be very pure. The chemical structure of the targets are analyzed by Infrared Spectroscopy. It is found that the chemical structure of the targets are complex and the target membrane is not composed by only one compound. Short lived isotopes of W and Os were produced from natural Tb and Ho targets bombarded by 19F beam at the SFC low energy radiochemical terminal of Institute of Modern Physics, Chinese Academy of Sciences, respectively,and were successfully applied in the model experiment of Sg (Z =106) and Hs (Z =108).     

锕系核靶制备与应用北大核心CSCD

基础核物理、核能开发、超重元素研制等领域对精确、值得信赖的核参数的需求日益增大,锕系核靶作为核数据测量实验的核心部件,其产品种类及关键质量参数的优劣直接制约核数据测量的发展水平。系统介绍了国内外锕系核靶制备及检测方法以及国内外核靶研究团队技术储备及发展方向。     

朝阳1号聚碳酸酯记录~(238)U径迹的研究

本文研究了朝阳1号聚碳酸酯SSNTD记录~(238)U的特性。定出了~(238)U的实验射程。计算了~(238)U在此材料中的射程和限定能量损失率的能量关系。分析讨论了材料的响应范围及其对于重带电粒子的电荷分辨率和质量分辨率。     

双波长标准加入法同时测定钴镍合金镀液中的钴(Ⅱ)和镍(Ⅱ)

在 p H5 .0的乙酸 -乙酸钠缓冲溶液和聚乙烯醇体系中 ,钴 ( )和镍 ( )可与 PAN试剂形成稳定的络合物。以钴 ( )的 5 80 nm和 6 2 6 nm为测定波长对 ,镍作标准加入组分 ,双波长标准加入法可同时测定试样中钴、镍的含量。镍在 0— 15 μg/2 5 m L,钴在 0— 10 μg/2 5 m L范围内遵从比耳定律。对镀液样品进行测定 ,镍、钴的相对标准偏差 (n=6 )分别 <0 .82 %和 <1.2 %。     

用于ICF靶的空心玻璃微球的干凝胶法制备

 为用干凝胶法制备用于ICF靶的空心玻璃微球（HGM）,研究了载气组份、温度和压力对成球过程和HGM品质的影响,优化了制备工艺参数。结果表明：提高载气中氦气的含量,有利于增加干凝胶粒子的成球率和HGM的纵横比;适当提高载气中氩气的含量,有利于提高HGM的表面质量。降低载气压力可以提高HGM的纵横比;升高载气温度可以提高干凝胶粒子成球率和HGM品质。当载气中氦气的体积分数在50%~80%,载气压力在(0.75~1.00)×10⁵ Pa,载气温度在1 500~1 650 ℃时,干凝胶粒子的成球率较高,HGM的球形度、同心度和表面光洁度较好。制备得到了直径100~500 μm、壁厚0.5~3.0 μm的HGM,其耐压强度、抗大气侵蚀性能和表面粗糙度等指标均满足ICF物理实验要求。     

用于ICF靶的空心玻璃微球的干凝胶法制备

为用干凝胶法制备用于ICF靶的空心玻璃微球（HGM）,研究了载气组份、温度和压力对成球过程和HGM品质的影响,优化了制备工艺参数。结果表明：提高载气中氦气的含量,有利于增加干凝胶粒子的成球率和HGM的纵横比;适当提高载气中氩气的含量,有利于提高HGM的表面质量。降低载气压力可以提高HGM的纵横比;升高载气温度可以提高干凝胶粒子成球率和HGM品质。当载气中氦气的体积分数在50%~80%,载气压力在(0.75~1.00)×105 Pa,载气温度在1 500~1 650 ℃时,干凝胶粒子的成球率较高,HGM的球形度、同心度和表面光洁度较好。制备得到了直径100~500 μm、壁厚0.5~3.0 μm的HGM,其耐压强度、抗大气侵蚀性能和表面粗糙度等指标均满足ICF物理实验要求。     

200GeV/u的~(238)U+~(238)U核碰撞产生的双轻子谱(M≤4GeV/c~2)的计算

在夸克味动力学的计算中,除包含ｕ、ｄ、ｓ夸克及其反夸克外,还涉及粲夸克及其反夸克（ｃｃ）,采用包含夸克味动力学效应的相对论性流体力学模型,计算了碰撞能量为２００ＧｅＶ／ｕ的２３８Ｕ＋２３８Ｕ核碰撞时形成的膨胀ＱＧＰ及其在相变过程中发射的双轻子谱,轻子对的质量范围Ｍ≤４ＧｅＶ／ｃ２．计算结果与ＣＥＲＮＳＰＳ的实验测量数据进行了定性的比较和分析,得到初步的结论：由于夸克碎块和味动力学效应,Ｊ／ψ→μ＋＋μ－峰值被降低,导致低质量区（阈至１．３５ＧｅＶ／ｃ２）谱的提高．     

Study on the formation of the composite system of 238U+238U

Strongly damped reactions of 238U+238U, at Ecm = 680-1880 MeV have been studied based on the improved quantum molecular dynamics model. We find that at a certain energy region the entrance channel potential is weakly repulsive and the dissipation is very strong after touching configuration, these two effects make the time delay of re-separation for colliding system. The single particle potential well of the transiently formed composite system has Coulomb barrier about 15-20 MeV high at the surface, which makes the excited unbound protons being still embedded in the potential well and moving in a common mono-single particle potential for a period of time and thus restrains from quick decay of the composite system.     

CSR能区UU碰撞侧向流蒙特卡罗模拟与研究

应用ART模型研究了E_b=520MeV/u的UU碰撞. 探讨了在两种极端方位UU碰撞下, 核子和π在反应平面内的横向流的时间演化以及对碰撞中心度的依赖关系. 研究表明, 流在高密区域发展并且在膨胀相稳定, 因而它是高密区域反应动力学的一个敏感探针. 对头头和体体UU碰撞, 末态π相对于核子的横向流分别在大约b=9fm和b=2fm处存在明显的正向到负向的改变. π的这种行为是重子共振态和旁观者的遮蔽效应(再散射和再吸收)共同作用的结果.     

伏安法与补偿法测电阻的实验研究

文章用补偿法测量中电阻,并用Matlab计算软件处理了数据。数据结果显示,补偿法能很好地消除伏安法测电阻的系统误差,并且经过Matlab计算软件进行线性回归处理的结果相对误差要比未经处理的单组数据低一个数量级。     

Study of nuclear-coulomb interference effects in inelastic deuteron scattering on 238U

The angular distributions of elastically and inelastically scattered deuterons from ²³⁸U at E = 17 MeV are compared to coupled-channel calculations. The cross sections at small scattering angles are strongly influenced by nuclear-Coulomb interference effects and allow a simultaneous extraction of nuclear (optical potential) and charge quadrupole deformation parameters. Two different deformed Coulomb potentials and the parameters of the optical model are discussed.     

Experimental Study on Powder Flowability Using Vibration Shear Tube Method

The flowability of powders with different mass median diameters ranging from micrometers to nanometers was measured using the vibration shear tube method. In the measurement system used in this study, the powder was discharged through a narrow gap between a vibrating tube edge and a flat bottom surface, where each particle could experience high shear forces to overcome the adhesion and friction forces. The vibration amplitude was increased during the measurement, and the mass of particles discharged was measured at constant time intervals. From the relationship between the mass flow rate and the vibration acceleration, static and dynamic properties of the powders were evaluated using the critical vibration acceleration, characteristic mass flow rate, and gradient of mass flow rate. The correlation between the static and dynamic properties was studied in detail.