89Ru的β缓发质子衰变性质

藉助氦喷嘴带传输系统,采用"p-γ"符合的鉴别原理,成功地合成与鉴别了58Ni(36Ar, 2p3n)反应产生的核素89Ru, 并研究了它的β缓发质子衰变性质.实验给出89Ru的衰变半衰期为(1.2±0.2) s, 测定了它的β缓发质子能谱,提取出了89Ru经缓发质子衰变布居到子核88Mo的2+和4+态的相对终态分支比(100∶6).通过与统计模型计算结果进行对比,初步指定了89Ru基态的自旋-宇称(5/2+或7/2±)和质量过剩(-59.5 MeV).     

一种近距离无线电能传输装置的设计与实现

本文设计并制作了一套近距离无线电能传输装置,通过该装置可以对15CM以内的电子器件进行电力传输。     

Synthesis, Characterization and Properties of Tri-substitute Potassium Salt of Trinitrophloroglucinol

The title complex [K3（TNPG）·（H2O）2]n was synthesized by the reaction of the aqueous solutions of trinitrophlomglucinol （TNPG） with KHCO3. The complex was characterized by elemental analysis and FTIR spectroscopy, and its single crystal structure was determined by X-ray diffraction analysis. The structural analysis demonstrates that two different coordination modes of K cations [K（1） and K（2）] are around TNPG^3- anions in complex [Ka（TNPG）·（H2O）2]n, where the coordination numbers are eight. All K atoms coordinate with O atoms of phenolic hydroxyl group and nitro-group simultaneously. The thermolysis of the [Ka（TNPG） · （H2O）2]n has been investigated by using differential scanning calorimetry （DSC） and thermogravimetry-derivative thermogravimetry （TG-DTG） at a heating rate of 10 ℃/min. The thermal decomposition processes of the title complex were comprised of one endothermic dehydration stage and one exothermic decomposition stage in 270-320℃, and the final decomposition residue contained KNC. Impact and friction sensitivity results of the complex revealed its sensitive nature towards mechanical stimuli. The experiments verified that the complex has some characteristics of explosive.     

89Ru的β缓发质子衰变性质

藉助氦喷嘴带传输系统,采用“p-γ”符合的鉴别原理,成功地合成与鉴别了⁵⁸Ni(³⁶Ar, 2p3n)反应产生的核素⁸⁹Ru,并研究了它的β缓发质子衰变性质.实验给出⁸⁹Ru的衰变半衰期为(1.2±0.2)s, 测定了它的β缓发质子能谱,提取出了⁸⁹Ru经缓发质子衰变布居到子核⁸⁸Mo的2⁺和4⁺态的相对终态分支比(100∶6).通过与统计模型计算结果进行对比,初步指定了⁸⁹Ru基态的自旋 宇称(5/2⁺或7/2^±)和质量过剩(-59.5 MeV).     

动力学光度法测定碳酰肼产品的纯度

基于碳酰肼与孔雀石绿反应生成无色物质,建立了简单、快速、准确的动力学光度法测定碳酰肼产品纯度的方法。测定了表观反应速率常数,并对反应机理进行研究,该方法测定范围为4×10-3~50×10-3mol.L-1,方法检出限为1.0×10-3mol.L-1。     

β-delayed proton decay of the proton drip-line nucleus 142Ho in the rare-earth region

New β-delayed proton precursor 142Ho was produced via heavy ion induced reaction 106Cd(40Ca, p3n), and identified for the first time by using a He-jet fast tape transport system in combination with "p-γ" coincidence measurements. The β-delayed proton decay of 142Ho was observed and its half life was determined to be (0.4±0.1) s. By fitting the experimental relative branching ratios to final states in the proton daughter nucleus 141Tb and the energy spectrum of β-delayed protons with a statistical model calculation, the ground-state spin of 142Ho was assigned as 5, 6 or 7. Nuclear energy-potential-surface (EPS) calculations were performed using the Woods-Saxon Strutinsky method. The calculated results favored the assignments of 7- to 142Ho. AS the by-products, some γ-transitions in the proton daughter nuclei following the β-delayed proton decays of precursors 139Gd, 140Tb, 142Tb, and 143Dy were reported here for the first time.     

稀土区质子滴线核142Ho的β 缓发质子衰变

通过重离子引起的核反应¹⁰⁶Cd (⁴⁰Ca, p3n)合成了新的β 缓发质子先驱核¹⁴²Ho, 并且配合氦喷嘴快速带传输系统用“p-γ”符合方法对它进行了首次鉴别. 观测了¹⁴²Ho的β 缓发质子衰变, 测定其半衰期为(0.4±0.1) s. 利用统计模型拟合实验估计的对质子女儿核¹⁴¹Tb中末态的相对分支比和缓发质子能谱, ¹⁴²Ho的基态自旋被指认为5, 6或7. 用Woods-Xason Strutinsky方法计算了¹⁴²Ho的核位能面, 其结果支持指认¹⁴²Ho的基态自旋宇称为7-. 作为副产品, 还首次观测到了来自先驱核¹³⁹Gd, ¹⁴⁰Tb, ¹⁴²Tb和¹⁴³Dy的β 缓发质子衰变产生的质子女儿核中的一些γ 跃迁.     

合成和研究稀土区质子滴线附近的6种新核素

利用兰州重离子加速装置(HIRFL)的SFC加速器引出的能量为165—180MeV的³⁶Ar重离子束,分别轰击⁹²Mo、⁹⁶Ru和¹⁰⁶Cd缺中子同位位素靶,产生了稀土区质子滴线附近的新核素¹²⁵Nd、¹²⁸Pm、¹²⁹Sm、¹³⁷Gd、¹³⁹Dy和¹³⁹Tb.借助高灵敏度的氦喷嘴快速带传输系统和“p–γ”或“X–γ”符合测量方法对它们进行了分离鉴别,确定它们的半衰期分别为(0.60±0.15)s,(1.0±0.3)s,(0.55±0.10)s,(2.2±0.2)s,(0.6±0.2)s和(1.6±0.2)s,并测量了¹²⁵Nd、¹²⁸Pm、¹²⁹Sm、¹³⁷Gd和¹³⁹Dy的β延发质子能谱,指认了能量为109.0和119.7keV的两条γ射线属于¹³⁹Tb的EC/β+衰变.     

3，5-二羟基-2，4，6-三硝基苯酚铷的晶体结构和热行为

0IntroductionSom e nitrogen鄄rich alkaline and alkali鄄earth m et鄄als com pounds of polynitro hydroxybenzenes can beused environm entally friendly prim ary explosives[1￣5].2,4,6鄄Trinitro鄄1,3,5鄄trihydroxybenzene(trinitrophloroglu鄄cinol,TNPG)belongs to a polynitro hydroxybenzeneand has been used in chem icalindustry as an ingredi鄄entfor prim ing com position,percussion caps and deto鄄nator form ulations[6].Therefore,in recent years,ithasbeen exploited to prepare a num ber of salts of ba…     

用分光光度法测量碳酰肼及孔雀石绿与碳酰肼的缩合反应动力学

用分光光度法研究了(15.0～22.0) ℃温度区间，水溶液中孔雀石绿和碳酰肼的缩合反应动力学。结果表明：此反应为二级反应，对于反应物分别为一级反应，离子强度在(0.2～1.0) mol·L^-1内对该反应产生负盐效应。提出了孔雀石绿和碳酰肼的反应机理。据此机理导出的速率方程与实验结果相吻合。在此基础上提出了测量碳酰肼浓度范围在(0.02～0.5)×10^-3 mol·L^-1的分光光度法。