28 research outputs found
一个硬表方式的多参数数据获取与分析系统
在大参数量实验的数据获取中,事例判选和非相关数据排零必须解决的问题,LIST方式把大量参数中相关的数据路集中成组,相应的预先生成分组的CNAF命令表,每次触发时并不读出所有的数据路,而是只读出与触发信号直接关联的几组参数,HARDWARE LIST方式采用硬件实现以上功能,提高了数据获取速度。本文介绍我们研制的一个HARDWARE LIST方式的数据获取与分析系统。硬件的关键部件是CAMAC多机箱控制器和单总线适配器-MFI-9,它同时采用了前端缓存和双向DNA机制。软件完成获取驱动,基本的在线分析和在线监视,提供简单明了的用户接口,设计时保证了系统的完整性,模块的独立性和易扩展
聚羧酸盐与磺酸盐分散剂的复配及其在农药水分散粒剂中的应用研究
分散剂在农药水分散粒剂(WDG)制备中具有重要的作用,研究了聚羧酸盐分散剂SD-819和磺酸盐分散剂SD-661的复配对WDG性能的影响。通过测定分散剂的表面张力和WDG的悬浮率等物化参数,发现复配分散剂制备WDG的悬浮率和崩解性等性能优于单一分散剂;同时考察了2种最优配比(3:6和4:3)的复配分散剂制备的WDG,结果表明Zeta电位和表面张力对制剂悬浮率等性能有重要的影响。</p
~(20)Naβ延迟α衰变研究的新结果
以25及35.5MeV质子轰击氖靶,对20Na的β延迟α衰变作了重新研究.实验中使用了以气体电离室作为ΔE探测器的新型粒子望远镜系统,在所测带电粒子谱的0.695MeV及0.907MeV处,首次观察到两个新峰.根据粒子鉴别、分支比和寿命测量,确信它们是来自20Na的低能β延迟α衰变,由此修改了20Na的衰变纲图和低激发态纲图,并讨论了它在天体物理研究中的意义.The β-delayed α decay of 20Na was restudied using neon target bombarded by 25 and 35.5 MeV protons.In this experiment a newly developed particle-telescope system including a gas ionization chamber as a thin ΔE detector was used. Two new peaks,one at 0.695 MeV and other at 0.907 MeV, were observed for the first time in the charged particle spectra. Based on particle identification, branching ratio and life time measurement,it is believed that these new peaks result fromβdelayed low energy αdecay of 20Na国家自然科学基金,中国科学院“八五”重大课
元素分离样品中丰中子同位素弱γ活性探测
MPGeγ探测器的γ能量信号与4πEβ探测器的β射线能损信号符合后再与BGO探测的β+衰变的正电子湮灭511keVγ信号作反符合组成一种新的探测系统。该系统可使γ谱测量的康普顿本底下降约一个数量级。对缺中子同位素衰变γ射线的探测作强抑制的同时,丰中子同位素衰变γ射线的探测仍能保持相对单谱为(46±3)%的高效率。使用该系统对已被合成的丰中子核素208Hg的半寿命进行了一次新的测定。所得新的208Hg半寿命测定值41.5+min,与以往用放射化学母牛法给出的结果一致,测量误差有较大改进。A new detection system was constructed by means of combination of a coincidence and an anticoincidence. The γ-ray energy signals detected by a HPGe detector were in coincidence with energy-loss signals of β rays detected by a 4 detector, then the coincidence output were in anticoincidence with the positron-annihilating 511 keV signals detected by a large BGO detector. This system may reduces the Compote background for spectrum measurement by about one order of magnitude. With strong suppression to the...国家自然科学基金,中国科学院“八五”重大课题资
新同位素~(175)Er
简介首次合成新核素174Er及对其衰变纲图测定的实验方法和实验结果.the synthesis and γ decay scheme of new isotope175Er is reported for the first time.The related experimental process and main results are represented briefly also.中国科学院八五重大项目,国家自然科学基
Synthesis of 2-(Alkylthio)-1,2,4-triazolo[1,5-a]pyrimidines and 3-(Alkythio)-1,2,4-triazolo[3,4-a]pyrimidines and Their Vasodilator Activity
氖的高离化态离子激发光谱和能级寿命测量
采用束箔技术研究47MeV能量的氖离子和不同材料、不同厚度的C箔(39μg/cm~2)和Al箔(3.4mg/cm~2)相互作用,产生高离化态的类H(Ne X)、类He(NeⅨ)、类Li(Ne Ⅷ)、类Be(Ne Ⅶ)等少电子离子,并测量了这些离子的激发光谱和能级寿命.国家自然科学基
首次建立缺中子核素~(209)Fr的分支比很弱的(EC+β~+)衰变纲图
用16O束轰击197Au靶,通过熔合蒸发4n反应产生了209Fr,借助于氦喷嘴带传输系统对其衰变性质进行了研究.由-t,X--t,--t符合及-延迟符合测量得到的结果,首次建立了209Fr的(EC+β+)衰变纲图.它包含了20条射线.209Rn的5个低位态的成员可以用[(210Rn2+)(νf5/2)-1]多重态结构来解释.实验估计209Fr(EC+β+)衰变的分支比为(3.0±1.5)%.Fr has been produced by irradiation of 197 Au with 16 O from SFC accelarator uia the fusion evaporation 4n channel.The (EC+β +)decay of 209 Fr has been studied by a He jet tape transport system.The decay scheme is proposed for the first time based on -t,X--t,--t coincidece and - delay coincidence measurements,which takes account of 20 observed ray.Five members of low lying states in 209 Rn can be explained by the multiplet [( 210 Rn 2 +)(νf 5/2 ) -...中国科学院和国家自然科学基
~(175)Er的衰变纲图
用14MeV中子照射天然Yb靶,通过176Yb(n,2p)175Er反应产生了新的重丰中子同位素175Er,借助X-γ,γ-γ符合测量方法,首次鉴别出了175Er,并测得其半衰期为(1.2±0.3)min.同时还观察到了175Er衰变所发射的8条新γ射线,建立了175Er的部分γ衰变纲图,从中指定了175Tm的一个基态转动带.The 175Er activity was produced via the reaction 176Yb(n, 2p) 175Er by 14MeVneutron irradiation of a natural ytterbium metal target with a thickness of ~ 80mg /cm2.X-γ and γ-γ coincidence measurements were employed to identify 175Er activity.The half-life of 175Er has been determined to be (1.2±0.3)min. Eight new gamma rayswere assigned to the decay of 175Er. A partial decay scheme of 175Er has been proposed for the first time, from which a ground rotational band has been assigned to175Tm.国家自然科学基金,中国科学院八五重大项
新缺中子同位素~(235)Am的分离和鉴别
新缺中子同位素235Am的分离和鉴别杨维凡郭俊盛牟万统甘再国方克明石立军刘洪业郭天瑞沈水法袁双贵张学谦秦芝马瑞昌钟纪泉(中国科学院近代物理研究所)王书鸿孔登明乔际民(中国科学院高能物理研究所)关键词缺中子同位素反冲传输装置化学分离半衰期1952年美...国家自然科学基金,中国科学院的双重资