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1.
The design and performance of a Micromegas with a resistive anode are presented in this paper. A thin resistive sheet with volume resistivity of 1012 Ω·m cm is glued onto the readout electrode surface and its performance is investigated by using a 55Fe X-ray radioactive source in the operation gas of argon and isobutene mixtures (Ar/Iso=95/5). The gas gain at different mesh high voltage, counting rate and working time are given. Energy spectra at different working voltages are measured and the results are discussed. We have oberved that a Micromegas with a resistive anode can be operated at higer gain than a standard Micromegas without sparks. 相似文献
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In this paper, the limitations of the common method measuring intrinsic spatial resolution of the GEM imaging detector are presented. Through theoretical analysis and experimental verification, we have improved the common method to avoid these limitations. Using these improved methods, a more precise measurement of intrinsic spatial resolutions are obtained. 相似文献
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A readout electronics system used for space cosmic-ray charge measurement for multi-channel silicon detectors is introduced in this paper, including performance measurements. A 64-channel charge sensitive ASIC (VA140) from the IDEAS company is used. With its features of low power consumption, low noise, large dynamic range, and high integration, it can be used in future particle detecting experiments based on silicon detectors. 相似文献
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CsI(Tl)晶体探测器APD读出的温度效应 总被引:1,自引:0,他引:1
对中国科学院近代物理研究所自行生长的铊激活碘化铯闪烁晶体CsI(Tl)光输出及Hamamtsu公司生产的S8664-1010型雪崩光二极管(APD)增益对温度的依赖关系做了系统研究. 结果表明, CsI(Tl)晶体光产额在室温范围内随着温度的增加而增加, 在-2℃—8℃温度范围内的平均温度系数为0.67%/℃, 在8℃—25℃温度范围内的平均温度系数为0.33%/℃. 而对所使用的APD, 其增益在室温范围内的温度系数为-3.68%℃(工作电压400V). APD结合CsI(Tl)晶体在室温下对137Cs的662keV γ射线的能量分辨可达5.1%. 相似文献
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王猛 胡正国 徐瑚珊 孙志宇 王建松 肖国青 詹文龙 张雪荧 李琛 毛瑞士 张宏斌 赵铁成 徐治国 王玥 陈若富 黄天衡 高辉 贾飞 付芬 高启 韩建龙 章学恒 郑川 余玉洪 樊瑞睿 李波 郭忠言 《中国物理 C》2008,32(7)
The reaction cross section of ~(17)B on ~(12)C target at(43.7±2.4)MeV/u has been measured at the Radioactive Ion Beam Line in Lanzhou(RIBLL).The root-mean-square matter radius(R_(rms))was deduced to be(2.92±0.10)fm,while the R_(rms)of the core and the valence neutron distribution are 2.28 fm and 5.98 fm respectively.Assuming a"core plus 2n"structure in ~(17)B,the mixed configuration of(2s_(1/2))and(1d_(1/2))of the valence neutrons is studied and the s-wave spectroscopic factor is found to be(80±21)%. 相似文献
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Bulk工艺气体微网探测器的研究 总被引:1,自引:0,他引:1
In this paper, we present a study of a micromegas detector prototype built with bulk technology. Following a short discussion of the micromegas detector's structure and working mechanism, the bulk fabrication process is described, and some testing results of the prototype are presented. 相似文献
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利用热释电晶体实现了一个X射线激发源,并以此激发源和高能量分辨率的硅漂移探测器构建了一个X射线荧光分析谱仪。首先通过分析计算热释电晶体厚度和靶厚度对产生X射线的影响选定了激发源的设计参数;然后测量了激发源发射的X射线本底,其能量范围在1~27 keV,包含有Cu和Ta的特征X射线,最大强度在每秒3 000个计数以上,对本底的测量同时显示出谱仪的探测器部分对Cu的8.05 keV特征峰的分辨率达到210 eV,具有很高的能量分辨率;最后使用该谱仪测试了Fe,Ti和Cr等三种单质样品和高钛玄武岩样品,测试结果表明该谱仪可以有效的分析出样品的元素成分。由于这种X射线荧光分析谱仪的各组成部分体积都很小,进一步便携化后非常适合于非破坏、现场和快速的元素分析场合。 相似文献
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胡正国 王猛 徐瑚珊 孙志宇 王建松 肖国青 詹文龙 肖志刚 毛瑞士 张宏斌 赵铁成 徐治国 王玥 陈若富 黄天衡 高辉 贾飞 付芬 高启 韩建龙 章学恒 郑川 余玉洪 樊瑞睿 李波 郭忠言 《物理学报》2008,57(5):2866-2870
在兰州重离子加速器国家实验室(HIRFL)放射性次级束流线(RIBLL)上,用束流透射法测量了丰中子奇异核17B与C靶反应的总截面.假定17B具有15B(核芯)+2n结构,采用Gauss+HO形式的密度分布和零力程Glauber模型进行计算的结果可以很好地拟合实验数据,并得出17B的密度分布有一个很大的弥散,表明17B是双中子晕核.
关键词:
丰中子奇异核
反应总截面
Glauber模型
密度分布 相似文献
10.
Property measurement of the CsI(Tl) crystal prepared at IMP 总被引:2,自引:0,他引:2
Large-sized CsI(Tl) single crystals, ~φ100mm×350mm, have been grown successfully, and this CsI(Tl) coupled with PD has been successfully utilized at RIBLL (the Radioactive Ion Beam Line in Lanzhou) to measure the energy of heavy ions as a stopping detector.
The performances of CsI(Tl) detector coupled with PD and APD have been
tested and compared, including the temperature dependence of scintillating light yield. 相似文献