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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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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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基于GEANT4模拟了HIRFL CSRm内靶实验终端的CsI(Tl)电磁量能器系统,给出了CsI电磁量能器的最佳设计参数及可能达到的性能.结果表明,设计的CsI(Tl)电磁量能器系统能够满足所研究的物理要求. Based on the GEANT4, the performance of the electromagnetic calorimeter (EMC) of the internal-target detector at HIRFL-CSRm is simulated. The simulation results show that 1.5%—3% of the energy resolution σ_E/E and 2° of the polar angular resolution σ_θ can be obtained. The invariant mass of the π~0 decay can be reconstructed well. The performance can meet the requirement of studying the proposed physics at HIRFL-CSRm. 相似文献
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以硼氢化钠为还原剂化学镀镍的电化学研究 总被引:1,自引:0,他引:1
采用线性电位扫描伏安法研究了以硼氢化钠为还原剂的化学镀镍体系, 考查了镀液组成及工艺条件对化学镀镍硼阴、阳极过程的影响, 结果表明: 乙酸镍和硼氢化钠含量的提高分别促进了Ni2+的还原反应和BH4-的氧化反应; 乙二胺、氢氧化钠以及添加剂硫脲、糖精钠对阴、阳极反应均有不同程度的抑制作用, 同时添加剂中的硫元素加速了镍的氧化; 升高温度有利于阴、阳极反应的进行. 相似文献
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Experiment ^18Ne+^197 Au was performed in Heavy Ion Research Facility Radioactive Ion Beam Line at Lanzhou (RIBLL). The nuclear energy levels of ^18Ne were built by complete kinematical reconstruction of the decay products and diproton decay were observed from ^18Ne excited states. At 6.15 MeV, the experimental relative momentum and angular correlations of the emitted protons are given. The obvious enhancement at |qrol|= 23 MeV/c and θc.m. = 40° shows the experimental criterion of ^2He cluster decay from ^18Ne^q. 相似文献
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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
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Elastic scattering angular distributions of the 14^N+16^O system and the angular distributions of transfer reaction 16^O(14^N,13^C)17^F at ELab=76.2 MeV and 57 MeV have been measured and calculated by means of the exact finiterange distorted-wave Born approximation with the PTOLEMY code. The optical potential parameters for the weakly bound nuclear system 17^F+13^C have been deduced and applied to analyse the elastic scattering angular distributions of the similar systems 17^F+12^C and 17^F+14^N which are taken from literature. The result shows that the transfer reaction with stable projectile and target combination can be used as an alternative method to extract the optical potential parameters for the weakly bound nuclear system. 相似文献