排序方式: 共有75条查询结果,搜索用时 15 毫秒
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张立勇 许世伟 何建军 H. Yamaguchi S. Kubono Y. Wakabayashi 陈思泽 胡钧 马朋 Y. Togano T. Hashimoto D. Kahl T. Teranishi 陈若富 王宏伟 田文栋 郭冰 S. Hayakawa N. Iwasa T. Yamada T. Komatsubara 《原子核物理评论》2013,30(4):385-390
在X 射线暴高温高密度的环境中,18Ne( α, p)21Na 很可能是由热CNO 循环突破到rp 过程的一个重要反应。到目前为止,人们测得的反应率还存在很大的不确定性。实验中用CRIB(CNS RadioactiveIon Beam separator) 提供的21Na 放射性束轰击8.8 mg/cm2 的聚乙烯厚靶,利用放置在θlab = 14°,0°,14° 处的3 套硅条探测器望远镜阵列对反冲轻粒子进行鉴别和测量,测得在一段能区(Ex = 5:5 9:2MeV) 内21Na(p, p)21Na 的激发函数。通过对21Na(p, p) 共振弹性散射截面进行R矩阵拟合,得到了22Mg共振能级的自旋宇称以及质子宽度等信息,从而为计算18Ne( α,, p)21Na 反应率提供了实验参数。The 18Ne(α ,p)21Na reaction is thought to be one of the key breakout reaction from the hot CNO cycle to the rp-process in X-ray bursts. Over stellartemperatures achieved in XRBs, this rate has not been sufficiently determined.The experiment was performed using CRIB (CNS Radioactive Ion Beam separator) at the Center for Nuclear Study (CNS) of the University of Tokyo. An 89 MeV 21Na radioactive ion beam was produced and bombarded an 8.8 mg/cm2 thick polyethylene target. The recoiled light particles were detected with three Micron silicon ΔE-E telescopes centered at angles of θlab = 0°; +14° and 14°with respect to the beam direction, respectively. The 21Na+p elastic-scattering excitation functions were reconstructed with a thick-target method over energies Ex = 5:5 9:2 MeV. The resonance parameters have been determined through an R-matrix analysis,which will be used to evaluate the 18Ne( α, p)21Na reaction rate. 相似文献
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在高压反应釜中进行了神木烟煤与CO2吸收剂CaO混合物的蒸汽气化反应,实现了在一个反应器内直接制甲烷的工艺。典型工况下气态产物中甲烷含量(体积分数)占62.28%,氢气占25.05%,一氧化碳和二氧化碳含量均低于0.1%,验证了煤直接制甲烷反应的可行性。实验研究了温度,压力,钙碳摩尔比[Ca]/[C],以及水碳摩尔比[H2O]/[C]的变化对反应产物及碳转化率的影响。结果表明降低反应温度和提高反应压力有利于甲烷的产生,[Ca]/[C]=0.5和[H2O]/[C]=1时具有良好的制甲烷效果。 相似文献
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The isoscaling behavior in the reaction system of 58,64Ni+9Be has been studied by using the heavy-ion phase-space exploration(HIPSE) model. The extracted isoscaling parameters α and β for both heavy and light fragments for HIPSE model calculations are in good agreement with recent experimental data. The investigation shows that the parameters in the HIPSE model have some effect on the isoscaling parameter. The isoscaling parameters for hot and cold fragments have been extracted. 相似文献
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Some experimental techniques and theoretical analysis on unbound nuclei structure study are briefly introduced in this article. The unbound nuclei structure investigation can inspect the reliability of theoretical calculation, and is also important to extend the modern nuclear structure model to exotic nuclear regions. With the recent development of radioactive Ion Beam (RIB) facility and some new experimental methods, the structure of unbound nuclei near drip line can be studied in experiment. 相似文献
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We investigate the applicability of the independent atom model (IAM) to elastic electron scattering from complex polyatomic molecules, namely C4H10 and C6H6, in the energy range 100-1000eV. The cross sections of the elastic electron scattering are calculated by employing the IAM together with the relativistic partial waves. The incorporation of both the modified absorption potential and the extended structural factor in the IAM makes the elastic differential cross sections and momentum transfer cross sections have a good agreement with the available experimental data. The present simple model seems to be insensitive to the complexity of the target molecules so that the proposed procedure can be quite useful for calculation of electron scattering from bio-molecules. 相似文献
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介绍了原子核高K同质异能态潜在的应用价值及国内外研究的进展。 总结了形成同质异能态的3种主要物理机制。 说明了高K同质异能态的应用原理是将其激发到更高的不稳定的K混合态上, 再发生诱发退激, 形成γ瀑, 释放其存储的能量。 同时又介绍了K混合态的3种主要产生机制。 最后分析了178Hfm2诱发退变的实验, 讨论了这些实验的区别和与角动量投影壳模型计算结果的差异。The nuclear isomer states have great potential value of application. The important experimental and theoretical researches are presented here. There are three kinds of physics mechanism for the formation of the isomer states. The principle of releasing the energy stored in the isomer is to excite it to higher states, K mixing states, which can spontaneously decay to the ground state forming the γ cascade. After introducting the three ways to form the K mixing states, we analyzed experiments on the most prospective isomer 178Hfm2, discussed the key differences between these experiments and suggested that the Projected Shell Model (PSM) can be helpful to confirm the occurrence of the K mixing states and would work out characteristics of the induced decay. 相似文献