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A microscopic cluster model with a fully correlated Gaussian basis is developed. In the model, the stochastic variational method is used in order to calculate the ground-energy and the mean-square radius conveniently. Based on this model, the ground-energy level and radius of the neutron halo nucleus, 6He, are calculated as a α+n+n three-cluster model. The results are in good agreement with the experimental data. 相似文献
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The performance of a double sided silicon strip detector (DSSSD), which is used for the position and energy detection of heavy ions, is reported. The analysis shows that although the incomplete charge collection (ICC) and charge sharing (CS) effects of the DSSSD give rise to a loss of energy resolution, the position information is recorded without ambiguity. Representations of ICC/CS events in the energy spectra are shown and their origins are confirmed by correlation analysis of the spectra from both the junction side and ohmic side of the DSSSD. 相似文献
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楼建玲 李智焕 叶沿林 江栋兴 华辉 李湘庆 张双全 郑涛 葛愉成 孔赞 吕林辉 李琛 卢飞 范凤英 李忠宇 曹中鑫 马立英 Faisal 徐瑚珊 胡正国 王猛 雷相国 段利敏 肖志刚 黄天衡 付芬 章学恒 郑川 余玉洪 涂小林 张亚鹏 杨彦云 张宏斌 唐彬 田育林 欧阳珍 黄美容 徐治国 岳珂 高启 《中国物理 C》2008,32(Z2):41-43
The β-delayed neutron and γ spectra of neutron-rich nucleus 21N using β-γ and β-n coincidence measurements were presented in this paper. Thirteen new neutron groups ranging from 0.28 MeV to 4.98 MeV and with a total branching ratio 88.7±4.2% were observed. One γ transition among the excited states of 21O, and four γ transitions among the excited states of 20O were identified in the β decay chain of 21N. The ungated half-life of 83.8±2.1 ms was also determined for 21N. 相似文献
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孙立杰 徐新星 林承键 方德清 王建松 李智焕 王玉廷 李晶 杨磊 马南茹 王康 臧宏亮 王宏伟 李琛 施晨钟 聂茂武 李秀芳 李贺 马军兵 马朋 金仕纶 黄美容 白真 王建国 杨峰 贾会明 张焕乔 刘祖华 包鹏飞 王东玺 杨彦云 周远杰 马维虎 陈杰 马余刚 张玉虎 周小红 徐瑚珊 肖国青 《原子核物理评论》2017,34(3):431-436
15O(α,γ)19Ne(p,γ)20Na反应链是高温CNO循环向快速质子俘获过程突破的一条关键路径,相关的反应率输入量可通过20Mg的β衰变可布居19Ne共振态并测量其衰变性质来获得。通过高效率高精度地测量20Mg β衰变中产生的质子与γ射线得到了20Mg衰变的详细信息,并构建了完整的衰变纲图,还进行了19Ne 4 033 keV共振态衰变性质的探索,获得了该态在20Mg β衰变中被布居的分支比上限。通过比20Mg和20O镜像能级跃迁的结果确认了同位旋非对称性,为检验相关理论模型提供了精确的实验数据。对于突破路径中有重要影响的19Ne 4 033 keV共振态的性质,有待更高统计的实验进一步研究。The breakout from the hot CNO cycle to the rapid proton capture process can occur via the 15O(α,γ)19Ne(p,γ)20Na reaction sequence, and the β decay of 20Mg can be used as an alternative method to characterize some specific resonances, which will provide detailed nuclear structure input for reaction rate calculations. The reliable information on the decay properties and structure of 20Mg was obtained by measuring the emitted particles and γ-rays in the β decay with high efficiency and high resolution. Attempt was also made to search for the decay channels associated with the 4 033 keV resonance in 19Ne. To test fundamental symmetries, the transitions in the mirror decays of 20Mg and 20O were compared. The precise experimental data presented here would be important to constrain the theoretical calculations. It is desirable to clarify the astrophysically relevant problem by further experiments with improved statistics on the basis of the present work. 相似文献
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臧宏亮 叶沿林 李智焕 王建松 楼建玲 李奇特 葛愉成 杨晓菲 李晶 蒋伟 冯俊 刘强 杨彪 陈志强 刘洋 吴鸿毅 牛晨阳 李晨光 王春光 王翔 刘威 高见 余翰舟 马军兵 马朋 白真 杨彦云 金仕纶 卢飞 《中国物理C(英文版)》2018,42(7):074003-074003
An experiment for p(~(14)C,~(14)C~*→~(10)Be+α)p inelastic excitation and decay was performed in inverse kinematics at a beam energy of 25.3 Me V/u.A series of~(14)C excited states,including a new one at 18.3(1)Me V,were observed which decay to various states of the final nucleus of~(10)Be.A specially designed telescope system,installed around zero degrees,played an essential role in detecting the resonant states near theα-separation threshold.A state at 14.1(1)Me V is clearly identified,being consistent with the predicted band-head of the molecular rotational band characterized by theπ-bond linear chain configuration.Further clarification of the properties of this exotic state is suggested by using appropriate reaction tools. 相似文献
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段芳芳 杨彦云 庞丹阳 胡碧涛 王建松 王康 杨过 Valdir Guimar?es 马朋 许世伟 刘星泉 马军兵 白真 胡强 金树亚 孙欣欣 姚佳盛 齐航凯 孙志宇 《中国物理C(英文版)》2020,(2):72-79
Elastic scattering of 10Be on a 208Pb target was measured at ELab=127 MeV,which corresponds to three times the Coulomb barrier.The secondary 10Be beam was produced at the Radioactive Ion Beam Line in Lanzhou of the Heavy-Ion Research Facility in Lanzhou.The angular distribution of elastic scattering in the 10 Be+208Pb system shows a typical Fresnel diffraction peak.Optical model analysis of the angular distribution was performed using the Woods-Saxon,double-folding and global potentials.With the global potential,different density distributions were used.The results indicate that different density distributions for the projectile induce distinct effects in the angular distribution. 相似文献
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基于放射性核束物理的研究需求以及兰州重离子加速器国家实验室兰州放射性束流线(HIRFL-RIBLL1)的实际情况,本工作设计了一套高效率的带电粒子探测系统。该系统由6套探测模块组成,每套探测模块均为DSSD+PSD+CsI(T1)三层结构。利用Geant4模拟给出了整套探测系统的几何效率,得到了探测系统的最佳设计方案,之后模拟完成了Elab=125 MeV的7Be在208Pb靶上的弹性散射和破裂反应实验,并对模拟实验结果进行数据分析得到了弹性散射和破裂反应事件的统计分布。 相似文献
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