共查询到18条相似文献,搜索用时 78 毫秒
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丰中子核6He在28Si靶上的反应总截面测量 总被引:1,自引:0,他引:1
实验测量了20—40MeV u的轻丰中子核6He在Si靶上的反应总截面,并且结合6He的高能实验数据,采用双参数HO密度分布形式用Glauber模型计算得到较好的拟合.与Warner的实验数据比较,反应总截面数据系统性好,并与能量有明显的依赖关系. Total reaction cross section (σt) was measured for neuton rich nuclei 6He on 28Si target from about 20 to 40 MeV/u and compared with Warner s experimental data. It is found that the total cross section of 6He on 28Si depends on the energy and it can be fitted well by Glauber model using two term HO density distribution from high energy data of 6He. 相似文献
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总结了兰州放射性束实验小组在兰州放射性次级束流线上近几年来利用产生的放射性束流,轰击Si或C等靶子,测量它的反应总截面.并利用经验公式将这些结果归一到相同的能量和靶子,与其相邻的核相比较,发现了9C,11Be,14Be,8B,14B 和12N等核素的反应总截面值有奇异增大的现象.利用微观的Glauber模型进行了计算,对有奇异结构的核采用核芯加价核子的密度分布形式,理论计算和实验结果符合得很好,可以给出奇异核的弥散的密度分布. 相似文献
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在RIKEN-RIPS上测量了23Al等丰质子核素的核反应总截面(σR)和平行动量分布(P//). 观察到了23Al核反应总截面的增强, 与以前的实验结果相符. 同时得到了23Al等丰质子核素擦掉一个质子后的P//. 在Few-body Glauber模型下对实验结果进行了讨论. P//的宽度显示23Al基态的外层质子处于d态, 这与g因子测量实验结果一致. 为了同时解释P//和σR的实验测量结果, 我们认为23Al可能有核芯增大的现象. 相似文献
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在三体模型的基础上,采用汤川作用势,进行变分计算,进一步研究了晕核11Li,14Be和17B的基态性质,给出了晕中子密度分布的一个解析表达式.理论计算结果与最新的实验数据一致. 相似文献
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丁怀博 朱胜江 J.H.Hamilton A.V.Ramayya J.K.Hwang Y.X.Luo J.O.Rasmussen I.Y.Lee 车兴来 陈永静 李明亮 《中国物理 C》2006,30(Z2):172-174
通过对重核252Cf自发裂变产生的瞬发γ谱的测量, 对丰中子核105Mo的能级结构进行了研究. 除确认与扩展了基带转动带外, 新识别了3个转动带, 它们分别被指定为建立在Nilsson能级3/2+[411], 1/2+[411]和5/2+[413]轨道上的单中子激发带, 并对这些集体带的特性进行了讨论. 相似文献
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ZhengGuo Hu Meng Wang HuShan Xu ZhiYu Sun JianSong Wang GuoQing Xiao WenLong Zhan ZhiGang Xiao RuiShi Mao Chen Li XueYing Zhang HongBin Zhang TieCheng Zhao ZhiGuo Xu Yue Wang RuoFu Chen TianHeng Huang Fen Fu Qi Gao JianLong Han XueHeng Zhang Chuan Zheng YuHong Yu ZhongYan Guo 《中国科学G辑(英文版)》2008,51(7):781-787
The total reaction cross section (1724 ± 93 mb) of 17B at the energy of 43.7 A MeV on C target has been measured by using the transmission method at the Radioactive Ion Beam Line
in Lanzhou (RIBLL). Assuming 17B consists of a core 15B plus two halo neutrons, the total cross section of 17B on C target was calculated with the zero-range Glauber model, where double Gaussian density distributions and Gaussian plus
HO density distributions were used. It can fit the experimental data very well. The characteristic of halo structure for 17B was found with a large diffusion of the neutrons density distribution.
Supported by the National Natural Science Foundation of China (Grant Nos. 10475098, 10605033 and 10221003), the Chinese Academy
of Sciences (Grant Nos. CXTD-J2005-1 and KJCX2-SW-N18), and Hundred Talent Project of CAS (Grant No. 0501080BR0) 相似文献
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用透射法测量了能量为79AMeV的17C在12C反应靶上的反应截面;利用有限力程Glauber模型对17C的密度分布进行了分析.由高能区(965AMeV)相互作用截面数据分析认为17C具有谐振子密度分布,但拟合本实验结果及高能区实验数据发现,17C的中子密度分布中存在一个尾巴;假设17C密度为芯核加单粒子密度分布形式,分析认为17C的价中子主要处于1d5/2?轨道. 相似文献
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Reaction and interaction cross sections of 17C on a carbon target have been re-analyzed using the modified Glauber model. The analysis with a deformed Woods-Saxon density/potential suggests a big deformation structure for 17C. The existence of a tail in the density distribution supports the possibility of it being a one-neutron halo structure. Under a deformed core plus a single-particle assumption, analysis shows a dominant d-wave of the valence neutron in 17C. 相似文献
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Fragmentation of stable and neutron-rich 12-16C into boron fragments at approximately 240 MeV/nucleon 下载免费PDF全文
The elemental fragmentation cross sections of boron fragments produced by stable and neutron-rich12-16C beams with a carbon target were systematically measured at an incident beam energy of approximately 240 MeV/nucleon.The measured cross sections were found to increase as the projectile mass number increases.The observed feature is explained qualitatively based on the abrasion-ablation two-stage reaction model and is compared quantitatively with predictions from various reaction models,including empirical and statistical models.All models agree with the measured cross sections within a factor of 2. 相似文献
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Reaction and interaction cross sections of 17C on a carbon target have been re-analyzed using the modified Glauber model. The analysis with a deformed Woods-Saxon density/potential suggests a big deformation structure for 17C. The existence of a tail in the density distribution supports the possibility of it being a one-neutron halo structure. Under a deformed core plus a single-particle assumption, analysis shows a dominant d-wave of the valence neutron in 17C. 相似文献
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The mirror nuclei ^12N and ^12B are separated by the Radioactive Ion Beam Line in Lanzhou (RIBLL) at HIRFL from the breakup of 78.6 MeV/u 14N on a Be target. The total reaction cross-sections of ^12N at 34.9 MeV/u and ^12B at 54.4 MeV/u on a Si target have been measured by using the transmission method. Assuming ^12N consists of a ^11C core plus one halo proton, the excitation function of ^12N and ^12B on a Si target and a C target were calculated with the Glanber model. It can fit the experimental data very well. The characteristic halo structure for ^12N was found with a large diffusion of the protons density distribution. 相似文献
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The mirror nuclei 12N and 12B are separated by the Radioactive Ion Beam Line in Lanzhou(RIBLL) at HIRFL from the breakup of 78.6 MeV/u 14N on a Be target.The total reaction cross-sections of 12N at 34.9 MeV/u and 12B at 54.4 MeV/u on a Si target have been measured by using the transmission method.Assuming 12N consists of a 11C core plus one halo proton,the excitation function of 12N and 12B on a Si target and a C target were calculated with the Glauber model.It can fit the experimental data very well.The ch... 相似文献
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在日本理化学研究所的放射性束流线上用透射法测量了能量为79 MeV/u的17C在12C反应靶上的反应截面;利用有限力程Glauber模型对17C的密度分布进行了分析. 同时拟合本实验结果及高能区的实验数据发现, 17C的中子密度分布中存在一个尾巴. 基于芯核加单粒子密度分布的假设,认为17C的价中子主要处于1d5/2轨道. We have measured the reaction cross section of 17C on a 12C target at 79 MeV/u using the transmission method. Together with previous data at high energy, we deduced the density distribution of 17C by fitting the experimental data using the finite range Glauber model. The analysis shows that a simple harmonic oscillator (HO) density is not adequate to explain consistently the present experimental data and the one at high energy simultaneously. To get a better fit of both the data, the existence of a tail in the density distribution of 17C is proposed. Based on the assumption of a core plus a single neutron, it is found that the valence neutron of 17C is mostly in the d orbital. This is in agreement with the conclusion from the measured momentum distribution. 相似文献