共查询到20条相似文献,搜索用时 15 毫秒
1.
本文研究了朝阳1号聚碳酸酯SSNTD记录~(238)U的特性。定出了~(238)U的实验射程。计算了~(238)U在此材料中的射程和限定能量损失率的能量关系。分析讨论了材料的响应范围及其对于重带电粒子的电荷分辨率和质量分辨率。 相似文献
2.
Strongly damped reactions of 238U+238U, at Ecm= 680—1880 MeV have been studied based on the improved quantum molecular dynamics model. We find that at a certain energy region the entrance channel potential is weakly repulsive and the dissipation is very strong after touching configuration, these two effects make the time delay of re-separation for colliding system. The single particle potential well of the transiently formed composite system has Coulomb barrier about 15—20 MeV high at the surface, which makes the excited unbound protons being still embedded in the potential well and moving in a common mono-single particle potential for a period of time and thus restrains from quick decay of the composite system. 相似文献
3.
核物理研究室核化学组 《中国物理 C》1978,2(4)
在12C离子引起的209Bi和238U的裂变中,用放射化学方法分别测量了15个和17个裂变产物的产额.根据这些数据,用三种电荷分布假设计算了裂变碎片的质量分布.计算表明,等电荷位移假设得到的结果一般和裂变碎片高斯质量分布曲线拟合得最好.比较了209Bi(12C,f),238U(12C,f)以及我们较早测量得到的(197Au(12C,f)的质量分布曲线,指出当裂变参数Z2/A>37时,质量分布宽度随Z2/A的增加而迅速增加. 相似文献
4.
本文报告了对朝阳1号聚碳酸酯固体核径迹探测器进行重离子标定的实验方法, 给出了六种蚀刻条件下比蚀刻速度V与限定能量损失率REL的关系曲线及经验公式. 相似文献
5.
本实验测量了238U(5.4MeV/u)轰击48Ca、45Sc靶和238U(6.0MeV/u)轰击16O、48Ca、45Sc、48Ti、58Fe、64Ni及89Y靶等10个反应系统的三体碎片符合出射道. 得到了跟随裂变截面、总动能损失、碎片动能和质量分布以及碎片在第一质心与第二质心的角分布等. 实验用了4片200mm×300mm的双维位敏雪崩计数器, 给出了关联的空间位置信息与飞行时间. 三体事件用运动学直接求解, 其中识别裂变对碎片是基于该对之间相对速度为2.4cm/ns的事实. 探测几何效率用蒙特卡罗模拟计算来确定. 实验表明, 跟随裂变源于准弹性散射, 其截面σS.F较大对于27Al靶, 为σS.F总截面的15%, 而89Y靶为70%. 同时发现, 对于幻核靶, σS.F与索末费尔得参数之间有简单的线性关系. 相似文献
6.
In order to check the conceptual design of the subcritical blanket in a fusion-fission hybrid reactor, a depleted uranium/polyethylene simulation device with alternate shells has been established. The measurement of the 238U(n, 2n) reaction rate was carried out using an activation technique, by measuring the 208 keVγ rays emitted from 237U. The self-absorption of depleted uranium foils with different thicknesses was experimentally corrected. The distribution of the 238U(n, 2n) reaction rate at 90° to the incident D+ beam was obtained, with uncertainty between 5.3% and 6.0%. The experiment was analyzed using MCNP5 code with the ENDF/BVI library, and the calculated results are all about 5% higher than the measured results. 相似文献
7.
16O(16O, 12C)20Ne反应微分截面中的振荡结构在核分子轨道理论框架下, 基于由共价道到离子道的α转移机制得到满意的解释. 相似文献
8.
9.
The prompt fission neutron spectra for the neutron-induced fission of 235U at En < 5 MeV are calculated using nuclear evaporation theory with a semi-empirical model, in which the nonconstant and constant temperatures related to the Fermi gas model are taken into account. The calculated prompt fission neutron spectra reproduce the experimental data well. For the n(thermal)+235U reaction, the average nuclear temperature of the fission fragment, and the probability distribution of the nuclear temperature, are discussed and compared with the Los Alamos model. The energy carried away by γ rays emitted from each fragment is also obtained and the results are in good agreement with the existing experimental data. 相似文献
10.
用790MeV136Xe轰击56Fe靶,测量了类靶碎片的质量数和原子序数。探测且鉴定了四个丰中子同位素54Ti,56V,57V,58Cr。同时提供了55Ti,58V,59Cr存在的可能性。使用西德重离子研究中心的磁谱仪和磁分析一起进行了飞行时间和ΔE-E测量,同位素鉴定是可靠的。 相似文献
11.
12.
13.
测量了50MeV的11B束在40Ar上的弹性散射角分布和单质子转移反应40Ar(11B, 10Be)41K的微分截面. 用光学模型拟合了弹性散射截面. 用包含反冲效应的精确有限程扭曲波玻恩近似(EFR-DWBA)分析了微分截面, 提取了谱因子. 相似文献
14.
The level schemes of neutron-rich nuclei,141Xe、152Ce、153Nd and 160Sm have been established for the first time through measuring the prompt γ-rays from spontaneous fission of 252Cf.The highest spin state is up to 16+.The collective band structures in these neutron-rich nuclei are discussed. 相似文献
15.
16.
17.
YU Yong XIE Yuan-Xiang XU Shu-Wei LI Zhan-Kui PAN Qiang-Yan WANG Chun-Fang XING Jian-Ping ZHANG Tian-Mei 《中国物理C(英文版)》2001,25(2):108-114
Isotopes,130Nd and 140Tb were produced using enriched targets 96Ru and 106Cd, respectively,bombarded by 36Ar ion beam. The two nuclides were identified and studied by a He-jet tape transport system in combination with "X-γ" and "γ-γ" coincidence measure- ments. The half-life of 130Nd was determined to be (13±2)s. The EC/β+ decay scheme of 130Nd was proposed for the first time, and the spins and parties of the ground-state and observed low-lying states in the daughter nucleus 130Pr were speculated tentatively. The previous simple EC/β+ decay scheme of 140Tb was revised, and the spin-parity of its groundstate was assigned to be 7+. 相似文献
18.
19.
20.
使用VMI模型计算156Er和162Er的转排角动量时, 发现一对核子拆对、转排时两核有不同性质的形状跃迁. 相似文献