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1.
The oscillatory structure appeared in the differential cross section of the reaction for 16O(16O, 12C)20Ne may be explained by particle transfer from covalent channel to ionic channel in the nuclear molecular orbital theory. 相似文献
2.
Measurement of Angular Distributions for Elastic Scattering of 16O+94Zr and 16O+116Sn Reactions
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HU GuiQing ZHAO Kui JIANG Hua GUO JiYu FU ChangBo LU XiuQin LIANG Gang LI ZhiChang LI ShuYuan LIU JianCheng 《中国物理C(英文版)》2000,24(8):725-731
The angular distributions for elatic scattering of the two systems,16O+94Zr at energies 52,57,59,62,72,82 and 92 MeV and 16O+116Sn at energies 57,59,62,67,72,82 and 92 MeV have been measured.The scattered ions were datected by the Beijing Q3D magnetic spectrometer and its heavy ion focal plane detector.The optical model analysis of the data was made with the Coupled Channels code ECIS, and the optical potential parameters have been obtained by fitting the data.Within the limited data,the phenomenon of the ‘threshold anomaly’is observed. 相似文献
3.
Angular distributions and differential range distributions have been measured with nuclear chemistry techniques for 20 target residues from the reactions of 115In with 92 and 71MeV 16O ions.In terms of the increase of impact parameter,the results indicate continuous evolution of the reaction mechanisms from complete fusion,incomplete fusion to direct reaction involving steadily decreasing transfer of mass and momentum.Contribution of incomplete fusion in 16O+115In reaction is significantly larger than that in 16O+65Cu reaction. 相似文献
4.
Some experimental results measured for light emission particles with Z≤2 from 12C+64Ni reaction at E(12C)=69, 56MeV are reported. A comparison between moving source model calculation and proton's spectra have been performed. Extracted parameters of the source with faster velocity are agreement with the systematic values found before. The composite particle energy spectra of α, 3He and D were analyzed by coalescence model. 相似文献
5.
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
6.
YAN De-Hong GUO Zhong-Yan WU En-Jiu YIN Shu-Zhi FAN En-Jie XI Hong-Fei LIU Guan-Hua ZHANG Qing-Li FENG En-Pu LU Xiu-Qin ZHAO Kui CHENG Ye-Hao LI Qing-Li LI Min JIANG Cheng-Lie 《中国物理C(英文版)》1991,15(2):158-164
The angular distributions and Wilczynski plots of emitted fragments from He to O in reaction of 16O+64Ni at 96MeV have been measured.The DIC cross section and intereaction time were obtained.DIC character of the reaction was discussed.The trace which shows that the emitted fragments of He and Li mainly come from the evaporation process of compound nuclei emerged. 相似文献
7.
Wang Sufang Zheng Jiwen Liu Guoxing Chen Keliang Bat Xingping Zheng Pingzi Zhang Huanqiao Xu Jincheng Liu Zuhua Ruan Ming LV Jun Xu Kan 《中国物理C(英文版)》1994,18(1):6-12
The complete fusion excitation function for the 16O+natS reaction has been measured in the range of 50-75 MeV with a step of 1.0MeV by using 1a position sensitive △E-E telescope system. The model parameters have been extracted from data analysis.The striking gross structure of the excitation function has been observed. The energies of peaks are at ECM=38,43 and 48 MeV respectively. 相似文献
8.
WANG DA-YAN LI ZU-YU YUAN SHUANG-GUI GUO ZHONG-YAN JIN GEN-MING XU GUO-JUN YUE HAI-KUI WANG XI-MING CHEN JU-SHENG ZENG WEN-BING XIE HONG-MEI QIAN ZHENG-GUANG ZHANG LI DAI GUANG-XI 《中国物理C(英文版)》1982,6(5):609-615
In this paper, we present energy spectra and angular distributions for the α-par-ticles emitted in the reaction of 12C+197Au at 64 and 67 MeV and for α, Be and B emittedin the reaction at 71.5 MeV. The most-probable energles of the variousproducts emittedin this reaction decrease.with decreasing incident energy. The angular distributions peak near grazing angle.The peak position of the angular distributions shift from--80°to--120°while the projec-tile energy decreases from 71.5 MeV to 64 MeV. These all show the features of the transferreaction. The 6Li product also has been measured and the 8Be particle emitted from thisreaction was detected at 90°to the beam direction using α-α coincident technique at 71.5MeV. The coross section of the 3Be is only few percent at the same angle. 相似文献
9.
INFLUENCE OF THE NEUTRON NUMBER OF TARGET NUCLEUS ON CROSS SECTIONS OF PARTICLES EMISSION IN 12C+112,124Sn
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The energy spectra and angular distributions of Li, Be, B particles emitted from the 12C+112Sn and 12C+124Sn reactions at EL=70.0MeV are measured. The angular distributions of the Li, Be, and B particles are found to be peaked around the grazing angle, without any forward peaked component.
The experimental results also showed that the cross section for emission is larger in 12C+112Sn reaction than that in 12C+124Sn reaction, in contrast with the cross sections for Li, Be and B emissions. The indicates the effect of the neutron number of the target nucleus on the emission probability. 相似文献
The experimental results also showed that the cross section for emission is larger in 12C+112Sn reaction than that in 12C+124Sn reaction, in contrast with the cross sections for Li, Be and B emissions. The indicates the effect of the neutron number of the target nucleus on the emission probability. 相似文献
10.
Produchon yields were determined for 25 abet fragments produced from the reaction of iron with 80 MeV/u 16O ions. From these data, charge distribution and mass yield distribution have been deduced. The experimental results are compared with those reported from our previous work. It is found that the width parameter σz and the most probable charge Zp of the charge distribution increase slowly with increasing bombarding energy. The mass yield distribution is discussed in terms of the concepts of limiting fragmentation and factorization. 相似文献
11.
SHEN Wen-Qing YIN Shu-Lan GUO Zhong-Yan ZHAN Wen-Long ZHU Yong-Tai JIN Gen-Ming QIAO Wei-Min WU En-Jiu JIANG Cheng-Lie 《中国物理C(英文版)》1985,9(3):332-340
The projectile-like fragments produced by 80.6MeV 16O on 27Al were measured using the large area position sensitive ionization chamber. The energy spectra, angular distributions, contour plots of d2σ/dΩdE in the E-θ plane of the reaction products from Li to Na and the Z-distribution were obtained. The cross sections of the quasi and deep inelastic scattering were introduced. A brief discussion of the experimental results is also given. 相似文献
12.
SHEN Wen-Qing ZHU Yong-Tai YIN Shu-Zhi GUO Zhong-Yan ZHAN Wen-Long JIN Gen-Ming QIAO Wei-Min WU En-Jiu JIANG Cheng-Lie 《中国物理C(英文版)》1985,9(5):611-617
The decreasing coefficients of the angular distributions, the charge distributions and the first and second moments of the charge distributions with variation of TKEL are deduced from the results of the measurement of projectile-like fragments produced by 80.6MeV 16O on 27Al. The relaxation process of this reaction is analysed, the effects of the potential energy surface on the first and recond moments of charge distributions are discussed. 相似文献
13.
FENG En-Pu WANG Qi ZHU Yong-Tai YIN Xu MIAO He-Bin SUN Shu-Ming LI Song-Lin WU Zhong-Li FAN Guo-Ying XIE Yuan-Xiang ZHAN Wen-Long 《中国物理C(英文版)》1986,10(3):323-329
By using ΔE-E telescope and the time of flight detector, the energy spectra of products between 6Li and 16O were measured for the reaction 12C+27Al, at 61.8MeV. The contour plots of differential cross section in c.m. system and the angular distributions of emitted fragments were obtained. The calculated values of fully relaxed energies in deep inelastic collistions agree with the experimental values. The mean interaction time of di-nuclear system was estimated as from 1×10-21s to 1.4×10-22s 相似文献
14.
In the framework of the eikonal form of DWIA and using the transition densitymethod, the differential cross sections for 13O (π,π') .18O* (2+, 1.98 MeV) inelasticscattering at Tπ=230 MeV are calculated. The ratios of the integrated cross sectionsfor π- vs. π+ bombardments, are analyzed and the effects of changing the neutron radiusto the differential cross sections are studied as well. Our results fit the data quite well. 相似文献
15.
LI Wen-Xin SUN Tong-Yu WU Ding-Qing JIN Gen-Ming SUN Ru-Lin LI Yun-Sheng ZHAO Li-Li WANG Su-Fang 《中国物理C(英文版)》1991,15(4):329-335
The excitation functions,angular distributions and differential range distributions have been measured for target residues from the reaction of 65Cu induced by 45—96MeV 16O ions with radiochemical techniques.A comparison of the experimental data with Monte-Carlo simulations based on the statistcal model of compound nucleus that the heavy residues are produced by the decay of a compound nucleus formed by complete fusion.Incomplete fusion or massive transfer are the main reaction mechnisms leading to production of the residues with mass number close to that of the target. 相似文献
16.
Yao Lishan 《中国物理C(英文版)》1997,21(8):740-744
The optical model of 16O is studied based on the dispetsion relation theory at neutron energy up to 20MeV.The total cross section anomaly is removed essendally at low energies for 16O. 相似文献
17.
Gao Chengqun 《中国物理C(英文版)》1997,21(6):530-534
The gross structure appeared in the total fusion cross section for 16O+12C system is studied by using the LCNO theory and the folding model of the paritydependent potential.The experimental data of the fusion cross section,elastic scattering excitation functions and angular distributions for this system are well explained. 相似文献
18.
Fission Fragment Angular Correlation in the Reaction Induced by 84.0MeV 16O Bombarded 238U
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QIAN Xing ZHANG Huan-Qiao LIU Zu-Hua XU Jin-Cheng CHEN Shao-Lin XU Kan LU Li-Xin 《中国物理C(英文版)》1993,17(2):173-178
Fission fragment angular distribution and angular correlation in the reaction induced by 84.0MeV 16O bombarded 238U have been measured by using two position-sensitive PPAC with large area.Transfer fission has been removed from total fission using fission fragment angular correlation technique.The contribution to the total fission cross section arising from transfer is about 10%.The anisotropy of fission fragment for transfer-fission is rather small,thus the removal of the transfer fission has little effect on the total fragment angular distribution.Indeed the anisotropy becomes larger by about 5% and anomalously anisotropies still persist. 相似文献
19.
The mechanism of transfering a cluster of nucleons between two colliding nuclei is considered to explain the backward angle oscillatory rise in the differential cross section of the elastic scattering between certain nuclei, such as 16O+24Mg or 20Ne+24Mg. The nuclear molecular orbit approximation theory is applied. For one-step transfer, if the parameter involved is assumed to be adjustable, the numerical calculations can be made to fit the experimental results naturally. 相似文献
20.
SUN Tong-Yu LI Wen-Xin WU Ding-Qing WANG Su-Fang XU Shu-Wei ZHAO Li-Li GUO Ying-Xiang SUN Xiu-Rong 《中国物理C(英文版)》1990,14(1):64-69
Excitation functions for the 21 products of the reaction induced by 16O on 115In have been determined in an energy region between 51 and 97MeV with nuclear chemistry techniques.The experimental results were compared with those calculated using Alice code and Monte-Carlo analogue. 相似文献