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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.
Gao Chengqun 《中国物理C(英文版)》1997,21(8):751-756
Based on the potential resonance in heavy-ion collisions and on the optical model,the gross resonant structure appeared in the complete fusion excitation function and the phenomenon of the backward-angle oscillatory rise in the elastic scattering angular distribution for 16O+24Mg system are studied by using a deep opdcal potendal.The calculated results of the opdcal model are compared with those of the nuclear molecular orbital model.The origin of the gross resonant structure is discussed. 相似文献
3.
Using the method of Green's function and partial summation of multiple scattering,we have investigated in various approximations the contribution of 2p-1h multiple scattering correlaion to the low energy spectrum of 17O and 15O,respectively.In our calculation,the nuclear force employed is the paris potential and the energy dependence of G matrices has been taken into account rigorously.The numerical results agree with the experimental data reasonably well. 相似文献
4.
Measurement of Angular Distributions for Elastic Scattering of 16O+94Zr and 16O+116Sn Reactions 下载免费PDF全文
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
5.
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
6.
7.
Three-body exit channel in the reaction 12C+16O at 56MeV has been studied by using measurement of the coincidence between the two changed particles.The projected spectra of the coinsidence between the two α-particles shows that the channel α+24Mg is the main intermediate process of three-body exit channel α1+α2+20Ne in the reaction 12C+16O at 56MeV.The analysis of theoretical calculation showed that the sum of sequential decay and statistical break-up fit the experimental spectra satisfactorily. 相似文献
8.
THE COMPETITION BETWEEN TRANSFER AND FRAGMENTATION PROCESSES IN 20Ne (14.7,19.2MeV/u) INDUCED REACTION 下载免费PDF全文
ZHU Yong-Tai HU Xiao-Qing SHEN Wen-Qing LI Song-Lin ZHAN Wen-Long ZHANG Zhen ZHU Xiang 《中国物理C(英文版)》1990,14(2):184-187
Inclusive momentum spectra of projectile-like fragments are decomposed to several components including a fragmentation contribution and a transfer contribution in the 20Ne(14.7,19.2MeV/u) induced reaction.The competition between these two reaction mechanisms with increasing beam energy is studied. 相似文献
9.
Using Glauber theory including the nucleon spin effects,the proton-4He elastic scattering differential cross section and polarization at energies in the region 0.35—23.1 GeV are calculated.The results show that,after including the spin-flip terms,we can explain the differential cross section data and describe qualitatively the polarization. 相似文献
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11.
WU ZHONG-LI ZHU YONG-TAI XIA GUO—ZHONG LIU Bu-SHENG LI FA-WEI FAN GUO-YING 《中国物理C(英文版)》1979,3(2):244-246
The deep inelastic scattering of 71.5 12C ions on a 27Al target was measured.ΔE-E telescope was used to identify the reaction products.The contour plots in the E-θ plane for the measured cross sections in the C.M.S.for B and Be show the generalfeatures of quasi-elastic scattering at grazing angles and the deep inelastic scatteringridge extending from smaller angles and flattening at larger ones.Two special featuresmay be worthwhile to mention.First,there are some fine structures near the Q.E.peak.Secondly,the average C.M.kinetic energy of the completely damped part is notequal to the Coulomb energy of the final state. 相似文献
12.
The pre-scission neutrons measured in the reactions 16O+181Ta and 19F+178Hf are studied via a Langevin equation coupled with a statistical decay model. We find that because of the mass asymmetry of different entrance channels, the spin distributions of compound nuclei would be different, consequently, the measured neutrons in these two reactions would also different. This means that the entrance channel will affect the particle emission in the fission process of hot nuclei. 相似文献
13.
The low-lying levels of 18O and 18F have been calculated using several Skyrme interactions and the many-body folded diagram theory of Kuo, Lee and Ratcliff. Our results obtained with the Skyrme interactions determined by Vautherin and Brink and by Krewald are not in satisfactory agreement with the experimental spectra. 相似文献
14.
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
15.
The quasi-elastic scattering excitation function of the doubly magic ^16O+^208 Pb system at a backward angle is measured at sub-barrier energies with high precision. The diffuseness parameters extracted from both the singlechannel and the coupled-channels calculations give almost the same value a = 0.76 ± 0.04 fro. The results show that the coupling effect is negligible for the spherical system. The obtained value is smaller than the extracted value from the fusion excitation function, but larger than the value of a -- 0.63 fm, which is from the systematic analysis of elastic scattering data. 相似文献
16.
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
17.
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
18.
In this paper,the basic features exhibited by 20Ne+12C system are analyzed and the excitation functions and the angular distributions of the 20Ne+12C elastic scattering are well reproduced on the basis of the nuclear molecular orbital theory.The results show that the double-alpha transfer effect for a deep optical potential is responsible for the above difference in the elastic scattering excitation functions between these two systems. 相似文献
19.
本文从靶粒子在弹性散射中所获得的速度入手,直接计算靶粒子所获得的动能,从而较《大学物理》1990年第4期上“关于两粒子弹性散射中功能的转移”一文更直观地求得了功能的转移关系。 相似文献
20.
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