共查询到20条相似文献,搜索用时 31 毫秒
1.
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
2.
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
3.
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
4.
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
5.
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
6.
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
7.
The Angular Distributions of intermediate Mass Fragments Emittsd in 30 MeV/u 40Ar+58,64Ni and 115In Reactions 下载免费PDF全文
Gou Quanbu Zhu Yongtai Xu Hushan Wei Zhiyong Lu Jun Zhang Yuhu Wang Qi Li Songlin Wu Zhongli 《中国物理C(英文版)》1999,23(4):328-333
The angular distributions of intermediate mass fragments with Z=3-19 emitted in 30 MeV/u 40Ar+58,64Ni and 115In reactions over an angular range of 5°—140°have been measured.Exponential distribution function: dσ/dΩ=N·exp(-θ/a) was used tO fit the measured angular distributions.We have extracted the decay factor a that can be connected with the interaction time τ, and the factor N that is related to the intensity of the emission source.The relationships of a(Z) with Z and N(Z) with Z for different reaction systems and different angular ranges have been discussed. The dependence of angular distributions on isospin and the symmetry of reaction system have also been discussed. 相似文献
8.
WU Xiu-Kun LIN Cheng-Jian YANG Feng LIU Zu-Hua ZHANG Huan-Qiao ZHANG Chun-Lei ZHOU Ping 《中国物理C(英文版)》2006,30(2):105-107
Quasi-elastic cross sections have been measured for 32S+90,96Zr with high accuracy near the Coulomb barrier at backward angles and the barrier distributions are extracted from them. We find that barrier distribution of 32S+96Zr is flat and extends to low energies. The sub-barrier fusion cross sections are strongly enhanced because of such barrier distribution. Compared with the reaction of 32S+90Zr, 32S+96Zr has stronger neutron transfers up to the six-neutron pickup, which is due to the positive Q values of neutron transfers in the latter. This indicates that the neutron transfer may play a role in the enhancement of sub-barrier fusion for 32S+96Zr. 相似文献
9.
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
10.
ZHAO Kai LI Zhu-Xia WU Xi-Zhen WANG Ning ZHANG Ying-Xun TIAN Jun-Long ZHANG Huan-Qiao LIU Zu-Hua 《中国物理C(英文版)》2006,30(1):26-31
Based on the Improved Quantum Molecular Dynamics Model the fusion reactions of 40,48Ca+90,96Zr are studied by making a more rigorous treatment of the initial condition. The study shows that:(1) the calculated fusion cross sections for all four reactions of 40,48Ca+90,96Zr are in good agreement with experiment data; (2) the sub-barrier fusion for the neutron-rich reaction 40Ca+96Zr is ubstantially enhanced as compared with the other three reactions. In order to understand the reason why the sub-barrier fusion of the neutron-rich reaction 40Ca+96Zr is enhanced as compared with the non-neutron-rich reaction 40Ca+96Zr and that of the neutron-rich reaction 48Ca+96Zr is not enhanced, the further investigations are carried out, those are: the dynamic fusion barriers for four reactions, the relation between dynamic fusion barrier and nucleon transfer and the relation between nucleon transfer and corresponding reaction Q value. It has been found that positive Q value leads to the strong nucleon transfer which reduces the dynamic fusion barrier and enhances the sub-barrier fusion cross section. 相似文献
11.
Complete fusion cross sections have been measured for 12C+159Tb and 12C+165Ho reactions by using K-X rays of evaporation residues with Si(Li)spectrometer.The half-lives of evaporation residues and its yield distributions as a function of incident energy have also been obtained.The experimental values for the complete fusion cross section were compared with the theoretical ones. 相似文献
12.
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
13.
Intermediate mass fragments(2Z≤11) emitted from 294 MeV 20Ne+159Tb reaction have been measured by △E-E telescope counters at the angle of 10°—150°region.The energy spectra of the fragments at back angle(>90°) have bell shape,and their peaks locate near the Coulomb barrier of exit channel.The analysis of the energy spectra has been done in terms of moving source and indicate that all the fragments are emitted from a common source,the compound nuclei formed in incomplete fusion process.The charge and angular distributions of the fragments originated from the asymmetric binary decay of the formed compound nuclei have been calculated based on statistical GEMINI code,and the results are in well agreement with the experimental data. 相似文献
14.
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
15.
Optical Potential Parameters for Halo Nucleus System ^6He+^12C from Transfer Reaction ^11B(^7Li, ^6He)^12C 下载免费PDF全文
The optical potential parameters for the halo nucleus system ^6He+^12C are extracted from fits to the measured angular distributions of ^11B(^7Li, ^6He)12C reaction at energies of 18.3 and 28.3MeV with distorted-wave Born approximation analysis. The characters of the obtained optical potentiM parameters are basically consistent with the results extracted from the fits to the elastic-scattering angular distributions in the literature. 相似文献
16.
Liu Zuhua Xu Jincheng Zhang Huanqiao Qian Xing Qiao Yu Lin Chengjian Xu Kan 《中国物理C(英文版)》1994,18(6):489-495
We have succeeded in isolating the complete arising from complete fusion-fission in terms of the fragment folding angle technique,and measured complete fusion-fission cross sections and fragment angular distributions for the 16O+232Th system in the center-of-mass energies between 72.61 and 80.11 MeV.The observed fission excitation function is in quite good agreement with the expectation of the coupled-channels theory.However,the measured fragment angular distributions are more anisotropic than the predictions of both the saddle-point transition-state model and scission model. 相似文献
17.
18.
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
19.
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
20.
Element Distributions of Intermediate Mass Fragments Emitted in 30 MeV/u 40Ar+58,64Ni and 115In Reactions 下载免费PDF全文
Gou Quanbu Zhu Yongtai Xu Hushan Wei Zhiyong Lu Jun Zhang Yuhu Wang Qi Li Songlin Wu Zhongli 《中国物理C(英文版)》1999,23(6):512-517
The element distribuhons of intermediate mass fragments (IMF) emitted over an angular region of 5°—140° have been measured in the reachons of 30MeV/u 40Ar+58,64Ni and 115In. Within 20°—80° range the IMFs with Z=3-24 were observed. The IMF production cross section changes smoothly with its charge number,and the element distribuhon changes continuously when the IMF charge number increases across the charge number of the projectile. There is no strong dependence of the element distribution on the charge number of the projectile in this angular region.The transition nature of the reaction mechanism in the intermediate energy region and the power law of the IMF element distribution,as well as the dependence of element distributions on the threshold of the detectors were discussed. 相似文献