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1.
Energy coherence widths of the dissipative products in the collision 27Al+27Al are extracted from measurement of the excitation functions. Then, the nuclear temperature T of the intermediate dinuclear system are determined, and discussed by using a concept of coherence rotation. 相似文献
2.
Interaction time ~4.3×10-21s of the dissipative products in the collision 27Al+27Al is extracted from the measurement of excitation functions by using the developed Ericson statistical theory. 相似文献
3.
4.
Analysis of the Energy Autocorrelation Functions in Dissipative Heavy Ion Collision of 27Al+27Al
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The excitation functions of the dissipative fragments emitted from the reaction of 27Al+27Al have been measured in the energy region from 114MeV to 127MeV in steps of 200keV. The detection system covered continuous angles from 10° to 57° in laboratory system. The energy autocorrelation functions of the dissipative fragments have been analyzed by using different approaches,especially using the statistical nuclear reaction model with memory. The results indicate that the intermediate dinuclear system formed in the dissipative process is set in a damped coherent nuclear rotation which causes the nonself averaging oscillation structure in the excitation functions and originates from a typical quantum chaotic motion. 相似文献
5.
Measurement of Excitation Function and Analysis of StatisticalProperty in 27Al+27Al mssipative Reaction
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The angular distribuhon in the range of 0cm=50°—90° and excitation funchon of the reachon products in heavy ion dissipahve reachon 27Al+27Al were measured, in the incident energy region from 114MeV to 120MeV with 200keV step. The statishcal property of the fluctuation of the excitation funchon in heavy ion dissipative reaction was discussed based on the integration of the macro outgoing channels. 相似文献
6.
Non-Reproducibility of the Cross Sections of the Products Induced from Dissipative Reaction of 17F+27Al
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HAN Jian-Long WANG Qi DONG Yu-Chuan LI Song-Lin DUAN Li-Min WU He-Yu XU Hua-Gen CHEN Ruo-Fu XU Hu-Shan BAI Zhen LI Zhi-Chang LU Xiu-Qin ZHAO Kui 《中国物理C(英文版)》2006,30(2):108-112
The differential cross sections of the dissipative products B, C, N, O, F, Ne, Na and Mg induced from the reactions of 19F+27Al at two incident energies have been measured at the HI-13 tandem accelerator, Beijing. In the case of a fixed beam incident energy 114MeV or 118.75MeV respectively, identical reaction system and the same detection system, 20 target points in steps of 2mm on a 10mm×50mm rectangular Al foil have been bombarded. The experimental results indicate that the probability distribution of the cross sections is much wider than a standard Gaussian distribution. This non-reproducibility of the cross sections can't be interpreted by the statistical property of a finite count rate. 相似文献
7.
Azimuthal Distribution and Azimuthal Correlation of the Particles in 10.6MeV/u 84Kr+27Al Collision
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The light charged particle emission in coincidence with fragmemts in 10.6MeV/u 84Kr+27Al collision is studied.Emphasis is laid on the characters of two-order anisotropy coefficient of Fourier expansion up to two order from fitting particle azimuthal distribution and particle-particle azimuthal correlation.The derived results prove that particle emission is statistically independent with the same azimuthal distribution in each event.It is found that two-order anisotropic coefficient depends weakly on the fragment mass and increases with increasing emitted particle mass. 相似文献
8.
The Cross Section Fluctuation of the Isotope Projectile-Like Fragments in the Dissipative Process of Reaction 19F+51V
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Wang Qi Lu Jun Xu Hushan Li Songlin Zhu Yongtai Yin Xu Fan Enjie Zhang Yuhu Li Zhichang Zhao Kui Lu Xiuqin Hu Xiaoqing 《中国物理C(英文版)》1996,20(4):289-296
By using a detection system combining Time-of-Flight(TOF)method with(△E-E)technique,the excitation functions,the dependence of energy coherence widthΓon product mass A and the dependence of Γon the degree of freedom of neutron excess N/Z for some elements and their isotope products in the dissipative process of reaction 19F+51V at energies from 102.25MeV to 109.50 MeV(in 250 keV steps)were presented and discussed for the first time. 相似文献
9.
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
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11.
Angular and Z Distributions of the Fragments at Forward and Intermediate Angles in the Reaction of 25MeV/u 40Ar+115In,58Ni,27Al
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WANG JinChuan ZHAN WenLong GUO ZhongYan XI HongFei LIU Hang ZHOU JianQun ZHAO YouXiong 《中国物理C(英文版)》2000,24(1):41-48
The angular & Z distributions of foe fragments emitted in the forward and intermediary angles are measured at the reaction of 25 MeV/u 40Ar+115In,58Ni,27Al. Their characteristics are investigated based on the model of Modified Qantum Molecular Dynamics (MQMD). Generally, the theoretical calculations are in good agreement with the experiment data. But in the forward angles the yield of the fragments is underestimated by MQMD model while in the case of the intermediate angle region, the calculation is higher than the experiment data in some degree for the fragments whose charge numbers are in the vicinity of the proiectile. The angular & charge distributions of the fragments are also compared with the statistical model of GEMINI. The results turn out to be that a small proportion of the statistical evaporation component exists in the forward angles while in the intermediate angle region, this component increases to some extent. However, its ratio is still small. It is found that the equilibrium evaporation component decreases gradually when the Z of the fragments becomes smaller. 相似文献
12.
WANG Qi TIAN Wen-Dong LI Song-Lin JIANG Zhong-He DONG Yu-Chuan LI Zhi-Chang LU Xiu-Qin ZHAO Kui FU Chang-Bo LIU Jian-Cheng JIANG Hua HU Gui-Qing 《中国物理C(英文版)》2002,26(2):141-147
Two independent measurements of excitation functions in the dissipative collisions of 19F+93Nb have been performed at incident energies from 100 to 108 MeV in steps of 250 keV. The two measurements differed by the thickness of the target foils, 70μg/cm2 and 71μg/cm2, respectively. All the other experimental conditions, the accelerator, the incident energies and steps, the scattering chamber, the detection system, the electronics, the acquisition system and all the parameters selected in the two measurements, were kept to be identical in both experiments. The data indicate non-reproducibility of the non-self averaging oscillating yields in the two independent measurements. The indication of the non-reproducibility of the cross sections is discussed. 相似文献
13.
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)》1981,5(3):364-371
Quasi-elastic and deep inelastic reactions of 71.5 MeV 12C ions on a 27Al target are measured, ΔE-E telescope is used to identify the reaction products. The energy spectra, angular distributions and contour products in the E-θ plane are obtained and discussed. 相似文献
14.
THE MEASUREMENT OF COMPLETE FUSION CROSS-SECTIONS FOR THE REACTIONS 12C+27Al, 12C+209Bi AND 14N+Pb
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Mica track detectors were used for the measurement of evaporation residues and fission fragments of compound nuclei formed in 12C+27Al, 12C+209Bi and 14N+Pb reactions. The complete fusion cross-sections and excitation functions were then obtained. By using the sharp cut-off model approximation, the values of the critical angular momenta were extracted from the complete fusion cross-sections. The results obtained were compared with the calculations based on current theories for critical angular momentum; they were found to agree within experimental uncertainties. 相似文献
15.
Lu Jun Wang Qi Xu Hushan Li Songlin Zhu Yongtai Yin Xu Fan Enjie Zhang Yuhu Li Zhichang Zhao Kui Lu Xiuqin Hu Xiaoqing 《中国物理C(英文版)》1997,21(1):15-20
Excitation function fluctuations for projectile-like fragments from 19F+51V dissipative reaction within the energy region of 102.25—109.50MeV are reported.The statistical method is applied to the analysis of energy coherence in the cross rection fluctuations and the strong cross correlation between exit channels is obtained.The dependences on charge number and on mass number are presented.The relation between angular velocity damping and the rotational energy dissipation is discussed. 相似文献
16.
Non-reproducibility of the Cross Sections Measured in the Dissipative Collisions of 19F+93Nb
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WANG Qi TIAN WenDong LI SongLin JIANG ZhongHe LI ZhiChang LU XiuQin ZHAO Kui FU ChangBo LIU JianCheng JIANG Hua HU GuiQing 《中国物理C(英文版)》2000,24(11):1060-1065
Two independent measurements of excitation functions for the 19F+93Nb dissipative heavy ion collisions have been performed at incident energies from 100 to 108 MeV in steps of 250 keV. The two measurements differed by two target foils, 70 and 71μg/cm2, respectively. All the other experimental conditions were kept to be identical in hath experiments. The data indicate nonreptaludbility of the non-self-averaging oscillating yields in the two measurements. This supports recent theoretical predictions of extreme sensitivity and chaos in complex quantum collisions. 相似文献
17.
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
18.
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
19.
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
20.
Effect of Rotational Degree of Freedom on the Enhanced Prescission Particle Emission in 10.6MeV/u 84Kr+27Al Reaction
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YE Wei 《中国物理C(英文版)》2002,26(1):52-57
Effect of the rotational degree of freedom of In nucleus in three dimension space on prescission particle emission in 10.6MeV/u and 8.5MeV/u 84Kr+27Al collisions was studied in the framework of a statistical model. The calculation results show that for the latter incident energy,particle emission is insensitive to the rotational degree of freedom,while for the former one,the incorporation of this factor leads to the reduction of the extracted fission delay time from 20×10-21s to 7.5×10-21s,indicating the existence of this effect. The result also demonstrates that this effect is unable to completely account for the experimental data. In addition,the effect of rotational degree of freedom on particle evaporation prior to scission was found to depend on the excitation energy. 相似文献