共查询到20条相似文献,搜索用时 31 毫秒
1.
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
2.
We have measured the reaction cross section σR of 17C on the carbon target at the intermediate energy of 97A MeV by using transmission method.finite-range Glauber model has been employed to investigate the density distribution of 17C by fitting the present result and the previous result of interaction cross section σI.By contrast with the result from the analysis of σI,a tail in the neutron density distribution of 17C is found necessary to interpret the present result.Considering the configuration of the valence neutron,a dominant 1d5/2(77±21%)occupancy is found,which is in agreement with results of momentum distribution measurements. 相似文献
3.
4.
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
5.
LI Er-Tao LI Zhi-Hong LI Yun-Ju YAN Sheng-Quan BAI Xi-Xiang GUOBing SU Jun WANG You-Bao WANG Bao-Xiang LIAN Gang ZENGSheng FANG Xiao ZHAO Wei-Juan LIU Wei-Ping 《中国物理快报》2009,26(7)
Angular distribution of the 12C(6He,7Li)11B transfer reaction is measured with a secondary 6He beam of 36.4MeV for the first time. The experimental angular distribution is well reproduced by the distorted-wave Born approximation (DWBA) calculation. The success of the present experiment shows that it is feasible to measure one-nucleon transfer reaction on a light nucleus target with the secondary beam facility of the HI-13 tandem accelerator at China Institute of Atomic Energy (CIAE), Beijing. 相似文献
6.
By means of using an isospin-dependent Boltzmann-Langevin equation which includes isospin-dependent symmetry energy, Coulomb energy, isospin-dependent nucleon-nucleon cross sections, Pauli blocking, and initialization, the radial expansion flow of reaction systems 40Ca+58Ni and 40Ca+58Fe at 53, 100, 150, and 200 MeV/u in the central collisions were studied. It has shown that the more neutron rich system exhibits smaller radial expansion flow. It was found that the neutron rich system had smaller threshold energy which may provide a new method to determine the isospin dependent nuclear equation of state from calculated result and linear fitting result. 相似文献
7.
Ren Zhongzhou 《中国物理C(英文版)》1995,19(6):562-566
Based on the three-body model with Yukawa interactions,the halo nuclei 11Li,14Be and 17B are further studied by the variation calculation.An analytical expression for the density distribution of the halo neutron is given.The theoretical resultsagree with the recent experimental data. 相似文献
8.
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
9.
XIAO Zhi-Gang WU He-Yu LI Zu-Yu JIN Gen-Ming WANG Hong-Wei DUAN Li-Min ZHANG Bao-Guo HU Rong-Jiang WEI Zhi-Yong LIU Yong-Ying WANG Su-Fang LU Zhao-Hui ZHU Yong-Tai ZHU Hai-Dong 《中国物理C(英文版)》2001,25(6):494-499
Isotope ratios,defined as the yield ratio of two isotopes with the same charge,were analyzed as a function of kinetic energy of outgoing particles at 20° in the reactions of 40Ar+112,124Sn and 5°in36Ar+112,124Sn at incident energy of 35MeV/u. Isotope ratios between the neutron-deficient isotopes and stable isotope increase with kinetic energy,while those between the neutron rich isotopes and stable isotope decrease. This different behavior was observed similar for both 112Sn and 124Sn targets. The isotope ratios show rather obvious target dependence at 20° and little target dependence at 5°. As the outgoing energy getting down,the N/Z ratio of the fragmentation products at 5° diverts gradually from the N/Z ratio of the projectile to that of the system. These observations indicate that the isospin degree of freedom does not reach complete equilibrium in the peripheral or semi-peripheral collision at this bombarding energy. 相似文献
10.
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
11.
Light Particle and Complex Fragments Emission from 12C Induced Reactions on 58Ni,64Ni at E/A=46.2MeV
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YIN Shu-Zhi ZHAN Wen-Long ZHU Yong-Tai GUO Zhong-Yan FENG En-Pu XI Hong-Fei ZHOU Jian-Qun LIU Guan-Hua 《中国物理C(英文版)》1992,16(4):364-369
Energy spectra of light charged particles and complex fragments emitted in the interaction of 46.2MeV/u 12C with different target 58Ni,64Ni,12C,197Au and 209Bi have been measured by telescopes,consisting of CsI(Tl) and surface barrier detector stacks.These telescopes for light charged particles and complex fragments have good energy resolution and mass identification.The inclusive data have been analysed within a moving source parametrization.The complex fragment yields from different targets have been compared at several angles.The systematic variation of deduced isotope yields ratios with different reaction systems is used to detemine the N/Z degree of freedom equilibration of the system achieved. 相似文献
12.
Zhang Xueqian Yuan Shuanggui Yang Weifan Mou Wantong Yu Xian Li Zongwei Guo Tianrui Du Yifei Luo Yixiao 《中国物理C(英文版)》1996,20(8):673-677
The 175Er activity was produced via the reaction 176Yb(n,2p) 175Er by 14MeV neutron irradiation of a natural ytterbium metal target with a thickness of~80mg/cm2.X-γ and γ-γ coincidence measurements were employed to identify 175Er activity.The half-life of 175Er has been determined to be (1.2±0.3)min. Eight new gamma rays were assigned to the decay of 175Er. A partial decay scheme of 175Er has been proposed for the first time, from which a ground rotational band has been assigned to 175Tm. 相似文献
13.
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
14.
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
15.
Measurements of Reaction Cross Section for F Isotopes and Possible Proton Skin Structure for 17F
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ZHANG Hu-Yong SHEN Wen-Qing MA Yu-Gang CAI Xiang-Zhou FANG De-Qing ZHONG Chen YU Li-Ping ZHAN Wen-Long GUO Zhong-Yan XIAO Guo-Qing WANG Jian-Song WANG Jin-Chuan 《中国物理C(英文版)》2002,26(1):35-39
The reaction cross sections σ R of F isotopes on carbon target were measured at intermediate energies via the transmission method. It was found that the reaction cross section of 17F has a little enhancement compared with that of its neighbor isotopes. The difference factor d has been deduced from the measured σ R by using the BUU model and Glauber model. It is enhanced also for 17F compared with its neighbor isotopes. From the above analysis, a possible proton skin structure is suggested for 17F. 相似文献
16.
The Angular Distributions of intermediate Mass Fragments Emittsd in 30 MeV/u 40Ar+58,64Ni and 115In Reactions
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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
17.
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
18.
DETERMINATION OF THE AVERAGE NEUTRON ENERGY USING CROSS SECTION RATIO OF 58Ni(n,p)58m+gCo and 58Ni(n,2n)57Ni REACTIONS
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YUAN Jun-Qian WANG Yong-Chang QIU Jiu-Zi WANG Hua-Min REN Zhong-Liang YANG Jing-Kang 《中国物理C(英文版)》1990,14(6):569-572
The method of determination for average neutron energy from D-T reaction by using two silicon semiconductor detectors and the cross section ratios of 58Ni(n,p)58m+gCo and 58Ni(n,2n)57Ni reactions is described.The plot of the cross section ratio against the neutron energy has been obtained.The results have been compared with existing data. 相似文献
19.
YUAN Shuang-Gui ZHANG Tian-Mei PAN Qiang-Yan ZHANG Xue-Qian XU Shu-Wei 《中国物理C(英文版)》1992,16(8):765-766
New neutron-rich nuclide 185Hf has been identified for the first time.The 185Hf was produced via the 186W(n,2p)185Hf reaction by 14MeV neutron irradiation of natural metallic tungsten powder and separated by radiochemical methods.The identification of 185Hf was based on the observation of decay γ-ray of its daughter 185Ta.A half-life of 3.5±0.6min was determined for 185Hf by fitting the measured growth and decay curve of the 177.59keV γ-ray which is the strongest decay γ-ray of 185Ta.In addition,a new γ-ray of 164.5±0.5keV was found and assigned to 185Hf. 相似文献
20.
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