共查询到20条相似文献,搜索用时 15 毫秒
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Through measuring prompt γ-rays emitted in the spontaneous fission of 252Cf with higher statistic data,level structures in the neutron rich,odd A107Ru nucleus have been re investigated. New level scheme of 107Ru has been established. The ground state band was extended with spin up to 27 2h. The νh11/2 band structure observed in our previous publication has been confirmed and extended. These results clear up the inconsistence between our earlier work and results from another experiment published recently. A collective band built on (9/2-) level has been observed for the first time. Some important features of the level scheme have been discussed. 相似文献
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丁怀博 朱胜江J.H.Hamilton A.V.Ramayya J.K.Hwang Y.X.Luo J..Rasmussen I.Y.Lee车兴来 王建国徐强 《中国物理快报》2007,24(6):1517-1520
High spin states in the neutron-rich ^108Mo nucleus are studied by measuring prompt γ-rays following the spontaneous fission of 252Cf with a Gammasphere detector array. The ground-state band is confirmed, and the one-phonon γ-vibrational band is updated with spin up to 12h. A new collective band with the band head level at 1422.4keV is suggested as a two-phonon γ-vibrational band. Another new band is proposed as a two-quasi- proton excitation band. Systematic characteristics of the collective bands are discussed. 相似文献
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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
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Through measuring high-fold prompt γ- ray coincidence events following the spontaneous fission of 252 Cf with the Gammasphere detector array, new level scheme in the very neutron-rich odd-A 113Ru nucleus has been established. An intruder collective band based on 11/2- level has been identified with spin up to 31/2 k and excitation energy 3.6 MeV. This band most probably originates from vh11/2. intruder orbital. Another collective band probably built on 9/2- level is also observed. Some important characteristics of the collective bands have been systematically discussed. 相似文献
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Measurement of Angular Cross Correlation of the Cross Section Fluctuation in Dissipative Collision 27Al+27Al 下载免费PDF全文
The excitation function was measured from θlab=10.4° to 57.4° in dissipative collision 27Al+27Al with incident energy ranging from 114 to 123 MeV in step of 200 keV. The Angular-cross Correlation Functions (ACFs) of cross section fluctuation within large angle region were obtained through experiment for the first time. It is found that the angular coherent width is at least 40°. It is interesting that the ACFs is not simple bell shape but shows strong asymmetry. The over-all behavior is that ACF varies more quickly for the backward angles. Itis also noticed that the cross section fluctuation in the forward angle region (θcm<70°) shows much stronger angular coherence than in the backward angle region (θcm>70°). This angular dependence may be attributed to the coherent rotation effect of intermediate dinuclear system. 相似文献
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本文研究了中、重质量核的14MeV中子的(n,~3He)反应截面的系统学特性,在对实验数据分析,评价的基础上,给出了系统学的经验公式,计算了一批核素的反应截面,同实验值符合较好,并讨论了可能的反应机制。 The systematic characters of (n, ~3He) reaction cross sections have been studied formedium and heavy mass nucleus at 14MeV. A set of the empirital parameters have been eatracted onthe bases of analyzing and evaluating available data. The (n,~3He) reaction cross sections of somenuclei have been calculated, and a good agreement with the experimental data have been obtained.Most possible reaction mechanisms are also discussed. 相似文献
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庞丹阳叶沿林 郑涛李智焕 李湘庆葛愉成 华辉吴翠娥 楼建玲卢飞 范凤英A. Ozawa Y. Yamaguchi R. Kanungo D. Fang I.Tanihata 《中国物理快报》2007,24(10):2785-2788
The inclusive differential cross sections of the ^7 Li nucleus in a reaction induced by ^6He on a ^9Be target are measured at an incident energy of 25 MeV/nucleon. Finite-range distorted-wave Born approximation calculations suggest that these ^7 Li particles are formed in a direct single-proton pickup reaction ^9Be(^6He,^7 Li)^8Li. The experimental data can be well reproduced by taking into account of the contributions of both the ground states and the first excited states of ^7Li and ^8Li. 相似文献
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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
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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
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Cross Section Measurements of Neutron-Rich Hg Isotopes in Reaction of 28MeV/u 18O with Thick Natural Lead Target 下载免费PDF全文
By using 28MeV/u 18O beam,an on-line melting lead target equipment and 4π-ΔEβ-γcoincident technique,the relative cross section ratios and absolute cross sections of neutron-rich nuclides 205—208Hg have been measured. The production cross section of 209Hg is extrapolated.The cross section of 207Hg produced by-2p +1n from target decreases suddenly,which may be explained by change of reaction Q value. 相似文献
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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
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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
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PANG Dan-Yang YE Yan-Lin JIANG Dong-Xing ZHENG Tao LI Zhi-Huan LI Xiang-Qing GE Yu-Cheng WU Cui-E CHEN Zhi-Qiang HUA Hui ZHANG Gao-Long WANG Jia LOU Jian-Li 《中国物理C(英文版)》2006,30(1):22-25
Angular distributions for elastic transfer in the 6He+9Be system were measured at the incident 6He laboratory energy of E=150MeV. From a distorted-wave Born approximation (DWBA) analysis,3He spectroscopic amplitude in 9Be were extracted and compared with values obtained by shell model calculations. The result shows that the spectroscopic amplitude is much greater than 0.70. 相似文献
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LIU Xin WANG You-Bao LI Zhi-Hong JIN Sun-Jun WANG Bao-Xiang LI Yun-Ju LI Er-Tao BAI Xi-Xiang GUO Bing SU Jun ZENG Sheng YAN Sheng-Quan LIAN Gang HUANG Wu-Zhen LIU Wei-Ping 《中国物理C(英文版)》2012,36(8):716-720
The angular distribution of 1H(6He,p)6He elastic scattering has been measured at Ec.m.=4.3 MeV by using a thick-target inverse kinematic method. The experimental differential cross sections are reproduced by the distorted-wave Born approximation calculation utilizing the CH89 global optical potential parameter set. The real part of CH89 is reduced comparing with other potentials, which may be attributed to the couplings necessary for the weakly bound nuclei. 相似文献
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A parametrization of ^3He(7,p)2H cross section data at laboratory photon energies between 9 and 150MeV iscarried out with a simple phenomenological function. The differential cross section data are normalized to the total cross-section values which are consistent with the measurement from monochromatic photon beams. The obtained results give a good representation of the experimental points. 相似文献
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Charge radius and charge form factors of different charge density distributions for 6,8He are calculated with the relativistic Eikonal approximation. Detailed comparisons and discussions are presented. It is found that the charge form factors curves of 6,8He are much lower than the experimental ones of 4He. This is, in principle, consistent with the experimental fact. Whereas detailed comparison among the charge form factors which correspond to different charge distributions show significant deviations. This indicates that the effects of the correlations between the halo neutrons and the α-core in 6,8He with different charge density distributions are quite different. This result would provide a useful reference for the possible experiments on the next-generation electron-nucleus collider and for the tests of different theoretical models for the exotic nuclei 6,8He. 相似文献
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Charge Symmetry Breaking Effects in Elastic Nucleon Scattering From the 3H and 3He Mirror Nuclei 下载免费PDF全文
Using a microscopic momenteum space optical potential and the method for treating the Coulomb force, which is propose by R Crespo and J. A. Tostevin, we calculated the differential cross section of elastic nucleon scattering from the 3H and 3He mirror nuclei at 500MeV and the ratio of cross sections. The charge symmetry breaking effects due to the Coulomb force between the proton and nuclei are shown. 相似文献