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The Cross-Section Measurements and Evaluations for 58Ni(n,p),60Ni(n,p),62Ni(n,α) and 54Fe(n,p) Reactions
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LI Ting-Yan SHI Zhao-Min LU Han-Lin ZHAO Wen-Rong YU Wei-Xiang YUAN Xia-Lin 《中国物理C(英文版)》1992,16(2):151-160
Activation techniques have been used to measure the cross-section for 58Ni(n,p),60Ni(n,p) and 62Ni(n,α) reactions in the neutron energy range 13.6—17.8MeV.The uncertainty of measured data has been aculated from 3%—7%.The covariance matrixes for measurement error are calculated.Evaluations for 58Ni(n,p),60Ni(n,p),62Ni(n,α) and 54Fe(n,p) crpss-section are made. 相似文献
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THE CROSS-SECTION MEASUREMENTS FOR 59Co(n,p)59Fe,59Co(n,α)56Mn AND 59Co(n,2n)58Co REACTIONS
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LI Ting-Yan SHI Zhao-Min LU Han-Lin ZHAO Wen-Rong YU Wei-Xiang YUAN Xia-Lin 《中国物理C(英文版)》1990,14(6):542-550
The cross sections of 59Co(n,p)59Fe,59Co(n,α)56Mn AND 59Co(n,2n)58Co reactions have been measured at neutron energy region of 12.8MeV—17.8MeV by activation method.The coveriance matrix of measured errors was calculated,and the comparison between the values of measured and calculated using theory model was made.The evaluated excitation functions for the three reactions are given. 相似文献
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The Cross Section Measurements for the 100Mo(n2n)99Mo,96Mo(n,p)96Nb and 92Mo(n,α)89m+gZr Reactions
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KONG Xiang-Zhong WANG Yong-Chang YUAN Jun-Qian YANG Jing-Kang WANG Xue-Zhi WANG Jing 《中国物理C(英文版)》1991,15(6):549-555
The cross sections for 100Mo(n2n)99Mo,96Mo(n,p)96Nb and 92Mo(n,α)89m+gZr have been measured by using the activation method relative to the cross sections of 27Al(n,α)24Na in the neutron energy range 13.40—14.79MeV.The comparison between the values of measured and calculated using theory mode was made.The evaluated excition functions for the three reactions are given. 相似文献
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用790MeV136Xe轰击56Fe靶,测量了类靶碎片的质量数和原子序数。探测且鉴定了四个丰中子同位素54Ti,56V,57V,58Cr。同时提供了55Ti,58V,59Cr存在的可能性。使用西德重离子研究中心的磁谱仪和磁分析一起进行了飞行时间和ΔE-E测量,同位素鉴定是可靠的。 相似文献
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Spectra and angular distributions of the(α,d)reactions on 56Fe 57Fe and 59Co have been measured with the △E-E telescopic systems and Q3D magnetic spectrometer at a bombarding energy of 35MeV from the HI-13 Tandem,and analyzed with microscopic DWBA.Among the angular distributions of nine levels strongly populated by 56Fe(α,d)58Co reaction, the experimental data of 6.79MeV and 6.4MeV levels in 58Co were analyzed and discussed. The highest stretched configuration (1g9/2,1g9/2)9 was found and Jπ=1+ of 6.4MeV level was determined for the first time. No isolated stretched states were observed by 57Fe 59Co(α,d)reactions.This probably means that the strength of the stretched configuration spreads on a number of states. 相似文献
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Yin Shuzhi Zhu Yongtai Zhan Wenlong Guo Zhongyan Hu Xiaoqing Xi Hongfei Liu Guanhua Zhou Jianqun Fan Enjie Feng Enpu Wang Xiaoqiu 《中国物理C(英文版)》1994,18(8):673-679
Energy spectra of complex fragments emitted in the reactions of 46.7MeV/u 12C with different targets 197Au,115In and 58Ni have been measured by telescopes,consisting of a gis ionization counter followed by a position Sensitive semiconductor detector.Tha most probable kinematical energies.Ep of complex fragments and temperature parameters of long-live intermediate systems have been deduced by complex fragment ernergy spectra.The experimental values of Ep are lower than the calculated ones by E=Vcoul+2T.The experimental values of complex fragment yields can be reproduced by simple A.Friedman statistical evaporation model satisfactorily. 相似文献
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WANG Hong-Wei JIN Gen-Ming WU He-Yu XIAO Zhi-Gang ZHANG Bao-Guo DUAN Li-Min WEI Zhi-Yong LI Zu-Yu HU Rong-Jiang LIU Yong-Ying LU Zhao-Hui CHEN Ke-Liang 《中国物理C(英文版)》2002,26(11):1117-1124
The reaction of 22Na(p,γ)23Mg has been investigated at the Radioactive Ion Beam Line in Lanzhou(RIBLL) using a radioactive beam 23Al. The β+ delayed proton decay spectrum has been measured with the TOF-ΔE method and zero degree detectors. The half life of 23Al is determined to be T1/2=(476±45)ms by using a time scaler combined with the precision pulse generator,which is consistent with the other group's result of (470±30)ms. The known β+ delayed protons at Er=0.216,0.278,0.438,0.479MeV have also observed in the experiment. The resonance strength of isospin analog state (IAS) is calculated. The resonance intensity of IAS is (11.4±6.0)meV. A new energy level of β+ delayed proton decay has been identified at Ex=8.916MeV,and their relative intensity also been obtained. 相似文献
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ZHAO You-Xiong GUO Zhong-Yan ZHU Yong-Tai ZHAN Wen-Long HU Xiao-Qing XI Hong-Fei LIU Guan-Hua ZHOU Jian-Qun FENG En-Pu YIN Shu-Zhi WEI Zhi-Yong Fan En-Jie MA Yu-Gang 《中国物理C(英文版)》1992,16(11):1022-1029
The energy spectra and angular distribution of α particles emitted from 12C induced reactions with 58Ni,115In and 197Au have been measured.Three moving sources of emitting α particle are clearly seen from invariant cross section distribution in velocity coordinates.The experimental data were analyzed by using three moving sources.Extracted parameters of the source with half-beam velocity are in agreement with the systematic values from Fermi Gas Model.The energy spectra and the extracted parameters for various targets are discussed.The low energy peak in energy spectra is possibly from the emitted α particle from equilibrium system after pre-equilibrium emission of target-like products.The energetic α particles are mainly from projectile fragmentation and projectile-like fragmentation. 相似文献
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ACQM is applied to study the μ--mesenic molecules (αp,μ-) and (αp,2μ-).It is found that the ground state X2Σ+ of (αp,2μ-) is the repulsive one and the ground state X1Σ+ of (αp,2μ-) is a bound state with the equilibrium proton-proton separation Re=0.0078bohr and the minimum energy E=-551.78a.u.. 相似文献
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在14.7MeV中子能量下, 测量了85Rb(n,2n)反应同质异能态截面及其比值. 实验比值与Vandenbosh-Huizenga方法算出的理论值做了比较, 定出了自旋切割因子σ值. 相似文献
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The neutron capture reaction on a neutron-rich near closed-shell nucleus 82Ge may play an important role in the r-process following the fallout from nuclear statistical equilibrium in core-collapse supernovae. By carrying out a DWBA analysis for the experimental angular distribution of 82Ge(d, p)83Ge reaction we obtain the single particle spectroscopic factors, S2,5/2 and S0,1/2 for the ground and first excited states of 83Ge=82Ge⊙n, respectively. And then these spectroscopic factors are used to calculate the direct capture cross sections for the 82Ge(n, γ)83Ge reaction at energies of astrophysical interest. The optical potential for neutron scattering on unstable nucleus 82Ge is not known experimentally. We employed a real folding potential which was calculated by using the proper 82Ge density distribution and an effective nucleon-nucleon force DDM3Y. The neutron capture reactions on neutron-rich closed-shell nuclei are expected to be dominated by the direct capture to bound states. We will show that the direct capture rates on these nuclei are sensitive to the structure of the low-lying states. 相似文献
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The cross section measurement for the reaction 56Fe(n, p)56Mn was made using the activation method from 12 MeV to 18 MeV. The absolute cross section was determined at 14.61±0.20 MeV, the value obtained was 108.0±2.7mb. The associated particle method was used to determine the absolute neutron flux and compared with the recoil proton telescope. The agreement between both methods appeared to be within 1—2%. The resulting 56Mn activity was measured by using a φ10×7.6cm NaI (Tl) scintillation counter. The counting efficiency of the counter was achieved by means of a standard 56Mn source calibrated by the 4πβ-γ coincidence method. The result measured was compared with existing data. 相似文献