共查询到20条相似文献,搜索用时 33 毫秒
1.
ZHAN Wen-Long SHEN Wen-Qing ZHU Yong-Tai QIAO Wei-Min YIN Shu-Zhi FAN Guo-Ying JIN Gen-Ming LI Song-Ling 《中国物理C(英文版)》1986,10(1):63-67
The α-particles induced by 84.5MeV and 62 MeV 16O on 27Al are measured using ΔE-E semiconductor telescope. The energy spectra, the angular distributions, the contour plot of d2σ/dE﹒dΩ in the E-θ plane of the emitted α particles and the variation of the nuclear temperature with the emission angles are obtained. The mechanism of the direct α particles is discussed. 相似文献
2.
SIGNIFICANT EFFECT ON THE BINDING ENERGY OF 5He BY THE CHANGE OF THE INTERNAL ENERGY OF THE α PARTICLE 下载免费PDF全文
The change of the internal energy of the α-particle is usually neglected in the previous calculations of the binding energy of 5He.The present work shows explicitly that the change of the internal energy of the α-particle can influence significantly the theoretical value of the binding energy of 5He. 相似文献
3.
SHEN WEN-GING XU SHU-WEI WANG DA-YAN XIE YUAN-XIANG GUO ZHONG-YAN LI ZU-YU 《中国物理C(英文版)》1977,1(1):70-78
The energy spectra and angular distributions of alpha particles emitted in the reaction of 12C on 209Bi in the energy range 61.1—73.0 MeV were observed.The △E— E detector system was used to separate alpha particles and other particles emitted in this reaction.The results can be interpreted in terms of the reaction mechanism,in which a 8Be cluster is transfered from the projectile to the target.Good agreement has been obtained between the cross section for the production of the direct alpha particles and that of the heavy residue 217*Fr which,left in the ground state after evaporation of 2 neutron's,decays into 211At by alpha emission.The experimental energy spectra and angular distributions have been fitted by a semi-classical formula for the differential cross section per unit solid angle and energy interval. 相似文献
4.
STUDY OF ANGULAR DISTRIBUTION OF THE SCATTERING OF 31.2 MeV α PARTICLE BY THE NUCLEUS 10.11B 下载免费PDF全文
KONG XIANG-JING XIE XIAN-LIANG SUN CHONG-WEN BAO ZHENG-KAI WANG ZHEN-XIA 《中国物理C(英文版)》1981,5(5):600-606
Angular distribution of the scattering of 31.2 MeV-α-particle by the nucleus 10,11B is measured. Our results show that there is anomalous phenomenon in the case of 10B but there is not in 11B. Calculations and analysis are made with the optical model adding the Regge-Pole model. The results show that for the nucleus of 1p-shell, such as α+16O, the result of the calculation agrees very well with the experimental measurements but it fails in α+10B. As to the analysis with the double v-power optieal model for α+16O, the agreement is somewhat a little worse than the former's and the result for α+10B agrees only qualitatively with the experimental measurement. It is well known that the analysis with these models for α+40Ca agrees very well with the experimental data. Thus we may come to the conclusion that the mechanism of ALAS of the nucleus of 2s-1d shell is different from that of 1p-shell, and the mechanisms of ALAS of the nuclei of 1p-shell are also different. 相似文献
5.
A formalism for studying the interference between the direct reaction and the compound resonance processes is presented by the S-matrix theory; The mechanism of 12C(d, d) 12C, 12C(d, p1) 13C* and 12C(d, p2) 13C* reactions in the energy range Ed=1.63 MeV to 2.05 MeV is analysed.Te results show that: the interference between these two processes exists; and the quantitative relation between them is given. While the parameters of direct reactions and compound resonance processes, particularly for four resonance states with Ed=1.726, 1.767, 1.792 and 1.86 MeV are determined. 相似文献
6.
7.
The energy spectra of the alpha particles from the reaction 141Pr (n, α) 138La at 0°, 30°, 60°, 120°, 150° and 180° are measured and the angular distributions of the alpha particles are given. It shows that the predominant mechanism of the reaction at En=14 MeV is precompound emission. 相似文献
8.
YUAN Shuang-Gui ZHANG Tian-Mei XU Shu-Wei LI Wen-Xin ZHANG Li LIU Man-Qing QU Xiu-Lan LI Wei-Sheng 《中国物理C(英文版)》1988,12(5):712-714
Sources of 235Th were prepared by 14MeV neutron irradiation of Uranium and radiochemical separation.The β-spectra and γ-spectra were measured.The endpoint energy for 235Th β-decay was obtained to be 1.44±0.04MeV.Thus QB of 235Th was determined to be 1.47±0.07MeV. 相似文献
9.
CHENG YE-HAO GONG KUN ZHU GUANG-HUA YANG JIN-GANG DING XUN-LIANG CHEN RUI-GUANG JIANG CHENG-LIE 《中国物理C(英文版)》1979,3(5):624-638
The excitation functions of the 23Na(p,α0)20Neg·s.and the 23Na(p,α1)20Nelst reae-tion have been measured from Ep=1 to 2.5 MeV at θL=30°,150° and 30°,respectively.Around the resonance at 2.171 MeV,the excitation functions of the(p,α0)reactionhave been measured at 12 angles,then,some angular distributions have been obtained from these excitation functions.In addition,the angular distribution of the(p,α0)reaction for the resonance at 2.171 MeV has also been measured directly at energy ofthe resonance peak of the excitation function at 150°.For the resonance at 2.117MeV,the angular distribution have been measured at two energies,one at the energyof the resonance peak of the excitation function at 150°,another at the energy of thehalf maximum point of the resonance peak on the higher energy side.Around the re-sonance at 2.075 MeV,the excitation functions have been measured at 16 angles,andthe angular distribution has been obtained from three excitation functions.The an-gular distributions of the three resonances are not symmetric about 90°,and the posi-tions of the resonance peaks of these resonances varies with the angle of measurement.By means of the compound nucleus theory,discussions have been made for these non-solated resonances. 相似文献
10.
WU Hui-Fang 《中国物理C(英文版)》1986,10(3):308-315
Right-handed Currents in 0νββ decay with lepton-number nonconservation is discussed by using two nucleons mechanism and the effective operator approach of nuclear matrix elements in this paper. The relation between the mixing parameter η of right-handed currents and the Majorana neutrino mass mν is calculated from the experimental decay lifetime of 0νββ decay in 40Ca. Our results show that i) mν≤(18~23)eV, if |η|=0;ii) |η|≤(1.6~2)×10-5, if mν=0 相似文献
11.
Zhang Jin-ye 《中国物理C(英文版)》1980,4(5):649-651
An analysis and discussion has been made for the properties of the triple bandforking in Ge. We also give some supports and questions for the existing explana-tions. 相似文献
12.
CALCULATION OF THE ELASTIC-SCATTERING CROSS-SECTION OF ENERGETIC ELECTRON BY 40Ca NUCLEUS IN CONSIDERATION OF THE INFLUENCE OF“PION CONDENSATION” 下载免费PDF全文
Zhao Shu-ping 《中国物理C(英文版)》1980,4(5):569-575
Using Migdal's theoretical results of "pion Condensation", the influence of "π condensation" on the distribution of charge of N=Z nucleus is determined. The elastic-scattering differential cross-section of energetic electron by 40Ca nucleus is also calculated. The results of our calculations agree better with the experimental data. 相似文献
13.
WU Dan-Di 《中国物理C(英文版)》1985,9(3):362-366
We analyse the necessity and possibility of introducing an axial vector piece into the effective potential in order to cancel the spin-orbit interactions and the problems related thereby.
相似文献14.
MEASUREMENT AND ANALYSIS OF EMITTED α PARTICLES IN REACTIONS OF 12C BOMBARDING 12C,27Al AND natCa 下载免费PDF全文
XIE Yuan-Xiang WU Guo-Hua ZHU Yong-Tai MIAO Rong-Zhi FENG En-Pu YIN Xu MIAO He-Bin CAI Jing-Xiang SHEN Wen-Qing SUN Shu-MiNG WEI Jian-Jun LI Song-Lin 《中国物理C(英文版)》1985,9(1):71-76
The energy spectra and angular distributions of the emitted α particles in the reactions of the 69.5MeV 12C bombarding 12C,27Al and natCa have been measured and analysed using the fast particle exciton model. The contribution from the equilibrium and preequilibrium α-emissions is calculated to be 89%, 81% and 83% of the total α yields for the three reactions respectively, where the preequilibrium α emissions are 11%, 14% and 16% respectively. A small contribution comes from the other reaction mechanism. 相似文献
15.
SHEN Wen-Qing YIN Shu-Zhi GUO Zhong-Yan ZHU Yong-Tai CHEN Ju-Shen WU En-Jiu GUO Chi-Di FENG En-Pu XIE Yuan-Xiang 《中国物理C(英文版)》1984,8(5):628-632
The angular distributions of the elastic scattering for reaction 12C+28Si have been measured at the energies 69.5MeV, 66MeV, 59MeV, 56MeV using the large area position sensitive ionization chamber. The experimental data are fitted by use of the optical model. The probable reasons of the enhancement and oscillation of the elastic scattering angular distribution are discussed. 相似文献
16.
The differential cross sections of the elastic scattering of K±on 40—48Ca are calculated in the framework of eikonal approximation. The theoretical values obtained by using different parameters are compared. Through adjusting the parameters of the neutron distribution, the improvement of the coincidence between the theoretical values and the experimental data is arrived. The result shows that the r.m.s radius of the neutron distribution of 40Ca is smaller than that of the proton. (about 0.15fm smaller) and the surface thickness of the neutron distribution of 40Ca is thinner than that of proton. This is consistent with the results of computation made by H.F. method and agrees with the analysis of elastic scaatering of protons in the mediate energy on 40Ca by other authors. 相似文献
17.
NING Ping-Zhi 《中国物理C(英文版)》1987,11(5):708-712
Calculations have been performed for the energy separation of the two major substitutional states of the hypernucleus 40ΛCa. The (K-,π-) cross sections are calculated in the framework of the distorted-wave impulse approximation. Information about the ΛN interaction is then extracted, particularly, on the effects of the strength parameters on cross sections. The result shows that the ΛN interaction adopted previously for the 1p shell hypernuclei might be suitable to use for the (K-,π-) reaction in which medium heavy hypernucleus 40ΛCa are produced, but the value for the strength parameter of the central potential has to be changed from 0.99 to 0.78. 相似文献
18.
HADRONIC PRODUCTION OF J/ψ、ψ′(3684) AND THE CONTENT OF THE CHARMED STRATONS IN THE SEA OF THE STRATONS 下载免费PDF全文
Hadronic production of J/ψ、ψ′(3684) particles is discussed in this paper on thebasis of reference [1] after considering the massive effects of the charmed straton.The results of [1] are improved.With the aid of the decay of ψ″→DD and the effective coupling constant between ψ″(3772) and the charmed straton we estimate that the content of the charmed stratonin the sea of the stratons is 0.41% of the ordinary stratons at most. 相似文献
19.
THE CROSS-SECTION MEASUREMENTS FOR 59Co(n,p)59Fe,59Co(n,α)56Mn AND 59Co(n,2n)58Co REACTIONS 下载免费PDF全文
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