共查询到19条相似文献,搜索用时 109 毫秒
1.
在扭曲波冲量近似下,讨论了反质子与核的电荷交换反应A(p,n)B和非弹性散射A(p,p′)*A.并具体地计算能量为Ep=179.7MeV和46.8MeV下12C(p,n)12B,18O(p,n)18N和18O(p,p′)18O的微分截面.用严格的分波法处理扭曲波.非弹性散射的微分截面能符合实验.同时预示了在这些能量下,反质子与核发生电荷交换反应可能出现的微分截面理论结果. 相似文献
2.
运用实验的pN散射振幅和多次散射理论,在冲量近似下考虑反质子能量从180MeV至1800MeV的光学势,发现此能区反质子光学势的虚部强度在130—140MeV附近.用所获得的光学势,计算12C,26O,40Ca和208Pb等满壳层核在五个能量下的弹性散射微分截面.看到所用的光学势,在180MeV能很好地符合实验数值.本文还预示了此能区在各个核上的理论结果. 相似文献
3.
运用多次散射理论获得中能区的反质子光学势.这一光学势扩大到包含自旋轨道耦合项,并用它求得反质子的扭曲波.在扭曲波冲量近似下,讨论中能区反质子与原子核非弹性散射的微分截面和极化度.计算反质子能量从180-508MeV间12C12C的2+,3-态的和Pf(θ).在低能端理论结果 能够很好的符合 实验.同时预言了更高能量下可能出现的 和Pf(θ)的理论结果. 相似文献
4.
研究镜核之间的反质子与原子核的电荷交换反应. 在扭曲波冲量近似下,用严格的分波法分析反质子能量是179.7MeV和46.8MeV下13N(p,n)13C和15O(p,n)15N可能到达的能态的微分截面. 并指出同位族相似态跃迁与非相似态跃迁的差异. 相似文献
5.
在扭曲波冲量近似的框架下,本文讨论了A(p,p)A非弹性碰撞.并具体地计算了能量为46.8MeV和179.7MeV的12C(p,p)12C的 2+,3-态微分截面.用严格的分波法处理扭曲波.计算表明,反质子非弹性过程用DWIA是一个好的近似.同时,讨论了束缚态行为的重要性.由于反质子受核的强吸收原因,要求具有准确的核外束缚态波函数. 相似文献
6.
低能反质子的核散射与Glauber理论 总被引:1,自引:0,他引:1
运用Glauber多次散射理论,分析低能量反质子与4He核的弹性散射微分截面的实验结果.看到反质子能量低到19.6MeV时,多次碰撞的特征仍然是主要的.用光学模型的计算和比较,也得到相同的结论. 相似文献
7.
反质子与原子核弹性散射的分析 总被引:1,自引:0,他引:1
用反质子与核的光学势分析了反质子入射能量为50MeV和180MeV时12C,16,18O,40Ca和208Pb核的弹性散射微分截面.讨论了反质子光学势是强吸收型的特点.从寻找最佳符合实验的光学势分析中发现:弥散参数a的可变性很小,且它随核的增大而增大.光学势的实部是一个浅位.光学势在核中的吸收系数趋于零,因此弹性散射主要发生在核的表面. 相似文献
8.
A(p,p)A*非弹性碰撞过程,若反质子的光学势包含了自旋轨道耦合势,它在碰撞过程中不但能激发正常宇称态,也能激发反常的宇称态,以及非弹性过程的极化度.本文在DWIA框架下导出了微分截面(dσ/dΩ)f,i,极化度P(θ).并对入射能量为46.8MeV和179.7MeV 12C(p,p)12C*的2+,3-和1+态微分截面、极化度进行严格的分波方法计算.计算与实验符合很好.由于反常宇称态的非弹过程已被测得,表明反质子光学势的自旋效应不容忽视. 相似文献
9.
根据中子与天然核Cr及其同位素反应的总截面,去弹性散射截面和弹性散射角分布的实验数据,获得了入射中子能量从1MeV—250MeV的一组普适中子与Cr及其同位素反应的光学模型势参数.应用光学模型,扭曲波玻恩近似理论,宽度涨落修正的Hauser-Feshbach理论,和预平衡反应的激子模型,计算和分析了中子与52Cr反应的所有截面、角分布、能谱和双微分截面.理论计算与实验数据进行了分析比较. 相似文献
10.
11.
Li Yangguo 《中国物理C(英文版)》1994,18(2):186-192
The distorted wave of antiproton is obtained by an optical potential derived from the multiple scattering theory In the framework of the distorted wave impulseapproximation, we discuss the antiproton-nucleus inelastic scattering at intermediate energies. The inelastic differential cross sections of 2+, 3- states at antiproton energies from 180 MeV to 1800 MeV are calculated. It is shown that DWIA fitted the experimented data quite well, and theoretical results of inelastic cross sections at higher energies are predicted. 相似文献
12.
The correction factors for Coulomb effects in inelastic electron scattering are given for electric quadrupole transitions. The cross sections in Born approximation and distorted wave Born approximation are calculated in the liquid drop model for electron energies between 20 and 80 MeV and nuclei up toZ=26. 相似文献
13.
14.
《Nuclear Physics A》1987,464(3):395-414
Measurements of differential elastic and inelastic cross sections for neutron scattering from 16O at incident energies 18 to 26 MeV are presented. In addition to cross sections for neutron scattering differential cross sections for proton scattering up to 66 MeV are described in terms of phenomenological optical model potentials. At 24.5 MeV incident energy inelastic scattering up to 11.5 MeV excitation was measured. The elastic and inelastic compound nucleus contributions were examined. Direct inelastic scattering from the normal parity states was calculated using the DWBA and coupled-channel formalisms. The inelastic scattering cross section from non-normal parity state 2− was calculated using the coupled-channel formalism via multi-step processes. Cross sections due to inelastic scattering from some of the states, which are thought to be members of an excited state rotational band were calculated using both vibrational and rotational approaches and were compared. 相似文献
15.
V. K. Lukyanov E. V. Zemlyanaya K. V. Lukyanov Ali El Lithi Ibrahim Abdulmagead 《Bulletin of the Russian Academy of Sciences: Physics》2014,78(5):421-426
Cross sections of inelastic scattering of π-mesons from Si, Ni, and Pb nuclei at energy T lab = 291 MeV are calculated using the distorted wave approximation. The microscopic direct and transition optical potentials are determined by specifying the pion-nucleon scattering amplitude and the nuclear density distribution, where we use the in-medium πN amplitude parameters obtained earlier by analyzing the elastic scattering data for the same nuclei. The cross sections are calculated on the basis of the relativistic wave equation. The deformation parameters of the nuclei are obtained by comparing inelastic scattering cross sections with the appropriate experimental data. 相似文献
16.
B. A. Urazbekov A. S. Denikin S. K. Sakhiev S. M. Lukyanov 《Bulletin of the Russian Academy of Sciences: Physics》2017,81(6):690-694
Data on elastic and inelastic scattering, and the reactions of few-nucleon transfers in the interaction between the nuclei of deuteron and 9Be at energies of around 10 MeV/nucleon, are analyzed. A theoretical analysis is performed using the double-folding potential model with the wave function of the ground state of the 9Be nucleus, constructed in the three-cluster α + α + n-approximation. Calculations of the cross section of elastic scattering for the reaction d + 9Be using the calculated folding potential are preformed using the optical model. The resulting optical potential is used to analyze cross sections of transfer reactions and inelastic scattering in the context of the distorted waves method. A comparative analysis of the experimental data and theoretical calculations is performed. 相似文献
17.
H. -H. Knitter M. M. Islam M. Coppola 《Zeitschrift für Physik A Hadrons and Nuclei》1972,257(2):108-123
The angular distribution of neutrons emitted by elastic, inelastic and fission processes on235U were measured at the incident neutron energies of 1.5, 1.9, 2.3, 4.0, 4.5, 5.0 and 5.5 MeV using nanosecond time-of-flight technique. The differential elastic scattering cross sections and their angular distributions at all the seven energies are presented. The total elastic scattering cross sections, angle and energy integrated cross sections for the inelastically scattered neutrons in energy bands of 200 keV, fission cross sections and the angular distributions of fission neutrons were extracted at 1.5, 1.9 and 2.3 MeV incident neutron energies. The energy distributions of the prompt fission neutrons and of the inelastically scattered neutrons are given at the incoming neutron energies of 1.5, 1.9 and 2.3 MeV; and the average fission neutron energies and the inelastic neutron evaporation temperatures were also evaluated at these energies. 相似文献
18.
The Coulomb effect in high energy antiproton-nucleus elastic and inelastic
scattering from 12C and
16O is studied in the framework of Glauber multiple
scattering theory for five kinetic energies ranged from 0.23 to 1.83 GeV. A microscopic shell-model nuclear wave functions, Woods-Saxon single-particle wave functions, and experimental
pN amplitudes are used in the calculations. The results show that
the Coulomb effect is of paramount importance for filling up the dips of differential cross sections. We claim that the present result for inelastic scattering of
antiproton-12C is sufficiently reliable to be a guide for measurements in the very
near future. We also believe that antiproton nucleus elastic and inelastic scattering
may produce new information on both the nuclear structure and the antinucleon-nucleon interaction, in particular the
p-neutron interaction. 相似文献
19.
Presently available experimental data on the total cross sections and on the cross sections for the elastic and inelastic scattering of nucleons, antinucleons, π- and K-mesons by atomic nuclei at energies higher than 50 MeV are summarized. The nucleus-nucleus cross sections for kinetic energies higher than 50 MeV/nucl. are also given. 相似文献