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利用全量子方法改进且加入核核作用(PT)的修正库仑玻恩近似(MCBPT)和前人基于半经典的方法且不考虑核核作用的修正库仑玻恩近似(MCB)计算了散射平面和垂直平面内100 Me V/amu C6+单电离氦原子的全微分截面,研究了核核作用对截面的影响.其结果与实验数据和3DW理论进行了比较.发现,对于小动量转移,MCBPT计算结果与实验符合的很好;对于大动量转移,MCB结果很好的反映了实验数据.而且,我们详细的分析了扭曲势效应对截面的影响,结果表明随着动量转移的增加扭曲势效应迅速增强. 相似文献
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利用修正的库仑玻恩近似理论(MCBPT和MCB)计算了散射平面和垂直平面内100MeV/amu C6+ 单电离氦原子的全微分截面,研究了核核作用对截面的影响.其结果与实验数据和3DW理论进行了比较.发现,对于小动量转移,MCBPT计算结果与实验符合的很好;对于大动量转移,MCB结果很好的反映了实验数据.而且,我们详细的分析了扭曲势效应对截面的影响,结果表明随着动量转移的增加扭曲势效应迅速增强. 相似文献
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考虑核间相互作用,利用修正的库仑玻恩模型(MCB-PT)计算了入射能量为16 MeV 的O7+碰撞氦单电离的全微分截面,并将计算结果与最近的实验数据和三体库仑波(3C)模型及含核间相互作用的连续扭曲波程函初态 (CDW-EIS-PT)模型所得结果进行了比较,发现MCB-PT理论结果在中间动量转移条件下binary峰的位置与实验结果符合得很好,且位于动量转移的方向上。此外,分析了扭曲效应对全微分截面的影响,表明随着动量转移的增加,扭曲效应更加明显。 相似文献
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考虑核间相互作用,利用修正的库仑玻恩模型(MCB-PT)计算了入射能量为16 MeV 的O7+碰撞氦单电离的全微分截面,并将计算结果与最近的实验数据和三体库仑波(3C)模型及含核间相互作用的连续扭曲波程函初态 (CDW-EIS-PT)模型所得结果进行了比较,发现MCB-PT理论结果在中间动量转移条件下binary峰的位置与实验结果符合得很好,且位于动量转移的方向上。此外,分析了扭曲效应对全微分截面的影响,表明随着动量转移的增加,扭曲效应更加明显。 相似文献
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《原子与分子物理学报》2015,(6)
考虑核间相互作用,利用修正的库仑玻恩(MCB-PT)模型计算了入射能量为16 Me V的O~(7+)碰撞氦单电离的全微分截面,并将计算结果与最近的实验数据和三体库仑波(3C)模型及连续扭曲波程函初态(CDW-EIS)模型所得结果进行了比较,发现MCB-PT理论结果在中间动量转移条件下binary峰的位置与实验结果符合得很好,且位于动量转移的方向上.此外,分析了扭曲效应对全微分截面的影响,表明随着动量转移的增加,扭曲效应更加明显. 相似文献
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Charge Symmetry Breaking Effects in Elastic Nucleon Scattering From the 3H and 3He Mirror Nuclei
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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
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Production mechanism of neutron-rich nuclei around N =126 in the multi-nucleon transfer reaction ~(132)Sn+~(208)Pb
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The time-dependent Hartree-Fock approach in three dimensions is employed to study the multi-nucleon transfer reaction~(132) Sn +~(208) Pb at various incident energies above the Coulomb barrier. Probabilities for different transfer channels are calculated by using the particle-number projection method. The results indicate that neutron stripping(transfer from the projectile to the target) and proton pick-up(transfer from the target to the projectile)are favored. De-excitation of the primary fragments is treated by using the state-of-art statistical code GEMINI++.Primary and final production cross sections of the target-like fragments(with Z =77 to Z =87) are investigated. The results reveal that fission decay of heavy nuclei plays an important role in the de-excitation process of nuclei with Z 82. It is also found that the final production cross sections of neutron-rich nuclei depend only slightly on the incident energy, while those of neutron-deficient nuclei depend strongly on the incident energy. 相似文献
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N. K. Skobelev 《Physics of Atomic Nuclei》2014,77(11):1415-1420
Experiments devoted to studying cross sections for fusion and transfer reactions induced by the interaction of beams of halo-like (6He), cluster (6Li and 7Li), and loosely bound (3He) nuclei with nuclei of light and heavy elements are described. The cross sections obtained experimentally for such reactions are analyzed. Special features in the behavior of the cross sections for the formation of evaporation residues and products of transfer reactions at energies in the vicinity of the Coulomb barrier are revealed. In particular, an increase in the cross sections for fusion and transfer reactions involving halo-like nuclei and proceeding at energies in the subbarrier region is observed. The cross sections for neutron-transfer and light-cluster-transfer reactions reachmaximum values at an energy in the vicinity of the Coulomb barrier for the reaction being considered. 相似文献
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For relativistic beam nuclei up to 4He and medium heavy target nuclei, absorption cross sections and partial production cross sections are computed. Eclipse corrections are found to be essential. For C, N, and O beam nuclei, Coulomb dissociation is computed. 相似文献
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The deuteron break-up on heavy nuclei is studied for deuteron energies above the Coulomb barrier in the post form of the DWBA. The “region of formation” of the DWBA integral is found to be located mainly outside the nuclear force range. Finite-range, non-locality and virtual break-up effects are carefully considered. A comparison of our theoretical calculations with the available experimental coincidence cross sections shows good agreement. This supports strongly the validity of the direct break-up model assumed here. 相似文献
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Using the analogy with the problem of ionization and excitation of atoms in the propagation of relativistic charged particles
through a bulk of matter, the process of Coulomb dissociation of weakly bound relativistic nuclei and hypernuclei is theoretically
investigated in the framework of the two-cluster deuteron-like model. Explicit expressions for the total cross section of
Coulomb disintegration of weakly bound systems are derived taking into account the corrections due to the finite size of a
target nucleus. Numerical estimations for the Coulomb dissociation of relativistic hypernuclei 3HΛ and 6HeΛ are performed. It is shown that, owing to a sharp dependence of the Coulomb dissociation cross section on the binding energy,
experimental measurements of the cross section allow one to determine the values of binding energy for these systems.
The text was submitted by the authors in English. 相似文献
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The main progresses in the multinucleon transfer reactions at energies close to the Coulomb barrier are reviewed. After a short presentation of the experimental progress and theoretical progress, the predicted production cross sections for unknown neutron-rich heavy nuclei and the trans-uranium nuclei are presented. 相似文献
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Awad A. Ibraheem M. A. Hassanain S. R. Mokhtar M. A. Zaki Zakaria M. M. Mahmoud M. El-Azab Farid 《Physics of Atomic Nuclei》2012,75(8):969-972
Microscopic folding calculations based upon the effective M3Y nucleon-nucleon interaction and the nuclearmatter densities of the interacting nuclei have been carried out to explain recently measured experimental data of the 6He+120Sn elastic scattering cross section at four different laboratory energies near the Coulomb barrier. The extracted reaction cross sections are also considered. 相似文献
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Nuclear and Coulomb interactions in coherent fragmentation of relativistic nuclei in a photoemulsion
V. N. Fetisov 《Physics of Particles and Nuclei Letters》2014,11(1):36-42
The role of the nuclear and Coulomb interactions in coherent fragmentation of relativistic nuclei is discussed with the cluster-model analysis of the experimental data on the fragmentation of 7Li (P = 3A GeV/c) via the 3H + 4He channel in photoemulsion used as an example. The calculated electromagnetic contribution of ~10% to the cross section is not in conflict with the photoemulsion data and the upper estimate of ~40% derived from the earlier measurements of total cross sections for fragmentation of light nuclei using the counter technique. The observed irregularities in the differential cross section for 7Li fragmentation with a separated Coulomb peak at a very small momentum transfer Q are ascribed to the overlap of nuclear diffraction patterns arising from light (C, N, O) and heavy (Ag, Br) photoemulsion nuclei. The predicted diffraction cross sections in the inelastic channel drastically differ from the usual shape of nuclear diffraction in an elastic channel. For pure targets, they have a shape of oscillations with a few peaks of comparable intensity and show strong dependence on the form of the surface nuclear density and radii of the intranuclear cluster and target nucleus. The probability for two-body clustering in 7Li is estimated at about 0.7. 相似文献
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The total cross sections of some heavy-ion one-neutron transfer reactions involving 13C, which lead to excited states of one of the final nuclei, have been measured at energies below the Coulomb barrier. Products of the neutron spectroscopic factors in the initial and final states have been extracted using a Coulomb wave Born approximation, and have been compared with theory. 相似文献