采用时域有限差分法研究了多因素对光学介质薄膜表面冗余节瘤粒子微分散射截面随散射角的变化规律.对光学介质薄膜表面冗余节瘤粒子复合散射进行建模,并针对典型半空间问题,对总散射场进行分解并对相应的场相位进行求解,给出网格剖分规...采用时域有限差分法研究了多因素对光学介质薄膜表面冗余节瘤粒子微分散射截面随散射角的变化规律.对光学介质薄膜表面冗余节瘤粒子复合散射进行建模,并针对典型半空间问题,对总散射场进行分解并对相应的场相位进行求解,给出网格剖分规则.将数值结果退化为冗余球体粒子,与MOM (Method of Moments)矩量法进行详细比较,验证程序的有效性.分析P偏振光入射下,入射角、长短轴轴比和镶嵌高度h对Cu和SiO_2镶嵌粒子微分散射截面随散射角的影响规律.结果表明:微分散射截面的最大峰值出现在入射角的镜面值角度;在镜向散射区域附近,对于扁平回转椭球体粒子微分散射截面随冗余节瘤粒子轴比的增大而减小,扁长回转椭球粒子的规律相反;在[-90°,-60°]散射角区域,微分散射截面与冗余节瘤粒子镶嵌高度成正比,镶嵌高度对介质粒子散射特性影响更大.展开更多
The measurements of elastic scattering angular distribution of 17F and 17O on 208Pb target around 7 MeV/u have been performed at RIBLL. The primary beam of 70 MeV/u 20Ne from SSC bombarded on the primary target (Be, 3...The measurements of elastic scattering angular distribution of 17F and 17O on 208Pb target around 7 MeV/u have been performed at RIBLL. The primary beam of 70 MeV/u 20Ne from SSC bombarded on the primary target (Be, 3.5 mm in thickness), which was installed in the TO chamber of RIBLL. The secondary beams of 17F or 17O were selected with D1, D2 and the degrader located at C1, and degraded the energies at T1 with the Al foils. The secondary beams with proper energies were then transported to T2 and hit on the 208Pb target (with thickness of 2 mg/cm2) there. The detector arrangement is schematically shown in Fig.1.展开更多
The a＋^2＋ Ne elastic scattering angular distributions at lower incident energies of Eα= 12.7-31.1 Me V have been analyzed by using the a-folding potential based on the α＋^16O structure model of the ^20Ne nucleus....The a＋^2＋ Ne elastic scattering angular distributions at lower incident energies of Eα= 12.7-31.1 Me V have been analyzed by using the a-folding potential based on the α＋^16O structure model of the ^20Ne nucleus. The a-folding potential with a standard Woods-Saxon type imaginary part, can reasonably describe experimental cross sections and the anomalous large angle scattering （ALAS） features. The anomaly of the a＋^20Ne scattering system is further confirmed , in the lower incident energy region.展开更多
A new set of global phenomenological optical model potential parameters has been obtained for helium-3 projectile, by simultaneously fitting the experimental data of helium-3 total reaction cross sections and elastic ...A new set of global phenomenological optical model potential parameters has been obtained for helium-3 projectile, by simultaneously fitting the experimental data of helium-3 total reaction cross sections and elastic scattering angular distributions in the mass range of target nuclei 20〈〈A〈209 at incident energies below 250 MeV. A comparison has been made between the extracted helium-3 global optical model potential parameters and the existing ones. The calculated results of total reaction cross sections and elastic scattering angular distributions are also agreement. compared with experimental data with their satisfactory展开更多
Several elastic scattering angular distributions of 12C from target nuclei of A≥ 39 are analyzed to extract the Woods-Saxon poten- tial parameters with the fixed imaginary potential and Coulomb radius parameters. Usi...Several elastic scattering angular distributions of 12C from target nuclei of A≥ 39 are analyzed to extract the Woods-Saxon poten- tial parameters with the fixed imaginary potential and Coulomb radius parameters. Using the best fitted diffuseness parameters, the correlations of the real part parameters with A1/3 1 ＋ A1/3 2and incident energy are revealed, and the systematic Woods-Saxon potential parameters are presented for nucleus-nucleus interaction. The proposed potential parameters can reproduce not only the elastic scattering angular distributions induced by 12C, but also many elastic scattering angular distributions induced by the projectiles other than 12C, thus providing important inputs for the study of nuclear reactions of heavy-ion systems.展开更多
The elastic scattering angular distributions of z113 projectile on light, medium, and heavy target nuclei including 7Li, 9Be, 12C, 16O, 24,25,26Mg, 27Al, 28Si, 40Ca, 58Ni, 59Co, 60Ni, 197Au, 208Pb, and 209Bi have been...The elastic scattering angular distributions of z113 projectile on light, medium, and heavy target nuclei including 7Li, 9Be, 12C, 16O, 24,25,26Mg, 27Al, 28Si, 40Ca, 58Ni, 59Co, 60Ni, 197Au, 208Pb, and 209Bi have been analyzed at various incident energies. The theoretical results have been obtained by using two different nuclear potentials within the framework of the optical model （OM）. Firstly, the double folding potential for real part and the Wood-Saxon （WS） potential for imaginary part have been applied. Secondly, the calculations with double folding potential for both real and imaginary part have been performed and compared with the experimental data. It has been seen that the results are in very good agreement with the experimental data. Also, the volume integrals and cross-sections for each reaction have been obtained. Finally, a new and simple formula for the imaginary potential depth has been derived to clarify the nuclear interactions of 11B nucleus at low energy reactions.展开更多
文摘采用时域有限差分法研究了多因素对光学介质薄膜表面冗余节瘤粒子微分散射截面随散射角的变化规律.对光学介质薄膜表面冗余节瘤粒子复合散射进行建模,并针对典型半空间问题,对总散射场进行分解并对相应的场相位进行求解,给出网格剖分规则.将数值结果退化为冗余球体粒子,与MOM (Method of Moments)矩量法进行详细比较,验证程序的有效性.分析P偏振光入射下,入射角、长短轴轴比和镶嵌高度h对Cu和SiO_2镶嵌粒子微分散射截面随散射角的影响规律.结果表明:微分散射截面的最大峰值出现在入射角的镜面值角度;在镜向散射区域附近,对于扁平回转椭球体粒子微分散射截面随冗余节瘤粒子轴比的增大而减小,扁长回转椭球粒子的规律相反;在[-90°,-60°]散射角区域,微分散射截面与冗余节瘤粒子镶嵌高度成正比,镶嵌高度对介质粒子散射特性影响更大.
文摘The measurements of elastic scattering angular distribution of 17F and 17O on 208Pb target around 7 MeV/u have been performed at RIBLL. The primary beam of 70 MeV/u 20Ne from SSC bombarded on the primary target (Be, 3.5 mm in thickness), which was installed in the TO chamber of RIBLL. The secondary beams of 17F or 17O were selected with D1, D2 and the degrader located at C1, and degraded the energies at T1 with the Al foils. The secondary beams with proper energies were then transported to T2 and hit on the 208Pb target (with thickness of 2 mg/cm2) there. The detector arrangement is schematically shown in Fig.1.
基金Supported by National Natural Science Foundation of China under Grant No.10865002
文摘The a＋^2＋ Ne elastic scattering angular distributions at lower incident energies of Eα= 12.7-31.1 Me V have been analyzed by using the a-folding potential based on the α＋^16O structure model of the ^20Ne nucleus. The a-folding potential with a standard Woods-Saxon type imaginary part, can reasonably describe experimental cross sections and the anomalous large angle scattering （ALAS） features. The anomaly of the a＋^20Ne scattering system is further confirmed , in the lower incident energy region.
基金supported by the National Natural Science Foundation of China (Grant No. 11175260)China Ministry of Science and Technology (Grant No. 2007CB209903)
文摘A new set of global phenomenological optical model potential parameters has been obtained for helium-3 projectile, by simultaneously fitting the experimental data of helium-3 total reaction cross sections and elastic scattering angular distributions in the mass range of target nuclei 20〈〈A〈209 at incident energies below 250 MeV. A comparison has been made between the extracted helium-3 global optical model potential parameters and the existing ones. The calculated results of total reaction cross sections and elastic scattering angular distributions are also agreement. compared with experimental data with their satisfactory
基金supported by the National Natural Science Foundation of China(Grant Nos.11375269,and 11490560)the National Basic Research Program of China(Grant No.2013CB834406)the National Key Research and Development Program of China(Grant No.2016YFA0400502)
文摘Several elastic scattering angular distributions of 12C from target nuclei of A≥ 39 are analyzed to extract the Woods-Saxon poten- tial parameters with the fixed imaginary potential and Coulomb radius parameters. Using the best fitted diffuseness parameters, the correlations of the real part parameters with A1/3 1 ＋ A1/3 2and incident energy are revealed, and the systematic Woods-Saxon potential parameters are presented for nucleus-nucleus interaction. The proposed potential parameters can reproduce not only the elastic scattering angular distributions induced by 12C, but also many elastic scattering angular distributions induced by the projectiles other than 12C, thus providing important inputs for the study of nuclear reactions of heavy-ion systems.
文摘The elastic scattering angular distributions of z113 projectile on light, medium, and heavy target nuclei including 7Li, 9Be, 12C, 16O, 24,25,26Mg, 27Al, 28Si, 40Ca, 58Ni, 59Co, 60Ni, 197Au, 208Pb, and 209Bi have been analyzed at various incident energies. The theoretical results have been obtained by using two different nuclear potentials within the framework of the optical model （OM）. Firstly, the double folding potential for real part and the Wood-Saxon （WS） potential for imaginary part have been applied. Secondly, the calculations with double folding potential for both real and imaginary part have been performed and compared with the experimental data. It has been seen that the results are in very good agreement with the experimental data. Also, the volume integrals and cross-sections for each reaction have been obtained. Finally, a new and simple formula for the imaginary potential depth has been derived to clarify the nuclear interactions of 11B nucleus at low energy reactions.
