46.8MeV的 ~(12)C非弹性散射

在Glauber多重散射理论框架下,使用跃迁密度方法和三种N-N湮没势,计算了46·8MeV的反质子在~(12)C上的非弹性散射微分截面.理论曲线与实验数据符合得较好.     

46.8MeV的p+12C非弹性散射

在Glauber多重散射理论框架下，使用跃迁密度方法和三种N湮没势，计算了46.8MeV的反质子在¹²C上的非弹性散射微分截面. 理论曲线与实验数据符合得较好. 关键词： Glauber理论 反质子 非弹性散射 湮没势 跃迁密度     

三种N湮没势和+~(12)C非弹性散射

在Glauber多重散射理论框架下 ,使用跃迁密度方法和 3种 NN湮没势 ,计算了入射动量为6 0 0MeV c的反质子在12 C上的非弹性散射微分截面 .理论曲线与实验数据符合得甚好     

三种NN湮没势和p+ 12C非弹性散射

在Glauber多重散射理论框架下,使用跃迁密度方法和3种NN湮没势,计算了入射动量为600MeV/c的反质子在¹²C上的非弹性散射微分截面.理论曲线与实验数据符合得甚好     

—~（12）C弹性散射和一种周边湮灭势的研究

使用一种唯象的ＮＮ周边模型湮灭势，对１８０Ｍｅｖ的Ｐ－１２Ｃ弹性散射微分截面、极化角分布和自旋旋转参数进行了计算。结果表明，这种势模型与实验符合得较好。     

中能反质子-核的弹性和非弹性散射

利用实验的PN振幅和多重散射理论 ,在冲量近似下 ,入射能量在 1 80～ 1 80 0MeV范围内我们可以得到反质子的光学势。结果发现能量在 1 30～ 1 4 0MeV范围内 ,光学势强度的虚部几乎是个常数。用能量为 1 80MeV的反质子去打击1 2 C ,1 6O ,40 Ca和2 0 8Pb发生弹性散射和用相同能量的反质子去打击1 2 C发生非弹性散射 ,在程函近似下分析这些散射数据。在绝热近似下 ,用反质子光学势讨论一声子级的集体激发。同时预测了用能量为 1 80～1 833MeV的反质子打击1 2 C ,1 6O ,40 Ca ,2 0 8Pb的弹性散射以及同样情况下打击1 2 C的非弹性散射的微分散射截面。     

低能反质子的核散射与Glauber理论

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.     

中能区反质子与核的非弹性散射

运用多次散射理论的光学势获得反质子的扭曲波.在扭曲波冲量近似下,讨论了中能区反质子与原子核的非弹性散射.考虑了反质子能量从180MeV到1800MeV这一能区¹²C,的2+,3-态微分截面.在这一能区的低能端,(E=180MeV)DWIA能够很好的符合实验,同时,预示了更高能量可能出现的微分截面的理论结果.     

α粒子结构下的p-~(12)C非弹性散射

从12C原子核的α粒子结构观点出发,计算了共振区内能量为T p=200,400,600,700MeV,p-12C的2 (4.44MeV)和3-(9.64MeV)非弹性散射微分截面。其中将12C原子核跃迁形状因子分解成核内α粒子的跃迁形状因子和α粒子本身的形状因子的乘积。利用已知的原子核跃迁密度,得出12C原子核α粒子跃迁密度分布的解析式。理论结果与实验较好地符合。     

在＋~（16）O弹性散射中对一种唯象的N湮灭势的研究

在Ｇｌａｕｂｅｒ多重散射理论近似下，采用泡里关联的核波函数，使用一种唯象的Ｎ湮灭势，对１８０Ｍｅｖ的在１６Ｏ上的弹性散射微分截面进行了计算。结果表明，自旋效应可以忽略，这种势模型与实验符合得较好。     

Elastic and inelastic scattering of 185 MeV protons from 12C

The polarization of 185 MeV protons in elastic scattering and in the excitation of the 2⁺ state at 4.44 MeV and the 0⁺ state at 7.65 MeV in ¹²C has been measured in the angular region 2°–60°. Optical model calculations are performed for the elastic scattering. Angular distributions for the inelastic scattering from the 2⁺ state at 4.44 MeV and the 3^? state at 9.64 MeV are calculated in the distorted-wave impulse approximation (DWIA) as well as in the distorted-wave Born approximation (DWBA).     

Elastic and inelastic scattering of 12C by 12C in the energy range between 10 and 37.6 MeV

The elastic and inelastic scattering of ¹²C by ¹²C has been measured over a wide angular range employing a kinematical analysis with the help of position-sensitive detectors. The bombarding energy was varied in 200 keV steps between 10 and 37.6 MeV. The cross sections are analysed in the framework of compound fluctuations and the direct reaction model.     

Spin alignment in12C+12C inelastic scattering

The spin alignment P_zz of¹²C(2 ₁ ⁺ ) produced in¹²C+¹²C inelastic scattering at bombarding energies in the region of known resonances between E_cm=18.5 and 32.8 MeV has been determined with a γ-ray detector positioned in the direction of the scattering normal. The values obtained in the centers of three resonances as well as those obtained off-resonance are spread over a range between ?.05 and +.80 with no clear indication in favour of simple pictures of molecular resonances.     

Detailed energy dependence of the elastic and inelastic12C +12C scattering between 5 and 10 MeV/nucleon

Excitation functions for¹²C+¹²C elastic and inelastic scattering to 2⁺ level have been measured over the energy range 30–60 MeV (cm) by 250 keV steps using the kinematical coincidence method. The intermediate structure resonances disappear aboveE _cm=35 MeV while the broad and irregular structure becomes a general feature of the interaction at higher energies.     

Elastic and inelastic pion scattering on C and C at 100 MeV

Angular distributions of π⁺ and π^? at 100 MeV incident energy were measured for elastic and inelastic scattering from ¹²C and ¹³C. Elastic data were obtained between 6° and 180°. Inelastic scattering on the 2⁺ (4.4 MeV), 0⁺ (7.6 MeV), 3^? (9.6 MeV) and 1⁺ (12.7 MeV) states of ¹²C and on the $\text{3}\text{2}{}^{\mathrm{?}}\text{(3.7}\text{MeV}\text{),}\text{5}\text{2}{}^{\mathrm{?}}\text{(7.5}\text{MeV}\text{),}\text{9}\text{2}{}^{\mathrm{+}}\text{(9.5}\text{MeV}\text{)}$ and 11.7 MeV states of ¹³C was mea ¹²C results are compared to a Δ-hole model.     

Study of ~3He inelastic scattering on 13C and 14C at 37.9 MeV

The differential cross sections of elastic and inelastic scattering of ~3He ions on ~（13）C and ~（14）C have been studied at an energy of 37.9 MeV with a double folding model based on M3Y-Reid effective nucleon-nucleon interaction.The resulted parameters have been used for the standard Distorted Wave Born Approximation calculations of angular distributions corresponding to different excitations levels of ~（13）C and ~（14）C and deformation parameters have been deduced.     

Ternary fission involving4He emission in the16O (144 MeV)+232Th and12C (108 MeV)+197Au reactions

The results of coincidence measurements of⁴He emission with fission fragments in reactions of¹²C(108 MeV) ions with a¹⁹⁷Au target and of¹⁶O(144 MeV) ions with a²³²Th target are presented. On the basis of a Monte Carlo kinematic simulation of nuclear reactions the experimental energy spectra and velocity distributions of alpha particles have been analyzed. A conclusion has been drawn that the main source of⁴ He emission is evaporation from the fissioning compound nucleus. Substantial part of alpha particles was emitted from fully accelerated fission fragments. Some of⁴He nuclei with an average energy of about 16 MeV (in the CM system) emitted mainly perpendicular to the fission axis were identified as being similar long-range alpha particles produced in ternary fission of heavy nuclei at a low excitation energy. The emission multiplicities of these particles are considerably higher than those observed at a low excitation energy. The experimental results are compared with the statistical model predictions.     

Study of ~3He inelastic scattering on ~(13)C and ~(14)C at 37.9 MeV

The differential cross sections of elastic and inelastic scattering of ³He ions on ¹³C and ¹⁴C have been studied at an energy of 37.9 MeV with a double folding model based on M3Y-Reid effective nucleon-nucleon interaction. The resulted parameters have been used for the standard Distorted Wave Born Approximation calculations of angular distributions corresponding to different excitations levels of ¹³C and ¹⁴C and deformation parameters have been deduced.     

Comparison of predictions for alignment in inelastic scattering of 12C + 12C

The predictions for the spin alignment in the single 2⁺ excitation in ${}^{12}\text{C +}{}^{12}\text{C}$ scattering in four typical models, i.e., the Austern-Blair diffraction model, the Band Crossing Model, the DWBA model and the strong-coupling model, are compared among themselves and with experiment.