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Azimuthal distributions of final-state particles and fragments and transverse structure of emission source in high-energy nucleus-nucleus collisions 下载免费PDF全文
The azimuthal distributions of final-state particles and fragments produced in high-energy nucleus--nucleus collisions are described by a modified multisource ideal gas model which contains the expansions and movements of the emission sources. The transverse structures of the sources are
given in the transverse plane by momentum components p_x and p_y,and described by parameters in the model. The results of the azimuthal distributions, calculated by the Monte Carlo method, are in good agreement with the experimental data in nucleus--nucleus collisions at high energies. 相似文献
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在唯象模型的基础上, 考虑到碰撞氘核的D态分量对跃迁矩阵元的贡献和4He基态D态成分,我们从理论上计算了低能d(d,γ)α反应的天体物理学S因子.由理论计算再现d-d系统的结合能和以及由共振群方法计算的d-d弹性散射相移,得到Woods-Saxon势参数. 并由此计算的S因子与实验数据在Ec.m.<3MeV范围符合得较好, 尤其在天体物理学感兴趣的几百keV以下能区, 理论计算结果很好地符合实验数据. 由理论计算结果外推,计算了目前还没有实验数据的使恒星核合成反应过程能够进行的恒星能区(约1—20keV)的S因子. 相似文献
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We employ a direct capture method to study the influence of D-state in ^4He on S factor for the ^2H(d,γ)^4He reaction, in which the D-state component of the colliding deuterons and D-state component in ^4He ground state are considered. The parameters of Woods-Saxon (WS) potentials are obtained by reproducing the binding energy of d-d (i.e. ^2H-^2H) system, and d-d elastic scattering phase shifts calculated by the resonating group method. The theoretical results are in good agreement with the experimental data at Ec.m〈 3 MeV. The impact of the D state probability in ^4He on the extrapolated value of the astrophysical S factor for ^2H(d, γ)^4He reaction is discussed. 相似文献
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从基本的Dirac-Brueckner-Hartree-Fock微观理论出发,得到同时包含实部和虚部的核子-核散射的微观光学势,并利用折叠模型直接获得了核一核散射参数无关的整体微观光学势.考虑到核.核散射去弹过程高级项的贡献和6Li的碎裂效应,在微观光学势的实部和虚部中引入了修正因子NR,N1.系统研究了入射粒子6Li与靶核12C,28Si,40Ca,58Ni,90Zr和208Pb散射的微观光学势,计算中虚部增强因子取N1≈3.0,而实部修正因子NR对于给定的碰撞系统几乎是一个常数.理论很好地再现了所有被研究靶核和入射能量的弹性散射实验数据.参数无关的微观理论对核.核散射,尤其是对不稳定核.核系统反应的描述是有价值的. 相似文献
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从基本的Dirac-Brueckner-Hartree-Fock微观理论出发,得到同时包含实部和虚部的核子-核散射的微观光学势,并利用折叠模型直接获得了核-核散射参数无关的整体微观光学势.考虑到核-核散射去弹过程高级项的贡献和6Li的碎裂效应,在微观光学势的实部和虚部中引入了修正因子NR,NI.系统研究了入射粒子6Li与靶核12C,28Si,相似文献
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