Semiclassical distorted wave model analysis of multistep direct(p,p′x)and(p,nx)reactions to the continuum
Semiclassical distorted wave model analysis of multistep direct(p,p′x)and(p,nx)reactions to the continuum
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连续体多步直接(p,p′x)和(p,nx)反应的半经典畸变波模型分析
DOI：
10.1103/physrevc.59.2136
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发表时间：
1999
影响因子：
3.1
通讯作者：
M. Kawai
中科院分区：
文献类型：
--
作者：
Y. Watanabe;R. Kuwata;Sun Weili;M. Higashi;H. Shinohara;M. Kohno;K. Ogata;M. Kawai
本文将半经典扭曲波（SCDW）模型推广到核子诱导预平衡核子发射反应的多步直接（MSD）过程中的三步过程。应用扩展的SCDW模型分析了入射能量为62-160 MeV的58 Ni（p，p ′ x），90 Zr（p，p′ x），90 Zr（p，n x）和209 Bi（p，p′ x）的MSD过程. SCDW计算与实验的双微分截面，除了在很小和很大的角度，没有可调的参数给整体良好的协议。考虑到非局部性的扭曲潜力的Perey因子，并被发现是必不可少的再生的绝对大小的横截面。讨论了靶核子的密度和动量分布以及介质中N-N截面对SCDW计算的影响。与其他模型的比较，特别是关于个人的多步过程的计算截面的贡献。在数值试验的基础上，讨论了对畸变波的局部半经典近似的有效性。
The semiclassical distorted wave (SCDW) model is extended to include three-step process in multistep direct (MSD) processes in nucleon-induced preequilibrium nucleon-emission reactions. The extended SCDW model is applied to analyses of MSD processes in 58 Ni (p, p′ x), 90 Zr (p, p′ x), 90 Zr (p, n x), and 209 Bi (p, p′ x) in the incident energy range of 62–160 MeV. SCDW calculations with no adjustable parameter give overall good agreement with experimental double differential cross sections, except at very small and large angles. The nonlocality of distorting potentials is taken into account in terms of the Perey factor, and is found to be essential for reproducing the absolute magnitude of the cross sections. Effects of the density and momentum distributions of target nucleons and the use of in-medium N− N cross sections on the SCDW calculation are discussed. Comparison with other models is made, in particular regarding the contributions of individual multistep processes to the calculated cross sections. Validity of the local semiclassical approximation to distorted waves, which is essential to SCDW is discussed on the basis of a numerical test.