A global nucleon optical model potential
A global nucleon optical model potential
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DOI：
10.1016/0370-1573(91)90039-o
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发表时间：
1991-03
期刊：
影响因子：
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通讯作者：
R. Varner;R. Varner;W. J. Thompson;W. J. Thompson;T. McAbee;T. McAbee;E. Ludwig;E. Ludwig
中科院分区：
文献类型：
--
作者：
R. Varner;R. Varner;W. J. Thompson;W. J. Thompson;T. McAbee;T. McAbee;E. Ludwig;E. Ludwig
我们描述了一个新的参数化的核子-核光学模型的基础上的数据为A = 40至209，质子能量为16至65兆电子伏和中子能量为10至26兆电子伏，包括广泛的极化束数据的潜力。这种参数化称为CH 89，基于当前对光学势基础的理解，例如折叠模型和核物质方法。它显着不同于以往的全球参数化，特别是在薄弱的等矢势，参数化的潜在半径，和平滑的变化的潜在的能量。我们还描述了一个光学模型参数搜索系统，MINOPT，最小化程序的基础上。它适用于同时分析近300个精心挑选的角分布的大型数据库。参数的不确定性和参数之间的相关性估计使用非参数统计技术称为自助法。CH 89的目的是作为一个起点，为最终测试模型的核子-核相互作用，并立即使用的应用程序。
We describe a new parametrization of the nucleon-nucleus optical-model potential based on data for A = 40 to 209, protons energies of 16 to 65 MeV and neutron energies of 10 to 26 MeV, including extensive polarized-beam data. This parametrization, called CH89, is based on the current understanding of the basis of the optical potential, such as the folding model and nuclear matter approaches. It differs significantly from previous global parametrizations, especially in the weakness of the isovector potential, the parametrization of potential radii, and the smooth variation of imaginary-potential depths with energy. We also describe an optical-model parameter search system, MINOPT, based on the minimization program MINUIT. It is applied to analyze simultaneously a large database of nearly 300 carefully selected angular distributions. Parameter uncertainties and correlations between parameters are estimated by using the non-parametric statistical technique known as the bootstrap method. CH89 is intended to serve as a starting point for definitive tests of models of the nucleon-nucleus interaction, and to be of immediate use of applications.