Sao Paulo potential version 2 (SPP2) and Brazilian nuclear potential (BNP)

被引:60
作者
Chamon, L. C. [1 ]
Carlson, B., V [2 ]
Gasques, L. R. [1 ]
机构
[1] Univ Sao Paulo, Inst Fis, Rua Matao 1371, BR-05508090 Sao Paulo, SP, Brazil
[2] Ctr Tecn Aeroesp, Inst Tecnol Aeronaut, Dept Fis, Sao Jose Dos Campos, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
Nuclear density; Nuclear interaction; Optical potential; ENERGIES;
D O I
10.1016/j.cpc.2021.108061
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
The REGINA code calculates the Sao Paulo potential version 2 (SPP2) and the Brazilian nuclear potential (BNP). The code also provides nuclear densities obtained from the Dirac-Hartree-Bogoliubov model, which are used to calculate the nuclear potentials. Elastic scattering cross sections are obtained within the context of the optical model, with different options for the real and imaginary parts of the optical potential. In this manuscript, we provide a summary of the theoretical framework and information about the use of the code. Program summary Program Title: REGINA.f CPC Library link to program files: https://doi .org /10 .17632 /vfkkjb8dv7.1 Licensing provisions: GPLv3 Programming language: Fortran-77 Nature of problem: We provide a code to calculate the nuclear potential between two nuclei according to two different models: the Sao Paulo potential version 2 (SPP2), that includes a dependence on the relative velocity between the nuclei, and the velocity independent Brazilian nuclear potential (BNP). These potentials assume the effective nuclear interactions proposed in [1,2], and are obtained within the double-folding approach with nuclear densities calculated through the Dirac-Hartree-Bogoliubov model [3]. Solution method: The code involves two files containing previously calculated results for theoretical neutron and proton distributions and also experimental charge densities obtained from electron scattering experiments. These results are used to obtain matter densities through convolution using Fourier transforms. The Fourier transform method is also employed to obtain the double-folding potentials. Integration of the Schrodinger equation with a complex optical potential is performed using the Cowell method [4,5]. With this, for a given system and energy, we obtain the S-matrix and the elastic scattering cross sections. Additional comments including restrictions and unusual features: The maximum angular momentum supported in the optical model calculations is 2000. (C) 2021 Elsevier B.V. All rights reserved.
引用
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页数:8
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