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The calculation are based mainly on the nuclear optical model potential and relevant parameters are collected and selected from References Input Parameter Library (RIPL) which is being developed under the international project coordinated by the International Atomic Energy Agency (IAEA). The analyzing of a complete energy range has done starting from threshold energy for each reaction. The cross sections are reproduced in fine steps of incident neutron energy with 0.01MeV intervals with their corresponding errors. The recommended cross sections for available experimental data taken from CINDA library have been calculated for all the considered neutron induced reactions for spherical U-235 and U-238 isotopes. The calculated results are analyzed and compared with the experimental data. The optimized optical potential model parameters give a very good agreement with the experimental data over the energy range 0.001-20MeV for neutron induced cross section reactions (n,f), (n,tot), (n,el), (n,inl), (n,2n), (n,3n), and (n,γ) for spherical U235 and U-238 target elements. 1. INTRODUCTION The excitation functions for induced neutron nuclear reactions (n,f), (n,tot), (n,el), (n,inl), (n,2n), (n,3n), and (n,γ) measured for U-235 and U-238 with the aid of CINDA libraries. The cross sections for these reactions have been evaluated for the exact estimation of the cross sections among different authors. This paper describes the standard optical model potential analyses of the spherical U-235 and U-238 target elements. The References Input Parameter Library (RIPL) used for input parameters. These data are used in the real and imaginary part of optical model potentialspecial emphasis is placed in this study on the isotope dependence of the optical model potential. 2. RECOMMENDED CROSS SECTION The available measured data from CINDA library for the cross section (n,f), (n,tot) and (n,el) reactions for U-235 and for the cross sections (n,f), (n,tot), (n,2n) and (n,3n) reactions for U238 respectively. Those data have been plotted interpolated and recalculated in different fine steps and for different energy ranges of incident neutron by using Matlab-8.0 in order to calculate the recommended cross section with a minimum χ 2 for U-235 neutron induced reactions is equal to 0.001046 and a minimum χ 2 for U-238 neutron induced reaction is equal to 0.0006. The interpolation for the nearest data for each energy interval as a function of cross sections and their corresponding errors have been done using Matlab-8.0. The sets of experimental cross sections with their corresponding errors data are collected for different authors with different energy ranges. They re-arranged according to different energy intervals for different energy ranges. The normalization for the statistical distribution of cross sections errors to the corresponding cross section values for each author has been done. The interpolated values are calculated to obtain the recommended cross section which is based on the weighted average calculation according to the following expressions

Optical Model Potential Using CINDA Library for Neutron Induced Cross Section Reactions for Spherical Uranium-235,238 Isotopes