.0.1-20mev Energy Range Of N + (31) P Calculation And Evaluation Of A Full Set Of Neutron Data Theory

³¹P is the only stable isotope of phosphorus. The evaluation of neutron data of ³¹P in the energy range from 0.1 to 20MeV was carried out. According to the experimental data and theoretic program UNF code, the neutron data were re-evaluated, compared with the data of ENDF/B-6 and JENDL3.3. The neutron optical potential parameters for ³¹P were obtained respectively, according to the available neutron experimental data, with the code APOM94. The DWUCK4 code was used to investigate the cross section for neutron direct inelastic scattering.The experimental data of ³¹P from neutron-induced reaction with energy lower than 20MeV were collected from EXFOR and current publications. From fitting the total, non-elastic scattering cross section and elastic angular distributions, the parameters of neutron optical potential were calculated by the code APOM94. The parameters of the neutron optical potential is also employed as input data for the DWUCK4 code in order to get the cross section for neutron direct inelastic scattering. In UNF code the spherical optical potential is employed to calculate total cross section, shape elastic scattering cross section and its angular distribution, absorption cross section, etc. The UNF code's parameters of density level, giant dipole resonance, the nuclear level scheme, pair corrections, binding energy were taken from RIPL.The theoretical calculated results of UNF code were in good accordance with the experimental data. Our calculated values are both reasonable in shapes and in physics. The model calculation of n+³¹P improved the neutron reaction data, compared with the data of ENDF/B-6, JENDL3.3. The theoretical results of ³¹P with experimental data are given in B6 format and figures of this paper.