Abstract: [Background] As one of the fourth generation of nuclear energy system, thorium molten salt reactor nuclear energy system (TMSR) has been greatly improved in sustainability, safety, economy and reliability. In the design and manufacture of TMSR, a large number of nuclear reaction data is indispensable. [Purpose] The full set of microcosmic data for n+^74,75,77,79As reaction, including the theoretical calculations of total cross section, elastic cross section, various of reaction channels cross section, elastic and inelastic scattering angular distribution, energy spectra and double differential cross sections for six kinds of emitted particles (n,p,α,d,t,He-3), would be calculated. [Methods] Based on the assumption of the optical model and the experimental data of total cross section and elastic scattering angular distributions for n+⁷⁵As reaction, a set of optimal optical potential parameters which universally suitable for n+^74,75,77,79As are obtained. On the premise of the parameters, the cross sections, energy spectra and double differential cross sections for n+^74,75,77,79As reaction are calculated and analyzed by the UNF program which based on the optical model, distorted wave Bom approximation theory, the unified Hauser-Feshbach theory and exciton model. [Results] The theoretical results of the full set of microcosmic data are in agreement with the experimental data, and the theoretical results of regions without experimental data are given. [Conclusion] The full set of microcosmic data for n+^74,75,77,79As reaction based on this set of optical potential parameters is reasonable, the main theoretical model can describe the nuclear reaction commendably, the full set of microcosmic data obtained in this work can meet the requirements of nuclear engineering and medicine, it also has significance for the study of nuclear reaction.

Key words: The full set of microcosmic data for neutron nuclear reaction, Optical model, Reaction cross section, Hauser-Feshbach statistical theory and exciton model