1 Nuclear Reaction Mechanisms of Neutron Induced Fission of 237 Np Nucleus Cristiana Oprea 1, 2, * , M. Ayaz Ahmad 3 , Alexandru Ioan Oprea 1 , Jalal H. Baker 3 , Naima Amrani 4 1 Joint Institute for Nuclear Research (JINR), Frank Laboratory of Neutron Physics (FLNP), Joliot-Curie 6, Dubna 141980, Moscow Region, Russian Federation 2 Romanian National Agency for Scientific Research, 21-25 Mendeleev, 010362, Sector 1. Bucharest 3 Physics Department, Faculty of Science, P.O.Box 741, University of Tabuk, 71491, Saudi Arabia 4 Ferhat Abbas University of Setif, Laboratory for Dosage and Analysis of Characteristic in height resolution (DAC), Department of Physics, Sétif, Algeria Abstract. For a few years at FLNP, JINR Dubna has already started new prospects for development of new neutrons facilities that will replace the IBR-2 neutron pulsed research reactor, which will finish its activities in 2032 year. Some of the agreed projects are using fission process induced by neutrons on neptunium based fuels. In the present research the neutron fission process on 237 Np nucleus was investigated. Various parameters during the neutron induced fission of 237 Np nucleus such as; fission cross-section, mass distributions, prompt neutrons emissions, isotopes production and neutrons spectra, were analyzed. The evaluations of the above observables were done by using TALYS – 9.1 software for incident neutron energy ranging from 0.4 MeV up to 25 MeV. The exact value of cross-section was measured as 5 – 5.5 MeV in the present work, whereas from literature, it was found up to 10 MeV. For neutrons spectra, a separation of the contribution of different nuclear reaction mechanisms was obtained. Some important yields and cross-section production of isotopes have been recorded and were found within good agreement with literature data. Keywords: neutron fission, cross sections, fission yields, nuclear reaction mechanisms, isotopes 1 Introduction In the modern sciences neutrons are successfully used in the fundamental researches for the studies of nuclear interactions, symmetry issues and structure of atomic nuclei. In applied researches, neutrons are used in condensed state physics, molecular biology, structural chemistry, material sciences, nondestructive control of volume objects and industrial products. Neutron researches become more effective with the increasing of the neutron flux intensity because the time of experiments is reduced, the precision of measurements enhances, new possibilities open in the studies of complex, small objects in neutron scattering experiments (Aksenov et. al., 2017, A), (Aksenov, 2017, B).