Neutrons may be emitted from nuclear fusion or nuclear fission, or from any number of different nuclear reactions such as from radioactive decay or reactions from particle interactions. Light radioactive nuclei play an important role in many astrophysical environments. Such parameter as cross section of the capture reactions as a function of energy is very important for investigation of many astrophysical phenomena such as primordial nucleosynthesis of the Universe, main trend of stellar evolution, novae and super-novae explosion, X-ray bursts etc. The interest in the study is continued as processes of radiative neutron capture on light nuclei at low and ultralow energy is caused by several reasons. Firstly, this process plays a significant part in the study of many fundamental properties of nuclear reactions, and secondly, the data on the capture cross sections are widely used in a various applications of nuclear physics and nuclear astrophysics, for example, in the process of studying of the primordial nucleosynthesis reactions.