For simulations of controlled fusion problems, 4 major reactions are conventionally accounted for. In the present work, we compare cross sections of many thermonuclear reactions between lightest elements. We show that along with the traditional reactions, considerable contribution can be given by the reaction T+T→2n+⁴₂He . At low temperatures, two reactions D+p→γ+³₂He and T+p→γ+⁴₂He also have considerable contribution, the rest reactions are likely to be neglected. For the outlined reactions, we perform a more thorough processing of experimental data and construct high-precision approximations. For the new reactions, the accuracy of the S-factor is 2 – 6% and that of the reactivities is 3 – 5%.

thermonuclear reactions, cross sections, reactivities, approximations

Mathematical modelling in actual problems of science and technics

Belov Aleksandr Aleksandrovich,  M.V. Lomonosov MSU, Faculty of Physics; PFUR

Kalitkin Nikolaj Nikolaevich,  kalitkin@imamod.ru,  orcid.org/0000-0002-0861-1792,  KIAM RAS

Topor Oleg Igorevich,  M.V. Lomonosov MSU, Faculty of Physics

Fedorov Igor Alekseevich,  M.V. Lomonosov MSU, Faculty of Physics