Fusion interaction of light Σ-Hypernuclei

Physics of exotic nuclei are of particular interest in physics and such exotic hypernuclei are formed when one or more nucleon(s) of an atomic nucleus is replaced by one or more strange exotic hyperon(s) like (Λ, Σ, Ξ, Ω) etc. These exotic nuclei and the fusion reaction play an important role in several astrophysical phenomena. An obstacle called the Coulomb barrier caused by the strongly repulsive electrostatic forces between the positively charged nuclei prevents them from fusing under normal circumstances. However, fusion can occur under conditions of extreme pressure and temperature. That is why fusion reaction is often termed as thermonuclear reaction. Nuclei, which have positive charges, must collide at extremely high speeds to overcome the Coulomb barrier. Even there is a long history of research on this reaction, the reaction still attracts lots of attention and new experimental and theoretical works have been carried out continuously. A characteristic feature of the fusion reaction is that the cross sections have many fine structures, at energies both below and above the Coulomb barrier. In this contribution, we will analyze fusion reaction cross-section and barrier width for the sigma hypernuclei systems and discuss possible origins for the different behavior of fusion excitation functions for these systems. (author)