Investigation on the Quasifission hindrance to synthesis 298Og

Abstract

Formation of a compound nucleus and production of its evaporation residue are hindered by quasi-fission process. It reduces the evaporation residue cross section since it takes place before the target and projectile combines to form a composite nucleus. We study the quasifission barriers ($B_{qf}$) for 14 fusion reactions in the formation of superheavy element ²⁹⁸Og within the framework of the di-nuclear system model. In particular, the influence of entrance channel parameters on quasifission barriers has been investigated. We notice that the quasifission barriers decreases with an increase in angular momentum and fusion barrier height. We constructed semi-empirical formulae for $B_{qf}$ as a function of mean fissility. The fusion reaction ⁴⁸Ca+²⁵⁰Cf poses larger $B_{qf}$. The larger evaporation cross section is observed for this fusion reaction for 3n evaporation channel with the cross-section of 0.81pb. Similarly, a smaller evaporation cross-section of about 0.033pb is observed for ⁵¹Cr+²⁴⁷Pu fusion reaction for 4n evaporation channel with both projectile and target being deformed, unlike to the previous reaction with spherical projectile and deformed target.