A comprehensive analysis of quasifission lifetimes in the superheavy element region 104 ≤ Z ≤ 120

Abstract We analyzed quasifission lifetimes of superheavy elements (SHEs) within 104 ≤ Z ≤ 120 and mass number range 243 ≤ A ≤ 301 considering various projectile-target combinations. Nucleus-nucleus potentials were evaluated using the nuclear proximity 2010 model, and quasifission barriers were evaluated as the difference between minimum and maximum potentials. The quasifission lifetimes varied from 0.1 zs to 2040 zs, with lifetimes above 1600 zs for 249 145Rf, 248 143Db, 260 154Sg, and 263 156Hs. The quasifission lifetimes decreased with increasing Z, dropping to 0.1 zs at Z=120. Shorter quasifission lifetimes may contribute to the reduction in production cross-sections from nanobarns to picobarns for elements with Z=104 to Z=118. The model was validated against data available in literature, generally producing lower values except for 34S+186W, and 238U+48Ca, where significant increases were observed.