Quasifission and fusion-fission lifetime studies for the superheavy element Z=120

Supremacy of optimal beam energy for synthesis of superheavy elements

“…One fact is well known that the entrance channel plays an important role in choosing a superheavy reaction and thus a priory to conducting the experiment we must first judge on the reaction. It can now be done well with one of our recent works [33]. According to it, all the superheavy reactions employed for the synthesis of SHEs Z = 119 and 120 pass these criteria.…”

Investigations on Fission of Compound Nuclei with Z=120

“…For an instance, the fusion reaction of 58 Fe+ 244 Pu [56] attains capture stage when fast moving projectile 58 Fe hits on a target 244 Pu. At this stage before forming compound nuclei it undergoes quasi-fission which is also in detail explained in literature [65]. If the projectile-target combinations attain compound nuclei, then there is a possibility of formation of superheavy nuclei through evaporation of neutron/proton/ gamma particles.…”

“…Many theoretical models, such as the GRAZING model [35], the Fokker-Planck equation [36], the DNS model [37,38], the improved quantum molecular dynamics (ImQMD) model [39], the complex WKB (CWKB) model [40], the Langevin equations [41], the quantum molecular dynamics model [42] and the time dependent Hartree-Fock model [43] predicted production cross sections in the superheavy region. In addition, many researchers theoretically predicted evaporation residue cross sections in the superheavy region [29,30,[44][45][46][47][48][49].…”

On the timescale of quasi fission and Coulomb fission

“…Here, the quantity Γ denotes an average width of the contributing single-particle states near the Fermi surface and normally, its value is taken as 2 MeV. The quantities ω m and ω qf are the frequency of the harmonic oscillator and inverted harmonic oscillator, respectively and these have been evaluated using a set of equations given in Manjunatha et al [62]. The nuclear temperature Θ(Z, A) depending on the level density parameter a is given by…”

“…Evaporation residue cross-section (σevr) [45], fusion-fission lifetime (τ f f ) [54], quasifission barrier [55] and cross-section (σ qf ) [56], quasifission lifetime (τ qf ) [57], maximum Coulomb-excitation energy transfer (MCET), fission barrier of the heavier -either projectile or target nuclei (B f h ) [48], Coulomb fission cross-section (σ cf ) [56], highest spin I state that can be populated, and corresponding ∆ECET . Where and R = R m [62] are the angular momentum and distance at which the nucleus-nucleus potential is minimum, respectively. β 21 and β 22 are the quadruple deformation parameters.…”