Fusion cross section of the superheavy $Z$ = 120 nuclei within the relativistic mean-field formalism

Abstract

Present theoretical investigations aim to explore the fusion characteristics of various isotopes of Z=120 within the relativistic mean-field (RMF) formalism. We predict the most suitable projectile-target combination for the synthesis of element Z=120. The microscopic nucleon-nucleon R3Y interaction and the RMF density distributions for targets and projectiles are used to calculate the nuclear interaction potential using the double folding approach. 17 different projectile-target combinations that allow a high $N$/$Z$ ratio are considered in the present analysis to calculate the capture and/or fusion cross-section of various isotopes of Z=120 within the $\ell -$summed Wong formula. Further, the equivalent surface diffusion parameter is estimated to correlate the surface properties interacting nuclei with the fusion cross-section. The four Ti-based reactions with the heaviest available target ${}^x$Cf, namely, ${}^{46}$Ti+${}^{248}$Cf, ${}^{46}$Ti+${}^{249}$Cf, ${}^{50}$Ti+${}^{249}$Cf, and ${}^{50}$Ti+${}^{252}$Cf, and also ${}^{54}$Cr+${}^{250}$Cm are found to have the most suitable target-projectile combinations for the synthesis of various isotopes Z=120. We also notice that ${}^{48}$Ca beams merely provide the required number of protons to synthesize the element with Z=120. We established a correlation among the surface properties of interacting nuclei with the fusion characteristics in terms of the equivalent surface diffusion parameter.