Fusion-fission dynamics in the superheavy nucleus production |
| |
Authors: | G Giardina P D’Agostino G Fazio M Herman AI Muninov A Nasirov G Oliva R Palamara R Ruggeri |
| |
Institution: | (1) Dipartimento di Fisica dell’Università di Messina, Istituto Nazionale di Fisica Nucleare, Sezione di Catania, 98166 Messina, Italy;(2) IAEA, A-1400 Vienna, Austria;(3) Institute of Nuclear Physics, 702132 Ulugbek, Tashkent, Uzbekistan;(4) Bogoliubov Laboratory of Theoretical Physics, JINR, 141980 Dubna, Russia;(5) Dipartimento PAU dell’Universitá di Reggio Calabria, 89100 Reggio Calabria, Italy |
| |
Abstract: | The fusion-fission reaction mechanism leading to the massive nucleus formation is studied. We investigate the superheavy nucleus
formation in heavy-ion induced reactions by analysing the evaporation residue (ER) production in order to study the fusion
dynamics and the decay properties of nuclei close to the stability island at Z=114. We consider the 61Ni+208Pb, 48Ca+238U and 48Ca+244Pu reactions that lead to the Z=110, 112 and 114 superheavy elements respectively.
By using the dinuclear system (DNS) concept of the two interacting nuclei we calculate the quasifission-fusion competition
in the entrance channel and the fission-evaporation competition along the de-excitation cascade of the compound nucleus. The
dynamics of the entrance channel allows us to determine the beam energy window which is favorable to the fusion, while the
dynamic evolution of the compound nucleus on the shell correction to the fission barrier and the dissipative effects influence
the fission-evaporation competition in order to obtain the residue nuclei from the superheavy nucleus formation. We also calculate
the τ
n
/τtot ratio at each step of the de-excitation cascade of the compound nucleus and we present a systematics of τ
n
/τtot (at first step of the cascade) for many reactions that lead to nuclei with Z=102–114. |
| |
Keywords: | Quasifission fusion fission evaporation residues superheavy elements |
本文献已被 SpringerLink 等数据库收录! |
|