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Fusion-fission mechanism for synthesis of superheavy elements

Yoshihiro Aritomo, Flerov Laboratory of Nuclear Reactions, JINR, Dubna, Russia
Mercredi 8 octobre 2008 à 10h30 - Salle des séminaires

The search for new elements is a long-standing important subject in nuclear physics. The existence of the Island of Stability in superheavy mass region has been predicted arount Z=114 and N=184 using the macroscopic-microscopic model. Recently, the production of new superheavy elements has been reported by GSI (Z=110,111 and 112), FLNR (Z=113,114,115,116 and 118) and RIKEN (Z=110,111,112 and 113). In the theoretical study in this field, the dynamical aspects of the fusion-fission mechanism have been investigated as a time evolution of the nuclear shape taking into account friction. The trajectory calculation in the nuclear deformation space using a stochastic equation is performed. To synthesize the superheavy nuclei, the shell structure of colliding nuclei plays a very important role [1]. In this seminar, I focus on the effect of the shell structure in fusion process, and discuss the possibility of synthesizing new superheavy elements.

[1] Y. Aritomo, Nucl. Phys. A780 (2006) 222

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