Entrance channels and alpha decay half-lives of the heaviest elements

Guy Royer (1) , K. Zbiri (1) , C. Bonilla (1)

1 SUBATECH - Laboratoire SUBATECH Nantes

The barriers standing against the formation of superheavy elements and their consecutive $\alpha$ decay have been determined in the quasimolecular shape path within a Generalized Liquid Drop Model including the proximity effects between nucleons in a neck, the mass and charge asymmetry, a precise nuclear radius and the shell effects given by the Droplet Model. For moderately asymmetric reactions double-hump potential barriers stand and fast fission of compact shapes in the outer well is possible. Very asymmetric reactions lead to one hump barriers which can be passed only with a high energy relatively to the superheavy element energy. Then, only the emission of several neutrons or an $\alpha$ particle can allow to reach an eventual ground state. For almost symmetric heavy-ion reactions, there is no more external well and the inner barrier is higher than the outer one.

Domaines: Physique Nucléaire Théorique [nucl-th]

Guy Royer, K. Zbiri, C. Bonilla. Entrance channels and alpha decay half-lives of the heaviest elements. Nuclear Physics A, 2004, 730, pp.22. ⟨10.1016/j.nuclphysa.2003.11.010⟩. ⟨in2p3-00023194⟩