A region of oblate nuclides centred at Z = 114 and of spherical nuclides centred at the magic nucleus - A possible scenario to understand the production of superheavy elements beyond copernicium
GSI Helmholzzentrum fuer Schwerionenforschung GmbH, 64291 Darmstadt, Germany
The recent experiments at FLNR, Dubna, demonstrated that cross sections to produce SHEs by 48Ca induced reactions on actinide targets increase beyond Z = 111, reach a maximum of 5 pb at Z = 114/115, and fall below the 1 pb-level at Z = 118. A scenario is proposed to understand the ﬁndings within the frame of former experimental results of heavy element production and theoretical predictions on the stability of the nuclides concerned. New ingredients introduced are 1) to shift the next proton shell beyond Pb from Z = 114 to Z = 122, 2) the isotopes of elements Z = 112 to Z = 118 are deformed and their nuclei have oblate shapes, and 3) the ﬁssion barriers around the next magic nucleus 306122184 are larger than the neutron separation energies and reach values in the range of 10 MeV. The ascent of the ﬂat top at 306122184 is described by the proposed scenario, which likewise excludes to reach the doubly closed shell region at the top by today s experimental methods in complete fusion reactions.
© Owned by the authors, published by EDP Sciences, 2011