Fission and quasifission of the composite system Z=114 formed in heavy-ion reactions at energies near the Coulomb barrier - INSPIRE

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Fission and quasifission of the composite system Z=114 formed in heavy-ion reactions at energies near the Coulomb barrier

Jan 23, 2019

9 pages

Published in:

Phys.Rev.C 99 (2019) 1, 014616

Published: Jan 23, 2019

DOI:

10.1103/PhysRevC.99.014616

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Abstract: (APS)

Background: Study of competition between compound nucleus fission and quasifission in heavy-ion-induced reactions and its dependence on the reaction entrance channel are important for picking up the right target-projectile combination for the synthesis of superheavy elements. Purpose: We investigate the decrease of fusion probability in the Cr52+Th232 reaction in comparison with that in the reactions Ca48+Pu244 and Ti48+U238. All reactions lead to the formation of composite systems with Z=114. Methods: Mass-energy distributions of binary fragments formed in the reaction Cr52+Th232 leading to the Fl284 composite system at energies of 265, 288, 302, and 320 MeV have been measured using the double-arm time-of-flight spectrometer CORSET. To study the properties and entrance channel dependence of quasifission in more detail, the mass and energy distributions of fragments formed in the Kr86+Pt198 reaction, leading to the same composite system Fl284, have also been measured. Results: The contribution of symmetric fragments in all fissionlike events is nearly the same for both the reactions Ti48+U238 and Cr52+Th232 at energies above the barrier, while it is greater for Ca48+Pu244. The analysis of total kinetic energy distribution of symmetric fragments formed in the reaction Cr52+Th232 shows that at an energy 15% over the Bass barrier the contribution of compound nucleus fission in the capture cross section is less than 0.4%. Conclusions: The fusion probability drops down by about a factor of 4 at the transition from the Ca48+Pu244 reaction to Ti48+U238 and about a factor of 25 at the transition to Cr52+Th232 at energies above the barrier. It agrees with the trend of fusion probability to decrease exponentially with increasing the mean fissility parameter of the composite system.

Nuclear Reactions

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