Fission of superheavy nuclei: Fragment mass distributions and their dependence on excitation energy

N. Carjan, F. A. Ivanyuk, and Yu. Ts. Oganessian
Phys. Rev. C 99, 064606 – Published 10 June 2019

Abstract

The mass and total kinetic energy distributions of the fission fragments in the fission of even-even isotopes of superheavy elements from Hs (Z=108) to Og (Z=118) are estimated using a prescission point model. We restrict to nuclei for which spontaneous fission has been experimentally observed. The potential energy surfaces are calculated with Strutinsky's shell correction procedure. The parametrization of the nuclear shapes is based on Cassini ovals. For the just-before-scission configuration we fix α=0.98, which corresponds to rneck2 fm, and take into account another four deformation parameters: α1,α3,α4,α6. The fragment-mass distributions are estimated supposing they are due to thermal fluctuations in the mass asymmetry degree of freedom just before scission. The influence of the excitation energy of the fissioning system on these distributions is studied. The distributions of the total kinetic energy (TKE) of the fragments are also calculated (in the point-charge approximation). In Hs, Ds, and Cn isotopes a transition from symmetric to asymmetric fission is predicted with increasing neutron number N (at N168). Supersymmetric fission occurs at N160. When the excitation energy increases from 0 to 30 MeV, the peaks (one or two) of the mass distributions become only slightly wider. The first two moments of the TKE distributions are displayed as a function of the mass number A of the fissioning nucleus. A slow decrease of the average energy and a minimum of the width (at N162) is found.

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  • Received 4 April 2019

DOI:https://doi.org/10.1103/PhysRevC.99.064606

©2019 American Physical Society

Physics Subject Headings (PhySH)

  1. Properties
Nuclear Physics

Authors & Affiliations

N. Carjan1,2, F. A. Ivanyuk3, and Yu. Ts. Oganessian1

  • 1Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia
  • 2Horia Hulubei - National Institute for Nuclear Physics and Engineering, P.O. Box MG-6, RO-76900, Bucharest, Romania
  • 3Institute for Nuclear Research, 03028 Kiev, Ukraine

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Issue

Vol. 99, Iss. 6 — June 2019

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