Fission of super-heavy nuclei: Fragment mass distributions and their dependence on excitation energy
Journal Title: Eurasian journal of physics and functional materials - Year 2019, Vol 3, Issue 1
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 pre-scission 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 a = 0.98 , what corresponds to rneck = 2 fm, and take into account another four deformation parameters: a1 , a1 , a4 , a6 . 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 N = 168). Super-symmetric fission ocurs at N = 160. 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 N =162) is found.
Authors and Affiliations
N. Carjan, F. A. Ivanyuk, Yu. Ts. Oganessian
Keywords
Related Articles
- EP ID EP558892
- DOI 10.29317/ejpfm.2019030101
- Views 85
- Downloads 0
Microscopic analysis of the 12,14Be scattering on 12C and protons
Differential cross sections of elastic scattering of 12,14Be on 12C and protons are analyzed within the microscopic model of the optical potential (OP). The microscopic OP consists of the double folding real part and the...
Influence of overlapping between the fluorescence spectra of dye molecules and the spectrum of plasmon absorption of silver nanoparticles on the luminescence of laser dyes in ethyl alcohol
In the present work, the influence of the degree of overlapping between the plasmon absorption spectrum of silver nanoparticles and the luminescence spectra of P6Zh, phenalamine 160, and oxazine 17 on their luminescence w...
Analysis of (11Li+9Be)-reaction in the framework of the time-dependent Schrodinger equation
Neutron transfer and nucleus breakup cross sections in (11Li+9Be)-reaction are calculated at energy range up to 32 MeV/nucleon. The evolution of probability density of external weakly bound neutrons of 11Li and the proba...
Discovery of elements 113 - 118
Review of discovery and investigation of isotopes of elements 113-118 produced in the reactions of 48 Ca with target nuclei 238 U- 249 Cf is presented. The synthesis of the heaviest nuclei, their summary decay properties...
Magnetron deposition of yttria-stabilised zirconia electrolyte for solid oxide fuel cells
The aim of the article is to review the latest achievements in the field of magnetron deposition of thin-film yttria-stabilised zirconia (YSZ) electrolyte for solid oxide fuel cells (SOFC). The main attention is paid to th...