Eur. Phys. J. A (2020) 56: 46
https://doi.org/10.1140/epja/s10050-020-00036-9

Regular Article - Theoretical Physics

Calculated fission-fragment mass yields and average total kinetic energies of heavy and superheavy nuclei

¹ Mathematical Physics, Lund University, 221 00, Lund, Sweden
² Niels Bohr Institute, University of Copenhagen, 2100, Copenhagen Ø, Denmark
³ Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA

^* e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Received: 14 October 2019
Accepted: 6 January 2020
Published online: 7 February 2020

Abstract

Fission-fragment mass and total-kinetic-energy (TKE) distributions following fission of even-even nuclides in the region and , comprising 896 nuclides have been calculated using the Brownian shape-motion method. The emphasis is the region of superheavy nuclei. To show compatibility with earlier results the calculations are extended to include earlier studied regions. An island of asymmetric fission is obtained in the superheavy region, and , where the heavy fragment is found to be close to Pb and the light fragment adjusts accordingly. Most experimentally observed -decay chains of superheavy nuclei with terminate by spontaneous fission in our predicted region of asymmetric fission. In these cases, the pronounced large asymmetry is accompanied by a low TKE value compatible with measurements.