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

Martin Albertsson; B. Gillis Carlsson; Thomas Døssing; Peter Möller; Jørgen Randrup; Sven Åberg

doi:10.1140/epja/s10050-020-00036-9

EPJ

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

Martin Albertsson¹^*, B. Gillis Carlsson¹, Thomas Døssing², Peter Möller¹, Jørgen Randrup³ and Sven Åberg¹

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

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 $74 \le Z \le 126$ and $92 \le N \le 230$ , 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, $106\le Z\le 114$ and $162\le N\le 176$ , where the heavy fragment is found to be close to $^{208}$ Pb and the light fragment adjusts accordingly. Most experimentally observed $\alpha$ -decay chains of superheavy nuclei with $$Z > 113 $$

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.

15th European Conference on Atoms Molecules and Photons (ECAMP)
June 30 to July 4, 2025
Innsbruck, Austria

EPJ

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

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