Dumbbell shapes in the superasymmetric fission of heavy nuclei
Year: 2024
Type: article
Abstract: We have calculated the fission fragments' mass distributions for several isotopes of heavy and superheavy nuclei from uranium to flerovium within an improved scission point model. For all considered nuclei, in addition to the standard mass-asymmetric fission mode we have found the mass super-asymmetric mode with the mass of heavy fragments equal 190. For the actinide nuclei, the probability of superasymmetric fission is by six orders of magnitude smaller than for standard asymmetric fission. For the superheavy nuclei this probability is only by two orders of magnitude smaller. In all cases, the superasymmetric scission shapes are dumbbells with the heavy fragment close to a sphere. We have estimated the stability of the light fragment concerning the variation of the neck and found out that sequential ternary fission is not favored energetically. The calculations were carried out with nuclear shape described by generalized Cassinian ovals with six deformation parameters, α , α 1 , α 2 , α 3 , α 4 , and α 5 . The configuration at the moment of the neck rupture was defined by fixing α = 0.98 . This value corresponds to a neck radius r neck ≈ 1.5 fm. Published by the American Physical Society 2024
Source: Physical Review C
Authors: F. A. Ivanyuk, N. Carjan
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4405736849