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Shell effects in the symmetric-modal fission of pre-actinide nuclei |
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| Authors: | S. I. Mulgin K. -H. Schmidt A. Grewe S. V. Zhdanov |
| Affiliation: | a Institute of Nuclear Physics, National Nuclear Centre, 480082, Almaty, Kazakhstan b Gesellschaft für Schwerionenforschung, Planckstraße 1, 64291, Darmstadt, Germany c Institut für Kernphysik, Technische Universität Darmstadt, Schloßgartenstraße 9, 64289, Darmstadt, Germany |
| Abstract: | Mass distributions of fragments in the low-energy fission of nuclei from 187Ir to 213At have been analysed. This analysis has shown that shell effects in symmetric-mode fragment mass yields from the fission of pre-actinide nuclei could be described if one assumes the existence of two strongly deformed neutron shells in the arising fragments with neutron numbers N1 ≈ 52 and N2 ≈ 68. A new method has been proposed for quantitatively describing the mass distributions of the symmetric fission mode for pre-actinides with A ≈ 180–220. |
| Keywords: | Nuclear fission Fission-fragment mass distributions Semiempirical fission model Shell effects Symmetric fission mode Pre-actinides (A ≈ 180–220) |
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