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Evolution of fission-fragment mass distributions in the neutron-deficient lead region

L. Ghys et al.
Phys. Rev. C 90, 041301(R) – Published 15 October 2014

Abstract

Low-energy β-delayed fission of At194,196 and Fr200,202 was studied in detail at the mass separator ISOLDE at CERN. The fission-fragment mass distributions of daughter nuclei Po194,196 and Rn202 indicate a triple-humped structure, marking the transition between asymmetric fission of Hg178,180 and symmetric fission in the light Ra-Rn nuclei. Comparison with the macroscopic-microscopic finite-range liquid-drop model and the self-consistent approach employing the Gogny D1S energy density functional yields discrepancies. This demonstrates once more the need for dynamical fission calculations, because for both models the potential-energy surfaces lack pronounced structures, in contrast to those for the actinide region.

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  • Received 27 June 2014
  • Revised 29 August 2014

DOI:https://doi.org/10.1103/PhysRevC.90.041301

©2014 American Physical Society

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Vol. 90, Iss. 4 — October 2014

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