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

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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http://hal.in2p3.fr/in2p3-01089644
Contributor : Sandrine Guesnon <>
Submitted on : Tuesday, December 2, 2014 - 9:41:01 AM
Last modification on : Friday, October 9, 2015 - 1:05:01 AM

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L. Ghys, A. N. Andreyev, M. Huyse, P. van Duppen, S. Sels, et al.. Evolution of fission-fragment mass distributions in the neutron-deficient lead region. Physical Review C, American Physical Society, 2014, 90, pp.041301. ⟨10.1103/PhysRevC.90.041301⟩. ⟨in2p3-01089644⟩

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