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

Research output: Contribution to journalArticlepeer-review


  • Andrei N. Andreyev
  • Mark Huyse
  • Piet Van Duppen
  • Simon Sels
  • B. Andel
  • S. Antalic
  • A. Barzakh
  • L. Capponi
  • T.E. Cocolios
  • X. Derkx
  • H. De Witte
  • J. Elseviers
  • D.V. Fedorov
  • V.N. Fedosseev
  • F. P. Hessberger
  • Z. Kalaninova
  • U. Köster
  • J.F.W Lane
  • V. Liberati
  • K.M. Lynch
  • B.A. Marsh
  • S. Mitsuoka
  • P. Möller
  • Y. Nagame
  • K. Nishio
  • S. Ota
  • R.D. Page
  • D. Radulov
  • M.M. Rajabali
  • J. Randrup
  • E. Rapisarda
  • S. Rothe
  • K. Sandhu
  • M.D. Seliverstov
  • A.M. Sjödin
  • V.L. Truesdale
  • C. Van Beveren
  • P. Van den Bergh
  • Y. Wakabayashi
  • M. Warda

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Low-energy beta-delayed fission of 194,196At and 200,202Fr was studied in detail at the mass separator ISOLDE at CERN. The fission-fragment mass distributions of daughter nuclei 194,196Po and 202Rn indicate a triple-humped structure, marking the transition between asymmetric fission of 178,180Hg 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.


Original languageEnglish
Pages (from-to)1-6
JournalPhysical Review C
Issue number041301
Publication statusPublished - 15 Oct 2014


  • beta-delayed, fission, ISOLDE, CERN, francium, astatine

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