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

Lars Ghys, Andrei N Andreyev, Xavier Derkx, Hilde De Witte, Jytte Elseviers, Dima V Fedorov, Valentin N Fedosseev, Fritz P Hessberger, Zdenka Kalaninová, Ulli Köster, Valentina Liberati, Kara Marie Lynch, Mark Huyse, Bruce Allan Marsh, S Mitsuoka, Peter Möller, Y Nagame, K Nishio, S Ota, Dieter PauwelsRobert D Page, Lucia Popescu, Deyan Radulov, Piet Van Duppen, Mustafa M Rajabali, J Randrup, Elisa Rapisarda, Sebastian Rothe, K Sandhu, Maxim D Seliverstov, A Marica Sjödin, Victoria A Truesdale, Céline Van Beveren, Paul Van den Bergh, Simon Sels, Y Wakabayashi, M Warda, Boris Andel, Stanislav Antalic, Anatoly Barzakh, L Capponi, Thomas Elias Cocolios

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Low-energy β-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 178,180 Hg 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
    Article number041301(R)
    JournalPhysical Review C (Nuclear Physics)
    Volume90
    DOIs
    Publication statusPublished - 15 Oct 2014

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