Evolution of fission-fragment mass distributions in the neutron-deficient lead region
L. GhysBelgian Nuclear Research Center SCK•CEN, Boeretang 200, B-2400 Mol, BelgiumA. N. AndreyevUniversity of the West of ScotlandM. HuyseKU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, BelgiumP. Van DuppenKU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, BelgiumS. SelsKU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, BelgiumB. AndelDepartement of Nuclear Physics and Biophysics, Comenius University, 84248 Bratislava, SlovakiaS. AntalicDepartement of Nuclear Physics and Biophysics, Comenius University, 84248 Bratislava, SlovakiaA. E. BarzakhPetersburg Nuclear Physics Institute, NRC Kurchatov Institute, Gatchina 188300, RussiaL. CapponiSchool of Engineering, University of the West of Scotland, Paisley, PA1 2BE, United KingdomT. E. CocoliosPH Departement, CERN, CH-1211 Geneve 23, SwitzerlandX. DerkxLPC, ENSICAEN, Université de Caen Basse Normandie, CNRS/IN2P3-ENSI, F-14050, FranceH. De WitteKU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, BelgiumJ. ElseviersKU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, BelgiumД. В. ФедоровPetersburg Nuclear Physics Institute, NRC Kurchatov Institute, Gatchina 188300, RussiaV. N. FedosseevEN Departement, CERN, CH-1211 Geneve 23, SwitzerlandF. P. HeßbergerGesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, GermanyZ. KalaninováDepartement of Nuclear Physics and Biophysics, Comenius University, 84248 Bratislava, SlovakiaU. KösterInstitut Laue Langevin, 71 avenue des Martyrs, F-38042 Grenoble Cedex 9, FranceJohn F. LaneSchool of Engineering, University of the West of Scotland, Paisley, PA1 2BE, United KingdomV. LiberatiSchool of Engineering, University of the West of Scotland, Paisley, PA1 2BE, United KingdomK. M. LynchPH Departement, CERN, CH-1211 Geneve 23, SwitzerlandB. A. MarshEN Departement, CERN, CH-1211 Geneve 23, SwitzerlandS. MitsuokaAdvanced Science Research Center, Japan Atomic Energy Agency, Tokai-Mura, Naka-gun, Ibaraki, 319-1195, JapanP. MöllerTheoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USAY. NagameAdvanced Science Research Center, Japan Atomic Energy Agency, Tokai-Mura, Naka-gun, Ibaraki, 319-1195, JapanK. NishioAdvanced Science Research Center, Japan Atomic Energy Agency, Tokai-Mura, Naka-gun, Ibaraki, 319-1195, JapanS. OtaAdvanced Science Research Center, Japan Atomic Energy Agency, Tokai-Mura, Naka-gun, Ibaraki, 319-1195, JapanD. PauwelsBelgian Nuclear Research Center SCK•CEN, Boeretang 200, B-2400 Mol, BelgiumR. D. PageDepartement of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomL. PopescuBelgian Nuclear Research Center SCK•CEN, Boeretang 200, B-2400 Mol, BelgiumD. RadulovKU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, BelgiumM. M. RajabaliKU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, BelgiumJ. RandrupNuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USAE. RapisardaPH Departement, CERN, CH-1211 Geneve 23, SwitzerlandS. RotheEN Departement, CERN, CH-1211 Geneve 23, SwitzerlandKirandeep SandhuSchool of Engineering, University of the West of Scotland, Paisley, PA1 2BE, United KingdomM. D. SeliverstovDepartment of Physics, University of York, York, YO10 5DD, United KingdomA. M. SjödinEN Departement, CERN, CH-1211 Geneve 23, SwitzerlandV. L. TruesdaleDepartment of Physics, University of York, York, YO10 5DD, United KingdomC. Van BeverenKU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, BelgiumP. Van den BerghKU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, BelgiumY. WakabayashiAdvanced Science Research Center, Japan Atomic Energy Agency, Tokai-Mura, Naka-gun, Ibaraki, 319-1195, JapanM. WardaInstitute of Physics, Marie Curie-Sklodowska University, pl. M. Curie-Sklodowskiej 1, 20-031 Lublin, Poland
2014en
ABI
Annotatsiya
Low-energy $\ensuremath{\beta}$-delayed fission of $^{194,196}\mathrm{At}$ and $^{200,202}\mathrm{Fr}$ was studied in detail at the mass separator ISOLDE at CERN. The fission-fragment mass distributions of daughter nuclei $^{194,196}\mathrm{Po}$ and $^{202}\mathrm{Rn}$ indicate a triple-humped structure, marking the transition between asymmetric fission of $^{178,180}\mathrm{Hg}$ 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.
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