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New Type of Asymmetric Fission in Proton-Rich Nuclei

A. N. AndreyevSchool of Engineering, University of the West of Scotland, Paisley, PA1 2BE, United Kingdom, and the Scottish Universities Physics Alliance (SUPA)J. ElseviersInstituut voor Kern- en Stralingsfysica, K.U. Leuven, University of Leuven, B-3001 Leuven, BelgiumM. HuyseInstituut voor Kern- en Stralingsfysica, K.U. Leuven, University of Leuven, B-3001 Leuven, BelgiumP. Van DuppenInstituut voor Kern- en Stralingsfysica, K.U. Leuven, University of Leuven, B-3001 Leuven, BelgiumS. AntalicDepartment of Nuclear Physics and Biophysics, Comenius University, Bratislava, SK-84248, SlovakiaA. E. BarzakhPetersburg Nuclear Physics Institute, 188350 Gatchina, RussiaN. BreeInstituut voor Kern- en Stralingsfysica, K.U. Leuven, University of Leuven, B-3001 Leuven, BelgiumT. E. CocoliosInstituut voor Kern- en Stralingsfysica, K.U. Leuven, University of Leuven, B-3001 Leuven, BelgiumV. F. ComasJ. DirikenInstituut voor Kern- en Stralingsfysica, K.U. Leuven, University of Leuven, B-3001 Leuven, BelgiumД. В. ФедоровPetersburg Nuclear Physics Institute, 188350 Gatchina, RussiaV. N. FedosseevISOLDE, CERN, CH-1211 Geneve 23, SwitzerlandS. FranchooInstitut National de Physique Nucléaire et de Physique des ParticulesJ. A. HerediaO. IvanovInstituut voor Kern- en Stralingsfysica, K.U. Leuven, University of Leuven, B-3001 Leuven, BelgiumU. KösterInstitut Laue Langevin, 6 rue Jules Horowitz, F-38042 Grenoble Cedex 9, FranceB. A. MarshISOLDE, CERN, CH-1211 Geneve 23, SwitzerlandK. NishioAdvanced Science Research Center, Japan Atomic Energy Agency (JAEA), Tokai-mura, Naka-gun, Ibaraki, 319-1195, JapanR. D. PageDepartment of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United KingdomN. PatronisDepartment of Physics, University of Ioannina, GR-45110 Ioannina, GreeceM. D. SeliverstovPetersburg Nuclear Physics Institute, 188350 Gatchina, RussiaI. TsekhanovichSchool of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, United KingdomP. Van den BerghInstituut voor Kern- en Stralingsfysica, K.U. Leuven, University of Leuven, B-3001 Leuven, BelgiumJ. Van de WalleISOLDE, CERN, CH-1211 Geneve 23, SwitzerlandM. VenhartDepartment of Nuclear Physics and Biophysics, Comenius University, Bratislava, SK-84248, SlovakiaS. VermoteDepartment of Physics and Astronomy, University of Gent, Proeftuinstraat 86, B-9000 Gent, BelgiumM. VeselskýInstitute of Physics of the Slovak Academy of SciencesC. WagemansDepartment of Physics and Astronomy, University of Gent, Proeftuinstraat 86, B-9000 Gent, BelgiumTakatoshi IchikawaYukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, JapanAkira IwamotoAdvanced Science Research CenterP. MöllerTheoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USAArnold J. SierkTheoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

2010en

Ochiq kirishBronza

ABI

Annotatsiya

A very exotic process of $\ensuremath{\beta}$-delayed fission of $^{180}\mathrm{Tl}$ is studied in detail by using resonant laser ionization with subsequent mass separation at ISOLDE (CERN). In contrast to common expectations, the fission-fragment mass distribution of the post-$\ensuremath{\beta}$-decay daughter nucleus $^{180}\mathrm{Hg}$ ($N/Z=1.25$) is asymmetric. This asymmetry is more surprising since a mass-symmetric split of this extremely neutron-deficient nucleus would lead to two $^{90}\mathrm{Zr}$ fragments, with magic $N=50$ and semimagic $Z=40$. This is a new type of asymmetric fission, not caused by large shell effects related to fragment magic proton and neutron numbers, as observed in the actinide region. The newly measured branching ratio for $\ensuremath{\beta}$-delayed fission of $^{180}\mathrm{Tl}$ is $3.6(7)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}%$, approximately 2 orders of magnitude larger than in an earlier study.

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DOI: 10.1103/physrevlett.105.252502

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