CERN Accelerating science

Article
Title	Evolution of fission-fragment mass distributions in the neutron-deficient lead region
Author(s)	Ghys, L (Leuven U. ; SCK-CEN, Mol) ; Andreyev, A N (York U., England ; JAEA, Ibaraki ; West Scotland U.) ; Huyse, M (Leuven U.) ; Van Duppen, P (Leuven U.) ; Sels, S (Leuven U.) ; Andel, B (Comenius U.) ; Antalic, S (Comenius U.) ; Barzakh, A (St. Petersburg, INP) ; Capponi, L (West Scotland U.) ; Cocolios, T E (CERN ; Manchester U.) ; Derkx, X (West Scotland U. ; Caen U.) ; De Witte, H (Leuven U.) ; Elseviers, J (Leuven U.) ; Fedorov, D V (St. Petersburg, INP) ; Fedosseev, V N (CERN) ; Hessberger, F P (Darmstadt, GSI ; Helmholtz Inst., Mainz) ; Kalaninová, Z (Comenius U.) ; Köster, U (Laue-Langevin Inst.) ; Lane, J F W (West Scotland U.) ; Liberati, V (West Scotland U.) ; Lynch, K M (CERN ; Manchester U.) ; Marsh, B A (CERN) ; Mitsuoka, S (JAEA, Ibaraki) ; Möller, P (Los Alamos Natl. Lab., Theor. Div.) ; Nagame, Y (JAEA, Ibaraki) ; Nishio, K (JAEA, Ibaraki) ; Ota, S (JAEA, Ibaraki) ; Pauwels, D (SCK-CEN, Mol) ; Page, R D (Liverpool U.) ; Popescu, L (SCK-CEN, Mol) ; Radulov, D (Leuven U.) ; Rajabali, M M (Leuven U.) ; Randrup, J (LBNL, NSD) ; Rapisarda, E (CERN) ; Rothe, S (CERN ; Mainz U., Inst. Phys.) ; Sandhu, K (West Scotland U.) ; Seliverstov, M D (Leuven U. ; York U., England ; West Scotland U. ; St. Petersburg, INP) ; Sjödin, A M (CERN) ; Truesdale, V L (York U., England) ; Van Beveren, C (Leuven U.) ; Van den Bergh, P (Leuven U.) ; Wakabayashi, Y (JAEA, Ibaraki ; Nishina Ctr., RIKEN) ; Warda, M (Lublin, Curie U.)
Publication	2014
Number of pages	6
In:	Phys. Rev. C 90 (2014) 041301
DOI	10.1103/PhysRevC.90.041301
Subject category	Nuclear Structure ; Nuclear Physics - Experiment
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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