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

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 sy...

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Detalles Bibliográficos
Autores principales: Ghys, L, Andreyev, A N, Huyse, M, Van Duppen, P, Sels, S, Andel, B, Antalic, S, Barzakh, A, Capponi, L, Cocolios, T E, Derkx, X, De Witte, H, Elseviers, J, Fedorov, D V, Fedosseev, V N, Hessberger, F P, Kalaninová, Z, Köster, U, Lane, J F W, Liberati, V, Lynch, K M, Marsh, B A, Mitsuoka, S, Möller, P, Nagame, Y, Nishio, K, Ota, S, Pauwels, D, Page, R D, Popescu, L, Radulov, D, Rajabali, M M, Randrup, J, Rapisarda, E, Rothe, S, Sandhu, K, Seliverstov, M D, Sjödin, A M, Truesdale, V L, Van Beveren, C, Van den Bergh, P, Wakabayashi, Y, Warda, M
Lenguaje:eng
Publicado: 2014
Materias:
Nuclear Structure
Nuclear Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevC.90.041301
http://cds.cern.ch/record/2120786
Descripción
Sumario: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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