Light-particle emission from the fissioning nuclei 126 Ba, 188 Pt and 266,272,278 110: theoretical predictions and experimental results

• Published in: Nuclear physics. A 2000-11, Vol.679 (1), p.25-53
• Main Authors: Pomorski, K, Nerlo-Pomorska, B, Surowiec, A, Kowal, M, Bartel, J, Dietrich, K, Richert, J, Schmitt, C, Benoit, B, de Goes Brennand, E, Donadille, L, Badimon, C
• Format: Article
• Language: English
• Subjects: 107Ag( 19F , X) , E=128,148 MeV; 154Sm( 34S , X) , E=160,203 MeV; 172Yb( 16O , X) , E=138 MeV; 208Pb( 58Ni , X) , ( 64Ni , X) , 232Th( 40Ca , X) , 238U( 40Ar , X) , E=66 –186 MeV; Calculated fusion, fission σ( L) , prefission particle multiplicities; Comparisons with data; Deduced entrance channel effects; Nuclear reactions98Mo( 28Si , X) , E=166,187,204 MeV
• ISSN: 0375-9474
• DOI: 10.1016/S0375-9474(00)00327-4

We present a comparison of our model treating fission dynamics in conjunction with light-particle ( n, p, α ) evaporation with the available experimental data for the nuclei 126 Ba, 188 Pt and three isotopes of the element Z=110 . The dynamics of the symmetric fission process is described through the solution of a classical Langevin equation for a single collective variable characterizing the nuclear deformation along the fission path. A microscopic approach is used to evaluate the emission rates for prefission light particles. Entrance-channel effects are taken into account by generating an initial spin distribution of the compound nucleus formed by the fusion of two deformed nuclei with different relative orientations.