Fission of heavy and superheavy nuclei at low excitation energies

✍ Scribed by M.G. Itkis; L. Calabretta; F. Hanappe; Yu.M. Itkis; A. Kelic; N.A. Kondratiev; E.M. Kozulin; Yu.Ts. Oganessian; I.V. Pokrovsky; E.V. Prokhorova; G. Rudolf; A.Ya. Rusanov; L. Stuttge

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 451 KB
• Volume: 654
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(00)88563-2

✦ Synopsis

The talk presents the results of an investigation of the main characteristics (mass and energy distributions of fission fragments and multiplicity of neutrons) of the fission of the 220 226 256 270 286

nuclei of Ra, Th, No, Sg, 112 produced in reactions with ions of ~80, =Ne and 48Ca at energies close to and essentially below the Coulomb barrier. The data obtained show that the form of the mass and energy distributions of the fission fragments of 226Th and 27°Sg is accounted for by the multimodal nature of the fission. In addition, for e26Th, a new phenomenon was established: there is a significant difference between the numbers of prescission neutrons for symmetric and asymmetric fission modes. It was found that, for the low-energy fission of the nucleus of 286l 12, the mass distribution of the fragments is of a clear-cut asymmetric form, contrary to what is observed for the spotaneous fission of the nuclei with Z = 100-104 and for the induced fission of 27°Sg.