Analysis of Fusion–Fission Process with Neutron Evaporation in Superheavy Mass Region

Aritomo, Y.; Ohta, M.
June 2003
Physics of Atomic Nuclei;Jun2003, Vol. 66 Issue 6, p1105
Academic Journal
The fusion-fission process for the synthesis of superheavy elements is discussed on the basis of fluctuation-dissipation dynamics. Recently, experiments at Dubna on fission of superheavy nuclei were carried out, and the mass and total kinetic energy distributions of fission fragments were measured. The fusion-fission cross section was derived from the experiments. We analyze the data using a three-dimensional Langevin calculation. We present a clear understanding of the competition between the fusion and the quasifission. We emphasize that a one- or two-dimensional model of Langevin calculation is not sufficient to estimate the fusion cross section in the superheavy mass region. Also, experiments on the emission of neutrons in correlation with fission fragments were conducted. It is useful to investigate the fusion-fission dynamics. We take into account the neutron emission with a Langevin calculation and compare it with experimental data. Finally, we discuss the evaporation residue cross section for superheavy elements.


Related Articles


    There are only 3 methods for the production of heavy and superheavy (SH) nuclei, namely, a sequence of neutron capture and beta(-) decay, fusion reactions, and multinucleon transfer reactions. A macroscopic amount of the long-living SH nuclei located at the island of stability may be produced by...

  • Direct experimental evidence for very long fission times of super-heavy elements. Morjean, M.; Charvet, J. L.; Chbihi, A.; Chevallier, M.; Cohen, C.; Dauvergne, D.; Dayras, R.; Drouart, A.; Frankland, J. D.; Jacquet, D.; Kirsch, R.; Laget, M.; Lautesse, P.; L'Hoir, A.; Marchix, A.; Nalpas, L.; Parlog, M.; Ray, C.; Schmitt, C.; Stodel, C. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Jan2008, Vol. 46 Issue 1, p27 

    The blocking technique in single crystals has been applied to reaction time measurements for the 238U + Ge system at 6.1 MeV/nucleon. Backed up with a reaction mechanism analysis using the INDRA 4Ï€ detector, it provides a direct experimental evidence for Z = 124 compound nuclei living longer...

  • In situ synthesis of volatile carbonyl complexes with short-lived nuclides. Even, Julia; Ackermann, Dieter; Asai, Masato; Block, Michael; Brand, Holger; Nitto, Antonio; Düllmann, Christoph; Eichler, Robert; Fan, Fangli; Haba, Hiromitsu; Hartmann, Willi; Hübner, Annett; Heßberger, Fritz; Huang, Minqhiu; Jäger, Egon; Kaji, Daiya; Kanaya, Jumpei; Kaneya, Yusuke; Khuyagbaatar, Jadambaa; Kindler, Birgit // Journal of Radioanalytical & Nuclear Chemistry;Mar2015, Vol. 303 Issue 3, p2457 

    Rapid in situ formation of metal carbonyl complexes with short-lived nuclides has been demonstrated to be feasible with recoiling ions formed in nuclear fusion and fission reactions. These carbonyl complexes are highly volatile and can be transported rapidly in a gas-stream to counting or...

  • NUCLEI FROM "ISLAND OF STABILITY" OF SUPERHEAVY ELEMENTS. Oganessian, Yu. // Acta Physica Polonica B;Feb2012, Vol. 43 Issue 2, p167 

    The observation of atomic numbers Z that are 40% larger than that of Bi, the heaviest stable element, is an impressive extension of nuclear survival. Although the super heavy nuclei (SHN) are at the limits of Coulomb stability, shell stabilization lowers the ground-state energy, creates a...

  • Spontaneous fission of superheavy nuclei. GHERGHESCU, R; POENARU, D // Pramana: Journal of Physics;Sep2015, Vol. 85 Issue 3, p439 

    The macroscopic-microscopic method is extended to calculate the deformation energy and penetrability for binary nuclear configurations typical for fission processes. The deformed two-centre shell model is used to obtain single-particle energy levels for the transition region of two partially...

  • TEST OF APPROXIMATION USED IN DESCRIPTION OF NON-AXIAL HEXADECAPOLE SHAPES OF HEAVIEST NUCLEI. Sobiczewski, A.; Shvedov, L.; Kowal, M. // International Journal of Modern Physics E: Nuclear Physics;Feb2007, Vol. 16 Issue 2, p402 

    Approximation of description of non-axial hexadecapole deformations of heaviest nuclei, used for a long time in the past, is tested. A large, 5-dimensional deformation space is used for that. The analysis is done within a macro-micro approach. Two superheavy nuclei (262Sg and 284114), for which...

  • Investigation of di-nuclear systems as entrance channel to fusion. Heinz, S.; Comas, V.; Hofmann, S.; Ackermann, D.; Heredia, J.; Heßberger, F. P.; Khuyagbaatar, J.; Kindler, B.; Lommel, B.; Mann, R. // European Physical Journal A -- Hadrons & Nuclei;Feb2010, Vol. 43 Issue 2, p181 

    We investigated the capture stage and successive nucleon transfer from the projectile to the target in the superheavy system 6428Ni + 207 82Pb ( Zproj. + Ztarget = 110) . The target-like transfer products were detected at forward angles of (0±2) degrees, such, we selected nuclei resulting...

  • Superheavy Elements: Present Status and Near Future. Greiner, Walter; Zagrebaev, Valery // AIP Conference Proceedings;2009, Vol. 1197 Issue 1, p34 

    The possibilities for the extension of the periodic system into the islands of superheavy (SH) elements, to and beyond the neutron drip line and to the sectors of strangeness and antimatter are discussed in the paper. The multi-nucleon transfer processes in low-energy damped collisions of heavy...

  • CALCULATIONS OF THE FORMATION CROSS SECTIONS FOR SYNTHESIS OF Z = 114–118 NUCLEI IN 48Ca INDUCED REACTIONS. SIWEK-WILCZYŃSKA, K.; BOROWIEC, A.; WILCZYŃSKI, J. // International Journal of Modern Physics E: Nuclear Physics;Apr2009, Vol. 18 Issue 4, p1079 

    Calculations of the evaporation-residue cross sections for production of super-heavy elements of Z = 114–118 in hot fusion (3n and 4n) reactions induced by 48Ca projectiles on Pu, Am, Cm and Cf targets are presented. Results of calculations are compared with the cross sections measured by...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics