Fusion-fission and quasifission of superheavy systems with Z=110-116 formed in 48Ca-induced reactions
Kozulin, E. M., Knyazheva, G. N., Itkis, I. M., Itkis, M. G., Bogachev, A. A., Chernysheva, E. V., . . . Chubarian, G. (2014). Fusion-fission and quasifission of superheavy systems with Z=110-116 formed in 48Ca-induced reactions. Physical Review C, 90 (5), 054608. doi:10.1103/PhysRevC.90.054608
Published inPhysical Review C
© 2014 American Physical Society. Published in this repository with the kind permission of the publisher.
Background: In heavy-ion-induced reactions the mechanism leading to the formation of the compound nucleus and the role of quasifission is still not clear. Purpose: Investigation of the quasifission process of superheavy composite systems with Z = 110-116 and comparison with properties of fusion-fission and quasifission of lighter composite systems. Method: Mass and energy distributions of fissionlike fragments formed in the reactions 48Ca +232 Th, 238U, 244Pu, and 248Cm at energies near the Coulomb barrier have been measured using the double-arm time-of-flight spectrometer CORSET at the U-400 cyclotron of the FLNR JINR. Results: The most probable fragment masses as well as total kinetic energies and their dispersions in dependence on the interaction energies and ion-target combinations have been studied for asymmetric and symmetric fragments formed in the reactions. The capture cross sections were obtained for the reactions 48Ca +244 Pu and 248Cm. The lower limits for fission barriers of 283−286Cn, 289−292Fl, and 293−296Lv compound nuclei were estimated. Conclusions: Analysis of the properties of symmetric fragments has shown that a significant part of these fragments may be attributed to fusion-fission process for the reactions 48Ca+238U, 244Pu, and 248Cm. ...