Fission dynamics for capture reactions in $^{58,64}$Ni + $^{208}$Pb systems : new results in terms of thermal energy and neutron multiplicity correlated distributions - Archive ouverte HAL Access content directly
Journal Articles Nuclear Physics A Year : 1999

Fission dynamics for capture reactions in $^{58,64}$Ni + $^{208}$Pb systems : new results in terms of thermal energy and neutron multiplicity correlated distributions

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B. Benoit
  • Function : Author
F. Hanappe
  • Function : Author
E.M. Kozulin
  • Function : Author
Yu.A. Lazarev
  • Function : Author
L.A. Litnevsky
  • Function : Author
I. Itkis
  • Function : Author
M.G. Itkis
  • Function : Author
S. Jokic
  • Function : Author
N.A. Kondratiev
  • Function : Author
F.R. Lecolley
  • Function : Author
  • PersonId : 941190
Yu.Ts. Oganessian
  • Function : Author
S. Tomasevic
  • Function : Author

Abstract

The neutron multidetector DéMoN has been used to investigate the symmetric splitting dynamics in the reactions 58,64 Ni + 208 Pb with excitation energies ranging from 65 to 186 MeV for the composite system. An analysis based on the new backtracing technique has been applied on the neutron data to determine the two-dimensional correlations between the parent composite system initial thermal energy ( E CN th ) and the total neutron multiplicity ( ν tot ), and between pre- and post-scission neutron multiplicities ( ν pre and ν post , respectively). The ν pre distribution shape indicates the possible coexistence of fast-fission and fusion-fission for the system 58 Ni + 208 Pb ( E beam = 8.86 A MeV). The analysis of the neutron multiplicities in the framework of the combined dynamical statistical model (CDSM) gives a reduced friction coefficient β = 23 ± 12 25 × 10 21 s −1 , above the one-body dissipation limit. The corresponding fission time is τ f = 40 ± 20 46 × 10 −21 s . (Elsevier)

Dates and versions

in2p3-00002805 , version 1 (06-09-1999)

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Cite

L. Donadille, E. Liatard, B. Benoit, F. Hanappe, L. Stuttge, et al.. Fission dynamics for capture reactions in $^{58,64}$Ni + $^{208}$Pb systems : new results in terms of thermal energy and neutron multiplicity correlated distributions. Nuclear Physics A, 1999, 656, pp.259-283. ⟨10.1016/S0375-9474(99)00306-1⟩. ⟨in2p3-00002805⟩
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