Fission dynamics for capture reactions in 58,64ni + 208pb systems: New results in terms of thermal energy and neutron multiplicity correlated distributions


Autoria(s): Donadille, Laurent; Liatard, Eric E.; Désesquelles, Pierre; Bruandet, J.F. J.F.; Farget, Fanny F.; Fayot, J. J.; Perrin, G.; Santos, De D.; Schussler, Fabian F.; Viano, J. B.; Vignon, B. B.; Benoit, Bénédicte; Hanappe, Francis; Stuttge, Louise; Rudolf, Gérard; Bilwes, B. B.; Costa, G. G.; Dorvaux, O.; Guillaume, G. G.; Huck, Alexander; Tomaśevič, S. S.; Kozulin, E.M.; Lazarev, Yu Y.A.; Itkis, I.M.; Itkis, Mikhail; Kondratiev, N.A.; Oganessian, Yu.Ts.; Litnevsky, L.A. L.A.; Jokic, Stevan; Lecolley, François René; Lecolley, Jean François
Data(s)

01/08/1999

Resumo

The neutron multidetector DéMoN has been used to investigate the symmetric splitting dynamics in the reactions 58.64Ni + 208Pb 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 (EthCN) and the total neutron multiplicity (νtot), and between pre- and post-scission neutron multiplicities (νpre and νpost, respectively). The νpre distribution shape indicates the possible coexistence of fast-fission and fusion-fission for the system 58Ni + 208Pb (Ebeam = 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 ± 2512 × 1021 s-1, above the one-body dissipation limit. The corresponding fission time is τf = 40 ± 4620 × 10-21 s. © 1999 Elsevier Science B.V. All rights reserved.

SCOPUS: ar.j

info:eu-repo/semantics/published

Formato

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Identificador

uri/info:pii/S0375947499003061

http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/182537

Idioma(s)

en

Fonte

Nuclear physics. A, 656 (2

Palavras-Chave #Physique atomique et nucléaire #208Pb(64Ni, F), Ebeam = 5.89-7.38 A MeV #208Pb(58Ni, F), Ebeam = 6.50-8.86 A MeV #Measured fission fragments mass, kinetic energy distributions, neutron multiplicity
Tipo

info:eu-repo/semantics/article

info:ulb-repo/semantics/articlePeerReview

info:ulb-repo/semantics/openurl/article