Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-09-14
J.Phys. G32 (2006) 2245-2260
Physics
Nuclear Physics
Nuclear Theory
19 pages, 12 figures, Accepted for publication in J. Phys. G
Scientific paper
10.1088/0954-3899/32/11/016
The fusion-fission process accompanied by neutron emission is studied in the superheavy-mass region on the basis of the fluctuation-dissipation model combined with a statistical model. The calculation of the trajectory or the shape evolution in the deformation space of the nucleus with neutron emission is performed. Each process (quasi-fission, fusion-fission, and deep quasi-fission processes) has a characteristic travelling time from the point of contact of colliding nuclei to the scission point. These dynamical aspects of the whole process are discussed in terms of the pre-scission neutron multiplicity, which depends on the time spent on each process. We have presented the details of the characteristics of our model calculation in the reactions $^{48}$Ca+$^{208}$Pb and $^{48}$Ca+$^{244}$Pu, and shown how the structure of the distribution of pre-scission neutron multiplicity depends on the incident energy.
Aritomo Yoshihiro
Hanappe Francis
Ohta Masayuki
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