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  • 1985-1989  (2)
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  • 1
    ISSN: 1434-601X
    Keywords: 25.70.Cd ; 25.70.Lm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A dynamical model using three collective degrees of freedom: (r) — the distance between the center-of-mass of the nuclei, (gq) — the deflection angle and (x) — the mass-asymmetry, was applied to analyse deep inelastic collisions in a light cpmposite system19F(72 MeV) +14Mg. Two kinds of nuclear potentials, a proximity and a Woods-Saxon one, have been chosen to describe the nuclear interaction. To obtain a good prediction of the 1-critical values for fusion and a good description of the experimental angular distributions it was necessary to use much larger values of the coefficients for the friction tensor, as compared to the case of heavy composite systems. By comparing with experimental angular distributions it resulted that deep inelastic collisions in such light composite system correspond to a dissipated energy higher than 5 MeV. In the Wilczynski plots for such light composite system at about 1.3 MeV/u above the Coulomb barrier, a mixing of quasielastic and deep inelastic components was found in agreement with the experimental energy spectra. Based on theQ gg systematics, the calculated cross-sections d2 σ/dgq dA forA=16 gave a good estimation of the experimental angular distribution for theZ=8 element.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A model with two collective variables,r-the distance between nuclei andθ-the deflection angle in the center-of-mass system, was used. In the classical frame, the time evolution of the nuclear composite system confirmed the Wilczynski model. It was obtained that for the interacting system40Ar(300 MeV)+197Au, deep inelastic collisions correspond to 1-values in the range 126 ≦ 1 ≦ 210. This implies interaction times in the range 5×10−22 s to 3.4×10−21 s and energy losses from 30 to 160 MeV. The obtained 1cr value, 1cr=125 and the fusion cross section are in agreement with experimental data. Calculating the double differential cross sectiond 2σ/dθdE in the statistical formalism one obtains a qualitative agreement with experimental data. The introduction of statistical fluctuations in calculating the angular distributiondσ/dθ determines a good description of experimental data. The energy dissipation up to 130 MeV (deduced from Wilczynski plot) is in good agreement with experimental data.
    Type of Medium: Electronic Resource
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