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  • 1975-1979  (3)
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  • 1
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The excitation functions for deep inelastic reactions in which two to six charges are transferred from40Ar and63Cu ions to rare earth targets have been measured using activation techniques, the observed radionuclides being150, 151Dy and149gTb. From the comparison of the curves relative to149gTb and those relative to150, 151Dy, it was deduced that the low spin isomer149gTb was produced with significant probability for low incident energies. Using data from (heavy ions,xn) reactions, it was possible to attribute this production to the deexcitation of Tb fragments formed in deep inelastic transfers with angular momenta lower than 9ħ. This result is in good agreement with the angular momentum calculations performed under the hypothesis that the initial angular momentum window leading to deep inelastic reactions is situated between the critical angular momentum for fusion and that corresponding to grazing collisions. As far as Cu induced reactions are concerned, both hypothesis of rolling and sticking are consistent with the experimental data. For Ar induced reactions, the results indicate that the stage of sticking is not reached when the incident energy is lower than 200 MeV. Nuclear Reactions:142, 145Nd,144, 148Sm,154Gd(Ar,X)151, 150Dy,149gTbE=160–280 MeV; measuredσ(E).144Nd,148Sm,151Eu,154Gd(Cu, X)151, 150Dy,149gTb.E=280–420 MeV measuredσ(E). Enriched targets. Deduced angular momentum of Tb fragments.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured for the 430 MeV86Kr+92.98Mo systems the triple differential cross sectiond 3 σ/dEdAdZ (E=kinetic energy,A=mass andZ=atomic number) of the reaction products in the angular range (θ=25, 45°). We focussed attention on a fast collective mode in deep inelastic reactions: the neutron excess or charge equilibration. This mode is shown to relax very quickly to equilibrium within a time scale of the order of 10−22s. It is shown that this collective degree of freedom exhibit a quantal behavior which can be seen in the observation of quantal fluctuations. The experimental results are discussed in terms of a simple equilibrium model. The giant dipole resonance of the composite system could be closely connected to this neutron excess mode.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An analysis of angular distributions for quasi-elastic transfer reactions is proposed. The formalism used is derived from the general treatment of multinucleon transfer in the limits of DWBA approximation. It appears that for heavy ions, the use of real potentials with real trajectories remains a good approximation in the window ofl space concerned with quasi-elastic transfer reactions. This analysis has been tested by a series of experimental data obtained by bombardment of209Bi targets by14N,16O,19F,40Ar and40Ca. For incident energies near the Coulomb barrier, the deflection angle depends strongly on the excitation energy of the system so that a window ofQ values leads to very wide angular distributions. A slow decrease of the radius parameter with the increase of theZ 1 Z 2 product has been observed. This result can be correlated by an interaction distance (d=2.7–3fm) between half density radii of the two colliding nuclei.
    Type of Medium: Electronic Resource
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