Dynamical restriction for a growing neck due to mass parameters in a dinuclear system

Abstract

Mass parameters for collective variables of a dinuclear system and strongly deformed mononucleus are microscopically formulated with the linear response theory making use of the width of single particle states and the fluctuation-dissipation theorem. For the relative motion of the nuclei and for the degree of freedom describing the neck between the nuclei, we calculate mass parameters with basis states of the adiabatic and diabatic two-center shell model. Microscopical mass parameters are found larger than the ones obtained with the hydrodynamical model and give a strong hindrance for a melting of the dinuclear system along the internuclear distance into a compound system. Therefore, the dinuclear system lives a long time enough comparable to the reaction time for fusion by nucleon transfer. Consequences of this effect for the complete fusion process are discussed.

22 pages, 7 figures, submitted to Nucl.Phys.A

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• Transport coefficients for shape degrees in terms of Cassini ovaloids
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• Progress of Quantum Molecular Dynamics model and its applications in Heavy Ion Collisions
• Microscopic dynamics simulations of heavy-ion fusion reactions induced by neutron-rich nuclei
• Dynamic study on fusion reactions for ${}^{40,48}$Ca+${}^{90,96}$Zr around Coulomb barrier
• Dynamical nucleus-nucleus potential and incompressibility of nuclear matter
• Energy-Dependence of Nucleus-Nucleus Potential and Friction Parameter in Fusion Reactions
• Mass parameters for relative and neck collective motions in heavy ion fusion reactions
• Dynamical mechanism of fusion hindrance in heavy ion collisions
• Shielding effects in fusion reactions of proton-halo nucleus
• Nuclear viscosity estimated by dynamics of neck formation in the early stage of nuclear collision