Level density and collective enhancement factor of a compound nucleus in non-adiabatic approach
European Physical Journal A(2014)
摘要
In this paper a simple statistical formalism that takes into account the diabatic motion of a compound system to calculate
total level density is given. The diabatic motion is introduced by coupling the adiabatic collective motion to an environment
consisting of intrinsic degrees of freedom. The collective enhancement of level density is studied. It has anadiabatical coefficient that depends only on the excitation energy and adynamical one that depends on the excitation energy and the coupling between intrinsic and collective modes. Qualitatively, the coefficients
of the vibrational enhancement factor forA=240 have been studied. The coupling is understood as the initial effect of the oscillatory motion of the mass asymmetry of
fragments on the nucleonic motion. The damping effect of the vibrational motion is taken into account considering the collective
motion of the fragments as a zero-sound wave propagating in the Fermiliquid. The intrinsic state in the framework of the Fermi
Gas Model (FGM) is described. The Pashkevich’s parametrization is used to describe the binary decay of the compound nucleus.
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