Shell-correction approach to nuclear state densities and the competition between fission and neutron emission of 210Po
1977; Elsevier BV; Volume: 278; Issue: 1 Linguagem: Inglês
10.1016/0375-9474(77)90182-8
ISSN1873-1554
AutoresP.A. Gottschalk, T. Ledergerber,
Tópico(s)Astronomical and nuclear sciences
ResumoStarting from the Hartree-Fock approximation to the grand canonical partition function we formulate a consistent renormalization of the ground-state energy and the intrinsic state density as a function of deformation. The competition between fission and neutron emission, ΓfΓn(E), of 210Po is studied within the framework of the statistical theory as an example. Calculations using renormalized state densities are compared with usual shell-model calculations and experimental data. We find that the usual calculations reflect the incorrect uniform deformamation dependence of the shell-model spectral function. As important changes due to renormalization we find: there is a rapid change of the shape of the transition state at ≈ 45 MeV excitation energy, ΓfΓn(E) remains smaller than unity for all excitation energies and the deformation of the transition state increases after the “shape transition” at 45 MeV monotonically towards the liquid drop saddle-point deformation.
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