1,674 research outputs found
Nuclear Liquid Drop Model with the Surface-Curvature Terms: New Perspectives for the Hyperdeformation Studies
Nuclear liquid drop model is revisited and an explicit introduction of the
surface-curvature terms is presented. The corresponding parameters of the
extended classical energy formula are adjusted to the contemporarily known
nuclear binding energies and fission barrier heights. Using 2766 binding
energies of nuclei with and it is shown that the
performance of the new approach is improved by a factor of about 6, compared to
the previously published liquid drop model results, in terms of both the masses
(new r.m.s. deviation MeV) and the fission barriers (new
r.m.s. deviation of the fission barriers of isotopes with is MeV).
The role of the curvature terms and their effects on the description of the
experimental quantities are discussed in detail; for comparison the parameters
of the more 'traditional' approaches are re-fitted taking into account the
nuclear masses known today and the performances of several variants of the
model are compared. The isospin dependence in the new description of the
barriers is in a good agreement with the extended Thomas-Fermi approach; it
also demonstrates a good qualitative agreement with the fission life-time
systematics tested on the long chain of Fermium isotopes known experimentally.
The new approach offers also a very high stability in terms of the
extrapolation from the narrower range of nuclides to a more extended one - a
property of particular interest for the contemporary exotic beam projects: the
corresponding properties are illustrated and discussed.Comment: 25 pages in LaTeX and 20 figures in eps forma
On Charged Mesoscopic Metallic Bubbles
We investigate the existence of stable charged metallic bubbles using the
shell correction method. We find that for a given mesoscopic system of n atoms
of a given metal and q less n (positive) elementary charges, a metallic bubble
turns out to have a lower total energy than a compact spherical cluster,
whenever the charge number q is larger than acritical charge number q_c. For a
magic number (n-q) of free electrons, the spherical metallic bubble may become
stable against fission.Comment: 14 pages in Latex and 5 figures in the eps forma
Shell Structure of Cesium Layer Covering the C60 Fullerene Core
Strutinsky shell corrections for the Cesium-coated fullerenes were
investigated. The single particle levels of electrons are obtained using the
spherical mean-field potential of a shifted Wood-Saxon type. The parameters of
the potential are adjusted to reproduce the experimental ionization energies of
the Cs(N) clusters and the magic numbers observed in their photo-ionization
spectra of the C60Cs(N) aggregates.Comment: 6 pages in LaTex, 7 eps figure
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