63 research outputs found
Core swelling in spherical nuclei: An indication of the saturation of nuclear density
Background: Nuclear radius is one of the most important and basic properties
of atomic nuclei and its evolution is closely related to the saturation of the
nuclear density in the internal region but the systematics of the nuclear radii
for the neutron-rich unstable nuclei is not well known.
Purpose: Motivated by the recent interaction cross section measurement which
indicates the 48Ca core swelling in the neutron-rich Ca isotopes, we explore
the mechanism of the enhancement of the neutron and proton radii for spherical
nuclei.
Methods: Microscopic Hartree-Fock calculations with three sets of Skyrme-type
effective interactions are performed for the neutron-rich Ca, Ni and Sn
isotopes. The total reaction cross sections for the Ca isotopes are evaluated
with the Glauber model to compare them with the recent cross section data.
Results: We obtain good agreement with the measured cross sections and charge
radii. The neutron and proton radii of the various "core" configurations are
extracted from the full Hartree-Fock calculation and discuss the core swelling
mechanism.
Conclusions: The core swelling phenomena occur depending on the properties of
the occupying valence single-neutron states to minimize the energy loss that
comes from the saturation of the densities in the internal region, which
appears to be prominent in light nuclei such as Ca isotopes.Comment: 6 pages, 4 figures, to appear in a Rapid Communication in Phys. Rev.
Probing neutron-skin thickness with total reaction cross sections
We analyze total reaction cross sections, , for exploring their
sensitivity to the neutron-skin thickness of nuclei. We cover 91 nuclei of O,
Ne, Mg, Si, S, Ca, and Ni isotopes. The cross sections are calculated in the
Glauber theory using the density distributions obtained with the
Skyrme-Hartree-Fock method in 3-dimensional coordinate space. Defining a
reaction radius, , to characterize the nuclear size
and target (proton or C) dependence, we find an empirical formula for
expressing with the point matter radius and the skin thickness, and
assess two practical ways of determining the skin thickness from proton-nucleus
values measured at different energies or from values
measured for different targets.Comment: 6 pages, 5 figures, to appear in Phys. Rev.
Can realistic interaction be useful for nuclear mean-field approaches?
Recent applications of the M3Y-type semi-realistic interaction to the nuclear
mean-field approaches are presented: (i) Prediction of magic numbers and (ii)
isotope shifts of nuclei with magic proton numbers. The results exemplify that
realistic interaction, which is derived from the base and
interaction, furnish a new theoretical instrument for advancing nuclear
mean-field approaches.Comment: 9 pages including 6 figures, published in EPJA 52, 185 (2016
Mean-field approach to superdeformed high-spin states in 40Ca and neutron-rich 50S regions
With the use of the symmetry-unrestricted cranked SHF method in the 3D
coordinate-mesh representation, a systematic search for the SD and HD
rotational bands in the N=Z nuclei from 32S to 48Cr has been done, and SD and
HD solutions have been found in 32S, 36Ar, 40Ca, 44Ti, and in 36Ar, 40Ca, 44Ti,
48Cr, respectively. The SD band in 40Ca is found to be extremely soft against
both the axially symmetric (Y30) and asymmetric (Y31) octupole deformations.
Possible presense of SD states in neutron-rich sulfur isotopes from 46S to 52S
has also been investigated, and deformation properties of neutron skins both in
the ground and SD states are discussed.Comment: 10 pages including 9 ps figures, Talk at International Symposium on
"Frontiers of Collective Motion 2002", November 6-9, 2002, Univ. of Aizu,
Japa
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