110 research outputs found
Fully Microscopic Calculations for Closed-Shell Nuclei with Realistic Nucleon-Nucleon Potentials
The ground-state energy of the doubly magic nuclei 4He and 16O has been
calculated within the framework of the Goldstone expansion starting from modern
nucleon-nucleon potentials. A low-momentum potential V-low-k has been derived
from the bare potential by integrating out its high-momentum components beyond
a cutoff Lambda. We have employed a simple criterion to relate this cutoff
momentum to a boundary condition for the two-nucleon model space spanned by a
harmonic-oscillator basis. Convergence of the results has been obtained with a
limited number of oscillator quanta.Comment: 8 pages, 5 figures, talk given at 11th Conference on Problems in
Theoretical Nuclear Physics, Cortona, Italy, 11-14 October 200
Behavior of odd-even mass staggering around 132Sn
We have performed shell-model calculations of binding energies of nuclei
around Sn. The main aim of our study has been to find out if the
behavior of odd-even staggering across N=82 is explainable in terms of the
shell model. In our calculations, we have employed realistic low-momentum
two-body effective interactions derived from the CD-Bonn nucleon-nucleon
potential that have already proved quite successful in describing the
spectroscopic properties of nuclei in the Sn region. Comparison shows
that our results fully explains the trend of the experimental staggering.Comment: 3 pages, 1 figur
Particle-Hole Multiplets Near Closed Shells
We report here on a shell-model study of nuclei close to doubly magic 132Sn
and 100Sn focusing attention on particle-hole multiplets. In our study we make
use of realistic effective interactions derived from the CD-Bonn
nucleon-nucleon potential. We present results for the four nuclei 132Sb, 130Sb,
102In and 98Ag. Comparison shows that the calculated results are in very good
agreement with the experimental data available for these nuclei far from
stability. This supports confidence in the predictions of our calculations
which may stimulate, and be helpful to, future experiments.Comment: 9 pages, talk presented at the XXXVII Zakopane School of Physics
"Trends in Nuclear Physics", Zakopane, Poland, September 3-10, 2002. To be
published on Acta Physica Polonica
Proton-neutron multiplets in exotic 134Sb: testing the shell-model effective interaction
The experimental level structure of 134Sb is compared with the results of a
shell-model calculation in which the two-body matrix elements of the effective
interaction have been derived from the CD-Bonn nucleon-nucleon potential. The
experimental data, including the very low-lying first-excited 1- state, are
remarkably well reproduced by the theory. The results of this paper complement
those of our previous studies on 135Sb and 134Sn, showing that our effective
interaction is well suited to describe 132Sn neighbors beyond N=82. The various
terms which contribute to the matrix elements of the proton-neutron effective
interaction are examined and their relative importance is evidenced.Comment: 4 pages, 3 figures, published on Physical Review
g9/2 nuclei and neutron-proton interaction
We have performed shell-model calculations for nuclei below 100Sn, focusing
attention on the two N=Z nuclei 96Cd and 92Pd, the latter having been recently
the subject of great experimental and theoretical interest. We have considered
nuclei for which the 0g9/2 orbit plays a dominant role and employed a realistic
low-momentum two-body effective interaction derived from the CD-Bonn
nucleon-nucleon potential. This implies that no phenomenological input enters
our effective Hamiltonian. The calculated results for 92Pd are in very good
agreement with the available experimental data, which gives confidence in our
predictions for 96Cd. An analysis of the wave functions of both 96Cd and 92Pd
is performed to investigate the role of the isoscalar spin-aligned coupling.Comment: 7 pages, 6 figures, 4 tables, to be published in Physical Review
Evolution of single-particle states beyond Sn
We have performed shell-model calculations for the two one valence-neutron
isotones Te and Xe and the two one valence-proton isotopes
Sb. The main aim of our study has been to investigate the evolution
of single-particle states with increasing nucleon number. To this end, we have
focused attention on the spectroscopic factors and the effective
single-particle energies. In our calculations, we have employed a realistic
low-momentum two-body effective interaction derived from the CD-Bonn
nucleon-nucleon potential that has already proved quite successful in
describing the spectroscopic properties of nuclei in the Sn region.
Comparison shows that our results reproduce very well the available
experimental data. This gives confidence in the evolution of the
single-particle states 4 figures predicted by the present study.Comment: 7 pages, 4figures, submitted to Phys. Rev.
Shell-model study of exotic Sn isotopes with a realistic effective interaction
We report on a shell-model study of Sn isotopes beyond N=82 employing a
realistic effective interaction derived from the CD-Bonn nucleon-nucleon
potential renormalized through use of the V-low-k approach. At present, the
most exotic Sn isotope for which some experimental information exists is 134Sn
with an N/Z ratio of 1.68. It is the aim of our study to compare the results of
our calculations with the available experimental data and to make predictions
for the neighboring heavier isotopes which may be within reach of the next
generation of radioactive ion beam facilities. The very good agreement between
theory and experiment obtained for 134Sn gives confidence in the predictive
power of our realistic shell-model calculations.Comment: 6 pages, 3 figures, 2 tables, talk presented at 10th International
Spring Seminar on Nuclear Physics "New Quests in Nuclear Structure", Vietri
sul Mare, may 21-25, 2010. To be published on Journal of Physics Conference
Serie
Structure of Neutron-Rich Nuclei in the 132Sn Region
We report on a study of neutron-rich nuclei around 132Sn in terms of the
shell model employing a realistic effective interaction derived from the
CD-Bonn nucleon-nucleon potential. We present results for some Sb and Te
isotopes. Comparison shows that our results are in very good agreement with the
available experimental data supporting confidence in the predictions of our
calculations. This may stimulate experimental efforts to gain more information
on these nuclei lying well away from the valley of stability.Comment: 9 pages, 5 figure, talk presented at the 3rd International Conference
on Fission and Properties of Neutron-Rich Nuclei, Sanibel Island, Florida,
November 3-9 200
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