2,579 research outputs found
Structure of particle-hole nuclei around 100Sn
We have performed shell-model calculations for the three odd-odd nuclei
100In, 102In, and 98Ag, with neutron particles and proton holes around 100Sn.
We have used a realistic effective interaction derived from the CD-Bonn
nucleon-nucleon potential, the neutron-proton channel being explicitly treated
in the particle-hole formalism. Particular attention has been focused on the
particle-hole multiplets, which are a direct source of information on the
neutron-proton effective interaction. We present our predictions for the two
lowest lying multiplets in 100In, for which no spectroscopic data are yet
available. For 98Ag and 102In comparison shows that our results are in very
good agreement with the available experimental data.Comment: 5 pages, published in Physical review
Realistic Shell-Model Calculations for Nuclei in the Region of Shell Closures off Stability
We have performed realistic shell-model calculations for nuclei around doubly
magic 100Sn and 132Sn using an effective interaction derived from the Bonn A
nucleon-nucleon potential. The results are in remarkably good agreement with
the experimental data showing the ability of our effective interaction to
provide an accurate description of nuclear structure properties.Comment: 6 pages, 6 figures, Proceedings of the SNEC98 Conference, to be
published on Nuovo Cimento
Effects of neutron-proton interaction in doubly odd deformed nuclei
We have investigated the effects of the neutron-proton interaction in several
doubly odd deformed nuclei within the framework of the particle-rotor model. In
this paper, we show some selected results of our study which evidence the
importance of the tensor-force effects.Comment: Contributed paper at "High Spin Physics 2001", see
http://www.fuw.edu.pl/~hs2001/, to be published in Acta Physica Polonica B,
see http://th-www.if.uj.edu.pl/acta/index.htm
Pairing and realistic shell-model interactions
This paper starts with a brief historical overview of pairing in nuclei,
which fulfills the purpose of properly framing the main subject. This concerns
the pairing properties of a realistic shell-model effective interaction which
has proved very successful in describing nuclei around doubly magic 132Sn. We
focus attention on the two nuclei 134Te and 134Sn with two valence protons and
neutrons, respectively. Our study brings out the key role of one particle-one
hole excitations in producing a significant difference between proton and
neutron pairing in this region
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.
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
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