7 research outputs found
M1 Resonances in Unstable Magic Nuclei
Within a microscopic approach which takes into account RPA configurations,
the single-particle continuum and more complex
configurations isoscalar and isovector M1 excitations for the unstable nuclei
Ni and Sn are calculated. For comparison, the
experimentally known M1 excitations in Ca and Pb have also been
calculated. In the latter nuclei good agreement in the centroid energy, the
total transition strength and the resonance width is obtained. With the same
parameters we predict the magnetic excitations for the unstable nuclei. The
strength is sufficiently concentrated to be measurable in radioactive beam
experiments. New features are found for the very neutron rich nucleus Ni
and the neutron deficient nucleus Sn.Comment: 17 pages (LATEX), 12 figures (available from the authors),
KFA-IKP(TH)-1993-0
Shell-model Monte Carlo studies of fp-shell nuclei
We study the gross properties of even-even and nuclei with
using shell-model Monte Carlo methods. Our calculations account for all configurations in the -shell and employ the modified
Kuo-Brown interaction KB3. We find good agreement with data for masses and
total strengths, the latter employing effective charges and
. The calculated total Gamow-Teller strengths agree consistently
with the -values deduced from data if the shell model results
are renormalized by , as has already been established for -shell
nuclei. The present calculations therefore suggest that this renormalization
(i.e., in the nuclear medium) is universal.Comment: 20 pages, 7 figures, Caltech Preprint