M1 Resonances in Unstable Magic Nuclei

Abstract

Within a microscopic approach which takes into account RPA configurations, the single-particle continuum and more complex $1p1h\otimes phonon$ configurations isoscalar and isovector M1 excitations for the unstable nuclei $56,78$Ni and $100,132$Sn are calculated. For comparison, the experimentally known M1 excitations in $40$Ca and ${}^{208}$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 $78$Ni and the neutron deficient nucleus $100$Sn.

17 pages (LATEX), 12 figures (available from the authors), KFA-IKP(TH)-1993-07

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• Measurements of the 48Ca(γ,n) Reaction
• Self-consistent calculations within the Extended Theory of Finite Fermi Systems
• M1 resonance in ${}^{208}$Pb within the self-consistent phonon-coupling model
• Role of residual interaction in the relativistic description of M1 excitation
• Optimizing phonon space in the phonon-coupling model
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• The evolution of magnetic dipole strength in ${}^{100-140}$ Sn isotope chain and quenching of nucleon g factors
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