Regular Article - Nuclear Structure and Reactions
Do we understand the electric quadrupole strength distributions in magic nuclei?
Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, D-64289, Darmstadt, Germany
* e-mail: firstname.lastname@example.org
Accepted: 27 November 2006
Published online: 9 January 2007
A comparison between the electric quadrupole (E2) strength distributions in 40, 48Ca with new results from 52Cr is presented. The deduced E2 strength distributions and the exhaustion of the isoscalar energy-weighted E2 sum rule are very different. Microscopic approaches fail to reproduce these differences. A survey of the available data shows that the exhaustion of the energy-weighted isoscalar E2 sum rule in doubly magic nuclei below the isoscalar giant quadrupole resonance is typically more than two times larger than in semi-magic nuclei. On the other hand, the E2 strength in this energy region exhausts about 50% of the total E2 strength, independent from shell closures.
PACS: 21.10.-k Properties of nuclei; nuclear energy levels – / 21.60.-n Nuclear structure models and methods – / 25.20.Dc Photon absorption and scattering –
© Società Italiana di Fisica and Springer-Verlag, 2007