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HK: Physik der Hadronen und Kerne

HK 30: Nuclear Physics / Spectroscopy IV

HK 30.1: Gruppenbericht

Mittwoch, 13. März 2002, 14:00–14:30, B

Intruder and Multi–Phonon States in ¹⁰⁸Cd — •A. Gade, P. von Brentano, J. Jolie, C. Fransen, A. Linnemann, and V. Werner — Institut für Kernphysik, Zülpicher Straße 77, 50937 Köln

The rare isotope ¹⁰⁸Cd was investigated using the powerful combination of two different experimental techniques: γγ–spectroscopy following the β–decay of ¹⁰⁸In and the non–selective (α,n) fusion evaporation reaction. This resulted in the observation of 120 new states and more than 580 new transitions, the determination of more than 80 multipole mixing ratios and eight effective lifetimes resulting from a DSA analysis in the fusion evaporation reaction.
The proton 2p–2h intruder band, which is typical for near proton–magic nuclei, was established up to the 4⁺ member including lower limits for the absolute transition strengths of inter– and intraband decays. The heavily suppressed absolute E2 transition strength out of the proposed intruder band indicates this band structure to be fairly pure. These findings are compared to neighboring Cd isotopes and related structures.
A further particularly interesting problem is the coupling of the lowest quadrupole and octupole modes in nuclei. We report on the observation of the complete quadrupole–octupole coupled quintuplet of negative parity (2₁⁺ ⊗ 3₁⁻)^(J−) in ¹⁰⁸Cd, the fourth complete quadrupole–octupole multiplet ever proposed. The energy splitting within the multiplet is calculated using a simple Hamiltonian which results in an analytical single–parameter description for the energies.
Partly supported by the DFG under contract Br799/10–1.