Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 43: Struktur und Dynamik von Kernen
HK 43.1: Gruppenbericht
Donnerstag, 22. März 2012, 16:30–17:00, P 4
Determination of the B(E3, 0+ → 3−) strength in the strongly octupole correlated nucleus 224Ra using Coulomb excitation at REX-ISOLDE — •Marcus Scheck1,2, Liam Paul Gaffney2, Peter Anthony Butler2, and Thorsten Kroell1 — 1TU Darmstadt — 2University of Liverpool
Exploiting the unique capabiltities of REX-ISOLDE to provide intense post-accelerated 224Ra radioactive ion beams we were able to Coulomb excite low-lying, low-spin levels of 224Ra. The previously accessible observables, such as the excitation energies of negative parity levels, and theoretical calculations using various models locate this nucleus to be situated in a mass-region with enhanced octupole correlations. Our collaboration was for the first time capable to Coulomb excite opposite parity levels in a post-accelerated radioactive nucleus. Indeed, apart from quasi-stable Uranium isotopes, 224Ra is the so far heaviest post-accelerated nucleus ever. A first, preliminary, B(E3, 0+ → 3−) value provides quantitative information about the octupole correlations in this nucleus. The results will be discussed within the context of a possible stable octupole deformation in the ground state of this nucleus. An observation, that is implicating a CP-violating nuclear Schiff moment. The latter has a strong impact on the search for CP-violating physics in the atomic system of the neighbouring odd-mass Ra-isotopes.
Financial support by the BMBF under grant 06DA9036I, HIC for FAIR and the ENSAR programme is gratefully acknowledged.