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HK: Fachverband Physik der Hadronen und Kerne
HK 57: Struktur und Dynamik von Kernen IX
HK 57.7: Talk
Thursday, March 24, 2011, 18:00–18:15, O-1
Strong M1 components in 3i− → 31− in nearly spherical nuclei: Evidence for isovector-octupole excitations — •Marcus Scheck1,2, Peter A. Butler2, Christoph Fransen3, Volker Werner4, and Steven W. Yates5,6 — 1IKP, TU-Darmstadt, 64289 Darmstadt, Germany — 2Dept. of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, UK — 3WNSL, Yale University, New Haven CT-06520-8120, USA — 4IKP, Universität zu Köln, 50937 Köln, Germany — 5Dept. of Physics and Astronomy, University of Kentucky, Lexington KY-40566-0055, USA — 6Dept. of Chemistry, University of Kentucky, Lexington KY-40506-0055, USA
An evaluation of data obtained in (n,n′γ) experiments reveals strong M1 3i− → 31− transitions in nuclei near the N=50 (92Zr, 94Mo and 96Mo), Z=50 (112Cd and 114Cd) and N=82 (144Nd) shell closures . The observed ⟨ 31− || M1 || 3i− ⟩ matrix elements scale with the ⟨ 21+ || M1 || 2ms+ ⟩ matrix elements, and the energy difference between the initial 3i− state and the 31− octupole phonon is proportional to the |⟨ 31−|| E3 ||0gs+⟩| matrix element. The possibility of assigning the states of interest as octupole mixed-symmetry states is discussed.