Münster 2011 – scientific programme

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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 3_i⁻ → 3₁⁻ in nearly spherical nuclei: Evidence for isovector-octupole excitations — •Marcus Scheck^1,2, Peter A. Butler², Christoph Fransen³, Volker Werner⁴, and Steven W. Yates^5,6 — 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 3_i⁻ → 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 || 3_i⁻ ⟩ matrix elements scale with the ⟨ 2₁⁺ || M1 || 2_ms⁺ ⟩ matrix elements, and the energy difference between the initial 3_i⁻ state and the 3₁⁻ octupole phonon is proportional to the |⟨ 3₁⁻|| E3 ||0_gs⁺⟩| matrix element. The possibility of assigning the states of interest as octupole mixed-symmetry states is discussed.