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HK: Fachverband Physik der Hadronen und Kerne

HK 56: Poster - Struktur und Dynamik von Kernen

HK 56.2: Poster

Mittwoch, 6. März 2013, 16:45–19:00, HSZ 4.OG

Study of the γ-decay behavior of (2⁺⊗ 3⁻)_1⁻ candidates with the γ³ setup at HIγS — •Anne Sauerwein¹, Vera Derya¹, Janis Endres¹, Andreas Hennig¹, Bastian Löher^2,3, Deniz Savran^2,3, Werner Tornow⁴, and Andreas Zilges¹ — ¹Institut für Kernphysik, Universität zu Köln — ²ExtreMe Matter Institute EMMI and Research Division, GSI — ³Frankfurt Institute for Advanced Studies — ⁴Department of Physics, Duke University, USA

Vibrational excitations in atomic nuclei can be described within the scope of the harmonic phonon-model. The coupling of a quadrupole phonon with an octupole phonon leads to a quintuplet of negative-parity states, including the two-phonon J^π=1⁻ state. A direct test of the two-phonon character is the study of the γ decay into constituent one-phonon excitations, and the comparison of their reduced transition strengths to model predictions. The high-efficiency γ³ setup at the High Intensity γ-ray Source facility was used, in order to investigate the γ-decay behavior of (2⁺⊗ 3⁻)_1⁻ candidates in ⁴⁰Ca and ¹⁴⁰Ce. A detector-array consisting of four High-Purity Germanium detectors, four 3" LaBr detectors and three 1.5" LaBr detectors was used for γ-ray detection. The data acquisition is capable of storing γ-γ coincidence events as well as singles events, allowing for the determination of γ-decay branching ratios.

Supported by the DFG (ZI 510/4-2) and the Alliance Program of the Helmholtz Association (HA216/EMMI). A.S., V.D., and A.H. are members of the Bonn-Cologne Graduate School of Physics and Astronomy.