München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 21: Structure and Dynamics of Nuclei III

HK 21.6: Vortrag

Dienstag, 19. März 2019, 15:30–15:45, HS 14

Direct lifetime measurements in ¹⁰⁴Pd — •Maximilian Droste, Peter Reiter, Konrad Arnswald, Robert Hetzenegger, Rouven Hirsch, Levent Kaya, Lars Lewandowski, Claus Müller-Gatermann, Michael Seidlitz, Burkhard Siebeck, and Kai Wolf — Institut für Kernphysik, Universität zu Köln

Coulomb excitation is a powerful tool to determine reduced transition probabilities of exotic nuclei far off stability. Therefore, the radioactive ion beam impinges onto target nuclei with well-known transition probabilities. Typically, unknown transition probabilities of the projectiles are determined relative to the established target values and detailed knowledge of standard target nuclei like ¹⁰⁴Pd is key. The B(E2:2⁺ → 0⁺) value of the first excited state in ¹⁰⁴Pd and the correlated quadruple moments have so far only been investigated via Coulomb excitation. A precise lifetime measurement, as a complementary approach to determine reduced transition strengths in ¹⁰⁴Pd and to minimize the systematic errors, was performed at the FN Tandem accelerator of the IKP Cologne employing the Recoil-Distance Doppler-Shift (RDDS) method. Excited states of ¹⁰⁴Pd were populated via the fusion evaporation reaction ⁹⁶Zr(¹²C,4n)¹⁰⁴Pd at 55 MeV upto 18 ℏ. Measured lifetimes in ¹⁰⁴Pd will be presented and reduced transition probabilities will be compared to Coulomb excitation results.