Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 10: Structure and Dynamics of Nuclei II

HK 10.5: Vortrag

Montag, 26. Februar 2018, 17:45–18:00, HZO 70

Lifetime determination in 192,194,196 Hg via γ-γ fast-timing spectroscopy — •Arwin Esmaylzadeh, Jean-Marc Régis, Vasil Karayonchev, Lukas Knafla, Lisa Gerhard, and Jan Jolie — Insitut für Kernphysik, Universität zu Köln

Lifetimes of excited states in ^192,194,196Hg were measured using the Generalized Centroid Difference (GCD) method [1]. Three fusion evaporation reactions were used at the Cologne 10 MV Tandem accelerator: ¹⁸⁴W(¹²C,4n)¹⁹²Hg, ¹⁸⁶W(¹²C,4n)¹⁹⁴Hg and ¹⁹⁷Au(p,2n)¹⁹⁶Hg to populate the states of interest. To observe the γ-rays the HORUS spectrometer was equipped with eight HPGe- and nine LaBr₃(Ce) detectors. Lifetimes of 2₁⁺, 4₁⁺ and negative parity band member states were measured in all three nuclei. The experimental results were compared and discussed in the framework of the Interacting Boson Model (IBM). Two model calculations, i.e. IBM-Configuration Mixing (IBM-CM)[2] and IBM-2 [3] were used to describe the nuclei of interest. The two models calculations describe the properties of the nuclei within the experimental uncertainties.

Supported by DFG grant JO391/16-1

[1] J-M Régis et al., Nucl. Instrum. Methods Phys. Res. 726C (2013) [2] J. E. García-Ramos and K. Heyde, Phys. Rev. C, 89 (2014)
[3] K. Nomura, R. Rodriguez-Guzman, and L. Robledo, Phys. Rev. C 87 (2012)