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HK: Fachverband Physik der Hadronen und Kerne

HK 38: Structure and Dynamics of Nuclei VIII

HK 38.4: Vortrag

Mittwoch, 13. März 2024, 16:45–17:00, HBR 14: HS 4

Investigation of low-lying states in ²¹⁴Po and ²¹⁴Bi — •Arwin Esmaylzadeh¹, Mario Ley¹, Vasil Karayonchev², Lukas Knafla¹, Andreas Harter¹, Franziskus von Spee¹, Christoph Fransen¹, Andrey Blazhev¹, Jan Jolie¹, and Casper-David Lakenbrink¹ — ¹Universität zu Köln, Institut für Kernphysik — ²Argonne National Laboratory

Lifetimes of low-energy excited states in even-even nuclei in the region around and above ²⁰⁸Pb are difficult to measure, because most of the nuclei in this region cannot be populated by fusion evaporation reactions. Therefore, a seven-day measurement of the standard ²²⁶Ra source was performed at the HORUS spectrometer equipped with eight HPGe and six LaBr detectors. In this measurement, the lifetimes 2₁⁺, 4₁⁺, 3₁⁻, 2₂⁺, 0₂⁺, 2₅^{+ 214}Po and the 1⁻ state in ²¹⁴Bi were determined employing the fast-timing method. Furthermore, upper limits for the 2₃⁺ and 1₁⁺ states in ²¹⁴Po and for the (0₁⁻, 1₁⁻) state in ²¹⁴Bi were obtained. The lifetimes and upper limits were used to calculated transition strengths to explain structural phenomena in these nuclei. The transition strengths were also compared to shell model calculations using the appraisal of Kuo-Herling interaction [1]

[1] E. K. Warburton and B. A. Brown, Phys. Rev. C 43, 602 (1991)

Keywords: Lifetime measurements; Transition strength; Nuclear structure