SMuK 2023 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Structure and Dynamics of Nuclei VII

HK 41.4: Talk

Wednesday, March 22, 2023, 16:45–17:00, SCH/A118

First direct lifetime determination of the 2₁⁺ state of ²¹⁰Pb — •C. M. Nickel¹, M. Beckers², D. Bittner², A. Blazhev², A. Esmaylzadeh², B. Falk², C. Fransen², J. Garbe², L. Gerhard², K. Geusen², A. Goldkuhle², K. E. Ide¹, P. R. John¹, J. Jolie², V. Karayonchev², R. Kern¹, E. Kleis², L. Klöckner², M. Ley², N. Pietralla¹, G. Rainovski³, F. Spee², M. Steffan², T. Stetz¹, V. Werner¹, and J. Wiederhold¹ — ¹TU Darmstadt — ²U Cologne — ³U Sofia

The investigation of transitions from the 2₁⁺ to the g.s. in nuclei close to the doubly-magic ²⁰⁸Pb allows to constrain parameters from nuclear models, e.g. the effective charges of the shell model. Nuclei containing two valence nucleons, like ²¹⁰Pb, are of particular importance [1], as their fundamental excitations form the low-lying nuclear states. The 2₁⁺ state of ²¹⁰Pb was directly populated in a two neutron transfer reaction at the 10 MV FN Tandem Accelerator at the IKP of the University of Cologne. Its lifetime was measured using the Cologne plunger device and the RDDS method. The gamma radiation was detected with HPGe detectors and the back-scattered beam-like particles with silicon detectors. Corrections for contaminants were performed and, thus, for the first time the lifetime of the 2₁⁺ state of ²¹⁰Pb was directly determined, being consistent with, but considerably more precise than, the only existing literature value obtained from triton scattering [2].

[1] D. Kocheva et al., Eur. Phys. J. A 53, 175 (2017).

[2] C. Ellegaard et al., Nucl. Phys. A 162, 1 (1971).

*Supported by the BMBF under Grant No. 05P21RDCI2.