Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Structure and Dynamics of Nuclei VIII

HK 45.3: Vortrag

Donnerstag, 2. April 2020, 14:45–15:00, J-HS E

Lifetime measurements above the N=82 closed neutron shell in 141,142,143La — •Lisa Marie Gerhard1, Arwin Esmaylzadeh1, Felix Dunkel1, Jan Jolie1, Yung-Hee Kim2, Lukas Knafla1, Ulli Koester2, and Jean-Marc Régis11Institut für Kernphysik, Universität zu Köln — 2Insitut Laue-Langevin, Grenoble

Lifetimes of low-lying excited states in 141,142,143La were determined using the fast-timing technique [1]. The experiment was performed at the Institut Laue-Langevin in Grenoble. Its high intensity research reactor is used to produce the nuclei of interest via neutron induced fission of 239Pu. The fission fragments are separated with the Lohengrin spectrometer to select specific isotopes [2]. During this experiment, barium isotopes were used to produce the odd-Z 141,142,143La via β decay. These isotopes lie above the N=82 closed neutron shell where the evolution from nearly spherical to a strongly deformed shape is investigated. Preliminary results will be presented in comparison to theoretical calculations.
[1] J.-M. Régis et al., Nucl. Instrum. Methods Phys. Res. 726C (2013)

[2] P. Armbruster et al., Nucl. Instrum. Methods 139 (1976)

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