München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 54: Poster

HK 54.27: Poster

Thursday, March 21, 2019, 16:30–19:00, Foyer Theresanium

Study of γ -spectroscopy of neutron-rich cerium isotopes after fission — •U. Ahmed¹, P. Koseoglou^1,2, V. Werner¹, N. Pietralla¹, J. Wiederhold¹, M. Thürauf¹, M. Jentschel³, A. Blanc³, G. de France⁴, U. Köster³, S. Leoni⁵, P. Mutti³, G. Simpson⁶, T. Soldner³, C. Ur^7,8, W. Urban^3,9, S. Ilieva¹, R. B. Cakirili¹⁰, J. Jolie¹¹, T. Kröll¹, J.-M. Régis¹¹, and N. Saed-Samii¹¹ — ¹IKP - TU Darmstadt, Germany — ²GSI, Germany — ³ILL, France — ⁴GANIL, France — ⁵Universita di Milano, Italy — ⁶LPSC, Université Grenoble Alpes, France — ⁷Universita di Padova, Italy — ⁸ELI-NP, Romania — ⁹University of Warsaw, Poland — ¹⁰MPIK Heidelberg, Germany — ¹¹IKP Universität zu Köln, Germany

¹⁴⁸Ce and ¹⁵⁰Ce isotopes are located in an area of the nuclear chart known for a quantum shape phase transition from spherical to deformed nuclei [1]. The energies of the band-heads of the β - and γ-vibrations are valuable indicators for the shape of a nucleus.
At the Institute Laue-Langevin, neutron-rich cerium isotopes were produced by cold-neutron induced fission of ²³⁵U. The prompt γ -rays were measured with the EXILL spectrometer [2], comprised of 8 HPGe clover detectors. The data were analysed using γ -spectroscopy coincidence techniques, e.g. including coincidence conditions with fission partners. These techniques were explored and applied to the search for the 0₂⁺-states of ¹⁴⁸Ce and ¹⁵⁰Ce. Supported by BMBF under Grant No. 05P15RDFN1.
R. F. Casten, Nature Physics 2, 811 (2006).
M. Jentschel et al., JINST 12, P11003 (2017).