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HK: Fachverband Physik der Hadronen und Kerne

HK 49: Structure and Dynamics of Nuclei IX

HK 49.6: Vortrag

Donnerstag, 21. März 2019, 15:30–15:45, HS 14

High-spin structures of transitional Xe and Ba nuclei in the 50 ≤ Z, N ≤ 82 region — •L. Kaya¹, A. Vogt¹, P. Reiter¹, M. Siciliano^2,3, and A. Gargano⁴ — ¹IKP, Universität zu Köln — ²INFN - LNL, Italy — ³INFN Padova, Italy — ⁴INFN Napoli, Italy

The 50 ≤ Z, N ≤ 82 region is a fertile testing ground for the predictions of modern shell-model calculations. Xe and Ba nuclei with A ≈ 130 form an important link in the smooth evolution from spherical to deformed shapes. Transitional hard-to-reach Xe and Ba nuclei are investigated after multinucleon-transfer employing the γ-ray tracking array AGATA coupled to the mass spectrometer PRISMA and in several fusion-evaporation reactions employing the HORUS γ-ray array at the University of Cologne. The high-spin level schemes of ¹³³Xe, ¹³⁵Ba and ¹³⁶Ba are considerably extended. The identification of J^π=23/2⁺ isomers in the millisecond range in ¹³³Xe and ¹³⁵Ba closing a gap in the systematics along the N=79 isotones towards the proton subshell-closure at Z=64. Exploiting angular-correlation investigations, the ground-state band in ¹³⁶Ba was found to be interrupted by negative-parity states only a few hundred keV above the J^π= 10⁽⁺⁾ isomer. Large-scale shell-model calculations employing the SN100PN, GCN50:82, and a realistic effective interaction reproduce the experimental findings and provide guidance to the interpretation of the observed high-spin features. Supported by the German BMBF (05P15PKFN9 TP1, 05P18PKFN9 TP1) and ENSAR-TNA03.