Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Structure and Dynamics of Nuclei VII

HK 33.1: Group Report

Wednesday, February 28, 2018, 14:00–14:30, HZO 80

High-spin structures of transitional Xe nuclei in the 50 ≤ Z, N ≤ 82 region — •Levent Kaya¹, Andreas Vogt¹, Peter Reiter¹, Marco Siciliano^2,3, Kasia Hadynska-Klek², Carl Wheldon⁴, and J.J. Valiente-Dobón² — ¹IKP, Universität zu Köln — ²INFN - LNL, Italy — ³INFN Padova, Italy — ⁴University of Birmingham, United Kingdom

The 50 ≤ Z, N ≤ 82 region is a fertile testing ground for the predictions of modern shell-model calculations. Xe nuclei with A ≈ 130 form an important link in the smooth evolution from spherical to deformed shapes. Transitional hard-to-reach Xe nuclei are investigated after multinucleon-transfer (MNT) employing the γ-ray tracking array AGATA coupled to the mass spectrometer PRISMA and after MNT employing the GAMMASPHERE spectrometer in combination with the gas-detector array CHICO. Furthermore, Xe isotopes were populated in fusion-evaporation reactions employing the HORUS γ-ray array at the University of Cologne. The high-spin level schemes of ¹³¹Xe, ¹³²Xe and ¹³³Xe are considerably extended to higher energies. Evidence is found for a long-lived (T_1/2 ≫ 1 µs) isomer in ¹³³Xe. A pronounced backbending along the negative-parity band in ¹³¹Xe is observed. Large-scale shell-model calculations employing the SN100PN, PQM130, GCN50:82, and realistic effective interactions reproduce the experimental findings and provide guidance to the interpretation of the observed high-spin features. Supported by the German BMBF (05P12PKFNE TP4, 05P15PKFN9), ENSAR-TNA03, BCGS.