Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 32: Structure and Dynamics of Nuclei V

HK 32.3: Vortrag

Mittwoch, 29. März 2017, 17:30–17:45, F 33

Multinucleon transfer as a gateway to Z>50, N<82 nuclei — •Andreas Vogt¹, Benedikt Birkenbach¹, Peter Reiter¹, Andrey Blazhev¹, Marco Siciliano^2,3, Kasia Hadyńska-Klek², Carl Wheldon⁴, Eri Teruya⁵, and Naotaka Yoshinaga⁵ — ¹IKP, Universität zu Köln — ²INFN - LNL, Italy — ³INFN Padova, Italy — ⁴University of Birmingham, UK — ⁵Saitama University, Japan

Multinucleon-transfer reactions (MNT) provide access to hard-to-reach nuclei in the vicinity of the Z= 50 and N= 82 shell closures. Nuclei in this region serve as a benchmark for nuclear shell-model calculations based on modern effective interactions. Excited reaction products were measured after MNT in ¹³⁶Xe + ²³⁸U at 1 GeV and ¹³⁶Xe + ²⁰⁸Pb at 930 MeV with the γ-ray tracking array AGATA coupled to the mass spectrometer PRISMA at LNL (INFN, Italy) as well as in the ¹³⁶Xe + ¹⁹⁸Pt MNT reaction employing GAMMASPHERE in combination with the gas-detector array CHICO. Furthermore, Xe and Ba isotopes were populated in fusion-evaporation reactions using the HORUS γ-ray array at the University of Cologne. The high-spin level schemes of ¹³²Xe, ¹³³Xe, ¹³⁴Xe, ¹³⁵Xe and ¹³⁷Ba are considerably extended to higher energies. The 2058-keV (19/2⁻) state in ¹³⁵Xe is identified as an 9.0(9)-ns isomer, closing a gap in the systematics along the N=81 isotones. Latest shell-model calculations reproduce the experimental findings. The experimentally-deduced reduced transition probabilities of the isomeric states are compared to shell-model predictions. Supported by the German BMBF (05P12PKFNE TP4, 05P15PKFN9), ENSAR-TNA03, BCGS.