Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 22: Structure and Dynamics of Nuclei III

HK 22.8: Vortrag

Dienstag, 28. März 2017, 16:00–16:15, F 2

Sub-Shell Closure and Shape Coexistence in the transitional ⁹⁸Zr — •W. Witt¹, V. Werner¹, M. Albers², M. P. Carpenter², R. V. F. Janssens², T. Lauritsen², G. Savard², D. Seweryniak², S. Zhu², D. Cline³, A. B. Hayes³, C.-Y. Wu⁴, O. Möller¹, N. Pietralla¹, G. Rainovski⁵, R. Stegmann¹, B. Bucher⁴, H. David², J. Smith², A. D. Ayangeakaa², and C. Hoffman² — ¹IKP, TU Darmstadt, Deutschland — ²ANL, Argonne, USA — ³Univ. of Rochester, USA — ⁴LLNL, Livermore, USA — ⁵Univ. of Sofia, Bulgaria

Sub-shell closures are of special interest for nuclear structure studies. With Z = 40 Zr nuclei show a closed π2p_1/2 sub-shell and allow for interesting insight into nucleon interactions in the Zr isotopic chain [1]. ⁹⁸Zr is subject to coexistence of nuclear shapes between the mostly spherically shaped ⁹⁶Zr and the strongly deformed ¹⁰⁰Zr. The degree of mixing between different configurations is unclear as experimental constraints for model predictions are barely available. To study low-lying transitions in ⁹⁸Zr a Coulomb excitation experiment was conducted at the ATLAS-facility at ANL making use of the GRETINA and CHICO2 arrays for γ- and particle-detection. This talk reports on the firstly determined B(E2; 2₁⁺ → 0₁⁺) value of ⁹⁸Zr and its interpretation.
Supported by the BMBF under the grant 05P15RDFN9 within the collaboration 05P15 NuSTAR R&D.
C. Kremer et al., Phys. Rev. Lett. 117, 172503 (2016)