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arXiv · 1606.09057

First Measurement of Collectivity of Coexisting Shapes based on Type II Shell Evolution: The Case of $^{96}$Zr

C. Kremer·S. Aslanidou·S. Bassauer·M. Hilcker·A. Krugmann·P. von Neumann-Cosel·T. Otsuka·N. Pietralla·V. Yu. Ponomarev·N. Shimizu·M. Singer·G. Steinhilber·T. Togashi·Y. Tsunoda·V. Werner·M. Zweidinger
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Abstract

Background: Type II shell evolution has recently been identified as a microscopic cause for nuclear shape coexistence. Purpose: Establish a low-lying rotational band in 96-Zr. Methods: High-resolution inelastic electron scattering and a relative analysis of transition strengths are used. Results: The B(E2; 0_1^+ -> 2_2^+) value is measured and electromagnetic decay strengths of the secdond 2^+ state are deduced. Conclusions: Shape coexistence is established for 96-Zr. Type II shell evolution provides a systematic and quantitative mechanism to understand deformation at low excitation energies.

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C. Kremer, S. Aslanidou, S. Bassauer, M. Hilcker, A. Krugmann, P. von Neumann-Cosel, T. Otsuka, N. Pietralla, V. Yu. Ponomarev, N. Shimizu, M. Singer, G. Steinhilber, T. Togashi, Y. Tsunoda, V. Werner, M. Zweidinger. 2016-06-29. First Measurement of Collectivity of Coexisting Shapes based on Type II Shell Evolution: The Case of $^{96}$Zr. https://doi.org/10.1103/physrevlett.117.172503

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