First Measurement of Collectivity of Coexisting Shapes Based on Type II Shell Evolution: The Case of ^{96}Zr
C Kremer1, S Aslanidou1, S Bassauer1
1Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
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 2_{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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