First Measurement of Collectivity of Coexisting Shapes Based on Type II Shell Evolution: The Case of ^{96}Zr.
BACKGROUND
Type II shell evolution has recently been identified as a microscopic cause for nuclear shape coexistence.


OBJECTIVE
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.
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
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Kremer
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
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Aslanidou
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
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Bassauer
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
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Hilcker
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
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Krugmann
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
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von Neumann-Cosel
Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.|Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.|National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.|Instituut voor Kern- en Stralingsfysica, KU Leuven, B-3001 Leuven, Belgium.
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Otsuka
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
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Pietralla
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
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Ponomarev
Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
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Shimizu
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
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Singer
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
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Steinhilber
Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
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Togashi
Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
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Tsunoda
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
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Werner
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
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Zweidinger