Shell evolution and E2 collectivity: new spectroscopic information

We report here on the first evidence for shape coexistence caused by Type II Shell Evolution which is firmly based on the measurement of absolute E2 transition rates. The data have been obtained in high-resolution inelastic electron scattering spectroscopy of the nucleus 96 Zr at the Superconducting...

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Bibliographic Details
Published in:Journal of physics. Conference series 2018-02, Vol.966 (1)
Main Authors: Pietralla, N, Kremer, C, Lettmann, M, Aslanidou, S, Krugmann, A, Lizarazo, C, von Neumann-Cosel, P, Werner, V, Witt, W
Format: Article
Language:English
Subjects:
Axial stress
Beams (radiation)
Evolution
Gamma spectroscopy
Inelastic scattering
Isotopes
Physics
Spectrum analysis
Zirconium
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Summary:We report here on the first evidence for shape coexistence caused by Type II Shell Evolution which is firmly based on the measurement of absolute E2 transition rates. The data have been obtained in high-resolution inelastic electron scattering spectroscopy of the nucleus 96 Zr at the Superconducting Darmstadt Linear electron Accelerator (S-DALINAC). The data are presented and discussed. The neutron sub-shell closure at neutron number N = 56 plays a crucial role for the occurence of shape coexistence in 96,98Zr. We have studied the structure of exotic neutron-rich isotopes near the N = 56 neutron sub-shell closure using γ-ray spectroscopy and radioactive beams. We also present and discuss spectroscopic data on 84,86,88Ge taken recently at RIBF, RIKEN. The new data suggest the hitherto unknown existence of a region of pronounced nuclear triaxiality in neutron-rich Ge isotopes.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/966/1/012058