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Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 22: Structure and Dynamics of Nuclei III

HK 22.6: Talk

Tuesday, March 28, 2017, 15:30–15:45, F 2

Signatures of triaxiality in low-spin spectra of 86Ge — •Marc Lettmann1, Norbert Pietralla1, Volker Werner1, Pieter Doornenbal2, Alexandre Obertelli3, Tomás R. Rodríguez4, and Kamila Sieja5 for the SEASTAR collaboration — 1TU Darmstadt — 2RIKEN — 3CEA Saclay — 4Universidad Autónoma de Madrid — 5Chargé de recherches CNRS Institut Pluridisciplinaire Hubert Curien

Low-spin states of neutron-rich 84,86,88Ge isotopes were measured via in-beam γ-ray spectroscopy after nucleon removal on hydrogen at intermediate energies. The exotic radioactive beams are provided by the RIKEN-RIBF. Based on the spectroscopic information first level schemes of 86,88Ge are derived. The behavior of the 21+, 41+, 22+ level energies and the R4/2 ratio were obtained up to N=56. The data are compared to state of the art shell model and beyond-mean-flied calculations. Triaxial deformation in 86Ge is discussed on the grounds of experimental observations and theoretical predictions. Supported by the BMBF under grant No. 05P15RDFN1 and NuSTAR DA under grant No. 05P12RDFN8

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