Signatures of triaxiality in low-spin spectra of 86Ge

M. Lettmann; V. Werner; N. Pietralla; P. Doornenbal; A. Obertelli; T.R. Rodríguez; K. Sieja; G. Authelet; H. Baba; D. Calvet; F. Château; S. Chen; A. Corsi; A. Delbart; J.-M. Gheller; A. Giganon; A. Gillibert; V. Lapoux; T. Motobayashi; M. Niikura; N. Paul; J.-Y. Roussé; H. Sakurai; C. Santamaria; D. Steppenbeck; R. Taniuchi; T. Uesaka; T. Ando; T. Arici; A. Blazhev; F. Browne; A. Bruce; R.J. Caroll; L.X. Chung; M.L. Cortés; M. Dewald; B. Ding; F. Flavigny; S. Franchoo; M. Górska; A. Gottardo; A. Jungclaus; J. Lee; B.D. Linh; J. Liu; Z. Liu; C. Lizarazo; S. Momiyama; K. Moschner; S. Nagamine; N. Nakatsuka; C. Nita; C.R. Nobs; L. Olivier; Z. Patel; Zs. Podolyák; M. Rudigier; T. Saito; C. Shand; P.-A. Söderström; I. Stefan; V. Vaquero; K. Wimmer; Z. Xu

doi:10.1088/1742-6596/1023/1/012023

Journal of Physics: Conference Series

Paper • The following article is Open access

Signatures of triaxiality in low-spin spectra of ⁸⁶Ge

M. Lettmann¹, V. Werner¹, N. Pietralla¹, P. Doornenbal², A. Obertelli^3,2,1, T.R. Rodríguez⁴, K. Sieja⁵, G. Authelet³, H. Baba², D. Calvet³, F. Château³, S. Chen^2,6, A. Corsi³, A. Delbart³, J.-M. Gheller³, A. Giganon³, A. Gillibert³, V. Lapoux³, T. Motobayashi², M. Niikura⁷, N. Paul^2,3, J.-Y. Roussé³, H. Sakurai^2,7, C. Santamaria³, D. Steppenbeck², R. Taniuchi^2,7, T. Uesaka², T. Ando^2,7, T. Arici⁸, A. Blazhev⁹, F. Browne¹⁰, A. Bruce¹⁰, R.J. Caroll¹¹, L.X. Chung¹², M.L. Cortés^1,2,8, M. Dewald⁹, B. Ding¹³, F. Flavigny¹⁴, S. Franchoo¹⁴, M. Górska⁸, A. Gottardo¹⁴, A. Jungclaus¹⁵, J. Lee¹⁶, B.D. Linh¹², J. Liu¹⁶, Z. Liu¹³, C. Lizarazo^1,8, S. Momiyama^2,7, K. Moschner⁹, S. Nagamine⁷, N. Nakatsuka¹⁷, C. Nita¹⁸, C.R. Nobs¹⁰, L. Olivier¹⁴, Z. Patel¹¹, Zs. Podolyák¹¹, M. Rudigier¹¹, T. Saito⁷, C. Shand¹¹, P.-A. Söderström^1,2,8, I. Stefan¹⁴, V. Vaquero¹⁵, K. Wimmer⁷ and Z. Xu^16,19

Published under licence by IOP Publishing Ltd
Journal of Physics: Conference Series, Volume 1023, XXII International School on Nuclear Physics, Neutron Physics and Applications 10–16 September 2017, Varna, Bulgaria Citation M. Lettmann et al 2018 J. Phys.: Conf. Ser. 1023 012023 DOI 10.1088/1742-6596/1023/1/012023

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mlettmann@ikp.tu-darmstadt.de

Author affiliations

¹ Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany

² RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

³ CEA, Centre de Saclay, IRFU/Service de Physique Nucléaire, 91191 Gif-sur-Yvette, France

⁴ Departamento de Física Teórica, Universidad Autónoma de Madrid, 28049, Spain

⁵ IPHC, CNRS/IN2P3 et Université de Strasbourg, 67037 Strasbourg, France

⁶ State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P.R. China

⁷ Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan

⁸ GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany

⁹ Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany

¹⁰ School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom

¹¹ Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom

¹² Institute for Nuclear Science & Technology, VINATOM, P.O. Box 5T-160, Nghia Do, Hanoi, Vietnam

¹³ Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, P.R. China

¹⁴ Institut de Physique Nucléaire Orsay, IN2P3-CNRS, 91406 Orsay Cedex, France

¹⁵ Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain

¹⁶ Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong

¹⁷ Department of Physics, Faculty of Science, Kyoto University, Kyoto 606-8502, Japan

¹⁸ Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), 077125 Bucharest, Romania

¹⁹ KU Leuven, Instituut voor Kern-en Stralingsfysica, 3001 Leuven, Belgium

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Abstract

Low-spin states of neutron-rich ^84,86,88Ge were measured by in-flight γ-ray spectroscopy at 270 MeV/u at the RIKEN-RIBF facility. The exotic beams have been produced by primary ²³⁸U in-flight fission reactions and impinged on the MINOS device. MINOS combines a 10-cm long LH₂ target with a Time Projection Chamber (TPC) to reconstruct the reaction vertices. The reactions were selected by the BigRIPS and the ZeroDegree spectrometers for the incoming and outgoing channels, respectively. Emitted γ radiation was detected by the NaI-array DALI2. De-excitations from the ${6}_{1}^{+}$ , ${4}_{1,2}^{+}$ , and ${2}_{1,2}^{+}$ states of ^84,86Ge and ${4}_{1}^{+}$ and ${2}_{1,2}^{+}$ states of ⁸⁸Ge were observed. The data are compared to state-of-the-art shell model and beyond-mean-field calculations. Furthermore, a candidate for a ${3}_{1}^{+}$ state of ⁸⁶Ge was identified. This state plays a key role in the discussion of ground-state triaxiality of ⁸⁶Ge, along with other features of the low-energy level scheme. This work was published in [1].

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