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Lifetimes of excited states in triaxially deformed 107Tc and 109,111,113Rh

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Abstract.

Lifetimes of excited states in 107Tc, 109Rh, 111Rh, and 113Rh were measured at GANIL using the Recoil-Distance Doppler Shift method. The neutron-rich nuclei were produced in fission reactions in inverse kinematics with a 238U beam impinging on a 9Be target. Fission fragments were identified event-by-event in the ray-tracing spectrometer VAMOS++ and correlated with prompt \(\gamma\) rays observed around the target position with the EXOGAM Ge detector array. Several lifetimes were obtained for states in the positive-parity yrast bands in the four nuclei and compared to triaxial particle-rotor calculations. The results clarify the configuration for the strongest positive-parity band in 107Tc and suggest a gradual increase of triaxial deformation with atomic number Z, reaching almost maximum triaxiality for the neutron-rich Rh nuclei.

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Authors and Affiliations

  1. Department of Physics, University of Oslo, Oslo, Norway

    T. W. Hagen, A. Görgen, E. Sahin & S. Siem

  2. Irfu, CEA, Université Paris-Saclay, F-91191, Gif-sur-Yvette, France

    W. Korten, L. Grente, M. -D. Salsac, B. Bruyneel, C. Louchart, B. Sulignano & Ch. Theisen

  3. Grand Accélérateur National d’Ions Lourds (GANIL), CEA/DRF - CNRS/IN2P3, Bvd Henri Becquerel, 14076, Caen, France

    F. Farget, I. Celikovic, E. Clément, G. de France, O. Delaune, A. Dijon & B. Jacquot

  4. Institut für Kernphysik, Universität zu Köln, Köln, Germany

    T. Braunroth, A. Dewald, M. Hackstein, J. Litzinger & W. Rother

  5. Institute of Nuclear Sciences “Vinca”, University of Belgrade, Belgrade, Serbia

    I. Celikovic

  6. CSNSM, IN2P3, Orsay, France

    J. Ljungvall

  7. Laboratori Nazionali di Legnaro, INFN, Legnaro, Italy

    C. Michelagnoli, D. R. Napoli, E. Sahin & J. J. Valiente-Dobon

  8. Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, Padova, Italy

    F. Recchia

  9. INFN Sezione di Padova, Padova, Italy

    F. Recchia

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  1. T. W. Hagen
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  2. A. Görgen
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  3. W. Korten
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  6. F. Farget
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  7. T. Braunroth
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  8. B. Bruyneel
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  9. I. Celikovic
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  10. E. Clément
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  11. G. de France
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  15. M. Hackstein
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  19. C. Louchart
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  23. W. Rother
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  25. S. Siem
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  28. J. J. Valiente-Dobon
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Correspondence to A. Görgen.

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Communicated by A. Gade

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Hagen, T.W., Görgen, A., Korten, W. et al. Lifetimes of excited states in triaxially deformed 107Tc and 109,111,113Rh. Eur. Phys. J. A 54, 50 (2018). https://doi.org/10.1140/epja/i2018-12482-9

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