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

  • T. W. Hagen
  • A. Görgen
  • W. Korten
  • L. Grente
  • M. -D. Salsac
  • F. Farget
  • T. Braunroth
  • B. Bruyneel
  • I. Celikovic
  • E. Clément
  • G. de France
  • O. Delaune
  • A. Dewald
  • A. Dijon
  • M. Hackstein
  • B. Jacquot
  • J. Litzinger
  • J. Ljungvall
  • C. Louchart
  • C. Michelagnoli
  • D. R. Napoli
  • F. Recchia
  • W. Rother
  • E. Sahin
  • S. Siem
  • B. Sulignano
  • Ch. Theisen
  • J. J. Valiente-Dobon
Regular Article - Experimental Physics
  • 47 Downloads

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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Copyright information

© SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • T. W. Hagen
    • 1
  • A. Görgen
    • 1
  • W. Korten
    • 2
  • L. Grente
    • 2
  • M. -D. Salsac
    • 2
  • F. Farget
    • 3
  • T. Braunroth
    • 4
  • B. Bruyneel
    • 2
  • I. Celikovic
    • 3
    • 5
  • E. Clément
    • 3
  • G. de France
    • 3
  • O. Delaune
    • 3
  • A. Dewald
    • 4
  • A. Dijon
    • 3
  • M. Hackstein
    • 4
  • B. Jacquot
    • 3
  • J. Litzinger
    • 4
  • J. Ljungvall
    • 6
  • C. Louchart
    • 2
  • C. Michelagnoli
    • 7
  • D. R. Napoli
    • 7
  • F. Recchia
    • 8
    • 9
  • W. Rother
    • 4
  • E. Sahin
    • 1
    • 7
  • S. Siem
    • 1
  • B. Sulignano
    • 2
  • Ch. Theisen
    • 2
  • J. J. Valiente-Dobon
    • 7
  1. 1.Department of PhysicsUniversity of OsloOsloNorway
  2. 2.Irfu, CEAUniversité Paris-SaclayGif-sur-YvetteFrance
  3. 3.Grand Accélérateur National d’Ions Lourds (GANIL)CEA/DRF - CNRS/IN2P3CaenFrance
  4. 4.Institut für KernphysikUniversität zu KölnKölnGermany
  5. 5.Institute of Nuclear Sciences “Vinca”University of BelgradeBelgradeSerbia
  6. 6.CSNSM, IN2P3OrsayFrance
  7. 7.Laboratori Nazionali di LegnaroINFNLegnaroItaly
  8. 8.Dipartimento di Fisica e AstronomiaUniversità degli Studi di PadovaPadovaItaly
  9. 9.INFN Sezione di PadovaPadovaItaly

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