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Exploring Collective Modes in <sup>70</sup>Ge Through Electromagnetic Interactions

ORAL

Abstract

The electromagnetic properties of states in 70Ge were investigated via both multi-step Coulomb excitation at the ATLAS facility, and nuclear resonance florescence (NRF) at TUNL's HIGS facility. In the former experiment, a total of 27 transitional and 6 diagonal matrix elements coupling 11 low-lying states, were extracted from the measured yields and used to calculate reduced transition probabilities and rotational invariant shape parameters, providing enhanced precision and expanding on previous studies. The data were compared within several theoretical frameworks, leading to the interpretation of the 0+1 and 0+2 states being strongly-mixed, coexisting, triaxial configurations. Analysis of the NRF data is ongoing. Gamma rays associated with ground- and intermediate-state decays from excited dipole levels were observed from 2.5 MeV up to Sp = 8.523 MeV, from which spins, parities, and lifetimes can be determined as well as decay branching and mixing ratios. The implications of these results for understanding the complex shape coexistence phenomena, the role of triaxiality, and evolution of shape and collectivity along the Ge isotopic chain will be discussed.

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Presenters

  • Tyler M Kowalewski

    University of North Carolina at Chapel Hill

Authors

  • Tyler M Kowalewski

    University of North Carolina at Chapel Hill

  • Akaa Daniel Ayangeakaa

    University of North Carolina at Chapel Hill

  • Nirupama Sensharma

    Argonne National Laboratory

  • Robert VF Janssens

    University of North Carolina at Chapel Hill, University of North Carolina at Chapel Hill, TUNL

  • Y. M Wang

    East China Normal University

  • Qibo B Chen

    East China Normal University

  • James M Allmond

    Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • Christopher M Campbell

    Lawrence Berkeley National Laboratory

  • Scott R Carmichael

    University of Notre Dame

  • Michael P Carpenter

    Argonne National Laboratory

  • Patrick A Copp

    Los Alamos National Laboratory

  • Chris Cousins

    University of Surrey

  • Matthew J Devlin

    Los Alamos National Laboratory, Los Alamos National Laboratory (LANL)

  • Umesh Garg

    University of Notre Dame

  • Claus M Müller-Gatermann

    Argonne National Laboratory, ANL

  • Timothy J Gray

    University of Tennessee

  • Daryl J Hartley

    US Naval Academy

  • Jacob Heery

    University of Surrey

  • Jack Henderson

    University of Surrey

  • Heshani Jayatissa

    Los Alamos National Laboratory (LANL), Argonne National Laboratory

  • Samantha Rae Johnson

    Triangle Universities Nuclear Laboratory

  • Stanimir Petrov Kisyov

    Lawrence Berkeley National Laboratory

  • Filip G Kondev

    Argonne National Laboratory

  • Torben Lauritsen

    Argonne National Laboratory

  • Soumen Nandi

    Argonne National Laboratory

  • Ruchi Rathod

    University of Notre Dame

  • Walter Reviol

    Argonne National Laboratory

  • M. Rocchini

    INFN, Sezione di Firenze

  • E. Rubino

    National Superconducting Cyclotron Laboratory, Michigan State University, Facility for Rare Isotope Beams, Facility for Rare Isotope Beams, Michigan State University

  • R. Russell

    University of Surrey

  • Antonella Saracino

    University of North Carolina at Chapel Hill, TUNL

  • Dariusz Seweryniak

    Argonne National Laboratory

  • Marco Siciliano

    Argonne National Laboratory

  • C-Y. Wu

    awrence Livermore National Laborator

  • Brody V Beskar

    University of North Carolina at Chapel Hill

  • David Gribble

    University of North Carolina at Chapel Hill

  • Favour E Idoko

    University of North Carolina at Chapel Hill

  • Xavier K James

    UNC-CH

  • Logan A Schaedig

    University of North Carolina at Chapel Hill

  • Sean W Finch

    Duke University

  • Michelle Lee

    University of North Carolina at Chapel Hill