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.

*Supported in part by the US DOE under Grants DE-SC0023010, DE-FG02-97ER41041, and DE-FG02-97ER41033; the NSF; UNC Startup Funds of A. D. Ayangeakaa; the National Natural Science Foundation of China; the National Key R&D Program of China; and the US NNSA.

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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

  • M.P. 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

  • H. 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

  • R Rubino

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

  • Reuben 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

    • Lawrence Livermore National Laboratory
    • 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