Absolute nuclear radii of Ir isotopes determined by EUV spectroscopy of highly charged ions

ORAL

Abstract

High-statistics, precision EUV spectroscopy was implemented in measuring the nuclear radii difference between Os and Ir for determination of the absolute nuclear radius of Ir.  The EBIT facility at NIST produced highly charged ions at a beam energy of about 18 keV.  Flat-field grazing incidence spectrometer with a CCD pixel resolution of about 0.1 eV was used to record the Na-like 3s1/2–3p1/2 D1 line and the Mg-like and 3s­­2 1S0–3s3p-1P1 line of both elements. The energy shifts of the elements’ transitions were measured over several days by cycling the injection of Os, Ir, and Ne into the EBIT. The measured shifts are directly related to the mean square radii through the nuclear Seltzer moment. Calculations were performed by GRASP2K and RMBPT packages.

*Funded by NSF #1806494, NIST #70NANB19H024.

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Presenters

  • Adam T Hosier

    • Clemson University

Authors

  • Adam T Hosier

    • Clemson University

  • Dipti Dipti

    • National Institute of Standards and Technology
    • National Institute of Standards and Technology, Gaithersburg, MD
    • National Institute of Standards and Technology, Gaithersburg, MD 20899
    • NIST

  • Roshani Silwal

    • Appalachian State University, Boone, NC

  • Alain Lapierre

    • National Superconducting Cyclotron Laboratory, East Lansing MI

  • Steven A Blundell

    • CEA Grenoble

  • Samuel Sanders

    • Clemson University

  • Yang Yang

    • Clemson University

  • Paul Szypryt

    • National Institute of Standards and Technology
    • National Institute of Standards and Technology, Boulder, CO
    • National Institute of Standards and Technology, Boulder, CO 80305

  • Joseph Tan

    • National Institute of Standards and Technology
    • National Institute of Standards & Technology
    • National Institute of Standards and Technology, Gaithersburg, MD
    • National Institute of Standards and Technology, Gaithersburg, MD 20899

  • Aung S Naing

    • University of Delaware, National Institute of Standards and Technology
    • University of Delaware, National Institute of Standards & Technology
    • University of Delaware
    • National Institute of Standards and Technology, Gaithersburg, MD
    • National Institute of Standards and Technology, Gaithersburg, MD 20899

  • Joan M Dreiling

    • National Institute of Standards and Technology, Boulder, CO

  • Gerald Gwinner

    • Univ of Manitoba

  • Antonio C Villari

    • Michigan State University

  • Yuri Ralchenko

    • National Institute of Standards and Technology

  • Endre Takacs

    • Clemson University