Imaging Fluorescence of He<sub>2</sub><sup>* </sup>Excimers Created by Neutron Capture in Liquid He II—a New Approach for Turbulent Flow Research

ORAL

Abstract

We show unequivocal evidence for formation of excimers in liquid He II created by ionizing radiation produced through neutron capture. Laser beams induced fluorescence of the excimers. The fluorescence was recorded by a camera at a rate of 55.6 Hz with the ability to determine the location of an event with an uncertainty of 5 microns. The technique enables measurement of turbulence around macroscopic size (liter+) objects or vortex matter in three dimensions under conditions of extreme Reynolds number. Using thermal counterflow techniques we explored excimer flow in cryogenic He.

*Work supported by the Office of Basic Energy Sciences, U.S. Department of Energy, Division of Materials Science and Scientific User Facilities, and ORNL Lab Directed Research and Development, and support from National High Magnetic Field Laboratory, which is supported by the National Science Foundation.

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Presenters

  • Xin Wen

    • University of Tennessee

Authors

  • Xin Wen

    • University of Tennessee

  • Shiran Bao

    • Florida State University

  • Landen McDonald

    • University of Tennessee

  • Josh Pierce

    • Oak Ridge National Laboratory

  • Geoffrey L Greene

    • University of Tennessee

  • Morris Lowell Crow

    • Oak Ridge National Laboratory

  • Xin Tong

    • Institute of High Energy Physics

  • Anthony Mezzacappa

    • Oak Ridge National Laboratory

  • Ryan Glasby

    • University of Tennessee

  • Wei Guo

    • Florida State University

  • Michael Fitzsimmons

    • University of Tennessee, Knoxville
    • University of Tennessee