Imaging Fluorescence of He*2 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 He*2 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.

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Presenters

  • Xin Wen

    Department of Physics and Astronomy, University of Tennessee, Knoxville

Authors

  • Xin Wen

    Department of Physics and Astronomy, University of Tennessee, Knoxville

  • Shiran Bao

    Florida State University

  • Landen McDonald

    University of Tennessee, Knoxville

  • Josh Pierce

    Oak Ridge National Laboratory

  • Geoffrey L Greene

    Department of Physics and Astronomy, University of Tennessee, Knoxville

  • Morris Lowell Crow

    Oak Ridge National Laboratory

  • Xin (Tony) Tong

    Institute of High Energy Physics, Chinese Academy of Sciences

  • Anthony Mezzacappa

    Department of Physics and Astronomy, University of Tennessee, Knoxville

  • Ryan Glasby

    University of Tennessee, Knoxville

  • Wei Guo

    Florida State University

  • Michael Fitzsimmons

    Oak Ridge National Laboratory, Oak Ridge National Lab