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Imaging Fluorescence of He2* Excimers Created by Neutron Capture in Liquid Helium II

X. Wen, S. R. Bao, L. McDonald, J. Pierce, G. L. Greene, Lowell Crow, Xin Tong, A. Mezzacappa, R. Glasby, W. Guo, and M. R. Fitzsimmons
Phys. Rev. Lett. 124, 134502 – Published 1 April 2020
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Abstract

We show unequivocal evidence for formation of He2* excimers in liquid He II created by ionizing radiation produced through neutron capture. Laser beams induce fluorescence of the excimers. The fluorescence is recorded at a rate of 55.6 Hz by a camera. The location of the fluorescence is determined with an uncertainty of 5μm. The technique provides an opportunity to record the flow of He2* excimers in a medium with very small viscosity and enables measurement of turbulence around macroscopic liter size objects or vortex matter in three dimensions.

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  • Received 15 October 2019
  • Accepted 15 December 2019

DOI:https://doi.org/10.1103/PhysRevLett.124.134502

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Fluid DynamicsCondensed Matter, Materials & Applied PhysicsAtomic, Molecular & OpticalInterdisciplinary Physics

Authors & Affiliations

X. Wen1,2,3, S. R. Bao4,5, L. McDonald1,6, J. Pierce2, G. L. Greene1,2, Lowell Crow2, Xin Tong2,7,8, A. Mezzacappa1,2,9, R. Glasby6,9, W. Guo4,5, and M. R. Fitzsimmons1,2,3,*

  • 1Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 2Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
  • 3Shull Wollan Center—A Joint Institute for Neutron Sciences, Oak Ridge, Tennessee 37830, USA
  • 4Mechanical Engineering Department, Florida State University, Tallahassee, Florida 32310, USA
  • 5National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
  • 6Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 7Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, China
  • 8Spallation Neutron Source Science Center, Dongguan 523803, China
  • 9Joint Institute for Computational Sciences, Oak Ridge, Tennessee 37830, USA

  • *Corresponding author. mf3@ornl.gov

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Issue

Vol. 124, Iss. 13 — 3 April 2020

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