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 5 μm. 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.
| Original language | English |
|---|---|
| Article number | 134502 |
| Journal | Physical Review Letters |
| Volume | 124 |
| Issue number | 13 |
| DOIs | |
| State | Published - Apr 3 2020 |
Funding
We gratefully acknowledge the experimental support of Harish Agrawal of the Neutron Scattering Division Sample Environment group, Peter Jiang, Jason Hodges, Anna Jennings and Yu Zhao of the Neutron Technologies Division at Oak Ridge National Laboratory (ORNL). This work was supported by the Laboratory Directed Research and Development (LDRD) Program of ORNL. ORNL is managed by UT-Battelle, LLC, for the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. The research at ORNL’s High Flux Isotope Reactor was sponsored by the Scientific User Facilities Division, Basic Energy Sciences, U.S. Department of Energy. X W. acknowledges support from the Shull Wollan Center’s graduate student fellowship program. S. B. and W. G. also acknowledge support from the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1644779 and the State of Florida. W. G. acknowledges the support from the U.S. Army Research Office under Contract No. W911NF1910047. The U.S. Government retains, and the publisher, by accepting the article for publication, acknowledges, that the U.S. Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for U.S. Government purposes.