https://phys.org/news/2022-05-special-c ... verse.html
by Bob Yirka , Phys.org
A team of physicists at Lancaster University has developed a camera system that can be used to capture the shadow of a sample of helium-3. In their paper published in the journal Physical Review B, the group describes their camera, their technique for using it and possible uses for the images it captures.
Helium-3 has particular interest for physicists due to its interesting internal structure, which some in the field have described as the "universe in a droplet." One of its properties is that it transitions to a superfluid when chilled to extremely low temperatures. As part of research efforts, physicists have found ways to detect it by using special probes to sense its weak magnetic field. They have found ways to "touch" it by pushing things through samples of it and measuring their impact. They have also discovered that it is possible to hear some of its characteristics using special microphones. In this new effort, the researchers have now developed a way to visualize it with a special camera system.