Prototype Camera Finally Photographs the Paths of Invisible Ghost Particles

Scientists in Switzerland have developed a prototype camera capable of capturing clear three-dimensional images of neutrinos, particles so elusive they often earn the label ghost particles. Neutrinos come in huge numbers from the sun and other sources throughout space, yet they interact so rarely with ordinary matter that trillions pass through a person every second without any effect

For years, detecting them needed large subterranean containers filled with specific liquids or massive arrays of sensors buried deep in the ground to capture the exceedingly rare occasions when one collides with an atom. That works, but it’s a bit pricey and doesn’t allow scientists to track the particles’ travels very well. However, a team of researchers from ETH Zurich and EPFL has recently developed a new device called PLATON, which is a far easier way of doing things.

The idea is to use a solid block of a special material called a scintillator, which emits tiny flashes of light whenever a particle passes through it, and to that block is attached a specially designed camera with a grid of tiny lenses and a sensor that can pick up individual photons of light, as well as the exact time they hit it.

When a neutrino interacts with the block, it produces a brief burst of energy that is converted into light, and the camera captures the pattern of light flashes from a variety of angles at the same time. The data is then processed by some sophisticated software, which uses timing information and complex pattern recognition to create a comprehensive 3D representation of the particle’s route. Previous detectors would slice the scintillator into thousands of small bits and connect them with fibers to determine where the particles were, but this made them all large, expensive, and completely unworkable. PLATON does all of the heavy lifting with the camera.

In laboratory experiments, the new device performed admirably, reconstructing tracks from electrons emitted by a known radioactive source. Simulations based on genuine neutrino interactions indicated that it could pinpoint sites with an accuracy of roughly a fifth of a millimeter. According to team member Davide Sgalaberna, this simplifies the process of creating particle detectors while also providing a high level of 3D precision.

This technology opens a host of new possibilities for future studies that will enable researchers to investigate neutrinos more efficiently, and it could be valuable in a variety of other areas as well. Medical imaging is another area where accurate readings inside materials are critical. Of course, there is still a lot of work to be done before it can be scaled up to the size required for large science projects, but for now, this prototype looks promising. As technology advances and becomes more accessible, it has the potential to reveal a great deal more about these fundamental particles and how they help form the cosmos.
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