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Students Build $100 Handheld Muon Detector for Space Particles

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CosmicWatch, a $100 handheld detector built by physicist Spencer Axani, lets students track muons from cosmic rays and could seed a global science network.

Detecting particles that fall to Earth from space has long been the work of costly, room-sized instruments. A palm-sized device created by physicist Spencer Axani challenges that assumption. Built for roughly $100 in parts, the detector began as a student side project and now serves particle-physics research, classroom teaching and experiments carried to the edge of the atmosphere. The University of Delaware laid out its most recent progress in September, following earlier reporting in Physics Today and Symmetry, the magazine run by Fermilab and SLAC, which traced the tool's growth from Axani's time at MIT into a wider effort known as CosmicWatch.

The instrument targets muons, fleeting subatomic particles created when high-energy cosmic rays strike atoms in the upper atmosphere. Each strike sets off a shower of secondary particles, and some of them reach ground level, slipping through walls, stone and living tissue. Muons move at nearly the speed of light, which makes them useful signals of what unfolds when cosmic radiation meets the air above us. They leave no visible trace, so CosmicWatch translates each one's passage into an electrical pulse that can be recorded.

How the $100 build works

CosmicWatch fits in one hand. At its core sits a plastic scintillator paired with a silicon photomultiplier, backed by electronics that read the faint flashes of light a muon produces as it dumps energy inside the detector. The newest model, called v3X, saves each event to a microSD card or sends readings over USB. It also tracks temperature, pressure and acceleration alongside the particle counts.

The low cost matters because standard detectors tend to be bulky and expensive. The original research paper described the unit as a self-contained, portable instrument that students could put together on their own, with a first-time builder finishing in about four hours. Once assembled, a student can gather data and study how muon counts shift with altitude, with shielding placed around the device, or with other surrounding conditions.

From a neutrino problem to a teaching tool

Axani started the work as a graduate student at MIT. His early aim connected to large neutrino experiments, where spotting atmospheric muons helps researchers separate them from the neutrinos they actually want to measure. The effort then took a turn. Rather than adding another pricey machine for a single specialised lab, Axani and his colleagues designed a version cheap enough for students and modest research budgets.

That design became CosmicWatch and has kept advancing. The v3X release adds environmental sensors, better data handling and coincidence features, which let several detectors run together to filter out stray background signals.

Why muons are worth measuring

Muons do more than confirm that cosmic radiation is streaming overhead. Because they carry high energy and pass through matter readily, they open a window on both cosmic-ray behaviour and the makeup of objects on the ground. Measuring them helps scientists examine the particle showers that cosmic rays trigger and work out the traits of whatever set the shower in motion.

The same idea powers muography, a method that forms images by counting how many muons make it through a given object. Its uses span archaeology and geology. Since muons can push through thick material, they help where ordinary imaging cannot reach inside a dense structure.

Reaching altitudes labs cannot

Portability is one of CosmicWatch's strongest features. Detectors like it have already flown on high-altitude balloons, letting researchers watch cosmic-ray activity shift as the payload rises. Independent balloon flights have carried CosmicWatch units past 60,000 feet. The University of Delaware has described a newer flight in which a modified detector climbed to roughly 100,000 feet, where the shifting atmosphere offers a chance to chart how particle rates change with height.

The hardware is also being applied in laboratory research, including experiments hunting rare particles and dark matter. A later version is under study for measuring primary cosmic rays aboard rockets and spacecraft.

The project points toward something larger still: a spread-out network of cheap detectors feeding a shared database, rather than readings drawn from a few select facilities. Such a setup could resemble a citizen-science network, letting students and researchers across regions line up their cosmic-ray data for comparison. The device's value, then, goes beyond cutting the price of detection. Its small footprint lowers the entry barrier to a corner of physics that usually feels out of reach, putting particle detection on an ordinary desk.

CosmicWatch detector, muon detector, Spencer Axani, cosmic rays, citizen science physics, particle detection, MIT physics project, muography

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