A free neutron outside a nucleus is not stable. It undergoes beta decay at a probability. Over time, the number of free neutrons decreases exponentially at a time constant, which is called the neutron ...
[Marco] has a sodium iodide detector that indicates cosmic radiation by scintillation. The material glows when hit by cosmic rays and, traditionally, a photomultiplier tube detects the photos from the ...
The table-like scintillation detector on the right is among 507 now arrayed across 300 square miles of Utah desert as part of the existing, $25 million Telescope Array cosmic ray observatory operated ...
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