A new p-type germanium radiation detector could be the first to measure "soft neutrino-nucleus scattering", a mechanism that was originally predicted 30 years ago. Neutrinos are elusive particles that rarely interact with other matter, and are normally only glimpsed in huge detectors. This is not so with the prototype detector made by physicists in the US, which could be small enough to monitor for the illegitimate use of nuclear reactors, such as the removal of weapons-grade radioactive material (arXiv.org/physics/0701012).
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