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unstable particle |
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unstable particle [¦ən′stā·bəl ′pärd·ə·kəl] (particle physics) Any elementary particle that spontaneously decays into other particles. An elementary particle that can decay through the strong interactions, as opposed to a semistable particle; it has a lifetime on the order of 10-23second. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The researchers fired a beam of antiprotons into a liquid-helium target, then used a sodium iodide detector to measure the energy--in the form of unstable particles known as pions--coming out of the target. One intriguing possibility is that making appropriate measurements or observations quicly enough could slow or even stop the spontaneous decay of an unstable particle such as a radioactive isotope. |
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