subatomic particle

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Related to Basic particles: high energy physics

subatomic particle

[¦səb·ə′täm·ik ′pärd·ə·kəl]
(physics)
A particle which is smaller than an atom, namely, an elementary particle or an atomic nucleus.
References in periodicals archive ?
This principle tells us that if there is an intrinsic property that is instantiated in the space occupied by some basic particles of matter, and if the instantiation of this property is not a logical consequence of the properties and relations of these basic particles of matter, then the basic particles of matter coincide with something that is really an intrinsic unity and not merely the aggregate of the basic particles that coincide with it.
So here we have a way of determining when some basic particles jointly coincide with a substance that is intrinsically one thing.
Observations of cosmic rays and experiments with atom smashers, though, disclosed numerous other seemingly basic particles, with weird names like pion, lambda, delta and sigma, threatening to exhaust the Greek alphabet.
According to what physicists call the "standard model" of the universe, particles such as protons and neutrons are themselves made up of even more basic particles called quarks.

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