resonance

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Related to Unstable particle: muon, electron
See: intonation
References in periodicals archive ?
The source of this radiation is unknown, but according to an analysis by HESS team member Dieter Horns, it could be produced by dark-matter particles annihilating and producing unstable particles that produce high-energy gamma rays as they decay.
And when the film's reality starts crumbling and reforming itself, it's as if the story wasn't recorded on celluloid or video, but with charged, unstable particles.
Neutrons are surprisingly unstable particles, considering that they make up roughly half the mass of all ordinary matter.