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Positronium (Ps) is a system consisting of an electron and its anti-particle, a positron, bound together into an exotic atom, specifically an onium.

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Positronium (Ps) is a system consisting of an electron and its anti-particle, a positron, bound together into an exotic atom, specifically an onium.
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https://en.wikipedia.org/wiki/Positronium
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The system is unstable: the two particles annihilate each other to predominantly produce two or three gamma-rays, depending on the relative spin states.
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The system is unstable: the two particles annihilate each other to predominantly produce two or three gamma-rays, depending on the relative spin states.
In modern physics, antimatter is defined as matter which is composed of the antiparticles (or "partners") of the corresponding particles of 'ordinary' matter.
In theory, a particle and its anti-particle (for example, a proton and an antiproton) have the same mass, but opposite electric charge and other differences in quantum numbers. For example, a proton has positive charge while an antiproton has negative ...
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