negative muon

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Noun1.negative muon - an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino
lepton - an elementary particle that participates in weak interactions; has a baryon number of 0
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In [mu] [right arrow] e conversion experiments, a pulsed negative muon beam is formed from the decay of pions produced in proton collisions on fixed target and brought to stop in a layer of thin targets, where muon captures take place.
In the first step, negative muon coming from outside rapidly comes to rest in the fusion chamber and is captured into a stable, though highly excited, bit around a hydrogen molecule forming meso-molecule ion with increased rotational and vibration motions of a very short period of 5 10-18 sec, compared to muonic life time 2,2 10-6 sec.
The trick was to replace the electron in the hydrogen atom with a negative muon, a particle with the same electric charge but more than 200 times heavier and unstable to boot.
When a negative muon replaces an electron in the is orbital of an atom, then this atom is called a 'muonic' atom: [H.sup.+]& is 'muonic hydrogen'.