MURRAY GELL-MANN (b.1929)

1964 – USA

‘Neutrons and protons are made up of particles called quarks. Like electrons, they cannot be subdivided further’

Photograph of MURRAY GELL-MANN ©

MURRAY GELL-MANN

The standard model of particle physics divides all elementary particles into three groups:

six types of leptons
electron, electron neutrino, muon, muon neutrino, tau and tau neutrino
six types of quarks
up, down, charm, strange, top and bottom    and
four types of bosons

   
Ordinary matter is made up of:

protons
each an up-up-down quark triplet
neutrons
each an up-down-down quark triplet    and
electrons

 

Gell-Mann predicted the existence of three quarks; up, down and strange. Other scientists predicted another three. Quarks cannot exist singly.

picture of the Nobel medal - link to nobelprize.org

Link to WIKIPEDIA

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