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Date: Around 1993

What is a half-spin?

In elementary-particle physics there is a term called "fermion". This refers to any particle that has a spin of (1/2)*[h/(2 Pi)] where "h" is Planck's constant. (The term in brackets,[h/(2 Pi)], is often written as an "h" with a line through it, and is referred to as "h-bar"). Electrons, protons, and neutrons are examples of fermions, and one often speaks of them as "spin-1/2 particles".

R.C. Winther

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