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".
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Update: June 2012