Meaning of SPIN in English



Amount of angular momentum associated with a subatomic particle or nucleus .

It is measured in multiples of ħ (h-bar), equal to Planck's constant divided by 2π. neutrons , and protons have a spin of 12, for example, while pions and helium nuclei have zero spin. The spin of a complex nucleus is the vector sum of the orbital angular momentum and intrinsic spins of the constituent nucleons. For nuclei of even mass number, the multiple is an integral; for those of odd mass number, it is a half-integer. See also Bose-Einstein statistics , Fermi-Dirac statistics .


[c mediumvioletred] (as used in expressions)

{{link=isotopic spin">isotopic spin

isobaric spin

electron spin resonance

Britannica English dictionary.      Английский словарь Британика.