it is isospin - In physics, and specifically, particle physics, isospin (isotopic spin, isobaric spin) is a quantum number
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Peter A. Carruthers has written:
'Spin and isospin in particle physics' -- subject(s): Isobaric
spin, Nuclear spin
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The isospin of the proton (the 1H nucleus) is 1/2; the isospin
of the 2H nucleus is 1.
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An online Encyclopedia such as Wikipedia or Britannica Online
have lengthy articles dedicated to archways including their
construction, physics involved, and uses.
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You can find the acceleration formula on many physics and
mathematical formula websites such as the physicsclassroom website.
Alternatively you can view the formula on the wikipedia
encyclopedia website.