Sign up ×
Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free.

In particle physics, when you read $J^P$, does it mean Spin parity or total angular momentum parity?

I know that the letter $J$ is used for TOTAL angular momentum but I think I read somewhere that sometimes it is meant spin when used in this $J^P$ notation.

share|cite|improve this question

1 Answer 1

up vote 2 down vote accepted

The notation always refers to the total angular momentum. A source of confusion may be that in nuclear physics, we talk about the "spin" of a nucleus as a whole, even though the spin is only partly due to the intrinsic spin 1/2 of the neutrons and protons.

share|cite|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.