Angular momentum of the nucleus is denoted by I, that is in general vector sum of the total orbital angular momentum L and Total spin angular momentum S. When I am saying total, it means for all the the nucleons. Here one of the important point is that highest measured angular momentum of the nucleus is 9/2 while in a heavy nucleus you know hundreds of nucleons remains and sum of all in terms of the total angular momentum of the nucleus is so large as compared to this value. How it can be possible does we learn any wrong concept? this point is analyzed at the end of this video by using the concept of the core and remaining nucleons.
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