Calculate Degree of Forbiddenness: Step-by-Step Example Included

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How do we calculate degree of forbiddenness? Can someone do an example to show me?
 
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Forbiddenness, or rather forbiddance is the state of being forbidden and does not come in degrees - it is an "absolute" like "only". Cheers, Jim
 
Used in nuclear physics "first forbidden", "second forbidden".etc. refers to by how much a selection rule is broken. Usually if the selection rule is delta L=1, then first forbidden means a transition where delta L=2 or 0, and third is where delta L=3.
 
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