Neutron Decay Rate: Calculating Width & Lifetime

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jiaqiqiu
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How do we calculate the decay width or the mean lifetime of neutron/
 

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about 14 minuets and 46 seconds according to Wikipedia
 
Thank you!I mean I know the result,but I don't know how we get it,so I want to know the theoretical method of dealing with this problem!
 
It's in Griffiths.
 

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