A Reduced matrix element for 0_ --> 0+ forbidden beta decay

squareroot
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Hello
Basically i need some help or references on proving that

Working with spherical tensors in a 0_ ---> 0+ forbidden beta decay
Screen Shot 2017-08-09 at 2.57.58 PM.png
could you please give me some hints on how to do this proof?

Thank you
 
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