Answer by Kent for Why do excited states in $^4$He not decay by photon emission?
A good paper to look at is this. It lists and describes all the reactions that you can imagine involving A=4 and thus the 4He system. Fig. 2 on p.16 is interesting. I'm still trying to understand what...
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Why do excited states in $^4$He not decay by photon emission?
Here's a level scheme for the $^4$He nucleus (source; click image to see full size):Notice that all of the confirmed decay modes are by disintegration — emission of a neutron, proton, or deuteron....
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