Photons Destroy Everything

The scheme for $\beta^{-}$ decays suggests that all $g^{+}$ particles in the nucleus are susceptible to radioactive decay when bombarded with photons of high enough energy.  And that all nuclei with $g^{+}$ particles can decay.  The nucleus collapses with the release of a electron or positron.

The resulting nucleus set up is unstable.

Photons destroy everything except nuclei without $g^{+}$ particles, ie. hydrogen.  So, the only effective sun block is hydrogen.