Let's look at radioactive decays with emission of nucleons from a gravity particles perspective. Much of this is taken from the page https://en.wikipedia.org/wiki/Radioactive_decay.
1. Alpha decay:
An alpha particle (A = 4, Z = 2) emitted from nucleus (A − 4, Z − 2)
A g− particle is ejected from the nucleus by a Pg− photon, which weakens the gravitational hold on the alpha particle. The alpha particle is emitted and the photon recaptured as a g− particle.
2. Proton emission:
A proton ejected from nucleus (A − 1, Z − 1)
A p+, (g−,g+) or (T−,T+) group is ejected from the nucleus.
3. Neutron emission:
A neutron ejected from nucleus (A − 1, Z)
A g− or T+ particle is ejected but the ejecting photon is not recaptured.
4. Double proton emission:
Two protons ejected from nucleus simultaneously (A − 2, Z − 2)
Two p+, (g−,g+) or (T−,T+) groups are ejected from the nucleus.
5. Spontaneous fission:
Nucleus disintegrates into two or more smaller nuclei and other particles
g− particle(s) being ejected results in a weaken negative gravity potential at the nucleus.
6. Cluster decay:
Nucleus emits a specific type of smaller nucleus (A1, Z1) which is larger than an alpha particle. (A − A1, Z − Z1) + (A1, Z1)
g− particle(s) being ejected results in a weaken negative gravity potential at the nucleus.
A photon recapture is key, when the nucleus does not change mass number and with the emission of gamma rays in this mode of radioactive decay.
