from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Nuclear disintegration or transformation caused by absorption of high-energy radiation, as of gamma rays.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any nuclear reaction, especially a nuclear fission, initiated by absorption of high-energy electromagnetic radiation such as a gamma ray
Sorry, no etymologies found.
Fewell discusses this point, and indicates that the reason lies with the greater photodisintegration rate for 62Ni in stellar interiors.