In 1955, cooperating with Kurt Alder and Ben Roy Mottelson, Alaga discovered the K-selection rules and intensity rules for beta and gamma transitions in deformed atom nuclei.
2.
Also in 1955 ( the journal " Physical Review " ) and in 1957 ( the journal " Nuclear Physics " ) he discovered asymptotic selection rules for beta and gamma transitions between states of deformed nuclei.
3.
The immobilization of nuclei at both ends of a gamma resonance interaction is required so that no gamma energy is lost to the kinetic energy of recoiling nuclei at either the emitting or absorbing end of a gamma transition.
4.
When this occurs, no gamma energy is lost to the kinetic energy of recoiling nuclei at either the emitting or absorbing end of a gamma transition : emission and absorption occur at the same energy, resulting in strong, resonant absorption.