Abstract
A schematic calculation is given for the splitting of the giant resonance into (two) component peaks, taking into account the large collective energy shift. The observed intensity ratio of about 1:2 between the main peaks of is calculated for the first time by assuming the quadrupole-quadrupole component of effective two-body forces in the nucleus to be enhanced by almost a factor 2 over the value given by a local potential of Yukawa shape. Similar calculations show this assumption to be compatible with the additional salient features of and photodisintegration, such as the "pygmy" resonance. These three nuclei are then simply generalized to serve as typical examples of the closed shell, closed shell minus a few particles, and closed shell plus a few particles. Detailed consideration of highly deformed nuclei by this method looks prohibitively laborious in detail but should generally yield the hydrodynamic intensity ratio of 1:2. The approach emphasizes that the peak splitting for such nuclei is a function of the excited state rather than of the ground state.
- Received 4 August 1961
DOI:https://doi.org/10.1103/PhysRev.129.808
©1963 American Physical Society