Abstract
Background: The increase of collectivity in the nuclear spectra, with increasing numbers of valence proton and neutron pairs, is a well-known phenomenon, yielding a decreasing and increasing (2)↑, which is the basis of Grodzins product constancy rule.
Purpose: In the = 88 isotones, this product varies sharply with . This breakdown of the product rule in the Ba to Dy region is illustrated and its origin is analyzed.
Method: Empirical data on energy level structure in various forms along with the 2 transition rates, vis-à-vis the level structure and the nature of the = 64 subshell effect, are presented.
Results: The complex nuclear structure of = 88 isotones is highlighted and the genesis of the underlying physics is made more transparent.
Conclusion: Besides the static shape of the nucleus, it involves the dynamics of the nucleus, as reproduced in the dynamic pairing plus quadrupole model.
- Received 3 September 2013
- Revised 15 February 2014
DOI:https://doi.org/10.1103/PhysRevC.89.034321
©2014 American Physical Society